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-rw-r--r--layout/base/nsCSSFrameConstructor.cpp11827
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diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * construction of a frame tree that is nearly isomorphic to the content
+ * tree and updating of that tree in response to dynamic changes
+ */
+
+#include "nsCSSFrameConstructor.h"
+
+#include "mozilla/AutoRestore.h"
+#include "mozilla/ComputedStyleInlines.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/ManualNAC.h"
+#include "mozilla/dom/BindContext.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/GeneratedImageContent.h"
+#include "mozilla/dom/HTMLDetailsElement.h"
+#include "mozilla/dom/HTMLSelectElement.h"
+#include "mozilla/dom/HTMLSharedListElement.h"
+#include "mozilla/dom/HTMLSummaryElement.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/Likely.h"
+#include "mozilla/LinkedList.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/PresShellInlines.h"
+#include "mozilla/PrintedSheetFrame.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/ServoBindings.h"
+#include "mozilla/ServoStyleSetInlines.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/StaticPrefs_mathml.h"
+#include "mozilla/Unused.h"
+#include "RetainedDisplayListBuilder.h"
+#include "nsAbsoluteContainingBlock.h"
+#include "nsCSSPseudoElements.h"
+#include "nsAtom.h"
+#include "nsIFrameInlines.h"
+#include "nsGkAtoms.h"
+#include "nsPresContext.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/DocumentInlines.h"
+#include "nsTableFrame.h"
+#include "nsTableColFrame.h"
+#include "nsTableRowFrame.h"
+#include "nsTableCellFrame.h"
+#include "nsHTMLParts.h"
+#include "nsUnicharUtils.h"
+#include "nsViewManager.h"
+#include "nsStyleConsts.h"
+#ifdef MOZ_XUL
+# include "nsXULElement.h"
+#endif // MOZ_XUL
+#include "nsContainerFrame.h"
+#include "nsNameSpaceManager.h"
+#include "nsComboboxControlFrame.h"
+#include "nsListControlFrame.h"
+#include "nsPlaceholderFrame.h"
+#include "nsTableRowGroupFrame.h"
+#include "nsIFormControl.h"
+#include "nsCSSAnonBoxes.h"
+#include "nsTextFragment.h"
+#include "nsIAnonymousContentCreator.h"
+#include "nsContentUtils.h"
+#include "nsIScriptError.h"
+#ifdef XP_MACOSX
+# include "nsIDocShell.h"
+#endif
+#include "ChildIterator.h"
+#include "nsError.h"
+#include "nsLayoutUtils.h"
+#include "nsBoxFrame.h"
+#include "nsBoxLayout.h"
+#include "nsFlexContainerFrame.h"
+#include "nsGridContainerFrame.h"
+#include "RubyUtils.h"
+#include "nsRubyFrame.h"
+#include "nsRubyBaseFrame.h"
+#include "nsRubyBaseContainerFrame.h"
+#include "nsRubyTextFrame.h"
+#include "nsRubyTextContainerFrame.h"
+#include "nsImageFrame.h"
+#include "nsIObjectLoadingContent.h"
+#include "nsTArray.h"
+#include "mozilla/dom/CharacterData.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/ElementInlines.h"
+#include "mozilla/dom/HTMLInputElement.h"
+#include "nsAutoLayoutPhase.h"
+#include "nsStyleStructInlines.h"
+#include "nsPageContentFrame.h"
+#include "mozilla/RestyleManager.h"
+#include "StickyScrollContainer.h"
+#include "nsFieldSetFrame.h"
+#include "nsInlineFrame.h"
+#include "nsBlockFrame.h"
+#include "nsCanvasFrame.h"
+#include "nsFirstLetterFrame.h"
+#include "nsGfxScrollFrame.h"
+#include "nsPageFrame.h"
+#include "nsPageSequenceFrame.h"
+#include "nsTableWrapperFrame.h"
+#include "nsIScrollableFrame.h"
+#include "nsBackdropFrame.h"
+#include "nsTransitionManager.h"
+#include "DetailsFrame.h"
+
+#ifdef MOZ_XUL
+# include "nsIPopupContainer.h"
+#endif
+#ifdef ACCESSIBILITY
+# include "nsAccessibilityService.h"
+#endif
+
+#undef NOISY_FIRST_LETTER
+
+#include "nsMathMLParts.h"
+#include "mozilla/dom/SVGAnimationElement.h"
+#include "mozilla/dom/SVGFilters.h"
+#include "mozilla/dom/SVGTests.h"
+#include "mozilla/SVGGradientFrame.h"
+#include "mozilla/SVGUtils.h"
+
+#include "nsRefreshDriver.h"
+#include "nsTextNode.h"
+#include "ActiveLayerTracker.h"
+
+#ifdef MOZ_GECKO_PROFILER
+# include "mozilla/ProfilerMarkerTypes.h"
+#endif
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+// An alias for convenience.
+static const nsIFrame::ChildListID kPrincipalList = nsIFrame::kPrincipalList;
+
+nsIFrame* NS_NewHTMLCanvasFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewHTMLVideoFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsContainerFrame* NS_NewSVGOuterSVGFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+nsContainerFrame* NS_NewSVGOuterSVGAnonChildFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGInnerSVGFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGGeometryFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGGFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsContainerFrame* NS_NewSVGForeignObjectFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGAFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGSwitchFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGSymbolFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGTextFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGContainerFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGUseFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGViewFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+extern nsIFrame* NS_NewSVGLinearGradientFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+extern nsIFrame* NS_NewSVGRadialGradientFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+extern nsIFrame* NS_NewSVGStopFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+nsContainerFrame* NS_NewSVGMarkerFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+nsContainerFrame* NS_NewSVGMarkerAnonChildFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+extern nsIFrame* NS_NewSVGImageFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGClipPathFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGFilterFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGPatternFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGMaskFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGFEContainerFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGFELeafFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGFEImageFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+nsIFrame* NS_NewSVGFEUnstyledLeafFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+
+#include "mozilla/dom/NodeInfo.h"
+#include "prenv.h"
+#include "nsNodeInfoManager.h"
+#include "nsContentCreatorFunctions.h"
+
+#ifdef DEBUG
+// Set the environment variable GECKO_FRAMECTOR_DEBUG_FLAGS to one or
+// more of the following flags (comma separated) for handy debug
+// output.
+static bool gNoisyContentUpdates = false;
+static bool gReallyNoisyContentUpdates = false;
+static bool gNoisyInlineConstruction = false;
+
+struct FrameCtorDebugFlags {
+ const char* name;
+ bool* on;
+};
+
+static FrameCtorDebugFlags gFlags[] = {
+ {"content-updates", &gNoisyContentUpdates},
+ {"really-noisy-content-updates", &gReallyNoisyContentUpdates},
+ {"noisy-inline", &gNoisyInlineConstruction}};
+
+# define NUM_DEBUG_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
+#endif
+
+#ifdef MOZ_XUL
+# include "nsMenuFrame.h"
+# include "nsPopupSetFrame.h"
+# include "nsTreeColFrame.h"
+# include "nsXULLabelFrame.h"
+
+//------------------------------------------------------------------
+
+nsContainerFrame* NS_NewRootBoxFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+
+nsContainerFrame* NS_NewDocElementBoxFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+
+nsIFrame* NS_NewDeckFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewLeafBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewStackFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewRangeFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewImageBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewTextBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewButtonBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewSplitterFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewMenuPopupFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewPopupSetFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewMenuFrame(PresShell* aPresShell, ComputedStyle* aStyle,
+ uint32_t aFlags);
+
+nsIFrame* NS_NewMenuBarFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewTreeBodyFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewTitleBarFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewResizerFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+#endif
+
+nsHTMLScrollFrame* NS_NewHTMLScrollFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle, bool aIsRoot);
+
+nsXULScrollFrame* NS_NewXULScrollFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle, bool aIsRoot,
+ bool aClipAllDescendants);
+
+nsIFrame* NS_NewSliderFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewScrollbarFrame(PresShell* aPresShell, ComputedStyle* aStyle);
+
+nsIFrame* NS_NewScrollbarButtonFrame(PresShell* aPresShell,
+ ComputedStyle* aStyle);
+
+nsIFrame* NS_NewImageFrameForContentProperty(PresShell*, ComputedStyle*);
+
+nsIFrame* NS_NewImageFrameForGeneratedContentIndex(PresShell*, ComputedStyle*);
+
+// Returns true if aFrame is an anonymous flex/grid item.
+static inline bool IsAnonymousFlexOrGridItem(const nsIFrame* aFrame) {
+ auto pseudoType = aFrame->Style()->GetPseudoType();
+ return pseudoType == PseudoStyleType::anonymousFlexItem ||
+ pseudoType == PseudoStyleType::anonymousGridItem;
+}
+
+// Returns true IFF the given nsIFrame is a nsFlexContainerFrame and
+// represents a -webkit-{inline-}box or -moz-{inline-}box container.
+static inline bool IsFlexContainerForLegacyBox(const nsIFrame* aFrame) {
+ return aFrame->IsFlexContainerFrame() &&
+ aFrame->HasAnyStateBits(NS_STATE_FLEX_IS_EMULATING_LEGACY_BOX);
+}
+
+#if DEBUG
+static void AssertAnonymousFlexOrGridItemParent(const nsIFrame* aChild,
+ const nsIFrame* aParent) {
+ MOZ_ASSERT(IsAnonymousFlexOrGridItem(aChild),
+ "expected an anonymous flex or grid item child frame");
+ MOZ_ASSERT(aParent, "expected a parent frame");
+ auto pseudoType = aChild->Style()->GetPseudoType();
+ if (pseudoType == PseudoStyleType::anonymousFlexItem) {
+ MOZ_ASSERT(aParent->IsFlexContainerFrame(),
+ "anonymous flex items should only exist as children "
+ "of flex container frames");
+ } else {
+ MOZ_ASSERT(aParent->IsGridContainerFrame(),
+ "anonymous grid items should only exist as children "
+ "of grid container frames");
+ }
+}
+#else
+# define AssertAnonymousFlexOrGridItemParent(x, y) PR_BEGIN_MACRO PR_END_MACRO
+#endif
+
+#define FCDATA_DECL(_flags, _func) \
+ { _flags, {(FrameCreationFunc)_func}, nullptr, PseudoStyleType::NotPseudo }
+#define FCDATA_WITH_WRAPPING_BLOCK(_flags, _func, _anon_box) \
+ { \
+ _flags | FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS, \
+ {(FrameCreationFunc)_func}, nullptr, _anon_box \
+ }
+#define SIMPLE_FCDATA(_func) FCDATA_DECL(0, _func)
+#define FULL_CTOR_FCDATA(_flags, _func) \
+ { \
+ _flags | FCDATA_FUNC_IS_FULL_CTOR, {nullptr}, _func, \
+ PseudoStyleType::NotPseudo \
+ }
+
+/**
+ * True if aFrame is an actual inline frame in the sense of non-replaced
+ * display:inline CSS boxes. In other words, it can be affected by {ib}
+ * splitting and can contain first-letter frames. Basically, this is either an
+ * inline frame (positioned or otherwise) or an line frame (this last because
+ * it can contain first-letter and because inserting blocks in the middle of it
+ * needs to terminate it).
+ */
+static bool IsInlineFrame(const nsIFrame* aFrame) {
+ return aFrame->IsFrameOfType(nsIFrame::eLineParticipant);
+}
+
+/**
+ * True for display: contents elements.
+ */
+static inline bool IsDisplayContents(const Element* aElement) {
+ return aElement->IsDisplayContents();
+}
+
+static inline bool IsDisplayContents(const nsIContent* aContent) {
+ return aContent->IsElement() && IsDisplayContents(aContent->AsElement());
+}
+
+/**
+ * True if aFrame is an instance of an SVG frame class or is an inline/block
+ * frame being used for SVG text.
+ */
+static bool IsFrameForSVG(const nsIFrame* aFrame) {
+ return aFrame->IsFrameOfType(nsIFrame::eSVG) ||
+ SVGUtils::IsInSVGTextSubtree(aFrame);
+}
+
+static bool IsLastContinuationForColumnContent(const nsIFrame* aFrame) {
+ MOZ_ASSERT(aFrame);
+ return aFrame->Style()->GetPseudoType() == PseudoStyleType::columnContent &&
+ !aFrame->GetNextContinuation();
+}
+
+/**
+ * Returns true iff aFrame explicitly prevents its descendants from floating
+ * (at least, down to the level of descendants which themselves are
+ * float-containing blocks -- those will manage the floating status of any
+ * lower-level descendents inside them, of course).
+ */
+static bool ShouldSuppressFloatingOfDescendants(nsIFrame* aFrame) {
+ return aFrame->IsFlexOrGridContainer() || aFrame->IsXULBoxFrame() ||
+ aFrame->IsFrameOfType(nsIFrame::eMathML);
+}
+
+// Return true if column-span descendants should be suppressed under aFrame's
+// subtree (until a multi-column container re-establishing a block formatting
+// context). Basically, this is testing whether aFrame establishes a new block
+// formatting context or not.
+static bool ShouldSuppressColumnSpanDescendants(nsIFrame* aFrame) {
+ if (aFrame->Style()->GetPseudoType() == PseudoStyleType::columnContent) {
+ // Never suppress column-span under ::-moz-column-content frames.
+ return false;
+ }
+
+ if (aFrame->IsInlineFrame()) {
+ // Allow inline frames to have column-span block children.
+ return false;
+ }
+
+ if (!aFrame->IsBlockFrameOrSubclass() ||
+ aFrame->HasAnyStateBits(NS_BLOCK_FLOAT_MGR | NS_FRAME_OUT_OF_FLOW)) {
+ // Need to suppress column-span under a different block formatting
+ // context or an out-of-flow frame.
+ //
+ // For example, the children of a column-span never need to be further
+ // processed even if there is a nested column-span child. Because a
+ // column-span always creates its own block formatting context, a nested
+ // column-span child won't be in the same block formatting context with the
+ // nearest multi-column ancestor. This is the same case as if the
+ // column-span is outside of a multi-column hierarchy.
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * If any children require a block parent, return the first such child.
+ * Otherwise return null.
+ */
+static nsIContent* AnyKidsNeedBlockParent(nsIFrame* aFrameList) {
+ for (nsIFrame* k = aFrameList; k; k = k->GetNextSibling()) {
+ // Line participants, such as text and inline frames, can't be
+ // directly inside a XUL box; they must be wrapped in an
+ // intermediate block.
+ if (k->IsFrameOfType(nsIFrame::eLineParticipant)) {
+ return k->GetContent();
+ }
+ }
+ return nullptr;
+}
+
+// Reparent a frame into a wrapper frame that is a child of its old parent.
+static void ReparentFrame(RestyleManager* aRestyleManager,
+ nsContainerFrame* aNewParentFrame, nsIFrame* aFrame,
+ bool aForceStyleReparent) {
+ aFrame->SetParent(aNewParentFrame);
+ // We reparent frames for two reasons: to put them inside ::first-line, and to
+ // put them inside some wrapper anonymous boxes.
+ if (aForceStyleReparent) {
+ aRestyleManager->ReparentComputedStyleForFirstLine(aFrame);
+ }
+}
+
+static void ReparentFrames(nsCSSFrameConstructor* aFrameConstructor,
+ nsContainerFrame* aNewParentFrame,
+ const nsFrameList& aFrameList,
+ bool aForceStyleReparent) {
+ RestyleManager* restyleManager = aFrameConstructor->RestyleManager();
+ for (nsIFrame* f : aFrameList) {
+ ReparentFrame(restyleManager, aNewParentFrame, f, aForceStyleReparent);
+ }
+}
+
+//----------------------------------------------------------------------
+//
+// When inline frames get weird and have block frames in them, we
+// annotate them to help us respond to incremental content changes
+// more easily.
+
+static inline bool IsFramePartOfIBSplit(nsIFrame* aFrame) {
+ bool result = aFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT);
+ MOZ_ASSERT(!result || static_cast<nsBlockFrame*>(do_QueryFrame(aFrame)) ||
+ static_cast<nsInlineFrame*>(do_QueryFrame(aFrame)),
+ "only block/inline frames can have NS_FRAME_PART_OF_IBSPLIT");
+ return result;
+}
+
+static nsContainerFrame* GetIBSplitSibling(nsIFrame* aFrame) {
+ MOZ_ASSERT(IsFramePartOfIBSplit(aFrame), "Shouldn't call this");
+
+ // We only store the "ib-split sibling" annotation with the first
+ // frame in the continuation chain. Walk back to find that frame now.
+ return aFrame->FirstContinuation()->GetProperty(nsIFrame::IBSplitSibling());
+}
+
+static nsContainerFrame* GetIBSplitPrevSibling(nsIFrame* aFrame) {
+ MOZ_ASSERT(IsFramePartOfIBSplit(aFrame), "Shouldn't call this");
+
+ // We only store the ib-split sibling annotation with the first
+ // frame in the continuation chain. Walk back to find that frame now.
+ return aFrame->FirstContinuation()->GetProperty(
+ nsIFrame::IBSplitPrevSibling());
+}
+
+static nsContainerFrame* GetLastIBSplitSibling(nsIFrame* aFrame) {
+ for (nsIFrame *frame = aFrame, *next;; frame = next) {
+ next = GetIBSplitSibling(frame);
+ if (!next) {
+ return static_cast<nsContainerFrame*>(frame);
+ }
+ }
+ MOZ_ASSERT_UNREACHABLE("unreachable code");
+ return nullptr;
+}
+
+static void SetFrameIsIBSplit(nsContainerFrame* aFrame,
+ nsContainerFrame* aIBSplitSibling) {
+ MOZ_ASSERT(aFrame, "bad args!");
+
+ // We should be the only continuation
+ NS_ASSERTION(!aFrame->GetPrevContinuation(),
+ "assigning ib-split sibling to other than first continuation!");
+ NS_ASSERTION(!aFrame->GetNextContinuation() ||
+ IsFramePartOfIBSplit(aFrame->GetNextContinuation()),
+ "should have no non-ib-split continuations here");
+
+ // Mark the frame as ib-split.
+ aFrame->AddStateBits(NS_FRAME_PART_OF_IBSPLIT);
+
+ if (aIBSplitSibling) {
+ NS_ASSERTION(!aIBSplitSibling->GetPrevContinuation(),
+ "assigning something other than the first continuation as the "
+ "ib-split sibling");
+
+ // Store the ib-split sibling (if we were given one) with the
+ // first frame in the flow.
+ aFrame->SetProperty(nsIFrame::IBSplitSibling(), aIBSplitSibling);
+ aIBSplitSibling->SetProperty(nsIFrame::IBSplitPrevSibling(), aFrame);
+ }
+}
+
+static nsIFrame* GetIBContainingBlockFor(nsIFrame* aFrame) {
+ MOZ_ASSERT(
+ IsFramePartOfIBSplit(aFrame),
+ "GetIBContainingBlockFor() should only be called on known IB frames");
+
+ // Get the first "normal" ancestor of the target frame.
+ nsIFrame* parentFrame;
+ do {
+ parentFrame = aFrame->GetParent();
+
+ if (!parentFrame) {
+ NS_ERROR("no unsplit block frame in IB hierarchy");
+ return aFrame;
+ }
+
+ // Note that we ignore non-ib-split frames which have a pseudo on their
+ // ComputedStyle -- they're not the frames we're looking for! In
+ // particular, they may be hiding a real parent that _is_ in an ib-split.
+ if (!IsFramePartOfIBSplit(parentFrame) &&
+ !parentFrame->Style()->IsPseudoOrAnonBox())
+ break;
+
+ aFrame = parentFrame;
+ } while (1);
+
+ // post-conditions
+ NS_ASSERTION(parentFrame,
+ "no normal ancestor found for ib-split frame "
+ "in GetIBContainingBlockFor");
+ NS_ASSERTION(parentFrame != aFrame,
+ "parentFrame is actually the child frame - bogus reslt");
+
+ return parentFrame;
+}
+
+// Find the multicol containing block suitable for reframing.
+//
+// Note: this function may not return a ColumnSetWrapperFrame. For example, if
+// the multicol containing block has "overflow:scroll" style, HTMLScrollFrame is
+// returned because ColumnSetWrapperFrame is the scrolled frame which has the
+// -moz-scrolled-content pseudo style. We may walk up "too far", but in terms of
+// correctness of reframing, it's OK.
+static nsContainerFrame* GetMultiColumnContainingBlockFor(nsIFrame* aFrame) {
+ MOZ_ASSERT(aFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR),
+ "Should only be called if the frame has a multi-column ancestor!");
+
+ nsContainerFrame* current = aFrame->GetParent();
+ while (current &&
+ (current->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) ||
+ current->Style()->IsPseudoOrAnonBox())) {
+ current = current->GetParent();
+ }
+
+ MOZ_ASSERT(current,
+ "No multicol containing block in a valid column hierarchy?");
+
+ return current;
+}
+
+// This is a bit slow, but sometimes we need it.
+static bool ParentIsWrapperAnonBox(nsIFrame* aParent) {
+ nsIFrame* maybeAnonBox = aParent;
+ if (maybeAnonBox->Style()->GetPseudoType() == PseudoStyleType::cellContent) {
+ // The thing that would maybe be a wrapper anon box is the cell.
+ maybeAnonBox = maybeAnonBox->GetParent();
+ }
+ return maybeAnonBox->Style()->IsWrapperAnonBox();
+}
+
+//----------------------------------------------------------------------
+
+// Block/inline frame construction logic. We maintain a few invariants here:
+//
+// 1. Block frames contain block and inline frames.
+//
+// 2. Inline frames only contain inline frames. If an inline parent has a block
+// child then the block child is migrated upward until it lands in a block
+// parent (the inline frames containing block is where it will end up).
+
+inline void SetInitialSingleChild(nsContainerFrame* aParent, nsIFrame* aFrame) {
+ MOZ_ASSERT(!aFrame->GetNextSibling(), "Should be using a frame list");
+ nsFrameList temp(aFrame, aFrame);
+ aParent->SetInitialChildList(kPrincipalList, temp);
+}
+
+// -----------------------------------------------------------
+
+// Structure used when constructing formatting object trees. Contains
+// state information needed for absolutely positioned elements
+namespace mozilla {
+struct AbsoluteFrameList : public nsFrameList {
+ // containing block for absolutely positioned elements
+ nsContainerFrame* containingBlock;
+
+ explicit AbsoluteFrameList(nsContainerFrame* aContainingBlock)
+ : containingBlock(aContainingBlock) {}
+
+#ifdef DEBUG
+ // XXXbz Does this need a debug-only assignment operator that nulls out the
+ // childList in the AbsoluteFrameList we're copying? Introducing a difference
+ // between debug and non-debug behavior seems bad, so I guess not...
+ ~AbsoluteFrameList() {
+ NS_ASSERTION(!FirstChild(),
+ "Dangling child list. Someone forgot to insert it?");
+ }
+#endif
+};
+} // namespace mozilla
+
+// -----------------------------------------------------------
+
+// Structure for saving the existing state when pushing/poping containing
+// blocks. The destructor restores the state to its previous state
+class MOZ_STACK_CLASS nsFrameConstructorSaveState {
+ public:
+ typedef nsIFrame::ChildListID ChildListID;
+ nsFrameConstructorSaveState();
+ ~nsFrameConstructorSaveState();
+
+ private:
+ AbsoluteFrameList* mList; // pointer to struct whose data we save/restore
+ AbsoluteFrameList mSavedList; // copy of original data
+
+ // The name of the child list in which our frames would belong
+ ChildListID mChildListID;
+ nsFrameConstructorState* mState;
+
+ // State used only when we're saving the abs-pos state for a transformed
+ // element.
+ AbsoluteFrameList mSavedFixedList;
+
+ bool mSavedFixedPosIsAbsPos;
+
+ friend class nsFrameConstructorState;
+};
+
+// Structure used for maintaining state information during the
+// frame construction process
+class MOZ_STACK_CLASS nsFrameConstructorState {
+ public:
+ typedef nsIFrame::ChildListID ChildListID;
+
+ nsPresContext* mPresContext;
+ PresShell* mPresShell;
+ nsFrameManager* mFrameManager;
+
+#ifdef MOZ_XUL
+ // Frames destined for the kPopupList.
+ AbsoluteFrameList mPopupList;
+#endif
+
+ // Containing block information for out-of-flow frames.
+ AbsoluteFrameList mFixedList;
+ AbsoluteFrameList mAbsoluteList;
+ AbsoluteFrameList mFloatedList;
+ // The containing block of a frame in the top layer is defined by the
+ // spec: fixed-positioned frames are children of the viewport frame,
+ // and absolutely-positioned frames are children of the initial
+ // containing block. They would not be caught by any other containing
+ // block, e.g. frames with transform or filter.
+ AbsoluteFrameList mTopLayerFixedList;
+ AbsoluteFrameList mTopLayerAbsoluteList;
+
+ nsCOMPtr<nsILayoutHistoryState> mFrameState;
+ // These bits will be added to the state bits of any frame we construct
+ // using this state.
+ nsFrameState mAdditionalStateBits;
+
+ // When working with transform / filter properties, we want to hook the
+ // abs-pos and fixed-pos lists together, since such elements are fixed-pos
+ // containing blocks.
+ //
+ // Similarly when restricting absolute positioning (for e.g. mathml).
+ //
+ // This flag determines whether or not we want to wire the fixed-pos and
+ // abs-pos lists together.
+ bool mFixedPosIsAbsPos;
+
+ // A boolean to indicate whether we have a "pending" popupgroup. That is, we
+ // have already created the FrameConstructionItem for the root popupgroup but
+ // we have not yet created the relevant frame.
+ bool mHavePendingPopupgroup;
+
+ // If false (which is the default) then call SetPrimaryFrame() as needed
+ // during frame construction. If true, don't make any SetPrimaryFrame()
+ // calls, except for generated content which doesn't have a primary frame
+ // yet. The mCreatingExtraFrames == true mode is meant to be used for
+ // construction of random "extra" frames for elements via normal frame
+ // construction APIs (e.g. replication of things across pages in paginated
+ // mode).
+ bool mCreatingExtraFrames;
+
+ nsTArray<RefPtr<nsIContent>> mGeneratedContentWithInitializer;
+
+ // Constructor
+ // Use the passed-in history state.
+ nsFrameConstructorState(
+ PresShell* aPresShell, nsContainerFrame* aFixedContainingBlock,
+ nsContainerFrame* aAbsoluteContainingBlock,
+ nsContainerFrame* aFloatContainingBlock,
+ already_AddRefed<nsILayoutHistoryState> aHistoryState);
+ // Get the history state from the pres context's pres shell.
+ nsFrameConstructorState(PresShell* aPresShell,
+ nsContainerFrame* aFixedContainingBlock,
+ nsContainerFrame* aAbsoluteContainingBlock,
+ nsContainerFrame* aFloatContainingBlock);
+
+ ~nsFrameConstructorState();
+
+ // Process the frame insertions for all the out-of-flow nsAbsoluteItems.
+ void ProcessFrameInsertionsForAllLists();
+
+ // Function to push the existing absolute containing block state and
+ // create a new scope. Code that uses this function should get matching
+ // logic in GetAbsoluteContainingBlock.
+ // Also makes aNewAbsoluteContainingBlock the containing block for
+ // fixed-pos elements if necessary.
+ // aPositionedFrame is the frame whose style actually makes
+ // aNewAbsoluteContainingBlock a containing block. E.g. for a scrollable
+ // element aPositionedFrame is the element's primary frame and
+ // aNewAbsoluteContainingBlock is the scrolled frame.
+ void PushAbsoluteContainingBlock(
+ nsContainerFrame* aNewAbsoluteContainingBlock, nsIFrame* aPositionedFrame,
+ nsFrameConstructorSaveState& aSaveState);
+
+ // Function to push the existing float containing block state and
+ // create a new scope. Code that uses this function should get matching
+ // logic in GetFloatContainingBlock.
+ // Pushing a null float containing block forbids any frames from being
+ // floated until a new float containing block is pushed.
+ // XXX we should get rid of null float containing blocks and teach the
+ // various frame classes to deal with floats instead.
+ void PushFloatContainingBlock(nsContainerFrame* aNewFloatContainingBlock,
+ nsFrameConstructorSaveState& aSaveState);
+
+ // Function to return the proper geometric parent for a frame with display
+ // struct given by aStyleDisplay and parent's frame given by
+ // aContentParentFrame.
+ nsContainerFrame* GetGeometricParent(
+ const nsStyleDisplay& aStyleDisplay,
+ nsContainerFrame* aContentParentFrame) const;
+
+ // Collect absolute frames in mAbsoluteList which are proper descendants
+ // of aNewParent, and reparent them to aNewParent.
+ //
+ // Note: This function does something unusual that moves absolute items
+ // after their frames are constructed under a column hierarchy which has
+ // column-span elements. Do not use this if you're not dealing with
+ // columns.
+ void ReparentAbsoluteItems(nsContainerFrame* aNewParent);
+
+ /**
+ * Function to add a new frame to the right frame list. This MUST be called
+ * on frames before their children have been processed if the frames might
+ * conceivably be out-of-flow; otherwise cleanup in error cases won't work
+ * right. Also, this MUST be called on frames after they have been
+ * initialized.
+ * @param aNewFrame the frame to add
+ * @param aFrameList the list to add in-flow frames to
+ * @param aContent the content pointer for aNewFrame
+ * @param aParentFrame the parent frame for the content if it were in-flow
+ * @param aCanBePositioned pass false if the frame isn't allowed to be
+ * positioned
+ * @param aCanBeFloated pass false if the frame isn't allowed to be
+ * floated
+ * @param aIsOutOfFlowPopup pass true if the frame is an out-of-flow popup
+ * (XUL-only)
+ */
+ void AddChild(nsIFrame* aNewFrame, nsFrameList& aFrameList,
+ nsIContent* aContent, nsContainerFrame* aParentFrame,
+ bool aCanBePositioned = true, bool aCanBeFloated = true,
+ bool aIsOutOfFlowPopup = false, bool aInsertAfter = false,
+ nsIFrame* aInsertAfterFrame = nullptr);
+
+ /**
+ * Function to return the fixed-pos element list. Normally this will just
+ * hand back the fixed-pos element list, but in case we're dealing with a
+ * transformed element that's acting as an abs-pos and fixed-pos container,
+ * we'll hand back the abs-pos list. Callers should use this function if they
+ * want to get the list acting as the fixed-pos item parent.
+ */
+ AbsoluteFrameList& GetFixedList() {
+ return mFixedPosIsAbsPos ? mAbsoluteList : mFixedList;
+ }
+ const AbsoluteFrameList& GetFixedList() const {
+ return mFixedPosIsAbsPos ? mAbsoluteList : mFixedList;
+ }
+
+ protected:
+ friend class nsFrameConstructorSaveState;
+
+ /**
+ * ProcessFrameInsertions takes the frames in aFrameList and adds them as
+ * kids to the aChildListID child list of |aFrameList.containingBlock|.
+ */
+ void ProcessFrameInsertions(AbsoluteFrameList& aFrameList,
+ ChildListID aChildListID);
+
+ /**
+ * GetOutOfFlowFrameList selects the out-of-flow frame list the new
+ * frame should be added to. If the frame shouldn't be added to any
+ * out-of-flow list, it returns nullptr. The corresponding type of
+ * placeholder is also returned via the aPlaceholderType parameter
+ * if this method doesn't return nullptr. The caller should check
+ * whether the returned list really has a containing block.
+ */
+ AbsoluteFrameList* GetOutOfFlowFrameList(nsIFrame* aNewFrame,
+ bool aCanBePositioned,
+ bool aCanBeFloated,
+ bool aIsOutOfFlowPopup,
+ nsFrameState* aPlaceholderType);
+
+ void ConstructBackdropFrameFor(nsIContent* aContent, nsIFrame* aFrame);
+};
+
+nsFrameConstructorState::nsFrameConstructorState(
+ PresShell* aPresShell, nsContainerFrame* aFixedContainingBlock,
+ nsContainerFrame* aAbsoluteContainingBlock,
+ nsContainerFrame* aFloatContainingBlock,
+ already_AddRefed<nsILayoutHistoryState> aHistoryState)
+ : mPresContext(aPresShell->GetPresContext()),
+ mPresShell(aPresShell),
+ mFrameManager(aPresShell->FrameConstructor()),
+#ifdef MOZ_XUL
+ mPopupList(nullptr),
+#endif
+ mFixedList(aFixedContainingBlock),
+ mAbsoluteList(aAbsoluteContainingBlock),
+ mFloatedList(aFloatContainingBlock),
+ mTopLayerFixedList(
+ static_cast<nsContainerFrame*>(mFrameManager->GetRootFrame())),
+ mTopLayerAbsoluteList(
+ aPresShell->FrameConstructor()->GetDocElementContainingBlock()),
+ // See PushAbsoluteContaningBlock below
+ mFrameState(aHistoryState),
+ mAdditionalStateBits(nsFrameState(0)),
+ // If the fixed-pos containing block is equal to the abs-pos containing
+ // block, use the abs-pos containing block's abs-pos list for fixed-pos
+ // frames.
+ mFixedPosIsAbsPos(aFixedContainingBlock == aAbsoluteContainingBlock),
+ mHavePendingPopupgroup(false),
+ mCreatingExtraFrames(false) {
+#ifdef MOZ_XUL
+ nsIPopupContainer* popupContainer =
+ nsIPopupContainer::GetPopupContainer(aPresShell);
+ if (popupContainer) {
+ mPopupList.containingBlock = popupContainer->GetPopupSetFrame();
+ }
+#endif
+ MOZ_COUNT_CTOR(nsFrameConstructorState);
+}
+
+nsFrameConstructorState::nsFrameConstructorState(
+ PresShell* aPresShell, nsContainerFrame* aFixedContainingBlock,
+ nsContainerFrame* aAbsoluteContainingBlock,
+ nsContainerFrame* aFloatContainingBlock)
+ : nsFrameConstructorState(
+ aPresShell, aFixedContainingBlock, aAbsoluteContainingBlock,
+ aFloatContainingBlock,
+ aPresShell->GetDocument()->GetLayoutHistoryState()) {}
+
+nsFrameConstructorState::~nsFrameConstructorState() {
+ MOZ_COUNT_DTOR(nsFrameConstructorState);
+ ProcessFrameInsertionsForAllLists();
+ for (auto& content : Reversed(mGeneratedContentWithInitializer)) {
+ content->RemoveProperty(nsGkAtoms::genConInitializerProperty);
+ }
+}
+
+void nsFrameConstructorState::ProcessFrameInsertionsForAllLists() {
+ ProcessFrameInsertions(mTopLayerFixedList, nsIFrame::kFixedList);
+ ProcessFrameInsertions(mTopLayerAbsoluteList, nsIFrame::kAbsoluteList);
+ ProcessFrameInsertions(mFloatedList, nsIFrame::kFloatList);
+ ProcessFrameInsertions(mAbsoluteList, nsIFrame::kAbsoluteList);
+ ProcessFrameInsertions(mFixedList, nsIFrame::kFixedList);
+#ifdef MOZ_XUL
+ ProcessFrameInsertions(mPopupList, nsIFrame::kPopupList);
+#endif
+}
+
+void nsFrameConstructorState::PushAbsoluteContainingBlock(
+ nsContainerFrame* aNewAbsoluteContainingBlock, nsIFrame* aPositionedFrame,
+ nsFrameConstructorSaveState& aSaveState) {
+ MOZ_ASSERT(!!aNewAbsoluteContainingBlock == !!aPositionedFrame,
+ "We should have both or none");
+ aSaveState.mList = &mAbsoluteList;
+ aSaveState.mSavedList = mAbsoluteList;
+ aSaveState.mChildListID = nsIFrame::kAbsoluteList;
+ aSaveState.mState = this;
+ aSaveState.mSavedFixedPosIsAbsPos = mFixedPosIsAbsPos;
+
+ if (mFixedPosIsAbsPos) {
+ // Since we're going to replace mAbsoluteList, we need to save it into
+ // mFixedList now (and save the current value of mFixedList).
+ aSaveState.mSavedFixedList = mFixedList;
+ mFixedList = mAbsoluteList;
+ }
+
+ mAbsoluteList = AbsoluteFrameList(aNewAbsoluteContainingBlock);
+
+ /* See if we're wiring the fixed-pos and abs-pos lists together. This happens
+ * if we're a transformed/filtered/etc element, or if we force a null abspos
+ * containing block (for mathml for example).
+ */
+ mFixedPosIsAbsPos =
+ !aPositionedFrame || aPositionedFrame->IsFixedPosContainingBlock();
+
+ if (aNewAbsoluteContainingBlock) {
+ aNewAbsoluteContainingBlock->MarkAsAbsoluteContainingBlock();
+ }
+}
+
+void nsFrameConstructorState::PushFloatContainingBlock(
+ nsContainerFrame* aNewFloatContainingBlock,
+ nsFrameConstructorSaveState& aSaveState) {
+ MOZ_ASSERT(!aNewFloatContainingBlock ||
+ aNewFloatContainingBlock->IsFloatContainingBlock(),
+ "Please push a real float containing block!");
+ NS_ASSERTION(
+ !aNewFloatContainingBlock ||
+ !ShouldSuppressFloatingOfDescendants(aNewFloatContainingBlock),
+ "We should not push a frame that is supposed to _suppress_ "
+ "floats as a float containing block!");
+ aSaveState.mList = &mFloatedList;
+ aSaveState.mSavedList = mFloatedList;
+ aSaveState.mChildListID = nsIFrame::kFloatList;
+ aSaveState.mState = this;
+ mFloatedList = AbsoluteFrameList(aNewFloatContainingBlock);
+}
+
+nsContainerFrame* nsFrameConstructorState::GetGeometricParent(
+ const nsStyleDisplay& aStyleDisplay,
+ nsContainerFrame* aContentParentFrame) const {
+ // If there is no container for a fixed, absolute, or floating root
+ // frame, we will ignore the positioning. This hack is originally
+ // brought to you by the letter T: tables, since other roots don't
+ // even call into this code. See bug 178855.
+ //
+ // XXX Disabling positioning in this case is a hack. If one was so inclined,
+ // one could support this either by (1) inserting a dummy block between the
+ // table and the canvas or (2) teaching the canvas how to reflow positioned
+ // elements. (1) has the usual problems when multiple frames share the same
+ // content (notice all the special cases in this file dealing with inner
+ // tables and table wrappers which share the same content). (2) requires some
+ // work and possible factoring.
+ //
+ // XXXbz couldn't we just force position to "static" on roots and
+ // float to "none"? That's OK per CSS 2.1, as far as I can tell.
+
+ if (aContentParentFrame &&
+ SVGUtils::IsInSVGTextSubtree(aContentParentFrame)) {
+ return aContentParentFrame;
+ }
+
+ if (aStyleDisplay.IsFloatingStyle() && mFloatedList.containingBlock) {
+ NS_ASSERTION(!aStyleDisplay.IsAbsolutelyPositionedStyle(),
+ "Absolutely positioned _and_ floating?");
+ return mFloatedList.containingBlock;
+ }
+
+ if (aStyleDisplay.mTopLayer != StyleTopLayer::None) {
+ MOZ_ASSERT(aStyleDisplay.mTopLayer == StyleTopLayer::Top,
+ "-moz-top-layer should be either none or top");
+ MOZ_ASSERT(aStyleDisplay.IsAbsolutelyPositionedStyle(),
+ "Top layer items should always be absolutely positioned");
+ if (aStyleDisplay.mPosition == StylePositionProperty::Fixed) {
+ MOZ_ASSERT(mTopLayerFixedList.containingBlock, "No root frame?");
+ return mTopLayerFixedList.containingBlock;
+ }
+ MOZ_ASSERT(aStyleDisplay.mPosition == StylePositionProperty::Absolute);
+ MOZ_ASSERT(mTopLayerAbsoluteList.containingBlock);
+ return mTopLayerAbsoluteList.containingBlock;
+ }
+
+ if (aStyleDisplay.mPosition == StylePositionProperty::Absolute &&
+ mAbsoluteList.containingBlock) {
+ return mAbsoluteList.containingBlock;
+ }
+
+ if (aStyleDisplay.mPosition == StylePositionProperty::Fixed &&
+ GetFixedList().containingBlock) {
+ return GetFixedList().containingBlock;
+ }
+
+ return aContentParentFrame;
+}
+
+void nsFrameConstructorState::ReparentAbsoluteItems(
+ nsContainerFrame* aNewParent) {
+ // Bug 1491727: This function might not conform to the spec. See
+ // https://github.com/w3c/csswg-drafts/issues/1894.
+
+ MOZ_ASSERT(aNewParent->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR),
+ "Restrict the usage under column hierarchy.");
+
+ nsFrameList newAbsoluteItems;
+
+ nsIFrame* current = mAbsoluteList.FirstChild();
+ while (current) {
+ nsIFrame* placeholder = current->GetPlaceholderFrame();
+
+ if (nsLayoutUtils::IsProperAncestorFrame(aNewParent, placeholder)) {
+ nsIFrame* next = current->GetNextSibling();
+ mAbsoluteList.RemoveFrame(current);
+ newAbsoluteItems.AppendFrame(aNewParent, current);
+ current = next;
+ } else {
+ current = current->GetNextSibling();
+ }
+ }
+
+ if (newAbsoluteItems.NotEmpty()) {
+ // ~nsFrameConstructorSaveState() will move newAbsoluteItems to
+ // aNewParent's absolute child list.
+ nsFrameConstructorSaveState absoluteSaveState;
+
+ // It doesn't matter whether aNewParent has position style or not. Caller
+ // won't call us if we can't have absolute children.
+ PushAbsoluteContainingBlock(aNewParent, aNewParent, absoluteSaveState);
+ mAbsoluteList.SetFrames(newAbsoluteItems);
+ }
+}
+
+AbsoluteFrameList* nsFrameConstructorState::GetOutOfFlowFrameList(
+ nsIFrame* aNewFrame, bool aCanBePositioned, bool aCanBeFloated,
+ bool aIsOutOfFlowPopup, nsFrameState* aPlaceholderType) {
+#ifdef MOZ_XUL
+ if (MOZ_UNLIKELY(aIsOutOfFlowPopup)) {
+ MOZ_ASSERT(mPopupList.containingBlock, "Must have a popup set frame!");
+ *aPlaceholderType = PLACEHOLDER_FOR_POPUP;
+ return &mPopupList;
+ }
+#endif // MOZ_XUL
+ if (aCanBeFloated && aNewFrame->IsFloating()) {
+ *aPlaceholderType = PLACEHOLDER_FOR_FLOAT;
+ return &mFloatedList;
+ }
+
+ if (aCanBePositioned) {
+ const nsStyleDisplay* disp = aNewFrame->StyleDisplay();
+ if (disp->mTopLayer != StyleTopLayer::None) {
+ *aPlaceholderType = PLACEHOLDER_FOR_TOPLAYER;
+ if (disp->mPosition == StylePositionProperty::Fixed) {
+ *aPlaceholderType |= PLACEHOLDER_FOR_FIXEDPOS;
+ return &mTopLayerFixedList;
+ }
+ *aPlaceholderType |= PLACEHOLDER_FOR_ABSPOS;
+ return &mTopLayerAbsoluteList;
+ }
+ if (disp->mPosition == StylePositionProperty::Absolute) {
+ *aPlaceholderType = PLACEHOLDER_FOR_ABSPOS;
+ return &mAbsoluteList;
+ }
+ if (disp->mPosition == StylePositionProperty::Fixed) {
+ *aPlaceholderType = PLACEHOLDER_FOR_FIXEDPOS;
+ return &GetFixedList();
+ }
+ }
+ return nullptr;
+}
+
+void nsFrameConstructorState::ConstructBackdropFrameFor(nsIContent* aContent,
+ nsIFrame* aFrame) {
+ MOZ_ASSERT(aFrame->StyleDisplay()->mTopLayer == StyleTopLayer::Top);
+ nsContainerFrame* frame = do_QueryFrame(aFrame);
+ if (!frame) {
+ NS_WARNING("Cannot create backdrop frame for non-container frame");
+ return;
+ }
+
+ RefPtr<ComputedStyle> style =
+ mPresShell->StyleSet()->ResolvePseudoElementStyle(
+ *aContent->AsElement(), PseudoStyleType::backdrop,
+ /* aParentStyle */ nullptr);
+ MOZ_ASSERT(style->StyleDisplay()->mTopLayer == StyleTopLayer::Top);
+ nsContainerFrame* parentFrame =
+ GetGeometricParent(*style->StyleDisplay(), nullptr);
+
+ nsBackdropFrame* backdropFrame =
+ new (mPresShell) nsBackdropFrame(style, mPresShell->GetPresContext());
+ backdropFrame->Init(aContent, parentFrame, nullptr);
+
+ nsFrameState placeholderType;
+ AbsoluteFrameList* frameList =
+ GetOutOfFlowFrameList(backdropFrame, true, true, false, &placeholderType);
+ MOZ_ASSERT(placeholderType & PLACEHOLDER_FOR_TOPLAYER);
+
+ nsIFrame* placeholder = nsCSSFrameConstructor::CreatePlaceholderFrameFor(
+ mPresShell, aContent, backdropFrame, frame, nullptr, placeholderType);
+ nsFrameList temp(placeholder, placeholder);
+ frame->SetInitialChildList(nsIFrame::kBackdropList, temp);
+
+ frameList->AppendFrame(nullptr, backdropFrame);
+}
+
+void nsFrameConstructorState::AddChild(
+ nsIFrame* aNewFrame, nsFrameList& aFrameList, nsIContent* aContent,
+ nsContainerFrame* aParentFrame, bool aCanBePositioned, bool aCanBeFloated,
+ bool aIsOutOfFlowPopup, bool aInsertAfter, nsIFrame* aInsertAfterFrame) {
+ MOZ_ASSERT(!aNewFrame->GetNextSibling(), "Shouldn't happen");
+
+ nsFrameState placeholderType;
+ AbsoluteFrameList* outOfFlowFrameList =
+ GetOutOfFlowFrameList(aNewFrame, aCanBePositioned, aCanBeFloated,
+ aIsOutOfFlowPopup, &placeholderType);
+
+ // The comments in GetGeometricParent regarding root table frames
+ // all apply here, unfortunately. Thus, we need to check whether
+ // the returned frame items really has containing block.
+ nsFrameList* frameList;
+ if (outOfFlowFrameList && outOfFlowFrameList->containingBlock) {
+ MOZ_ASSERT(aNewFrame->GetParent() == outOfFlowFrameList->containingBlock,
+ "Parent of the frame is not the containing block?");
+ frameList = outOfFlowFrameList;
+ } else {
+ frameList = &aFrameList;
+ placeholderType = nsFrameState(0);
+ }
+
+ if (placeholderType) {
+ NS_ASSERTION(frameList != &aFrameList,
+ "Putting frame in-flow _and_ want a placeholder?");
+ nsIFrame* placeholderFrame =
+ nsCSSFrameConstructor::CreatePlaceholderFrameFor(
+ mPresShell, aContent, aNewFrame, aParentFrame, nullptr,
+ placeholderType);
+
+ placeholderFrame->AddStateBits(mAdditionalStateBits);
+ // Add the placeholder frame to the flow
+ aFrameList.AppendFrame(nullptr, placeholderFrame);
+
+ if (placeholderType & PLACEHOLDER_FOR_TOPLAYER) {
+ ConstructBackdropFrameFor(aContent, aNewFrame);
+ }
+ }
+#ifdef DEBUG
+ else {
+ NS_ASSERTION(aNewFrame->GetParent() == aParentFrame,
+ "In-flow frame has wrong parent");
+ }
+#endif
+
+ if (aInsertAfter) {
+ frameList->InsertFrame(nullptr, aInsertAfterFrame, aNewFrame);
+ } else {
+ frameList->AppendFrame(nullptr, aNewFrame);
+ }
+}
+
+// Some of this function's callers recurse 1000 levels deep in crashtests. On
+// platforms where stack limits are low, we can't afford to incorporate this
+// function's `AutoTArray`s into its callers' stack frames, so disable inlining.
+MOZ_NEVER_INLINE void nsFrameConstructorState::ProcessFrameInsertions(
+ AbsoluteFrameList& aFrameList, ChildListID aChildListID) {
+#define NS_NONXUL_LIST_TEST \
+ (&aFrameList == &mFloatedList && aChildListID == nsIFrame::kFloatList) || \
+ ((&aFrameList == &mAbsoluteList || \
+ &aFrameList == &mTopLayerAbsoluteList) && \
+ aChildListID == nsIFrame::kAbsoluteList) || \
+ ((&aFrameList == &mFixedList || &aFrameList == &mTopLayerFixedList) && \
+ aChildListID == nsIFrame::kFixedList)
+#ifdef MOZ_XUL
+ MOZ_ASSERT(NS_NONXUL_LIST_TEST || (&aFrameList == &mPopupList &&
+ aChildListID == nsIFrame::kPopupList),
+ "Unexpected aFrameList/aChildListID combination");
+#else
+ MOZ_ASSERT(NS_NONXUL_LIST_TEST,
+ "Unexpected aFrameList/aChildListID combination");
+#endif
+
+ if (aFrameList.IsEmpty()) {
+ return;
+ }
+
+ nsContainerFrame* containingBlock = aFrameList.containingBlock;
+
+ NS_ASSERTION(containingBlock, "Child list without containing block?");
+
+ if (aChildListID == nsIFrame::kFixedList) {
+ // Put this frame on the transformed-frame's abs-pos list instead, if
+ // it has abs-pos children instead of fixed-pos children.
+ aChildListID = containingBlock->GetAbsoluteListID();
+ }
+
+ // Insert the frames hanging out in aItems. We can use SetInitialChildList()
+ // if the containing block hasn't been reflowed yet (so NS_FRAME_FIRST_REFLOW
+ // is set) and doesn't have any frames in the aChildListID child list yet.
+ const nsFrameList& childList = containingBlock->GetChildList(aChildListID);
+ if (childList.IsEmpty() &&
+ containingBlock->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
+ // If we're injecting absolutely positioned frames, inject them on the
+ // absolute containing block
+ if (aChildListID == containingBlock->GetAbsoluteListID()) {
+ containingBlock->GetAbsoluteContainingBlock()->SetInitialChildList(
+ containingBlock, aChildListID, aFrameList);
+ } else {
+ containingBlock->SetInitialChildList(aChildListID, aFrameList);
+ }
+ } else if (aChildListID == nsIFrame::kFixedList ||
+ aChildListID == nsIFrame::kAbsoluteList) {
+ // The order is not important for abs-pos/fixed-pos frame list, just
+ // append the frame items to the list directly.
+ mFrameManager->AppendFrames(containingBlock, aChildListID, aFrameList);
+ } else {
+ // Note that whether the frame construction context is doing an append or
+ // not is not helpful here, since it could be appending to some frame in
+ // the middle of the document, which means we're not necessarily
+ // appending to the children of the containing block.
+ //
+ // We need to make sure the 'append to the end of document' case is fast.
+ // So first test the last child of the containing block
+ nsIFrame* lastChild = childList.LastChild();
+
+ // CompareTreePosition uses placeholder hierarchy for out of flow frames,
+ // so this will make out-of-flows respect the ordering of placeholders,
+ // which is great because it takes care of anonymous content.
+ nsIFrame* firstNewFrame = aFrameList.FirstChild();
+
+ // Cache the ancestor chain so that we can reuse it if needed.
+ AutoTArray<nsIFrame*, 20> firstNewFrameAncestors;
+ nsIFrame* notCommonAncestor = nullptr;
+ if (lastChild) {
+ notCommonAncestor = nsLayoutUtils::FillAncestors(
+ firstNewFrame, containingBlock, &firstNewFrameAncestors);
+ }
+
+ if (!lastChild || nsLayoutUtils::CompareTreePosition(
+ lastChild, firstNewFrame, firstNewFrameAncestors,
+ notCommonAncestor ? containingBlock : nullptr) < 0) {
+ // no lastChild, or lastChild comes before the new children, so just
+ // append
+ mFrameManager->AppendFrames(containingBlock, aChildListID, aFrameList);
+ } else {
+ // Try the other children. First collect them to an array so that a
+ // reasonable fast binary search can be used to find the insertion point.
+ AutoTArray<nsIFrame*, 128> children;
+ for (nsIFrame* f = childList.FirstChild(); f != lastChild;
+ f = f->GetNextSibling()) {
+ children.AppendElement(f);
+ }
+
+ nsIFrame* insertionPoint = nullptr;
+ int32_t imin = 0;
+ int32_t max = children.Length();
+ while (max > imin) {
+ int32_t imid = imin + ((max - imin) / 2);
+ nsIFrame* f = children[imid];
+ int32_t compare = nsLayoutUtils::CompareTreePosition(
+ f, firstNewFrame, firstNewFrameAncestors,
+ notCommonAncestor ? containingBlock : nullptr);
+ if (compare > 0) {
+ // f is after the new frame.
+ max = imid;
+ insertionPoint = imid > 0 ? children[imid - 1] : nullptr;
+ } else if (compare < 0) {
+ // f is before the new frame.
+ imin = imid + 1;
+ insertionPoint = f;
+ } else {
+ // This is for the old behavior. Should be removed once it is
+ // guaranteed that CompareTreePosition can't return 0!
+ // See bug 928645.
+ NS_WARNING("Something odd happening???");
+ insertionPoint = nullptr;
+ for (uint32_t i = 0; i < children.Length(); ++i) {
+ nsIFrame* f = children[i];
+ if (nsLayoutUtils::CompareTreePosition(
+ f, firstNewFrame, firstNewFrameAncestors,
+ notCommonAncestor ? containingBlock : nullptr) > 0) {
+ break;
+ }
+ insertionPoint = f;
+ }
+ break;
+ }
+ }
+ mFrameManager->InsertFrames(containingBlock, aChildListID, insertionPoint,
+ aFrameList);
+ }
+ }
+
+ MOZ_ASSERT(aFrameList.IsEmpty(), "How did that happen?");
+}
+
+nsFrameConstructorSaveState::nsFrameConstructorSaveState()
+ : mList(nullptr),
+ mSavedList(nullptr),
+ mChildListID(kPrincipalList),
+ mState(nullptr),
+ mSavedFixedList(nullptr),
+ mSavedFixedPosIsAbsPos(false) {}
+
+nsFrameConstructorSaveState::~nsFrameConstructorSaveState() {
+ // Restore the state
+ if (mList) {
+ NS_ASSERTION(mState, "Can't have mList set without having a state!");
+ mState->ProcessFrameInsertions(*mList, mChildListID);
+ *mList = mSavedList;
+#ifdef DEBUG
+ // We've transferred the child list, so drop the pointer we held to it.
+ // Note that this only matters for the assert in ~AbsoluteFrameList.
+ mSavedList.Clear();
+#endif
+ if (mList == &mState->mAbsoluteList) {
+ mState->mFixedPosIsAbsPos = mSavedFixedPosIsAbsPos;
+ if (mSavedFixedPosIsAbsPos) {
+ // mAbsoluteList was moved to mFixedList, so move mFixedList back
+ // and repair the old mFixedList now.
+ mState->mAbsoluteList = mState->mFixedList;
+ mState->mFixedList = mSavedFixedList;
+#ifdef DEBUG
+ mSavedFixedList.Clear();
+#endif
+ }
+ }
+ NS_ASSERTION(!mList->LastChild() || !mList->LastChild()->GetNextSibling(),
+ "Something corrupted our list");
+ }
+}
+
+/**
+ * Moves aFrameList from aOldParent to aNewParent. This updates the parent
+ * pointer of the frames in the list, and reparents their views as needed.
+ * nsIFrame::SetParent sets the NS_FRAME_HAS_VIEW bit on aNewParent and its
+ * ancestors as needed. Then it sets the list as the initial child list
+ * on aNewParent, unless aNewParent either already has kids or has been
+ * reflowed; in that case it appends the new frames. Note that this
+ * method differs from ReparentFrames in that it doesn't change the kids'
+ * style.
+ */
+// XXXbz Since this is only used for {ib} splits, could we just copy the view
+// bits from aOldParent to aNewParent and then use the
+// nsFrameList::ApplySetParent? That would still leave us doing two passes
+// over the list, of course; if we really wanted to we could factor out the
+// relevant part of ReparentFrameViewList, I suppose... Or just get rid of
+// views, which would make most of this function go away.
+static void MoveChildrenTo(nsIFrame* aOldParent, nsContainerFrame* aNewParent,
+ nsFrameList& aFrameList) {
+ bool sameGrandParent = aOldParent->GetParent() == aNewParent->GetParent();
+
+ if (aNewParent->HasView() || aOldParent->HasView() || !sameGrandParent) {
+ // Move the frames into the new view
+ nsContainerFrame::ReparentFrameViewList(aFrameList, aOldParent, aNewParent);
+ }
+
+ for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) {
+ e.get()->SetParent(aNewParent);
+ }
+
+ if (aNewParent->PrincipalChildList().IsEmpty() &&
+ aNewParent->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
+ aNewParent->SetInitialChildList(kPrincipalList, aFrameList);
+ } else {
+ aNewParent->AppendFrames(kPrincipalList, aFrameList);
+ }
+}
+
+static bool ShouldCreateImageFrameForContent(const Element& aElement,
+ ComputedStyle& aStyle) {
+ if (aElement.IsRootOfNativeAnonymousSubtree()) {
+ return false;
+ }
+ auto& content = aStyle.StyleContent()->mContent;
+ if (!content.IsItems()) {
+ return false;
+ }
+ Span<const StyleContentItem> items = content.AsItems().AsSpan();
+ return items.Length() == 1 && items[0].IsUrl();
+}
+
+//----------------------------------------------------------------------
+
+nsCSSFrameConstructor::nsCSSFrameConstructor(Document* aDocument,
+ PresShell* aPresShell)
+ : nsFrameManager(aPresShell),
+ mDocument(aDocument),
+ mRootElementFrame(nullptr),
+ mRootElementStyleFrame(nullptr),
+ mDocElementContainingBlock(nullptr),
+ mPageSequenceFrame(nullptr),
+ mFirstFreeFCItem(nullptr),
+ mFCItemsInUse(0),
+ mCurrentDepth(0),
+ mQuotesDirty(false),
+ mCountersDirty(false),
+ mIsDestroyingFrameTree(false),
+ mHasRootAbsPosContainingBlock(false),
+ mAlwaysCreateFramesForIgnorableWhitespace(false) {
+#ifdef DEBUG
+ static bool gFirstTime = true;
+ if (gFirstTime) {
+ gFirstTime = false;
+ char* flags = PR_GetEnv("GECKO_FRAMECTOR_DEBUG_FLAGS");
+ if (flags) {
+ bool error = false;
+ for (;;) {
+ char* comma = PL_strchr(flags, ',');
+ if (comma) *comma = '\0';
+
+ bool found = false;
+ FrameCtorDebugFlags* flag = gFlags;
+ FrameCtorDebugFlags* limit = gFlags + NUM_DEBUG_FLAGS;
+ while (flag < limit) {
+ if (PL_strcasecmp(flag->name, flags) == 0) {
+ *(flag->on) = true;
+ printf("nsCSSFrameConstructor: setting %s debug flag on\n",
+ flag->name);
+ found = true;
+ break;
+ }
+ ++flag;
+ }
+
+ if (!found) error = true;
+
+ if (!comma) break;
+
+ *comma = ',';
+ flags = comma + 1;
+ }
+
+ if (error) {
+ printf("Here are the available GECKO_FRAMECTOR_DEBUG_FLAGS:\n");
+ FrameCtorDebugFlags* flag = gFlags;
+ FrameCtorDebugFlags* limit = gFlags + NUM_DEBUG_FLAGS;
+ while (flag < limit) {
+ printf(" %s\n", flag->name);
+ ++flag;
+ }
+ printf(
+ "Note: GECKO_FRAMECTOR_DEBUG_FLAGS is a comma separated list of "
+ "flag\n");
+ printf("names (no whitespace)\n");
+ }
+ }
+ }
+#endif
+}
+
+void nsCSSFrameConstructor::NotifyDestroyingFrame(nsIFrame* aFrame) {
+ if (aFrame->HasAnyStateBits(NS_FRAME_GENERATED_CONTENT)) {
+ if (mQuoteList.DestroyNodesFor(aFrame)) QuotesDirty();
+ }
+
+ if (aFrame->HasAnyStateBits(NS_FRAME_HAS_CSS_COUNTER_STYLE) &&
+ mCounterManager.DestroyNodesFor(aFrame)) {
+ // Technically we don't need to update anything if we destroyed only
+ // USE nodes. However, this is unlikely to happen in the real world
+ // since USE nodes generally go along with INCREMENT nodes.
+ CountersDirty();
+ }
+
+ RestyleManager()->NotifyDestroyingFrame(aFrame);
+}
+
+struct nsGenConInitializer {
+ UniquePtr<nsGenConNode> mNode;
+ nsGenConList* mList;
+ void (nsCSSFrameConstructor::*mDirtyAll)();
+
+ nsGenConInitializer(UniquePtr<nsGenConNode> aNode, nsGenConList* aList,
+ void (nsCSSFrameConstructor::*aDirtyAll)())
+ : mNode(std::move(aNode)), mList(aList), mDirtyAll(aDirtyAll) {}
+};
+
+already_AddRefed<nsIContent> nsCSSFrameConstructor::CreateGenConTextNode(
+ nsFrameConstructorState& aState, const nsString& aString,
+ UniquePtr<nsGenConInitializer> aInitializer) {
+ RefPtr<nsTextNode> content = new (mDocument->NodeInfoManager())
+ nsTextNode(mDocument->NodeInfoManager());
+ content->SetText(aString, false);
+ if (aInitializer) {
+ aInitializer->mNode->mText = content;
+ content->SetProperty(nsGkAtoms::genConInitializerProperty,
+ aInitializer.release(),
+ nsINode::DeleteProperty<nsGenConInitializer>);
+ aState.mGeneratedContentWithInitializer.AppendElement(content);
+ }
+ return content.forget();
+}
+
+already_AddRefed<nsIContent> nsCSSFrameConstructor::CreateGeneratedContent(
+ nsFrameConstructorState& aState, const Element& aOriginatingElement,
+ ComputedStyle& aPseudoStyle, uint32_t aContentIndex) {
+ using Type = StyleContentItem::Tag;
+ // Get the content value
+ const auto& item = aPseudoStyle.StyleContent()->ContentAt(aContentIndex);
+ const Type type = item.tag;
+
+ switch (type) {
+ case Type::Url:
+ return GeneratedImageContent::Create(*mDocument, aContentIndex);
+
+ case Type::String:
+ return CreateGenConTextNode(
+ aState, NS_ConvertUTF8toUTF16(item.AsString().AsString()), nullptr);
+
+ case Type::Attr: {
+ const auto& attr = item.AsAttr();
+ RefPtr<nsAtom> attrName = attr.attribute.AsAtom();
+ int32_t attrNameSpace = kNameSpaceID_None;
+ RefPtr<nsAtom> ns = attr.namespace_url.AsAtom();
+ if (!ns->IsEmpty()) {
+ nsresult rv = nsContentUtils::NameSpaceManager()->RegisterNameSpace(
+ ns.forget(), attrNameSpace);
+ NS_ENSURE_SUCCESS(rv, nullptr);
+ }
+
+ if (mDocument->IsHTMLDocument() && aOriginatingElement.IsHTMLElement()) {
+ ToLowerCaseASCII(attrName);
+ }
+
+ nsCOMPtr<nsIContent> content;
+ NS_NewAttributeContent(mDocument->NodeInfoManager(), attrNameSpace,
+ attrName, getter_AddRefs(content));
+ return content.forget();
+ }
+
+ case Type::Counter:
+ case Type::Counters: {
+ RefPtr<nsAtom> name;
+ CounterStylePtr ptr;
+ nsString separator;
+ if (type == Type::Counter) {
+ auto& counter = item.AsCounter();
+ name = counter._0.AsAtom();
+ ptr = CounterStylePtr::FromStyle(counter._1);
+ } else {
+ auto& counters = item.AsCounters();
+ name = counters._0.AsAtom();
+ CopyUTF8toUTF16(counters._1.AsString(), separator);
+ ptr = CounterStylePtr::FromStyle(counters._2);
+ }
+
+ nsCounterList* counterList = mCounterManager.CounterListFor(name);
+ auto node = MakeUnique<nsCounterUseNode>(
+ std::move(ptr), std::move(separator), aContentIndex,
+ /* aAllCounters = */ type == Type::Counters);
+
+ auto initializer = MakeUnique<nsGenConInitializer>(
+ std::move(node), counterList, &nsCSSFrameConstructor::CountersDirty);
+ return CreateGenConTextNode(aState, u""_ns, std::move(initializer));
+ }
+ case Type::OpenQuote:
+ case Type::CloseQuote:
+ case Type::NoOpenQuote:
+ case Type::NoCloseQuote: {
+ auto node = MakeUnique<nsQuoteNode>(type, aContentIndex);
+ auto initializer = MakeUnique<nsGenConInitializer>(
+ std::move(node), &mQuoteList, &nsCSSFrameConstructor::QuotesDirty);
+ return CreateGenConTextNode(aState, u""_ns, std::move(initializer));
+ }
+
+ case Type::MozAltContent: {
+ // Use the "alt" attribute; if that fails and the node is an HTML
+ // <input>, try the value attribute and then fall back to some default
+ // localized text we have.
+ // XXX what if the 'alt' attribute is added later, how will we
+ // detect that and do the right thing here?
+ if (aOriginatingElement.HasAttr(kNameSpaceID_None, nsGkAtoms::alt)) {
+ nsCOMPtr<nsIContent> content;
+ NS_NewAttributeContent(mDocument->NodeInfoManager(), kNameSpaceID_None,
+ nsGkAtoms::alt, getter_AddRefs(content));
+ return content.forget();
+ }
+
+ if (aOriginatingElement.IsHTMLElement(nsGkAtoms::input)) {
+ if (aOriginatingElement.HasAttr(kNameSpaceID_None, nsGkAtoms::value)) {
+ nsCOMPtr<nsIContent> content;
+ NS_NewAttributeContent(mDocument->NodeInfoManager(),
+ kNameSpaceID_None, nsGkAtoms::value,
+ getter_AddRefs(content));
+ return content.forget();
+ }
+
+ nsAutoString temp;
+ nsContentUtils::GetMaybeLocalizedString(
+ nsContentUtils::eFORMS_PROPERTIES, "Submit", mDocument, temp);
+ return CreateGenConTextNode(aState, temp, nullptr);
+ }
+
+ break;
+ }
+ }
+
+ return nullptr;
+}
+
+/*
+ * aParentFrame - the frame that should be the parent of the generated
+ * content. This is the frame for the corresponding content node,
+ * which must not be a leaf frame.
+ *
+ * Any items created are added to aItems.
+ *
+ * We create an XML element (tag _moz_generated_content_before/after/marker)
+ * representing the pseudoelement. We create a DOM node for each 'content'
+ * item and make those nodes the children of the XML element. Then we create
+ * a frame subtree for the XML element as if it were a regular child of
+ * aParentFrame/aParentContent, giving the XML element the ::before, ::after
+ * or ::marker style.
+ */
+void nsCSSFrameConstructor::CreateGeneratedContentItem(
+ nsFrameConstructorState& aState, nsContainerFrame* aParentFrame,
+ Element& aOriginatingElement, ComputedStyle& aStyle,
+ PseudoStyleType aPseudoElement, FrameConstructionItemList& aItems) {
+ MOZ_ASSERT(aPseudoElement == PseudoStyleType::before ||
+ aPseudoElement == PseudoStyleType::after ||
+ aPseudoElement == PseudoStyleType::marker,
+ "unexpected aPseudoElement");
+
+ if (aParentFrame && (aParentFrame->IsHTMLVideoFrame() ||
+ aParentFrame->IsDateTimeControlFrame())) {
+ // Video frames and date time control frames may not be leafs when backed by
+ // an UA widget, but we still don't want to expose generated content.
+ return;
+ }
+
+ ServoStyleSet* styleSet = mPresShell->StyleSet();
+
+ // Probe for the existence of the pseudo-element
+ RefPtr<ComputedStyle> pseudoStyle = styleSet->ProbePseudoElementStyle(
+ aOriginatingElement, aPseudoElement, &aStyle);
+ if (!pseudoStyle) {
+ return;
+ }
+
+ nsAtom* elemName = nullptr;
+ nsAtom* property = nullptr;
+ switch (aPseudoElement) {
+ case PseudoStyleType::before:
+ elemName = nsGkAtoms::mozgeneratedcontentbefore;
+ property = nsGkAtoms::beforePseudoProperty;
+ break;
+ case PseudoStyleType::after:
+ elemName = nsGkAtoms::mozgeneratedcontentafter;
+ property = nsGkAtoms::afterPseudoProperty;
+ break;
+ case PseudoStyleType::marker:
+ // We want to get a marker style even if we match no rules, but we still
+ // want to check the result of GeneratedContentPseudoExists.
+ elemName = nsGkAtoms::mozgeneratedcontentmarker;
+ property = nsGkAtoms::markerPseudoProperty;
+ break;
+ default:
+ MOZ_ASSERT_UNREACHABLE("unexpected aPseudoElement");
+ }
+
+ // |ProbePseudoStyleFor| checked the 'display' property and the
+ // |ContentCount()| of the 'content' property for us.
+ RefPtr<NodeInfo> nodeInfo = mDocument->NodeInfoManager()->GetNodeInfo(
+ elemName, nullptr, kNameSpaceID_None, nsINode::ELEMENT_NODE);
+ RefPtr<Element> container;
+ nsresult rv = NS_NewXMLElement(getter_AddRefs(container), nodeInfo.forget());
+ if (NS_FAILED(rv)) {
+ return;
+ }
+
+ // Cleared when the pseudo is unbound from the tree, so no need to store a
+ // strong reference, nor a destructor.
+ aOriginatingElement.SetProperty(property, container.get());
+
+ container->SetIsNativeAnonymousRoot();
+ container->SetPseudoElementType(aPseudoElement);
+
+ BindContext context(aOriginatingElement, BindContext::ForNativeAnonymous);
+ rv = container->BindToTree(context, aOriginatingElement);
+ if (NS_FAILED(rv)) {
+ container->UnbindFromTree();
+ return;
+ }
+
+ // Servo has already eagerly computed the style for the container, so we can
+ // just stick the style on the element and avoid an additional traversal.
+ //
+ // We don't do this for pseudos that may trigger animations or transitions,
+ // since those need to be kicked off by the traversal machinery.
+ //
+ // Note that when a pseudo-element animates, we flag the originating element,
+ // so we check that flag, but we could also a more expensive (but exhaustive)
+ // check using EffectSet::GetEffectSet, for example.
+ if (!Servo_ComputedValues_SpecifiesAnimationsOrTransitions(pseudoStyle) &&
+ !aOriginatingElement.MayHaveAnimations()) {
+ Servo_SetExplicitStyle(container, pseudoStyle);
+ } else {
+ // If animations are involved, we avoid the SetExplicitStyle optimization
+ // above. We need to grab style with animations from the pseudo element and
+ // replace old one.
+ mPresShell->StyleSet()->StyleNewSubtree(container);
+ pseudoStyle = ServoStyleSet::ResolveServoStyle(*container);
+ }
+
+ uint32_t contentCount = pseudoStyle->StyleContent()->ContentCount();
+ for (uint32_t contentIndex = 0; contentIndex < contentCount; contentIndex++) {
+ nsCOMPtr<nsIContent> content = CreateGeneratedContent(
+ aState, aOriginatingElement, *pseudoStyle, contentIndex);
+ if (!content) {
+ continue;
+ }
+ // We don't strictly have to set NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE
+ // here; it would get set under AppendChildTo. But AppendChildTo might
+ // think that we're going from not being anonymous to being anonymous and
+ // do some extra work; setting the flag here avoids that.
+ content->SetFlags(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE);
+ container->AppendChildTo(content, false);
+ if (auto* element = Element::FromNode(content)) {
+ // If we created any children elements, Servo needs to traverse them, but
+ // the root is already set up.
+ mPresShell->StyleSet()->StyleNewSubtree(element);
+ }
+ }
+
+ AddFrameConstructionItemsInternal(aState, container, aParentFrame, true,
+ pseudoStyle, {ItemFlag::IsGeneratedContent},
+ aItems);
+}
+
+/****************************************************
+ ** BEGIN TABLE SECTION
+ ****************************************************/
+
+// The term pseudo frame is being used instead of anonymous frame, since
+// anonymous frame has been used elsewhere to refer to frames that have
+// generated content
+
+// Return whether the given frame is a table pseudo-frame. Note that
+// cell-content and table-outer frames have pseudo-types, but are always
+// created, even for non-anonymous cells and tables respectively. So for those
+// we have to examine the cell or table frame to see whether it's a pseudo
+// frame. In particular, a lone table caption will have a table wrapper as its
+// parent, but will also trigger construction of an empty inner table, which
+// will be the one we can examine to see whether the wrapper was a pseudo-frame.
+static bool IsTablePseudo(nsIFrame* aFrame) {
+ auto pseudoType = aFrame->Style()->GetPseudoType();
+ return pseudoType != PseudoStyleType::NotPseudo &&
+ (pseudoType == PseudoStyleType::table ||
+ pseudoType == PseudoStyleType::inlineTable ||
+ pseudoType == PseudoStyleType::tableColGroup ||
+ pseudoType == PseudoStyleType::tableRowGroup ||
+ pseudoType == PseudoStyleType::tableRow ||
+ pseudoType == PseudoStyleType::tableCell ||
+ (pseudoType == PseudoStyleType::cellContent &&
+ aFrame->GetParent()->Style()->GetPseudoType() ==
+ PseudoStyleType::tableCell) ||
+ (pseudoType == PseudoStyleType::tableWrapper &&
+ (aFrame->PrincipalChildList()
+ .FirstChild()
+ ->Style()
+ ->GetPseudoType() == PseudoStyleType::table ||
+ aFrame->PrincipalChildList()
+ .FirstChild()
+ ->Style()
+ ->GetPseudoType() == PseudoStyleType::inlineTable)));
+}
+
+static bool IsRubyPseudo(nsIFrame* aFrame) {
+ return RubyUtils::IsRubyPseudo(aFrame->Style()->GetPseudoType());
+}
+
+static bool IsTableOrRubyPseudo(nsIFrame* aFrame) {
+ return IsTablePseudo(aFrame) || IsRubyPseudo(aFrame);
+}
+
+/* static */
+nsCSSFrameConstructor::ParentType nsCSSFrameConstructor::GetParentType(
+ LayoutFrameType aFrameType) {
+ if (aFrameType == LayoutFrameType::Table) {
+ return eTypeTable;
+ }
+ if (aFrameType == LayoutFrameType::TableRowGroup) {
+ return eTypeRowGroup;
+ }
+ if (aFrameType == LayoutFrameType::TableRow) {
+ return eTypeRow;
+ }
+ if (aFrameType == LayoutFrameType::TableColGroup) {
+ return eTypeColGroup;
+ }
+ if (aFrameType == LayoutFrameType::RubyBaseContainer) {
+ return eTypeRubyBaseContainer;
+ }
+ if (aFrameType == LayoutFrameType::RubyTextContainer) {
+ return eTypeRubyTextContainer;
+ }
+ if (aFrameType == LayoutFrameType::Ruby) {
+ return eTypeRuby;
+ }
+
+ return eTypeBlock;
+}
+
+// Pull all the captions present in aItems out into aCaptions.
+static void PullOutCaptionFrames(nsFrameList& aList, nsFrameList& aCaptions) {
+ nsIFrame* child = aList.FirstChild();
+ while (child) {
+ nsIFrame* nextSibling = child->GetNextSibling();
+ if (child->StyleDisplay()->mDisplay == StyleDisplay::TableCaption) {
+ aList.RemoveFrame(child);
+ aCaptions.AppendFrame(nullptr, child);
+ }
+ child = nextSibling;
+ }
+}
+
+// Construct the outer, inner table frames and the children frames for the
+// table.
+// XXX Page break frames for pseudo table frames are not constructed to avoid
+// the risk associated with revising the pseudo frame mechanism. The long term
+// solution of having frames handle page-break-before/after will solve the
+// problem.
+nsIFrame* nsCSSFrameConstructor::ConstructTable(nsFrameConstructorState& aState,
+ FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame,
+ const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList) {
+ MOZ_ASSERT(aDisplay->mDisplay == StyleDisplay::Table ||
+ aDisplay->mDisplay == StyleDisplay::InlineTable,
+ "Unexpected call");
+
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+ const bool isMathMLContent = content->IsMathMLElement();
+
+ // create the pseudo SC for the table wrapper as a child of the inner SC
+ RefPtr<ComputedStyle> outerComputedStyle;
+ outerComputedStyle =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::tableWrapper, computedStyle);
+
+ // Create the table wrapper frame which holds the caption and inner table
+ // frame
+ nsContainerFrame* newFrame;
+ if (isMathMLContent)
+ newFrame = NS_NewMathMLmtableOuterFrame(mPresShell, outerComputedStyle);
+ else
+ newFrame = NS_NewTableWrapperFrame(mPresShell, outerComputedStyle);
+
+ nsContainerFrame* geometricParent = aState.GetGeometricParent(
+ *outerComputedStyle->StyleDisplay(), aParentFrame);
+
+ // Init the table wrapper frame
+ InitAndRestoreFrame(aState, content, geometricParent, newFrame);
+
+ // Create the inner table frame
+ nsContainerFrame* innerFrame;
+ if (isMathMLContent)
+ innerFrame = NS_NewMathMLmtableFrame(mPresShell, computedStyle);
+ else
+ innerFrame = NS_NewTableFrame(mPresShell, computedStyle);
+
+ InitAndRestoreFrame(aState, content, newFrame, innerFrame);
+ innerFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+
+ // Put the newly created frames into the right child list
+ SetInitialSingleChild(newFrame, innerFrame);
+
+ aState.AddChild(newFrame, aFrameList, content, aParentFrame);
+
+ if (!mRootElementFrame) {
+ // The frame we're constructing will be the root element frame.
+ SetRootElementFrameAndConstructCanvasAnonContent(newFrame, aState,
+ aFrameList);
+ }
+
+ nsFrameList childList;
+
+ // Process children
+ nsFrameConstructorSaveState absoluteSaveState;
+ const nsStyleDisplay* display = outerComputedStyle->StyleDisplay();
+
+ // Mark the table frame as an absolute container if needed
+ newFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ if (display->IsAbsPosContainingBlock(newFrame)) {
+ aState.PushAbsoluteContainingBlock(newFrame, newFrame, absoluteSaveState);
+ }
+ if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) {
+ ConstructFramesFromItemList(
+ aState, aItem.mChildItems, innerFrame,
+ aItem.mFCData->mBits & FCDATA_IS_WRAPPER_ANON_BOX, childList);
+ } else {
+ ProcessChildren(aState, content, computedStyle, innerFrame, true, childList,
+ false);
+ }
+
+ nsFrameList captionList;
+ PullOutCaptionFrames(childList, captionList);
+
+ // Set the inner table frame's initial primary list
+ innerFrame->SetInitialChildList(kPrincipalList, childList);
+
+ // Set the table wrapper frame's secondary childlist lists
+ if (captionList.NotEmpty()) {
+ captionList.ApplySetParent(newFrame);
+ newFrame->SetInitialChildList(nsIFrame::kCaptionList, captionList);
+ }
+
+ return newFrame;
+}
+
+static void MakeTablePartAbsoluteContainingBlockIfNeeded(
+ nsFrameConstructorState& aState, const nsStyleDisplay* aDisplay,
+ nsFrameConstructorSaveState& aAbsSaveState, nsContainerFrame* aFrame) {
+ // If we're positioned, then we need to become an absolute containing block
+ // for any absolutely positioned children and register for post-reflow fixup.
+ //
+ // Note that usually if a frame type can be an absolute containing block, we
+ // always set NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN, whether it actually is or
+ // not. However, in this case flag serves the additional purpose of indicating
+ // that the frame was registered with its table frame. This allows us to avoid
+ // the overhead of unregistering the frame in most cases.
+ if (aDisplay->IsAbsPosContainingBlock(aFrame)) {
+ aFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ aState.PushAbsoluteContainingBlock(aFrame, aFrame, aAbsSaveState);
+ nsTableFrame::RegisterPositionedTablePart(aFrame);
+ }
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructTableRowOrRowGroup(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList) {
+ MOZ_ASSERT(aDisplay->mDisplay == StyleDisplay::TableRow ||
+ aDisplay->mDisplay == StyleDisplay::TableRowGroup ||
+ aDisplay->mDisplay == StyleDisplay::TableFooterGroup ||
+ aDisplay->mDisplay == StyleDisplay::TableHeaderGroup,
+ "Not a row or row group");
+ MOZ_ASSERT(aItem.mComputedStyle->StyleDisplay() == aDisplay,
+ "Display style doesn't match style");
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+
+ nsContainerFrame* newFrame;
+ if (aDisplay->mDisplay == StyleDisplay::TableRow) {
+ if (content->IsMathMLElement())
+ newFrame = NS_NewMathMLmtrFrame(mPresShell, computedStyle);
+ else
+ newFrame = NS_NewTableRowFrame(mPresShell, computedStyle);
+ } else {
+ newFrame = NS_NewTableRowGroupFrame(mPresShell, computedStyle);
+ }
+
+ InitAndRestoreFrame(aState, content, aParentFrame, newFrame);
+
+ nsFrameConstructorSaveState absoluteSaveState;
+ MakeTablePartAbsoluteContainingBlockIfNeeded(aState, aDisplay,
+ absoluteSaveState, newFrame);
+
+ nsFrameList childList;
+ if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) {
+ ConstructFramesFromItemList(
+ aState, aItem.mChildItems, newFrame,
+ aItem.mFCData->mBits & FCDATA_IS_WRAPPER_ANON_BOX, childList);
+ } else {
+ ProcessChildren(aState, content, computedStyle, newFrame, true, childList,
+ false);
+ }
+
+ newFrame->SetInitialChildList(kPrincipalList, childList);
+ aFrameList.AppendFrame(nullptr, newFrame);
+ return newFrame;
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructTableCol(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay,
+ nsFrameList& aFrameList) {
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+
+ nsTableColFrame* colFrame = NS_NewTableColFrame(mPresShell, computedStyle);
+ InitAndRestoreFrame(aState, content, aParentFrame, colFrame);
+
+ NS_ASSERTION(colFrame->Style() == computedStyle, "Unexpected style");
+
+ aFrameList.AppendFrame(nullptr, colFrame);
+
+ // construct additional col frames if the col frame has a span > 1
+ int32_t span = colFrame->GetSpan();
+ for (int32_t spanX = 1; spanX < span; spanX++) {
+ nsTableColFrame* newCol = NS_NewTableColFrame(mPresShell, computedStyle);
+ InitAndRestoreFrame(aState, content, aParentFrame, newCol, false);
+ aFrameList.LastChild()->SetNextContinuation(newCol);
+ newCol->SetPrevContinuation(aFrameList.LastChild());
+ aFrameList.AppendFrame(nullptr, newCol);
+ newCol->SetColType(eColAnonymousCol);
+ }
+
+ return colFrame;
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructTableCell(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList) {
+ MOZ_ASSERT(aDisplay->mDisplay == StyleDisplay::TableCell, "Unexpected call");
+
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+ const bool isMathMLContent = content->IsMathMLElement();
+
+ nsTableFrame* tableFrame =
+ static_cast<nsTableRowFrame*>(aParentFrame)->GetTableFrame();
+ nsContainerFrame* newFrame;
+ // <mtable> is border separate in mathml.css and the MathML code doesn't
+ // implement border collapse. For those users who style <mtable> with border
+ // collapse, give them the default non-MathML table frames that understand
+ // border collapse. This won't break us because MathML table frames are all
+ // subclasses of the default table code, and so we can freely mix <mtable>
+ // with <mtr> or <tr>, <mtd> or <td>. What will happen is just that non-MathML
+ // frames won't understand MathML attributes and will therefore miss the
+ // special handling that the MathML code does.
+ if (isMathMLContent && !tableFrame->IsBorderCollapse()) {
+ newFrame = NS_NewMathMLmtdFrame(mPresShell, computedStyle, tableFrame);
+ } else {
+ // Warning: If you change this and add a wrapper frame around table cell
+ // frames, make sure Bug 368554 doesn't regress!
+ // See IsInAutoWidthTableCellForQuirk() in nsImageFrame.cpp.
+ newFrame = NS_NewTableCellFrame(mPresShell, computedStyle, tableFrame);
+ }
+
+ // Initialize the table cell frame
+ InitAndRestoreFrame(aState, content, aParentFrame, newFrame);
+ newFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+
+ // Resolve pseudo style and initialize the body cell frame
+ RefPtr<ComputedStyle> innerPseudoStyle;
+ innerPseudoStyle = mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::cellContent, computedStyle);
+
+ // Create a block frame that will format the cell's content
+ bool isBlock;
+ nsContainerFrame* cellInnerFrame;
+ if (isMathMLContent) {
+ cellInnerFrame = NS_NewMathMLmtdInnerFrame(mPresShell, innerPseudoStyle);
+ isBlock = false;
+ } else {
+ cellInnerFrame = NS_NewBlockFormattingContext(mPresShell, innerPseudoStyle);
+ isBlock = true;
+ }
+
+ InitAndRestoreFrame(aState, content, newFrame, cellInnerFrame);
+
+ nsFrameConstructorSaveState absoluteSaveState;
+ MakeTablePartAbsoluteContainingBlockIfNeeded(aState, aDisplay,
+ absoluteSaveState, newFrame);
+
+ nsFrameList childList;
+ if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) {
+ // Need to push ourselves as a float containing block.
+ // XXXbz it might be nice to work on getting the parent
+ // FrameConstructionItem down into ProcessChildren and just making use of
+ // the push there, but that's a bit of work.
+ nsFrameConstructorSaveState floatSaveState;
+ if (!isBlock) { /* MathML case */
+ aState.PushFloatContainingBlock(nullptr, floatSaveState);
+ } else {
+ aState.PushFloatContainingBlock(cellInnerFrame, floatSaveState);
+ }
+
+ ConstructFramesFromItemList(
+ aState, aItem.mChildItems, cellInnerFrame,
+ aItem.mFCData->mBits & FCDATA_IS_WRAPPER_ANON_BOX, childList);
+ } else {
+ // Process the child content
+ ProcessChildren(aState, content, computedStyle, cellInnerFrame, true,
+ childList, isBlock);
+ }
+
+ cellInnerFrame->SetInitialChildList(kPrincipalList, childList);
+ SetInitialSingleChild(newFrame, cellInnerFrame);
+ aFrameList.AppendFrame(nullptr, newFrame);
+ return newFrame;
+}
+
+static inline bool NeedFrameFor(const nsFrameConstructorState& aState,
+ nsContainerFrame* aParentFrame,
+ nsIContent* aChildContent) {
+ // XXX the GetContent() != aChildContent check is needed due to bug 135040.
+ // Remove it once that's fixed.
+ MOZ_ASSERT(
+ !aChildContent->GetPrimaryFrame() || aState.mCreatingExtraFrames ||
+ aChildContent->GetPrimaryFrame()->GetContent() != aChildContent,
+ "Why did we get called?");
+
+ // don't create a whitespace frame if aParentFrame doesn't want it.
+ // always create frames for children in generated content. counter(),
+ // quotes, and attr() content can easily change dynamically and we don't
+ // want to be reconstructing frames. It's not even clear that these
+ // should be considered ignorable just because they evaluate to
+ // whitespace.
+
+ // We could handle all this in CreateNeededPseudoContainers or some other
+ // place after we build our frame construction items, but that would involve
+ // creating frame construction items for whitespace kids that ignores
+ // white-space, where we know we'll be dropping them all anyway, and involve
+ // an extra walk down the frame construction item list.
+ auto excludesIgnorableWhitespace = [](nsIFrame* aParentFrame) {
+ return aParentFrame->IsFrameOfType(nsIFrame::eXULBox) ||
+ aParentFrame->IsFrameOfType(nsIFrame::eMathML);
+ };
+ if (!aParentFrame || !excludesIgnorableWhitespace(aParentFrame) ||
+ aParentFrame->IsGeneratedContentFrame() || !aChildContent->IsText()) {
+ return true;
+ }
+
+ aChildContent->SetFlags(NS_CREATE_FRAME_IF_NON_WHITESPACE |
+ NS_REFRAME_IF_WHITESPACE);
+ return !aChildContent->TextIsOnlyWhitespace();
+}
+
+/***********************************************
+ * END TABLE SECTION
+ ***********************************************/
+
+void nsCSSFrameConstructor::SetRootElementFrameAndConstructCanvasAnonContent(
+ nsContainerFrame* aRootElementFrame, nsFrameConstructorState& aState,
+ nsFrameList& aFrameList) {
+ MOZ_DIAGNOSTIC_ASSERT(!mRootElementFrame);
+ mRootElementFrame = aRootElementFrame;
+ if (mDocElementContainingBlock->IsCanvasFrame()) {
+ // NOTE(emilio): This is in the reverse order compared to normal anonymous
+ // children. We usually generate anonymous kids first, then non-anonymous,
+ // but we generate the doc element frame the other way around. This is fine
+ // either way, but generating anonymous children in a different order
+ // requires changing nsCanvasFrame (and a whole lot of other potentially
+ // unknown code) to look at the last child to find the root frame rather
+ // than the first child.
+ ConstructAnonymousContentForCanvas(aState, mDocElementContainingBlock,
+ aRootElementFrame->GetContent(),
+ aFrameList);
+ }
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructDocElementFrame(
+ Element* aDocElement) {
+ MOZ_ASSERT(GetRootFrame(),
+ "No viewport? Someone forgot to call ConstructRootFrame!");
+ MOZ_ASSERT(!mDocElementContainingBlock,
+ "Shouldn't have a doc element containing block here");
+
+ // Resolve a new style for the viewport since it may be affected by a new root
+ // element style (e.g. a propagated 'direction').
+ //
+ // @see ComputedStyle::ApplyStyleFixups
+ {
+ RefPtr<ComputedStyle> sc =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::viewport, nullptr);
+ GetRootFrame()->SetComputedStyleWithoutNotification(sc);
+ }
+
+ // Ensure the document element is styled at this point.
+ if (!aDocElement->HasServoData()) {
+ mPresShell->StyleSet()->StyleNewSubtree(aDocElement);
+ }
+
+ // Make sure to call UpdateViewportScrollStylesOverride before
+ // SetUpDocElementContainingBlock, since it sets up our scrollbar state
+ // properly.
+ DebugOnly<nsIContent*> propagatedScrollFrom;
+ if (nsPresContext* presContext = mPresShell->GetPresContext()) {
+ propagatedScrollFrom = presContext->UpdateViewportScrollStylesOverride();
+ }
+
+ SetUpDocElementContainingBlock(aDocElement);
+
+ // This has the side-effect of getting `mFrameTreeState` from our docshell.
+ //
+ // FIXME(emilio): There may be a more sensible time to do this.
+ if (!mFrameTreeState) {
+ mPresShell->CaptureHistoryState(getter_AddRefs(mFrameTreeState));
+ }
+
+ NS_ASSERTION(mDocElementContainingBlock, "Should have parent by now");
+ nsFrameConstructorState state(
+ mPresShell,
+ GetAbsoluteContainingBlock(mDocElementContainingBlock, FIXED_POS),
+ nullptr, nullptr, do_AddRef(mFrameTreeState));
+
+ RefPtr<ComputedStyle> computedStyle =
+ ServoStyleSet::ResolveServoStyle(*aDocElement);
+
+ const nsStyleDisplay* display = computedStyle->StyleDisplay();
+
+ // --------- IF SCROLLABLE WRAP IN SCROLLFRAME --------
+
+ NS_ASSERTION(!display->IsScrollableOverflow() ||
+ state.mPresContext->IsPaginated() ||
+ propagatedScrollFrom == aDocElement,
+ "Scrollbars should have been propagated to the viewport");
+
+ if (MOZ_UNLIKELY(display->mDisplay == StyleDisplay::None)) {
+ return nullptr;
+ }
+
+ if (mDocElementContainingBlock->IsCanvasFrame()) {
+ // This implements "The Principal Writing Mode".
+ // https://drafts.csswg.org/css-writing-modes-3/#principal-flow
+ //
+ // If there's a <body> element in an HTML document, its writing-mode,
+ // direction, and text-orientation override the root element's used value.
+ //
+ // We need to copy <body>'s WritingMode to mDocElementContainingBlock before
+ // construct mRootElementFrame so that anonymous internal frames such as
+ // <html> with table style can copy their parent frame's mWritingMode in
+ // nsIFrame::Init().
+ MOZ_ASSERT(!mRootElementFrame,
+ "We need to copy <body>'s principal writing-mode before "
+ "constructing mRootElementFrame.");
+
+ const WritingMode docElementWM(computedStyle);
+ Element* body = mDocument->GetBodyElement();
+ if (body) {
+ RefPtr<ComputedStyle> bodyStyle = ResolveComputedStyle(body);
+ const WritingMode bodyWM(bodyStyle);
+
+ if (bodyWM != docElementWM) {
+ nsContentUtils::ReportToConsole(
+ nsIScriptError::warningFlag, "Layout"_ns, mDocument,
+ nsContentUtils::eLAYOUT_PROPERTIES,
+ "PrincipalWritingModePropagationWarning");
+ }
+
+ mDocElementContainingBlock->PropagateWritingModeToSelfAndAncestors(
+ bodyWM);
+ } else {
+ mDocElementContainingBlock->PropagateWritingModeToSelfAndAncestors(
+ docElementWM);
+ }
+ }
+
+ nsFrameConstructorSaveState docElementContainingBlockAbsoluteSaveState;
+ if (mHasRootAbsPosContainingBlock) {
+ // Push the absolute containing block now so we can absolutely position
+ // the root element
+ mDocElementContainingBlock->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ state.PushAbsoluteContainingBlock(
+ mDocElementContainingBlock, mDocElementContainingBlock,
+ docElementContainingBlockAbsoluteSaveState);
+ }
+
+ // The rules from CSS 2.1, section 9.2.4, have already been applied
+ // by the style system, so we can assume that display->mDisplay is
+ // either NONE, BLOCK, or TABLE.
+
+ // contentFrame is the primary frame for the root element. frameList contains
+ // the children of the initial containing block.
+ //
+ // The first of those frames is usually `contentFrame`, but it can be
+ // different, in particular if the root frame is positioned, in which case
+ // contentFrame is the out-of-flow frame and frameList.FirstChild() is the
+ // placeholder.
+ //
+ // The rest of the frames in frameList are the anonymous content of the canvas
+ // frame.
+ nsContainerFrame* contentFrame;
+ nsFrameList frameList;
+ bool processChildren = false;
+
+ nsFrameConstructorSaveState absoluteSaveState;
+
+ // Check whether we need to build a XUL box or SVG root frame
+#ifdef MOZ_XUL
+ if (aDocElement->IsXULElement()) {
+ contentFrame = NS_NewDocElementBoxFrame(mPresShell, computedStyle);
+ InitAndRestoreFrame(state, aDocElement, mDocElementContainingBlock,
+ contentFrame);
+ frameList = {contentFrame, contentFrame};
+ processChildren = true;
+ } else
+#endif
+ if (aDocElement->IsSVGElement()) {
+ if (!aDocElement->IsSVGElement(nsGkAtoms::svg)) {
+ return nullptr;
+ }
+ // We're going to call the right function ourselves, so no need to give a
+ // function to this FrameConstructionData.
+
+ // XXXbz on the other hand, if we converted this whole function to
+ // FrameConstructionData/Item, then we'd need the right function
+ // here... but would probably be able to get away with less code in this
+ // function in general.
+ static const FrameConstructionData rootSVGData = FCDATA_DECL(0, nullptr);
+ AutoFrameConstructionItem item(this, &rootSVGData, aDocElement,
+ do_AddRef(computedStyle), true);
+
+ contentFrame = static_cast<nsContainerFrame*>(ConstructOuterSVG(
+ state, item, mDocElementContainingBlock, display, frameList));
+ } else if (display->mDisplay == StyleDisplay::Flex ||
+ display->mDisplay == StyleDisplay::WebkitBox ||
+ display->mDisplay == StyleDisplay::Grid ||
+ (StaticPrefs::layout_css_emulate_moz_box_with_flex() &&
+ display->mDisplay == StyleDisplay::MozBox)) {
+ auto func = display->mDisplay == StyleDisplay::Grid
+ ? NS_NewGridContainerFrame
+ : NS_NewFlexContainerFrame;
+ contentFrame = func(mPresShell, computedStyle);
+ InitAndRestoreFrame(
+ state, aDocElement,
+ state.GetGeometricParent(*display, mDocElementContainingBlock),
+ contentFrame);
+ state.AddChild(contentFrame, frameList, aDocElement,
+ mDocElementContainingBlock);
+ processChildren = true;
+
+ contentFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ if (display->IsAbsPosContainingBlock(contentFrame)) {
+ state.PushAbsoluteContainingBlock(contentFrame, contentFrame,
+ absoluteSaveState);
+ }
+ } else if (display->mDisplay == StyleDisplay::Table) {
+ // We're going to call the right function ourselves, so no need to give a
+ // function to this FrameConstructionData.
+
+ // XXXbz on the other hand, if we converted this whole function to
+ // FrameConstructionData/Item, then we'd need the right function
+ // here... but would probably be able to get away with less code in this
+ // function in general.
+ static const FrameConstructionData rootTableData = FCDATA_DECL(0, nullptr);
+ AutoFrameConstructionItem item(this, &rootTableData, aDocElement,
+ do_AddRef(computedStyle), true);
+
+ // if the document is a table then just populate it.
+ contentFrame = static_cast<nsContainerFrame*>(ConstructTable(
+ state, item, mDocElementContainingBlock, display, frameList));
+ } else if (display->DisplayInside() == StyleDisplayInside::Ruby) {
+ static const FrameConstructionData data =
+ FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructBlockRubyFrame);
+ AutoFrameConstructionItem item(this, &data, aDocElement,
+ do_AddRef(computedStyle), true);
+ contentFrame = static_cast<nsContainerFrame*>(ConstructBlockRubyFrame(
+ state, item,
+ state.GetGeometricParent(*display, mDocElementContainingBlock), display,
+ frameList));
+ } else {
+ MOZ_ASSERT(display->mDisplay == StyleDisplay::Block ||
+ display->mDisplay == StyleDisplay::FlowRoot,
+ "Unhandled display type for root element");
+ contentFrame = NS_NewBlockFormattingContext(mPresShell, computedStyle);
+ ConstructBlock(
+ state, aDocElement,
+ state.GetGeometricParent(*display, mDocElementContainingBlock),
+ mDocElementContainingBlock, computedStyle, &contentFrame, frameList,
+ display->IsAbsPosContainingBlock(contentFrame) ? contentFrame
+ : nullptr);
+ }
+
+ MOZ_ASSERT(frameList.FirstChild());
+ MOZ_ASSERT(frameList.FirstChild()->GetContent() == aDocElement);
+ MOZ_ASSERT(contentFrame);
+
+ MOZ_ASSERT(
+ processChildren ? !mRootElementFrame : mRootElementFrame == contentFrame,
+ "unexpected mRootElementFrame");
+ if (processChildren) {
+ SetRootElementFrameAndConstructCanvasAnonContent(contentFrame, state,
+ frameList);
+ }
+
+ // Figure out which frame has the main style for the document element,
+ // assigning it to mRootElementStyleFrame.
+ // Backgrounds should be propagated from that frame to the viewport.
+ contentFrame->GetParentComputedStyle(&mRootElementStyleFrame);
+ bool isChild = mRootElementStyleFrame &&
+ mRootElementStyleFrame->GetParent() == contentFrame;
+ if (!isChild) {
+ mRootElementStyleFrame = mRootElementFrame;
+ }
+
+ if (processChildren) {
+ // Still need to process the child content
+ nsFrameList childList;
+
+ NS_ASSERTION(!contentFrame->IsBlockFrameOrSubclass() &&
+ !contentFrame->IsFrameOfType(nsIFrame::eSVG),
+ "Only XUL frames should reach here");
+ ProcessChildren(state, aDocElement, computedStyle, contentFrame, true,
+ childList, false);
+
+ // Set the initial child lists
+ contentFrame->SetInitialChildList(kPrincipalList, childList);
+ }
+
+ nsIFrame* newFrame = frameList.FirstChild();
+ // set the primary frame
+ aDocElement->SetPrimaryFrame(contentFrame);
+ mDocElementContainingBlock->AppendFrames(kPrincipalList, frameList);
+
+ MOZ_ASSERT(!state.mHavePendingPopupgroup,
+ "Should have proccessed pending popup group by now");
+
+ return newFrame;
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructRootFrame() {
+ AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ConstructRootFrame",
+ LAYOUT_FrameConstruction);
+ AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
+
+ ServoStyleSet* styleSet = mPresShell->StyleSet();
+
+ // --------- BUILD VIEWPORT -----------
+ RefPtr<ComputedStyle> viewportPseudoStyle =
+ styleSet->ResolveInheritingAnonymousBoxStyle(PseudoStyleType::viewport,
+ nullptr);
+ ViewportFrame* viewportFrame =
+ NS_NewViewportFrame(mPresShell, viewportPseudoStyle);
+
+ // XXXbz do we _have_ to pass a null content pointer to that frame?
+ // Would it really kill us to pass in the root element or something?
+ // What would that break?
+ viewportFrame->Init(nullptr, nullptr, nullptr);
+
+ viewportFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+
+ // Bind the viewport frame to the root view
+ nsView* rootView = mPresShell->GetViewManager()->GetRootView();
+ viewportFrame->SetView(rootView);
+
+ viewportFrame->SyncFrameViewProperties(rootView);
+ nsContainerFrame::SyncWindowProperties(mPresShell->GetPresContext(),
+ viewportFrame, rootView, nullptr,
+ nsContainerFrame::SET_ASYNC);
+
+ // Make it an absolute container for fixed-pos elements
+ viewportFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ viewportFrame->MarkAsAbsoluteContainingBlock();
+
+ return viewportFrame;
+}
+
+void nsCSSFrameConstructor::SetUpDocElementContainingBlock(
+ nsIContent* aDocElement) {
+ MOZ_ASSERT(aDocElement, "No element?");
+ MOZ_ASSERT(!aDocElement->GetParent(), "Not root content?");
+ MOZ_ASSERT(aDocElement->GetUncomposedDoc(), "Not in a document?");
+ MOZ_ASSERT(aDocElement->GetUncomposedDoc()->GetRootElement() == aDocElement,
+ "Not the root of the document?");
+
+ /*
+ how the root frame hierarchy should look
+
+ Galley presentation, non-XUL, with scrolling:
+
+ ViewportFrame [fixed-cb]
+ nsHTMLScrollFrame
+ nsCanvasFrame [abs-cb]
+ root element frame (nsBlockFrame, SVGOuterSVGFrame,
+ nsTableWrapperFrame, nsPlaceholderFrame)
+
+ Galley presentation, XUL
+
+ ViewportFrame [fixed-cb]
+ nsRootBoxFrame
+ root element frame (nsDocElementBoxFrame)
+
+ Print presentation, non-XUL
+
+ ViewportFrame
+ nsPageSequenceFrame
+ PrintedSheetFrame
+ nsPageFrame
+ nsPageContentFrame [fixed-cb]
+ nsCanvasFrame [abs-cb]
+ root element frame (nsBlockFrame, SVGOuterSVGFrame,
+ nsTableWrapperFrame, nsPlaceholderFrame)
+
+ Print-preview presentation, non-XUL
+
+ ViewportFrame
+ nsHTMLScrollFrame
+ nsPageSequenceFrame
+ PrintedSheetFrame
+ nsPageFrame
+ nsPageContentFrame [fixed-cb]
+ nsCanvasFrame [abs-cb]
+ root element frame (nsBlockFrame, SVGOuterSVGFrame,
+ nsTableWrapperFrame, nsPlaceholderFrame)
+
+ Print/print preview of XUL is not supported.
+ [fixed-cb]: the default containing block for fixed-pos content
+ [abs-cb]: the default containing block for abs-pos content
+
+ Meaning of nsCSSFrameConstructor fields:
+ mRootElementFrame is "root element frame". This is the primary frame for
+ the root element.
+ mDocElementContainingBlock is the parent of mRootElementFrame
+ (i.e. nsCanvasFrame or nsRootBoxFrame)
+ mPageSequenceFrame is the nsPageSequenceFrame, or null if there isn't
+ one
+ */
+
+ // --------- CREATE ROOT FRAME -------
+
+ // Create the root frame. The document element's frame is a child of the
+ // root frame.
+ //
+ // The root frame serves two purposes:
+ // - reserves space for any margins needed for the document element's frame
+ // - renders the document element's background. This ensures the background
+ // covers the entire canvas as specified by the CSS2 spec
+
+ nsPresContext* presContext = mPresShell->GetPresContext();
+ bool isPaginated = presContext->IsRootPaginatedDocument();
+ nsContainerFrame* viewportFrame =
+ static_cast<nsContainerFrame*>(GetRootFrame());
+ ComputedStyle* viewportPseudoStyle = viewportFrame->Style();
+
+ nsContainerFrame* rootFrame = nullptr;
+ PseudoStyleType rootPseudo;
+
+ if (!isPaginated) {
+#ifdef MOZ_XUL
+ if (aDocElement->IsXULElement()) {
+ // pass a temporary stylecontext, the correct one will be set later
+ rootFrame = NS_NewRootBoxFrame(mPresShell, viewportPseudoStyle);
+ } else
+#endif
+ {
+ // pass a temporary stylecontext, the correct one will be set later
+ rootFrame = NS_NewCanvasFrame(mPresShell, viewportPseudoStyle);
+ mHasRootAbsPosContainingBlock = true;
+ }
+
+ rootPseudo = PseudoStyleType::canvas;
+ mDocElementContainingBlock = rootFrame;
+ } else {
+ // Create a page sequence frame
+ rootFrame = mPageSequenceFrame =
+ NS_NewPageSequenceFrame(mPresShell, viewportPseudoStyle);
+ rootPseudo = PseudoStyleType::pageSequence;
+ rootFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+ }
+
+ // --------- IF SCROLLABLE WRAP IN SCROLLFRAME --------
+
+ // If the device supports scrolling (e.g., in galley mode on the screen and
+ // for print-preview, but not when printing), then create a scroll frame that
+ // will act as the scrolling mechanism for the viewport.
+ // XXX Do we even need a viewport when printing to a printer?
+
+ bool isHTML = aDocElement->IsHTMLElement();
+ bool isXUL = false;
+
+ if (!isHTML) {
+ isXUL = aDocElement->IsXULElement();
+ }
+
+ // Never create scrollbars for XUL documents or top level XHTML documents that
+ // disable scrolling.
+ bool isScrollable = true;
+ if (isPaginated) {
+ isScrollable = presContext->HasPaginatedScrolling();
+ } else if (isXUL) {
+ isScrollable = false;
+ } else if (aDocElement->OwnerDoc()->IsDocumentURISchemeChrome() &&
+ aDocElement->AsElement()->AttrValueIs(
+ kNameSpaceID_None, nsGkAtoms::scrolling, nsGkAtoms::_false,
+ eCaseMatters)) {
+ isScrollable = false;
+ }
+
+ // We no longer need to do overflow propagation here. It's taken care of
+ // when we construct frames for the element whose overflow might be
+ // propagated
+ NS_ASSERTION(!isScrollable || !isXUL,
+ "XUL documents should never be scrollable - see above");
+
+ nsContainerFrame* newFrame = rootFrame;
+ RefPtr<ComputedStyle> rootPseudoStyle;
+ // we must create a state because if the scrollbars are GFX it needs the
+ // state to build the scrollbar frames.
+ nsFrameConstructorState state(mPresShell, nullptr, nullptr, nullptr);
+
+ // Start off with the viewport as parent; we'll adjust it as needed.
+ nsContainerFrame* parentFrame = viewportFrame;
+
+ ServoStyleSet* styleSet = mPresShell->StyleSet();
+ // If paginated, make sure we don't put scrollbars in
+ if (!isScrollable) {
+ rootPseudoStyle = styleSet->ResolveInheritingAnonymousBoxStyle(
+ rootPseudo, viewportPseudoStyle);
+ } else {
+ if (rootPseudo == PseudoStyleType::canvas) {
+ rootPseudo = PseudoStyleType::scrolledCanvas;
+ } else {
+ NS_ASSERTION(rootPseudo == PseudoStyleType::pageSequence,
+ "Unknown root pseudo");
+ rootPseudo = PseudoStyleType::scrolledPageSequence;
+ }
+
+ // Build the frame. We give it the content we are wrapping which is the
+ // document element, the root frame, the parent view port frame, and we
+ // should get back the new frame and the scrollable view if one was
+ // created.
+
+ // resolve a context for the scrollframe
+ RefPtr<ComputedStyle> computedStyle =
+ styleSet->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::viewportScroll, viewportPseudoStyle);
+
+ // Note that the viewport scrollframe is always built with
+ // overflow:auto style. This forces the scroll frame to create
+ // anonymous content for both scrollbars. This is necessary even
+ // if the HTML or BODY elements are overriding the viewport
+ // scroll style to 'hidden' --- dynamic style changes might put
+ // scrollbars back on the viewport and we don't want to have to
+ // reframe the viewport to create the scrollbar content.
+ newFrame = nullptr;
+ rootPseudoStyle =
+ BeginBuildingScrollFrame(state, aDocElement, computedStyle,
+ viewportFrame, rootPseudo, true, newFrame);
+ parentFrame = newFrame;
+ }
+
+ rootFrame->SetComputedStyleWithoutNotification(rootPseudoStyle);
+ rootFrame->Init(aDocElement, parentFrame, nullptr);
+
+ if (isScrollable) {
+ FinishBuildingScrollFrame(parentFrame, rootFrame);
+ }
+
+ if (isPaginated) {
+ // Create the first printed sheet frame, as the sole child (for now) of our
+ // page sequence frame (rootFrame).
+ auto* printedSheetFrame =
+ ConstructPrintedSheetFrame(mPresShell, rootFrame, nullptr);
+ printedSheetFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+ SetInitialSingleChild(rootFrame, printedSheetFrame);
+
+ // Create the first page, as the sole child (for now) of the printed sheet
+ // frame that we just created.
+ nsContainerFrame* canvasFrame;
+ nsContainerFrame* pageFrame =
+ ConstructPageFrame(mPresShell, printedSheetFrame, nullptr, canvasFrame);
+ pageFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+ SetInitialSingleChild(printedSheetFrame, pageFrame);
+
+ // The eventual parent of the document element frame.
+ // XXX should this be set for every new page (in ConstructPageFrame)?
+ mDocElementContainingBlock = canvasFrame;
+ mHasRootAbsPosContainingBlock = true;
+ }
+
+ if (viewportFrame->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
+ SetInitialSingleChild(viewportFrame, newFrame);
+ } else {
+ nsFrameList newFrameList(newFrame, newFrame);
+ viewportFrame->AppendFrames(kPrincipalList, newFrameList);
+ }
+}
+
+void nsCSSFrameConstructor::ConstructAnonymousContentForCanvas(
+ nsFrameConstructorState& aState, nsContainerFrame* aFrame,
+ nsIContent* aDocElement, nsFrameList& aFrameList) {
+ NS_ASSERTION(aFrame->IsCanvasFrame(), "aFrame should be canvas frame!");
+ MOZ_ASSERT(mRootElementFrame->GetContent() == aDocElement);
+
+ AutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> anonymousItems;
+ GetAnonymousContent(aDocElement, aFrame, anonymousItems);
+ if (anonymousItems.IsEmpty()) {
+ return;
+ }
+
+ AutoFrameConstructionItemList itemsToConstruct(this);
+ AddFCItemsForAnonymousContent(aState, aFrame, anonymousItems,
+ itemsToConstruct);
+
+ ConstructFramesFromItemList(aState, itemsToConstruct, aFrame,
+ /* aParentIsWrapperAnonBox = */ false,
+ aFrameList);
+}
+
+PrintedSheetFrame* nsCSSFrameConstructor::ConstructPrintedSheetFrame(
+ PresShell* aPresShell, nsContainerFrame* aParentFrame,
+ nsIFrame* aPrevSheetFrame) {
+ ComputedStyle* parentComputedStyle = aParentFrame->Style();
+ ServoStyleSet* styleSet = aPresShell->StyleSet();
+
+ RefPtr<ComputedStyle> printedSheetPseudoStyle =
+ styleSet->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::printedSheet, parentComputedStyle);
+
+ auto* printedSheetFrame =
+ NS_NewPrintedSheetFrame(aPresShell, printedSheetPseudoStyle);
+
+ printedSheetFrame->Init(nullptr, aParentFrame, aPrevSheetFrame);
+
+ return printedSheetFrame;
+}
+
+nsContainerFrame* nsCSSFrameConstructor::ConstructPageFrame(
+ PresShell* aPresShell, nsContainerFrame* aParentFrame,
+ nsIFrame* aPrevPageFrame, nsContainerFrame*& aCanvasFrame) {
+ ComputedStyle* parentComputedStyle = aParentFrame->Style();
+ ServoStyleSet* styleSet = aPresShell->StyleSet();
+
+ RefPtr<ComputedStyle> pagePseudoStyle =
+ styleSet->ResolveInheritingAnonymousBoxStyle(PseudoStyleType::page,
+ parentComputedStyle);
+
+ nsContainerFrame* pageFrame = NS_NewPageFrame(aPresShell, pagePseudoStyle);
+
+ // Initialize the page frame and force it to have a view. This makes printing
+ // of the pages easier and faster.
+ pageFrame->Init(nullptr, aParentFrame, aPrevPageFrame);
+
+ RefPtr<ComputedStyle> pageContentPseudoStyle;
+ pageContentPseudoStyle = styleSet->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::pageContent, pagePseudoStyle);
+
+ nsContainerFrame* pageContentFrame =
+ NS_NewPageContentFrame(aPresShell, pageContentPseudoStyle);
+
+ // Initialize the page content frame and force it to have a view. Also make it
+ // the containing block for fixed elements which are repeated on every page.
+ nsIFrame* prevPageContentFrame = nullptr;
+ if (aPrevPageFrame) {
+ prevPageContentFrame = aPrevPageFrame->PrincipalChildList().FirstChild();
+ NS_ASSERTION(prevPageContentFrame, "missing page content frame");
+ }
+ pageContentFrame->Init(nullptr, pageFrame, prevPageContentFrame);
+ if (!prevPageContentFrame) {
+ pageContentFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+ }
+ SetInitialSingleChild(pageFrame, pageContentFrame);
+ // Make it an absolute container for fixed-pos elements
+ pageContentFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ pageContentFrame->MarkAsAbsoluteContainingBlock();
+
+ RefPtr<ComputedStyle> canvasPseudoStyle;
+ canvasPseudoStyle = styleSet->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::canvas, pageContentPseudoStyle);
+
+ aCanvasFrame = NS_NewCanvasFrame(aPresShell, canvasPseudoStyle);
+
+ nsIFrame* prevCanvasFrame = nullptr;
+ if (prevPageContentFrame) {
+ prevCanvasFrame = prevPageContentFrame->PrincipalChildList().FirstChild();
+ NS_ASSERTION(prevCanvasFrame, "missing canvas frame");
+ }
+ aCanvasFrame->Init(nullptr, pageContentFrame, prevCanvasFrame);
+ SetInitialSingleChild(pageContentFrame, aCanvasFrame);
+ return pageFrame;
+}
+
+/* static */
+nsIFrame* nsCSSFrameConstructor::CreatePlaceholderFrameFor(
+ PresShell* aPresShell, nsIContent* aContent, nsIFrame* aFrame,
+ nsContainerFrame* aParentFrame, nsIFrame* aPrevInFlow,
+ nsFrameState aTypeBit) {
+ RefPtr<ComputedStyle> placeholderStyle =
+ aPresShell->StyleSet()->ResolveStyleForPlaceholder();
+
+ // The placeholder frame gets a pseudo style.
+ nsPlaceholderFrame* placeholderFrame =
+ NS_NewPlaceholderFrame(aPresShell, placeholderStyle, aTypeBit);
+
+ placeholderFrame->Init(aContent, aParentFrame, aPrevInFlow);
+
+ // Associate the placeholder/out-of-flow with each other.
+ placeholderFrame->SetOutOfFlowFrame(aFrame);
+ aFrame->SetProperty(nsIFrame::PlaceholderFrameProperty(), placeholderFrame);
+
+ aFrame->AddStateBits(NS_FRAME_OUT_OF_FLOW);
+
+ return placeholderFrame;
+}
+
+// Clears any lazy bits set in the range [aStartContent, aEndContent). If
+// aEndContent is null, that means to clear bits in all siblings starting with
+// aStartContent. aStartContent must not be null unless aEndContent is also
+// null. We do this so that when new children are inserted under elements whose
+// frame is a leaf the new children don't cause us to try to construct frames
+// for the existing children again.
+static inline void ClearLazyBits(nsIContent* aStartContent,
+ nsIContent* aEndContent) {
+ MOZ_ASSERT(aStartContent || !aEndContent,
+ "Must have start child if we have an end child");
+
+ for (nsIContent* cur = aStartContent; cur != aEndContent;
+ cur = cur->GetNextSibling()) {
+ cur->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME);
+ }
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructSelectFrame(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay,
+ nsFrameList& aFrameList) {
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+
+ // Construct a frame-based listbox or combobox
+ dom::HTMLSelectElement* sel = dom::HTMLSelectElement::FromNode(content);
+ MOZ_ASSERT(sel);
+ if (sel->IsCombobox()) {
+ // Construct a frame-based combo box.
+ // The frame-based combo box is built out of three parts. A display area, a
+ // button and a dropdown list. The display area and button are created
+ // through anonymous content. The drop-down list's frame is created
+ // explicitly. The combobox frame shares its content with the drop-down
+ // list.
+ nsFrameState flags = NS_BLOCK_FLOAT_MGR;
+ nsComboboxControlFrame* comboboxFrame =
+ NS_NewComboboxControlFrame(mPresShell, computedStyle, flags);
+
+ // Save the history state so we don't restore during construction
+ // since the complete tree is required before we restore.
+ nsILayoutHistoryState* historyState = aState.mFrameState;
+ aState.mFrameState = nullptr;
+ // Initialize the combobox frame
+ InitAndRestoreFrame(aState, content,
+ aState.GetGeometricParent(*aStyleDisplay, aParentFrame),
+ comboboxFrame);
+
+ comboboxFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+
+ aState.AddChild(comboboxFrame, aFrameList, content, aParentFrame);
+
+ // Resolve pseudo element style for the dropdown list
+ RefPtr<ComputedStyle> listStyle;
+ listStyle = mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::dropDownList, computedStyle);
+
+ // Create a listbox
+ nsContainerFrame* listFrame = NS_NewListControlFrame(mPresShell, listStyle);
+
+ // Notify the listbox that it is being used as a dropdown list.
+ nsListControlFrame* listControlFrame = do_QueryFrame(listFrame);
+ if (listControlFrame) {
+ listControlFrame->SetComboboxFrame(comboboxFrame);
+ }
+ // Notify combobox that it should use the listbox as it's popup
+ comboboxFrame->SetDropDown(listFrame);
+
+ NS_ASSERTION(!listFrame->IsAbsPosContainingBlock(),
+ "Ended up with positioned dropdown list somehow.");
+ NS_ASSERTION(!listFrame->IsFloating(),
+ "Ended up with floating dropdown list somehow.");
+
+ // child frames of combobox frame
+ nsFrameList childList;
+
+ // Initialize the scroll frame positioned. Note that it is NOT
+ // initialized as absolutely positioned.
+ nsContainerFrame* scrolledFrame =
+ NS_NewSelectsAreaFrame(mPresShell, computedStyle, flags);
+
+ InitializeSelectFrame(aState, listFrame, scrolledFrame, content,
+ comboboxFrame, listStyle, true, childList);
+
+ NS_ASSERTION(listFrame->GetView(), "ListFrame's view is nullptr");
+
+ // Create display and button frames from the combobox's anonymous content.
+ // The anonymous content is appended to existing anonymous content for this
+ // element (the scrollbars).
+ //
+ // nsComboboxControlFrame needs special frame creation behavior for its
+ // first piece of anonymous content, which means that we can't take the
+ // normal ProcessChildren path.
+ AutoTArray<nsIAnonymousContentCreator::ContentInfo, 2> newAnonymousItems;
+ DebugOnly<nsresult> rv =
+ GetAnonymousContent(content, comboboxFrame, newAnonymousItems);
+ MOZ_ASSERT(NS_SUCCEEDED(rv));
+ MOZ_ASSERT(newAnonymousItems.Length() == 2);
+
+ // Manually create a frame for the special NAC.
+ MOZ_ASSERT(newAnonymousItems[0].mContent ==
+ comboboxFrame->GetDisplayNode());
+ newAnonymousItems.RemoveElementAt(0);
+ nsIFrame* customFrame = comboboxFrame->CreateFrameForDisplayNode();
+ MOZ_ASSERT(customFrame);
+ childList.AppendFrame(nullptr, customFrame);
+
+ // The other piece of NAC can take the normal path.
+ AutoFrameConstructionItemList fcItems(this);
+ AddFCItemsForAnonymousContent(aState, comboboxFrame, newAnonymousItems,
+ fcItems);
+ ConstructFramesFromItemList(aState, fcItems, comboboxFrame,
+ /* aParentIsWrapperAnonBox = */ false,
+ childList);
+
+ comboboxFrame->SetInitialChildList(kPrincipalList, childList);
+
+ // Initialize the additional popup child list which contains the
+ // dropdown list frame.
+ nsFrameList popupList;
+ popupList.AppendFrame(nullptr, listFrame);
+ comboboxFrame->SetInitialChildList(nsIFrame::kSelectPopupList, popupList);
+
+ aState.mFrameState = historyState;
+ if (aState.mFrameState) {
+ // Restore frame state for the entire subtree of |comboboxFrame|.
+ RestoreFrameState(comboboxFrame, aState.mFrameState);
+ }
+ return comboboxFrame;
+ }
+
+ // Listbox, not combobox
+ nsContainerFrame* listFrame =
+ NS_NewListControlFrame(mPresShell, computedStyle);
+
+ nsContainerFrame* scrolledFrame =
+ NS_NewSelectsAreaFrame(mPresShell, computedStyle, NS_BLOCK_FLOAT_MGR);
+
+ // ******* this code stolen from Initialze ScrollFrame ********
+ // please adjust this code to use BuildScrollFrame.
+
+ InitializeSelectFrame(aState, listFrame, scrolledFrame, content, aParentFrame,
+ computedStyle, false, aFrameList);
+
+ return listFrame;
+}
+
+/**
+ * Used to be InitializeScrollFrame but now it's only used for the select tag
+ * But the select tag should really be fixed to use GFX scrollbars that can
+ * be create with BuildScrollFrame.
+ */
+void nsCSSFrameConstructor::InitializeSelectFrame(
+ nsFrameConstructorState& aState, nsContainerFrame* scrollFrame,
+ nsContainerFrame* scrolledFrame, nsIContent* aContent,
+ nsContainerFrame* aParentFrame, ComputedStyle* aComputedStyle,
+ bool aBuildCombobox, nsFrameList& aFrameList) {
+ // Initialize it
+ nsContainerFrame* geometricParent =
+ aState.GetGeometricParent(*aComputedStyle->StyleDisplay(), aParentFrame);
+
+ // We don't call InitAndRestoreFrame for scrollFrame because we can only
+ // restore the frame state after its parts have been created (in particular,
+ // the scrollable view). So we have to split Init and Restore.
+
+ scrollFrame->Init(aContent, geometricParent, nullptr);
+
+ if (!aBuildCombobox) {
+ aState.AddChild(scrollFrame, aFrameList, aContent, aParentFrame);
+ }
+
+ BuildScrollFrame(aState, aContent, aComputedStyle, scrolledFrame,
+ geometricParent, scrollFrame);
+
+ if (aState.mFrameState) {
+ // Restore frame state for the scroll frame
+ RestoreFrameStateFor(scrollFrame, aState.mFrameState);
+ }
+
+ // Process children
+ nsFrameList childList;
+
+ ProcessChildren(aState, aContent, aComputedStyle, scrolledFrame, false,
+ childList, false);
+
+ // Set the scrolled frame's initial child lists
+ scrolledFrame->SetInitialChildList(kPrincipalList, childList);
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructFieldSetFrame(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay,
+ nsFrameList& aFrameList) {
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+
+ nsContainerFrame* fieldsetFrame =
+ NS_NewFieldSetFrame(mPresShell, computedStyle);
+
+ // Initialize it
+ InitAndRestoreFrame(aState, content,
+ aState.GetGeometricParent(*aStyleDisplay, aParentFrame),
+ fieldsetFrame);
+
+ fieldsetFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+
+ // Resolve style and initialize the frame
+ RefPtr<ComputedStyle> fieldsetContentStyle;
+ fieldsetContentStyle =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::fieldsetContent, computedStyle);
+
+ const nsStyleDisplay* fieldsetContentDisplay =
+ fieldsetContentStyle->StyleDisplay();
+ bool isScrollable = fieldsetContentDisplay->IsScrollableOverflow();
+ nsContainerFrame* scrollFrame = nullptr;
+ if (isScrollable) {
+ fieldsetContentStyle = BeginBuildingScrollFrame(
+ aState, content, fieldsetContentStyle, fieldsetFrame,
+ PseudoStyleType::scrolledContent, false, scrollFrame);
+ }
+
+ // Create the inner ::-moz-fieldset-content frame.
+ nsContainerFrame* contentFrameTop;
+ nsContainerFrame* contentFrame;
+ auto parent = scrollFrame ? scrollFrame : fieldsetFrame;
+ MOZ_ASSERT(fieldsetContentDisplay->DisplayOutside() ==
+ StyleDisplayOutside::Block);
+ switch (fieldsetContentDisplay->DisplayInside()) {
+ case StyleDisplayInside::Flex:
+ contentFrame = NS_NewFlexContainerFrame(mPresShell, fieldsetContentStyle);
+ InitAndRestoreFrame(aState, content, parent, contentFrame);
+ contentFrameTop = contentFrame;
+ break;
+ case StyleDisplayInside::Grid:
+ contentFrame = NS_NewGridContainerFrame(mPresShell, fieldsetContentStyle);
+ InitAndRestoreFrame(aState, content, parent, contentFrame);
+ contentFrameTop = contentFrame;
+ break;
+ default: {
+ MOZ_ASSERT(fieldsetContentDisplay->mDisplay == StyleDisplay::Block,
+ "bug in StyleAdjuster::adjust_for_fieldset_content?");
+
+ contentFrame =
+ NS_NewBlockFormattingContext(mPresShell, fieldsetContentStyle);
+ if (fieldsetContentStyle->StyleColumn()->IsColumnContainerStyle()) {
+ contentFrameTop = BeginBuildingColumns(
+ aState, content, parent, contentFrame, fieldsetContentStyle);
+ } else {
+ // No need to create column container. Initialize content frame.
+ InitAndRestoreFrame(aState, content, parent, contentFrame);
+ contentFrameTop = contentFrame;
+ }
+
+ break;
+ }
+ }
+
+ aState.AddChild(fieldsetFrame, aFrameList, content, aParentFrame);
+
+ // Process children
+ nsFrameConstructorSaveState absoluteSaveState;
+ nsFrameList childList;
+
+ contentFrameTop->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ if (fieldsetFrame->IsAbsPosContainingBlock()) {
+ aState.PushAbsoluteContainingBlock(contentFrameTop, fieldsetFrame,
+ absoluteSaveState);
+ }
+
+ ProcessChildren(aState, content, computedStyle, contentFrame, true, childList,
+ true);
+
+ nsFrameList fieldsetKids;
+ fieldsetKids.AppendFrame(nullptr,
+ scrollFrame ? scrollFrame : contentFrameTop);
+
+ for (nsFrameList::Enumerator e(childList); !e.AtEnd(); e.Next()) {
+ nsIFrame* child = e.get();
+ nsContainerFrame* cif = child->GetContentInsertionFrame();
+ if (cif && cif->IsLegendFrame()) {
+ // We want the legend to be the first frame in the fieldset child list.
+ // That way the EventStateManager will do the right thing when tabbing
+ // from a selection point within the legend (bug 236071), which is
+ // used for implementing legend access keys (bug 81481).
+ // GetAdjustedParentFrame() below depends on this frame order.
+ childList.RemoveFrame(child);
+ // Make sure to reparent the legend so it has the fieldset as the parent.
+ fieldsetKids.InsertFrame(fieldsetFrame, nullptr, child);
+ // Legend is no longer in the multicol container. Remove the bit.
+ child->RemoveStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR);
+ if (scrollFrame) {
+ StickyScrollContainer::NotifyReparentedFrameAcrossScrollFrameBoundary(
+ child, contentFrame);
+ }
+ break;
+ }
+ }
+
+ if (!MayNeedToCreateColumnSpanSiblings(contentFrame, childList)) {
+ // Set the inner frame's initial child lists.
+ contentFrame->SetInitialChildList(kPrincipalList, childList);
+ } else {
+ // Extract any initial non-column-span kids, and put them in inner frame's
+ // child list.
+ nsFrameList initialNonColumnSpanKids =
+ childList.Split([](nsIFrame* f) { return f->IsColumnSpan(); });
+ contentFrame->SetInitialChildList(kPrincipalList, initialNonColumnSpanKids);
+
+ if (childList.NotEmpty()) {
+ nsFrameList columnSpanSiblings = CreateColumnSpanSiblings(
+ aState, contentFrame, childList,
+ // Column content should never be a absolute/fixed positioned
+ // containing block. Pass nullptr as aPositionedFrame.
+ nullptr);
+ FinishBuildingColumns(aState, contentFrameTop, contentFrame,
+ columnSpanSiblings);
+ }
+ }
+
+ if (isScrollable) {
+ FinishBuildingScrollFrame(scrollFrame, contentFrameTop);
+ }
+
+ // Set the outer frame's initial child list
+ fieldsetFrame->SetInitialChildList(kPrincipalList, fieldsetKids);
+
+ // Our new frame returned is the outer frame, which is the fieldset frame.
+ return fieldsetFrame;
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructDetailsFrame(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay,
+ nsFrameList& aFrameList) {
+ if (!aStyleDisplay->IsScrollableOverflow()) {
+ return ConstructNonScrollableBlockWithConstructor(
+ aState, aItem, aParentFrame, aStyleDisplay, aFrameList,
+ NS_NewDetailsFrame);
+ }
+
+ // Build a scroll frame to wrap details frame if necessary.
+ return ConstructScrollableBlockWithConstructor(aState, aItem, aParentFrame,
+ aStyleDisplay, aFrameList,
+ NS_NewDetailsFrame);
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructBlockRubyFrame(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay,
+ nsFrameList& aFrameList) {
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+
+ nsBlockFrame* blockFrame = NS_NewBlockFrame(mPresShell, computedStyle);
+ nsContainerFrame* newFrame = blockFrame;
+ nsContainerFrame* geometricParent =
+ aState.GetGeometricParent(*aStyleDisplay, aParentFrame);
+ if ((aItem.mFCData->mBits & FCDATA_MAY_NEED_SCROLLFRAME) &&
+ aStyleDisplay->IsScrollableOverflow()) {
+ nsContainerFrame* scrollframe = nullptr;
+ BuildScrollFrame(aState, content, computedStyle, blockFrame,
+ geometricParent, scrollframe);
+ newFrame = scrollframe;
+ } else {
+ InitAndRestoreFrame(aState, content, geometricParent, blockFrame);
+ }
+
+ RefPtr<ComputedStyle> rubyStyle =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::blockRubyContent, computedStyle);
+ nsContainerFrame* rubyFrame = NS_NewRubyFrame(mPresShell, rubyStyle);
+ InitAndRestoreFrame(aState, content, blockFrame, rubyFrame);
+ SetInitialSingleChild(blockFrame, rubyFrame);
+ blockFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+
+ aState.AddChild(newFrame, aFrameList, content, aParentFrame);
+
+ if (!mRootElementFrame) {
+ // The frame we're constructing will be the root element frame.
+ SetRootElementFrameAndConstructCanvasAnonContent(newFrame, aState,
+ aFrameList);
+ }
+
+ nsFrameConstructorSaveState absoluteSaveState;
+ blockFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ if (aStyleDisplay->IsAbsPosContainingBlock(newFrame)) {
+ aState.PushAbsoluteContainingBlock(blockFrame, blockFrame,
+ absoluteSaveState);
+ }
+ nsFrameConstructorSaveState floatSaveState;
+ if (blockFrame->IsFloatContainingBlock()) {
+ aState.PushFloatContainingBlock(blockFrame, floatSaveState);
+ }
+
+ nsFrameList childList;
+ ProcessChildren(aState, content, rubyStyle, rubyFrame, true, childList, false,
+ nullptr);
+ rubyFrame->SetInitialChildList(kPrincipalList, childList);
+
+ return newFrame;
+}
+
+static nsIFrame* FindAncestorWithGeneratedContentPseudo(nsIFrame* aFrame) {
+ for (nsIFrame* f = aFrame->GetParent(); f; f = f->GetParent()) {
+ NS_ASSERTION(f->IsGeneratedContentFrame(),
+ "should not have exited generated content");
+ auto pseudo = f->Style()->GetPseudoType();
+ if (pseudo == PseudoStyleType::before || pseudo == PseudoStyleType::after ||
+ pseudo == PseudoStyleType::marker)
+ return f;
+ }
+ return nullptr;
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindTextData(const Text& aTextContent,
+ nsIFrame* aParentFrame) {
+ if (aParentFrame && IsFrameForSVG(aParentFrame)) {
+ nsIFrame* ancestorFrame = SVGUtils::GetFirstNonAAncestorFrame(aParentFrame);
+ if (!ancestorFrame || !SVGUtils::IsInSVGTextSubtree(ancestorFrame)) {
+ return nullptr;
+ }
+
+ // FIXME(bug 1588477) Don't render stuff in display: contents / Shadow DOM
+ // subtrees, because TextCorrespondenceRecorder in the SVG text code doesn't
+ // really know how to deal with it. This kinda sucks. :(
+ if (aParentFrame->GetContent() != aTextContent.GetParent()) {
+ return nullptr;
+ }
+
+ static const FrameConstructionData sSVGTextData = FCDATA_DECL(
+ FCDATA_IS_LINE_PARTICIPANT | FCDATA_IS_SVG_TEXT, NS_NewTextFrame);
+ return &sSVGTextData;
+ }
+
+ static const FrameConstructionData sTextData =
+ FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT, NS_NewTextFrame);
+ return &sTextData;
+}
+
+void nsCSSFrameConstructor::ConstructTextFrame(
+ const FrameConstructionData* aData, nsFrameConstructorState& aState,
+ nsIContent* aContent, nsContainerFrame* aParentFrame,
+ ComputedStyle* aComputedStyle, nsFrameList& aFrameList) {
+ MOZ_ASSERT(aData, "Must have frame construction data");
+
+ nsIFrame* newFrame =
+ (*aData->mFunc.mCreationFunc)(mPresShell, aComputedStyle);
+
+ InitAndRestoreFrame(aState, aContent, aParentFrame, newFrame);
+
+ // We never need to create a view for a text frame.
+
+ if (newFrame->IsGeneratedContentFrame()) {
+ UniquePtr<nsGenConInitializer> initializer(
+ static_cast<nsGenConInitializer*>(
+ aContent->TakeProperty(nsGkAtoms::genConInitializerProperty)));
+ if (initializer) {
+ if (initializer->mNode.release()->InitTextFrame(
+ initializer->mList,
+ FindAncestorWithGeneratedContentPseudo(newFrame), newFrame)) {
+ (this->*(initializer->mDirtyAll))();
+ }
+ }
+ }
+
+ // Add the newly constructed frame to the flow
+ aFrameList.AppendFrame(nullptr, newFrame);
+
+ if (!aState.mCreatingExtraFrames) aContent->SetPrimaryFrame(newFrame);
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindDataByInt(int32_t aInt, const Element& aElement,
+ ComputedStyle& aComputedStyle,
+ const FrameConstructionDataByInt* aDataPtr,
+ uint32_t aDataLength) {
+ for (const FrameConstructionDataByInt *curData = aDataPtr,
+ *endData = aDataPtr + aDataLength;
+ curData != endData; ++curData) {
+ if (curData->mInt == aInt) {
+ const FrameConstructionData* data = &curData->mData;
+ if (data->mBits & FCDATA_FUNC_IS_DATA_GETTER) {
+ return data->mFunc.mDataGetter(aElement, aComputedStyle);
+ }
+
+ return data;
+ }
+ }
+
+ return nullptr;
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindDataByTag(const Element& aElement,
+ ComputedStyle& aStyle,
+ const FrameConstructionDataByTag* aDataPtr,
+ uint32_t aDataLength) {
+ const nsAtom* tag = aElement.NodeInfo()->NameAtom();
+ for (const FrameConstructionDataByTag *curData = aDataPtr,
+ *endData = aDataPtr + aDataLength;
+ curData != endData; ++curData) {
+ if (curData->mTag == tag) {
+ const FrameConstructionData* data = &curData->mData;
+ if (data->mBits & FCDATA_FUNC_IS_DATA_GETTER) {
+ return data->mFunc.mDataGetter(aElement, aStyle);
+ }
+
+ return data;
+ }
+ }
+
+ return nullptr;
+}
+
+#define SUPPRESS_FCDATA() FCDATA_DECL(FCDATA_SUPPRESS_FRAME, nullptr)
+#define SIMPLE_INT_CREATE(_int, _func) \
+ { _int, SIMPLE_FCDATA(_func) }
+#define SIMPLE_INT_CHAIN(_int, _func) \
+ { _int, FCDATA_DECL(FCDATA_FUNC_IS_DATA_GETTER, _func) }
+#define COMPLEX_INT_CREATE(_int, _func) \
+ { _int, FULL_CTOR_FCDATA(0, _func) }
+
+#define SIMPLE_TAG_CREATE(_tag, _func) \
+ { nsGkAtoms::_tag, SIMPLE_FCDATA(_func) }
+#define SIMPLE_TAG_CHAIN(_tag, _func) \
+ { nsGkAtoms::_tag, FCDATA_DECL(FCDATA_FUNC_IS_DATA_GETTER, _func) }
+#define COMPLEX_TAG_CREATE(_tag, _func) \
+ { nsGkAtoms::_tag, FULL_CTOR_FCDATA(0, _func) }
+
+static bool IsFrameForFieldSet(nsIFrame* aFrame) {
+ auto pseudo = aFrame->Style()->GetPseudoType();
+ if (pseudo == PseudoStyleType::fieldsetContent ||
+ pseudo == PseudoStyleType::scrolledContent ||
+ pseudo == PseudoStyleType::columnSet ||
+ pseudo == PseudoStyleType::columnContent) {
+ return IsFrameForFieldSet(aFrame->GetParent());
+ }
+ return aFrame->IsFieldSetFrame();
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindHTMLData(const Element& aElement,
+ nsIFrame* aParentFrame,
+ ComputedStyle& aStyle) {
+ MOZ_ASSERT(aElement.IsHTMLElement());
+
+ nsAtom* tag = aElement.NodeInfo()->NameAtom();
+ NS_ASSERTION(!aParentFrame ||
+ aParentFrame->Style()->GetPseudoType() !=
+ PseudoStyleType::fieldsetContent ||
+ aParentFrame->GetParent()->IsFieldSetFrame(),
+ "Unexpected parent for fieldset content anon box");
+ if (tag == nsGkAtoms::legend &&
+ (!aParentFrame || !IsFrameForFieldSet(aParentFrame) ||
+ aStyle.StyleDisplay()->IsFloatingStyle() ||
+ aStyle.StyleDisplay()->IsAbsolutelyPositionedStyle())) {
+ // <legend> is only special inside fieldset, we only check the frame tree
+ // parent because the content tree parent may not be a <fieldset> due to
+ // display:contents, or Shadow DOM. For floated or absolutely positioned
+ // legends we want to construct by display type and not do special legend
+ // stuff.
+ return nullptr;
+ }
+
+ static const FrameConstructionDataByTag sHTMLData[] = {
+ SIMPLE_TAG_CHAIN(img, nsCSSFrameConstructor::FindImgData),
+ SIMPLE_TAG_CHAIN(mozgeneratedcontentimage,
+ nsCSSFrameConstructor::FindGeneratedImageData),
+ {nsGkAtoms::br,
+ FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT | FCDATA_IS_LINE_BREAK,
+ NS_NewBRFrame)},
+ SIMPLE_TAG_CREATE(wbr, NS_NewWBRFrame),
+ SIMPLE_TAG_CHAIN(input, nsCSSFrameConstructor::FindInputData),
+ SIMPLE_TAG_CREATE(textarea, NS_NewTextControlFrame),
+ COMPLEX_TAG_CREATE(select, &nsCSSFrameConstructor::ConstructSelectFrame),
+ SIMPLE_TAG_CHAIN(object, nsCSSFrameConstructor::FindObjectData),
+ SIMPLE_TAG_CHAIN(embed, nsCSSFrameConstructor::FindObjectData),
+ COMPLEX_TAG_CREATE(fieldset,
+ &nsCSSFrameConstructor::ConstructFieldSetFrame),
+ {nsGkAtoms::legend,
+ FCDATA_DECL(FCDATA_ALLOW_BLOCK_STYLES | FCDATA_MAY_NEED_SCROLLFRAME,
+ NS_NewLegendFrame)},
+ SIMPLE_TAG_CREATE(frameset, NS_NewHTMLFramesetFrame),
+ SIMPLE_TAG_CREATE(iframe, NS_NewSubDocumentFrame),
+ {nsGkAtoms::button,
+ FCDATA_WITH_WRAPPING_BLOCK(
+ FCDATA_ALLOW_BLOCK_STYLES | FCDATA_ALLOW_GRID_FLEX_COLUMN,
+ NS_NewHTMLButtonControlFrame, PseudoStyleType::buttonContent)},
+ SIMPLE_TAG_CHAIN(canvas, nsCSSFrameConstructor::FindCanvasData),
+ SIMPLE_TAG_CREATE(video, NS_NewHTMLVideoFrame),
+ SIMPLE_TAG_CREATE(audio, NS_NewHTMLVideoFrame),
+ SIMPLE_TAG_CREATE(progress, NS_NewProgressFrame),
+ SIMPLE_TAG_CREATE(meter, NS_NewMeterFrame),
+ COMPLEX_TAG_CREATE(details,
+ &nsCSSFrameConstructor::ConstructDetailsFrame)};
+
+ return FindDataByTag(aElement, aStyle, sHTMLData, ArrayLength(sHTMLData));
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindGeneratedImageData(const Element& aElement,
+ ComputedStyle&) {
+ if (!aElement.IsInNativeAnonymousSubtree()) {
+ return nullptr;
+ }
+
+ static const FrameConstructionData sImgData =
+ SIMPLE_FCDATA(NS_NewImageFrameForGeneratedContentIndex);
+ return &sImgData;
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindImgData(const Element& aElement,
+ ComputedStyle& aStyle) {
+ if (!nsImageFrame::ShouldCreateImageFrameFor(aElement, aStyle)) {
+ return nullptr;
+ }
+
+ static const FrameConstructionData sImgData = SIMPLE_FCDATA(NS_NewImageFrame);
+ return &sImgData;
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindImgControlData(const Element& aElement,
+ ComputedStyle& aStyle) {
+ if (!nsImageFrame::ShouldCreateImageFrameFor(aElement, aStyle)) {
+ return nullptr;
+ }
+
+ static const FrameConstructionData sImgControlData =
+ SIMPLE_FCDATA(NS_NewImageControlFrame);
+ return &sImgControlData;
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindSearchControlData(const Element& aElement,
+ ComputedStyle& aStyle) {
+ if (StaticPrefs::layout_forms_input_type_search_enabled()) {
+ static const FrameConstructionData sSearchControlData =
+ SIMPLE_FCDATA(NS_NewSearchControlFrame);
+ return &sSearchControlData;
+ }
+
+ static const FrameConstructionData sTextControlData =
+ SIMPLE_FCDATA(NS_NewTextControlFrame);
+ return &sTextControlData;
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindInputData(const Element& aElement,
+ ComputedStyle& aStyle) {
+ static const FrameConstructionDataByInt sInputData[] = {
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_CHECKBOX, NS_NewCheckboxRadioFrame),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_RADIO, NS_NewCheckboxRadioFrame),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_FILE, NS_NewFileControlFrame),
+ SIMPLE_INT_CHAIN(NS_FORM_INPUT_IMAGE,
+ nsCSSFrameConstructor::FindImgControlData),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_EMAIL, NS_NewTextControlFrame),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_TEXT, NS_NewTextControlFrame),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_TEL, NS_NewTextControlFrame),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_URL, NS_NewTextControlFrame),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_RANGE, NS_NewRangeFrame),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_PASSWORD, NS_NewTextControlFrame),
+ {NS_FORM_INPUT_COLOR,
+ FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewColorControlFrame,
+ PseudoStyleType::buttonContent)},
+
+ SIMPLE_INT_CHAIN(NS_FORM_INPUT_SEARCH,
+ nsCSSFrameConstructor::FindSearchControlData),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_NUMBER, NS_NewNumberControlFrame),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_TIME, NS_NewDateTimeControlFrame),
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_DATE, NS_NewDateTimeControlFrame),
+ // TODO: this is temporary until a frame is written: bug 888320
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_MONTH, NS_NewTextControlFrame),
+ // TODO: this is temporary until a frame is written: bug 888320
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_WEEK, NS_NewTextControlFrame),
+ // TODO: this is temporary until a frame is written: bug 888320
+ SIMPLE_INT_CREATE(NS_FORM_INPUT_DATETIME_LOCAL, NS_NewTextControlFrame),
+ {NS_FORM_INPUT_SUBMIT,
+ FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewGfxButtonControlFrame,
+ PseudoStyleType::buttonContent)},
+ {NS_FORM_INPUT_RESET,
+ FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewGfxButtonControlFrame,
+ PseudoStyleType::buttonContent)},
+ {NS_FORM_INPUT_BUTTON,
+ FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewGfxButtonControlFrame,
+ PseudoStyleType::buttonContent)}
+ // Keeping hidden inputs out of here on purpose for so they get frames by
+ // display (in practice, none).
+ };
+
+ auto controlType = HTMLInputElement::FromNode(aElement)->ControlType();
+
+ // radio and checkbox inputs with appearance:none should be constructed
+ // by display type. (Note that we're not checking that appearance is
+ // not (respectively) StyleAppearance::Radio and StyleAppearance::Checkbox.)
+ if ((controlType == NS_FORM_INPUT_CHECKBOX ||
+ controlType == NS_FORM_INPUT_RADIO) &&
+ !aStyle.StyleDisplay()->HasAppearance()) {
+ return nullptr;
+ }
+
+ return FindDataByInt(controlType, aElement, aStyle, sInputData,
+ ArrayLength(sInputData));
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindObjectData(const Element& aElement,
+ ComputedStyle& aStyle) {
+ // GetDisplayedType isn't necessarily nsIObjectLoadingContent::TYPE_NULL for
+ // cases when the object is broken/suppressed/etc (e.g. a broken image), but
+ // we want to treat those cases as TYPE_NULL
+ uint32_t type;
+ if (aElement.State().HasState(NS_EVENT_STATE_BROKEN)) {
+ type = nsIObjectLoadingContent::TYPE_NULL;
+ } else {
+ nsCOMPtr<nsIObjectLoadingContent> objContent =
+ do_QueryInterface(const_cast<Element*>(&aElement));
+ NS_ASSERTION(objContent,
+ "embed and object must implement "
+ "nsIObjectLoadingContent!");
+
+ objContent->GetDisplayedType(&type);
+ }
+
+ static const FrameConstructionDataByInt sObjectData[] = {
+ SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_LOADING,
+ NS_NewEmptyFrame),
+ SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_PLUGIN,
+ NS_NewObjectFrame),
+ SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_IMAGE, NS_NewImageFrame),
+ SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_DOCUMENT,
+ NS_NewSubDocumentFrame),
+ // Fake plugin handlers load as documents
+ SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_FAKE_PLUGIN,
+ NS_NewSubDocumentFrame)
+ // Nothing for TYPE_NULL so we'll construct frames by display there
+ };
+
+ return FindDataByInt((int32_t)type, aElement, aStyle, sObjectData,
+ ArrayLength(sObjectData));
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindCanvasData(const Element& aElement,
+ ComputedStyle& aStyle) {
+ // We want to check whether script is enabled on the document that
+ // could be painting to the canvas. That's the owner document of
+ // the canvas, except when the owner document is a static document,
+ // in which case it's the original document it was cloned from.
+ Document* doc = aElement.OwnerDoc();
+ if (doc->IsStaticDocument()) {
+ doc = doc->GetOriginalDocument();
+ }
+ if (!doc->IsScriptEnabled()) {
+ return nullptr;
+ }
+
+ static const FrameConstructionData sCanvasData = FCDATA_WITH_WRAPPING_BLOCK(
+ 0, NS_NewHTMLCanvasFrame, PseudoStyleType::htmlCanvasContent);
+ return &sCanvasData;
+}
+
+void nsCSSFrameConstructor::ConstructFrameFromItemInternal(
+ FrameConstructionItem& aItem, nsFrameConstructorState& aState,
+ nsContainerFrame* aParentFrame, nsFrameList& aFrameList) {
+ const FrameConstructionData* data = aItem.mFCData;
+ NS_ASSERTION(data, "Must have frame construction data");
+
+ uint32_t bits = data->mBits;
+
+ NS_ASSERTION(!(bits & FCDATA_FUNC_IS_DATA_GETTER),
+ "Should have dealt with this inside the data finder");
+
+ // Some sets of bits are not compatible with each other
+#define CHECK_ONLY_ONE_BIT(_bit1, _bit2) \
+ NS_ASSERTION(!(bits & _bit1) || !(bits & _bit2), \
+ "Only one of these bits should be set")
+ CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR,
+ FCDATA_FORCE_NULL_ABSPOS_CONTAINER);
+ CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_WRAP_KIDS_IN_BLOCKS);
+ CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_IS_POPUP);
+ CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_SKIP_ABSPOS_PUSH);
+ CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR,
+ FCDATA_DISALLOW_GENERATED_CONTENT);
+ CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_ALLOW_BLOCK_STYLES);
+ CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR,
+ FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS);
+ CHECK_ONLY_ONE_BIT(FCDATA_WRAP_KIDS_IN_BLOCKS,
+ FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS);
+#undef CHECK_ONLY_ONE_BIT
+ NS_ASSERTION(!(bits & FCDATA_FORCED_NON_SCROLLABLE_BLOCK) ||
+ ((bits & FCDATA_FUNC_IS_FULL_CTOR) &&
+ data->mFullConstructor ==
+ &nsCSSFrameConstructor::ConstructNonScrollableBlock),
+ "Unexpected FCDATA_FORCED_NON_SCROLLABLE_BLOCK flag");
+ MOZ_ASSERT(
+ !(bits & FCDATA_IS_WRAPPER_ANON_BOX) || (bits & FCDATA_USE_CHILD_ITEMS),
+ "Wrapper anon boxes should always have FCDATA_USE_CHILD_ITEMS");
+ MOZ_ASSERT(!(bits & FCDATA_ALLOW_GRID_FLEX_COLUMN) ||
+ (bits & FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS),
+ "Need the block wrapper bit to create grid/flex/column.");
+
+ // Don't create a subdocument frame for iframes if we're creating extra frames
+ if (aState.mCreatingExtraFrames &&
+ aItem.mContent->IsHTMLElement(nsGkAtoms::iframe)) {
+ return;
+ }
+
+ nsIContent* const content = aItem.mContent;
+ nsIFrame* newFrame;
+ nsIFrame* primaryFrame;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+ const nsStyleDisplay* display = computedStyle->StyleDisplay();
+ if (bits & FCDATA_FUNC_IS_FULL_CTOR) {
+ newFrame = (this->*(data->mFullConstructor))(aState, aItem, aParentFrame,
+ display, aFrameList);
+ MOZ_ASSERT(newFrame, "Full constructor failed");
+ primaryFrame = newFrame;
+ } else {
+ newFrame = (*data->mFunc.mCreationFunc)(mPresShell, computedStyle);
+
+ bool allowOutOfFlow = !(bits & FCDATA_DISALLOW_OUT_OF_FLOW);
+ bool isPopup = aItem.mIsPopup;
+ NS_ASSERTION(
+ !isPopup || (aState.mPopupList.containingBlock &&
+ aState.mPopupList.containingBlock->IsPopupSetFrame()),
+ "Should have a containing block here!");
+
+ nsContainerFrame* geometricParent =
+ isPopup ? aState.mPopupList.containingBlock
+ : (allowOutOfFlow
+ ? aState.GetGeometricParent(*display, aParentFrame)
+ : aParentFrame);
+
+ // Must init frameToAddToList to null, since it's inout
+ nsIFrame* frameToAddToList = nullptr;
+ if ((bits & FCDATA_MAY_NEED_SCROLLFRAME) &&
+ display->IsScrollableOverflow()) {
+ nsContainerFrame* scrollframe = nullptr;
+ BuildScrollFrame(aState, content, computedStyle, newFrame,
+ geometricParent, scrollframe);
+ frameToAddToList = scrollframe;
+ } else {
+ InitAndRestoreFrame(aState, content, geometricParent, newFrame);
+ frameToAddToList = newFrame;
+ }
+
+ // Use frameToAddToList as the primary frame. In the non-scrollframe case
+ // they're equal, but in the scrollframe case newFrame is the scrolled
+ // frame, while frameToAddToList is the scrollframe (and should be the
+ // primary frame).
+ primaryFrame = frameToAddToList;
+
+ // If we need to create a block formatting context to wrap our
+ // kids, do it now.
+ nsIFrame* maybeAbsoluteContainingBlockStyleFrame = primaryFrame;
+ nsIFrame* maybeAbsoluteContainingBlock = newFrame;
+ nsIFrame* possiblyLeafFrame = newFrame;
+ nsContainerFrame* outerFrame = nullptr;
+ if (bits & FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS) {
+ RefPtr<ComputedStyle> outerStyle =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ data->mAnonBoxPseudo, computedStyle);
+#ifdef DEBUG
+ nsContainerFrame* containerFrame = do_QueryFrame(newFrame);
+ MOZ_ASSERT(containerFrame);
+#endif
+ nsContainerFrame* container = static_cast<nsContainerFrame*>(newFrame);
+ nsContainerFrame* innerFrame;
+ if (bits & FCDATA_ALLOW_GRID_FLEX_COLUMN) {
+ switch (display->DisplayInside()) {
+ case StyleDisplayInside::Flex:
+ outerFrame = NS_NewFlexContainerFrame(mPresShell, outerStyle);
+ InitAndRestoreFrame(aState, content, container, outerFrame);
+ innerFrame = outerFrame;
+ break;
+ case StyleDisplayInside::Grid:
+ outerFrame = NS_NewGridContainerFrame(mPresShell, outerStyle);
+ InitAndRestoreFrame(aState, content, container, outerFrame);
+ innerFrame = outerFrame;
+ break;
+ default: {
+ innerFrame = NS_NewBlockFormattingContext(mPresShell, outerStyle);
+ if (outerStyle->StyleColumn()->IsColumnContainerStyle()) {
+ outerFrame = BeginBuildingColumns(aState, content, container,
+ innerFrame, outerStyle);
+ } else {
+ // No need to create column container. Initialize innerFrame.
+ InitAndRestoreFrame(aState, content, container, innerFrame);
+ outerFrame = innerFrame;
+ }
+ break;
+ }
+ }
+ } else {
+ innerFrame = NS_NewBlockFormattingContext(mPresShell, outerStyle);
+ InitAndRestoreFrame(aState, content, container, innerFrame);
+ outerFrame = innerFrame;
+ }
+
+ SetInitialSingleChild(container, outerFrame);
+
+ container->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+
+ // Now figure out whether newFrame or outerFrame should be the
+ // absolute container.
+ auto outerDisplay = outerStyle->StyleDisplay();
+ if (outerDisplay->IsAbsPosContainingBlock(outerFrame)) {
+ maybeAbsoluteContainingBlock = outerFrame;
+ maybeAbsoluteContainingBlockStyleFrame = outerFrame;
+ innerFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ }
+
+ // Our kids should go into the innerFrame.
+ newFrame = innerFrame;
+ }
+
+ aState.AddChild(frameToAddToList, aFrameList, content, aParentFrame,
+ allowOutOfFlow, allowOutOfFlow, isPopup);
+
+ nsContainerFrame* newFrameAsContainer = do_QueryFrame(newFrame);
+ if (newFrameAsContainer) {
+#ifdef MOZ_XUL
+ // Icky XUL stuff, sadly
+
+ if (aItem.mIsRootPopupgroup) {
+ NS_ASSERTION(nsIPopupContainer::GetPopupContainer(mPresShell) &&
+ nsIPopupContainer::GetPopupContainer(mPresShell)
+ ->GetPopupSetFrame() == newFrame,
+ "Unexpected PopupSetFrame");
+ aState.mPopupList.containingBlock = newFrameAsContainer;
+ aState.mHavePendingPopupgroup = false;
+ }
+#endif /* MOZ_XUL */
+
+ // Process the child content if requested
+ nsFrameList childList;
+ nsFrameConstructorSaveState absoluteSaveState;
+
+ if (bits & FCDATA_FORCE_NULL_ABSPOS_CONTAINER) {
+ aState.PushAbsoluteContainingBlock(nullptr, nullptr, absoluteSaveState);
+ } else if (!(bits & FCDATA_SKIP_ABSPOS_PUSH)) {
+ maybeAbsoluteContainingBlock->AddStateBits(
+ NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ if (maybeAbsoluteContainingBlockStyleFrame->IsAbsPosContainingBlock()) {
+ auto* cf =
+ static_cast<nsContainerFrame*>(maybeAbsoluteContainingBlock);
+ aState.PushAbsoluteContainingBlock(
+ cf, maybeAbsoluteContainingBlockStyleFrame, absoluteSaveState);
+ }
+ }
+
+ if (bits & FCDATA_USE_CHILD_ITEMS) {
+ nsFrameConstructorSaveState floatSaveState;
+
+ if (ShouldSuppressFloatingOfDescendants(newFrame)) {
+ aState.PushFloatContainingBlock(nullptr, floatSaveState);
+ } else if (newFrame->IsFloatContainingBlock()) {
+ aState.PushFloatContainingBlock(newFrameAsContainer, floatSaveState);
+ }
+ ConstructFramesFromItemList(
+ aState, aItem.mChildItems, newFrameAsContainer,
+ bits & FCDATA_IS_WRAPPER_ANON_BOX, childList);
+ } else {
+ // Process the child frames.
+ ProcessChildren(aState, content, computedStyle, newFrameAsContainer,
+ !(bits & FCDATA_DISALLOW_GENERATED_CONTENT), childList,
+ (bits & FCDATA_ALLOW_BLOCK_STYLES) != 0,
+ possiblyLeafFrame);
+ }
+
+ if (bits & FCDATA_WRAP_KIDS_IN_BLOCKS) {
+ nsFrameList newList;
+ nsFrameList currentBlockList;
+ nsIFrame* f;
+ while ((f = childList.FirstChild()) != nullptr) {
+ bool wrapFrame = IsInlineFrame(f) || IsFramePartOfIBSplit(f);
+ if (!wrapFrame) {
+ FlushAccumulatedBlock(aState, content, newFrameAsContainer,
+ currentBlockList, newList);
+ }
+
+ childList.RemoveFrame(f);
+ if (wrapFrame) {
+ currentBlockList.AppendFrame(nullptr, f);
+ } else {
+ newList.AppendFrame(nullptr, f);
+ }
+ }
+ FlushAccumulatedBlock(aState, content, newFrameAsContainer,
+ currentBlockList, newList);
+
+ if (childList.NotEmpty()) {
+ // an error must have occurred, delete unprocessed frames
+ childList.DestroyFrames();
+ }
+
+ childList = newList;
+ }
+
+ if (!(bits & FCDATA_ALLOW_GRID_FLEX_COLUMN) ||
+ !MayNeedToCreateColumnSpanSiblings(newFrameAsContainer, childList)) {
+ // Set the frame's initial child list. Note that MathML depends on this
+ // being called even if childList is empty!
+ newFrameAsContainer->SetInitialChildList(kPrincipalList, childList);
+ } else {
+ // Extract any initial non-column-span kids, and put them in inner
+ // frame's child list.
+ nsFrameList initialNonColumnSpanKids =
+ childList.Split([](nsIFrame* f) { return f->IsColumnSpan(); });
+ newFrameAsContainer->SetInitialChildList(kPrincipalList,
+ initialNonColumnSpanKids);
+
+ if (childList.NotEmpty()) {
+ nsFrameList columnSpanSiblings = CreateColumnSpanSiblings(
+ aState, newFrameAsContainer, childList,
+ // Column content should never be a absolute/fixed positioned
+ // containing block. Pass nullptr as aPositionedFrame.
+ nullptr);
+
+ MOZ_ASSERT(outerFrame,
+ "outerFrame should be non-null if multi-column container "
+ "is created.");
+ FinishBuildingColumns(aState, outerFrame, newFrameAsContainer,
+ columnSpanSiblings);
+ }
+ }
+ }
+ }
+
+ if (computedStyle->GetPseudoType() == PseudoStyleType::marker &&
+ newFrame->IsBulletFrame()) {
+ MOZ_ASSERT(!computedStyle->StyleContent()->ContentCount());
+ auto* node = new nsCounterUseNode(nsCounterUseNode::ForLegacyBullet);
+ auto* list = mCounterManager.CounterListFor(nsGkAtoms::list_item);
+ if (node->InitBullet(list, newFrame)) {
+ CountersDirty();
+ }
+ }
+
+ NS_ASSERTION(newFrame->IsFrameOfType(nsIFrame::eLineParticipant) ==
+ ((bits & FCDATA_IS_LINE_PARTICIPANT) != 0),
+ "Incorrectly set FCDATA_IS_LINE_PARTICIPANT bits");
+
+ // Even if mCreatingExtraFrames is set, we may need to SetPrimaryFrame for
+ // generated content that doesn't have one yet. Note that we have to examine
+ // the frame bit, because by this point mIsGeneratedContent has been cleared
+ // on aItem.
+ if ((!aState.mCreatingExtraFrames ||
+ (aItem.mContent->IsRootOfNativeAnonymousSubtree() &&
+ !aItem.mContent->GetPrimaryFrame())) &&
+ !(bits & FCDATA_SKIP_FRAMESET)) {
+ aItem.mContent->SetPrimaryFrame(primaryFrame);
+ ActiveLayerTracker::TransferActivityToFrame(aItem.mContent, primaryFrame);
+ }
+}
+
+static void GatherSubtreeElements(Element* aElement,
+ nsTArray<Element*>& aElements) {
+ aElements.AppendElement(aElement);
+ StyleChildrenIterator iter(aElement);
+ for (nsIContent* c = iter.GetNextChild(); c; c = iter.GetNextChild()) {
+ if (!c->IsElement()) {
+ continue;
+ }
+ GatherSubtreeElements(c->AsElement(), aElements);
+ }
+}
+
+nsresult nsCSSFrameConstructor::GetAnonymousContent(
+ nsIContent* aParent, nsIFrame* aParentFrame,
+ nsTArray<nsIAnonymousContentCreator::ContentInfo>& aContent) {
+ nsIAnonymousContentCreator* creator = do_QueryFrame(aParentFrame);
+ if (!creator) {
+ return NS_OK;
+ }
+
+ nsresult rv = creator->CreateAnonymousContent(aContent);
+ if (NS_FAILED(rv)) {
+ // CreateAnonymousContent failed, e.g. because the page has a <use> loop.
+ return rv;
+ }
+
+ MOZ_ASSERT(aParent->IsElement());
+ for (const auto& info : aContent) {
+ // get our child's content and set its parent to our content
+ nsIContent* content = info.mContent;
+ content->SetIsNativeAnonymousRoot();
+
+ BindContext context(*aParent->AsElement(), BindContext::ForNativeAnonymous);
+ rv = content->BindToTree(context, *aParent);
+
+ if (NS_FAILED(rv)) {
+ content->UnbindFromTree();
+ return rv;
+ }
+ }
+
+ // Some situations where we don't cache anonymous content styles:
+ //
+ // * when visibility or pointer-events is anything other than the initial
+ // value; we rely on visibility and pointer-events inheriting into anonymous
+ // content, but don't bother adding this state to the AnonymousContentKey,
+ // since it's not so common. Note that on android scrollbars always have
+ // pointer-events: none so we don't need to check for that.
+ //
+ // * when the medium is anything other than screen; some UA style sheet rules
+ // apply in e.g. print medium, and will give different results from the
+ // cached styles
+ bool allowStyleCaching =
+ StaticPrefs::layout_css_cached_scrollbar_styles_enabled() &&
+ aParentFrame->StyleVisibility()->mVisible == StyleVisibility::Visible &&
+#ifndef ANDROID
+ aParentFrame->StyleUI()->mPointerEvents == StylePointerEvents::Auto &&
+#endif
+ mPresShell->GetPresContext()->Medium() == nsGkAtoms::screen;
+
+ // Compute styles for the anonymous content tree.
+ ServoStyleSet* styleSet = mPresShell->StyleSet();
+ for (auto& info : aContent) {
+ Element* e = Element::FromNode(info.mContent);
+ if (!e) {
+ continue;
+ }
+
+ if (info.mKey == AnonymousContentKey::None || !allowStyleCaching) {
+ // Most NAC subtrees do not use caching of computed styles. Just go
+ // ahead and eagerly style the subtree.
+ styleSet->StyleNewSubtree(e);
+ continue;
+ }
+
+ // We have a NAC subtree for which we can use cached styles.
+ AutoTArray<RefPtr<ComputedStyle>, 2> cachedStyles;
+ AutoTArray<Element*, 2> elements;
+
+ GatherSubtreeElements(e, elements);
+ styleSet->GetCachedAnonymousContentStyles(info.mKey, cachedStyles);
+
+ if (cachedStyles.IsEmpty()) {
+ // We haven't stored cached styles for this kind of NAC subtree yet.
+ // Eagerly compute those styles, then cache them for later.
+ styleSet->StyleNewSubtree(e);
+ for (Element* e : elements) {
+ if (e->HasServoData()) {
+ cachedStyles.AppendElement(ServoStyleSet::ResolveServoStyle(*e));
+ } else {
+ cachedStyles.AppendElement(nullptr);
+ }
+ }
+ styleSet->PutCachedAnonymousContentStyles(info.mKey,
+ std::move(cachedStyles));
+ continue;
+ }
+
+ // We previously stored cached styles for this kind of NAC subtree.
+ // Iterate over them and set them on the subtree's elements.
+ MOZ_ASSERT(cachedStyles.Length() == elements.Length(),
+ "should always produce the same size NAC subtree");
+ for (size_t i = 0, len = cachedStyles.Length(); i != len; ++i) {
+ if (cachedStyles[i]) {
+#ifdef DEBUG
+ // Assert that our cached style is the same as one we could compute.
+ RefPtr<ComputedStyle> cs = styleSet->ResolveStyleLazily(*elements[i]);
+ MOZ_ASSERT(
+ cachedStyles[i]->EqualForCachedAnonymousContentStyle(*cs),
+ "cached anonymous content styles should be identical to those we "
+ "would compute normally");
+# ifdef ANDROID
+ MOZ_ASSERT(cs->StyleUI()->mPointerEvents == StylePointerEvents::None);
+# endif
+#endif
+ Servo_SetExplicitStyle(elements[i], cachedStyles[i]);
+ }
+ }
+ }
+
+ return NS_OK;
+}
+
+// XUL frames are not allowed to be out of flow.
+#define SIMPLE_XUL_FCDATA(_func) \
+ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH, _func)
+#define SCROLLABLE_XUL_FCDATA(_func) \
+ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | \
+ FCDATA_MAY_NEED_SCROLLFRAME, \
+ _func)
+// .. but we allow some XUL frames to be _containers_ for out-of-flow content
+// (This is the same as SCROLLABLE_XUL_FCDATA, but w/o FCDATA_SKIP_ABSPOS_PUSH)
+#define SCROLLABLE_ABSPOS_CONTAINER_XUL_FCDATA(_func) \
+ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_MAY_NEED_SCROLLFRAME, _func)
+
+#define SIMPLE_XUL_CREATE(_tag, _func) \
+ { nsGkAtoms::_tag, SIMPLE_XUL_FCDATA(_func) }
+#define SCROLLABLE_XUL_CREATE(_tag, _func) \
+ { nsGkAtoms::_tag, SCROLLABLE_XUL_FCDATA(_func) }
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindXULTagData(const Element& aElement,
+ ComputedStyle& aStyle) {
+ MOZ_ASSERT(aElement.IsXULElement());
+
+ static const FrameConstructionDataByTag sXULTagData[] = {
+#ifdef MOZ_XUL
+ SCROLLABLE_XUL_CREATE(thumb, NS_NewButtonBoxFrame),
+ SCROLLABLE_XUL_CREATE(checkbox, NS_NewButtonBoxFrame),
+ SCROLLABLE_XUL_CREATE(radio, NS_NewButtonBoxFrame),
+ SCROLLABLE_XUL_CREATE(titlebar, NS_NewTitleBarFrame),
+ SCROLLABLE_XUL_CREATE(resizer, NS_NewResizerFrame),
+ SCROLLABLE_XUL_CREATE(toolbarpaletteitem, NS_NewBoxFrame),
+ SCROLLABLE_XUL_CREATE(treecolpicker, NS_NewButtonBoxFrame),
+ SIMPLE_XUL_CREATE(image, NS_NewImageBoxFrame),
+ SIMPLE_XUL_CREATE(spacer, NS_NewLeafBoxFrame),
+ SIMPLE_XUL_CREATE(treechildren, NS_NewTreeBodyFrame),
+ SIMPLE_XUL_CREATE(treecol, NS_NewTreeColFrame),
+ SIMPLE_TAG_CHAIN(button, nsCSSFrameConstructor::FindXULButtonData),
+ SIMPLE_TAG_CHAIN(toolbarbutton, nsCSSFrameConstructor::FindXULButtonData),
+ SIMPLE_TAG_CHAIN(label, nsCSSFrameConstructor::FindXULLabelData),
+ SIMPLE_TAG_CHAIN(description,
+ nsCSSFrameConstructor::FindXULDescriptionData),
+ SIMPLE_XUL_CREATE(menu, NS_NewMenuFrame),
+ SIMPLE_XUL_CREATE(menulist, NS_NewMenuFrame),
+ SIMPLE_XUL_CREATE(menuitem, NS_NewMenuItemFrame),
+# ifdef XP_MACOSX
+ SIMPLE_TAG_CHAIN(menubar, nsCSSFrameConstructor::FindXULMenubarData),
+# else
+ SIMPLE_XUL_CREATE(menubar, NS_NewMenuBarFrame),
+# endif /* XP_MACOSX */
+ SIMPLE_TAG_CHAIN(popupgroup, nsCSSFrameConstructor::FindPopupGroupData),
+ SIMPLE_XUL_CREATE(iframe, NS_NewSubDocumentFrame),
+ SIMPLE_XUL_CREATE(editor, NS_NewSubDocumentFrame),
+ SIMPLE_XUL_CREATE(browser, NS_NewSubDocumentFrame),
+ SIMPLE_XUL_CREATE(splitter, NS_NewSplitterFrame),
+#endif /* MOZ_XUL */
+ SIMPLE_XUL_CREATE(slider, NS_NewSliderFrame),
+ SIMPLE_XUL_CREATE(scrollbar, NS_NewScrollbarFrame),
+ SIMPLE_XUL_CREATE(scrollbarbutton, NS_NewScrollbarButtonFrame)};
+
+ return FindDataByTag(aElement, aStyle, sXULTagData, ArrayLength(sXULTagData));
+}
+
+#ifdef MOZ_XUL
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindPopupGroupData(const Element& aElement,
+ ComputedStyle&) {
+ if (!aElement.IsRootOfNativeAnonymousSubtree()) {
+ return nullptr;
+ }
+
+ static const FrameConstructionData sPopupSetData =
+ SIMPLE_XUL_FCDATA(NS_NewPopupSetFrame);
+ return &sPopupSetData;
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData
+ nsCSSFrameConstructor::sXULTextBoxData =
+ SIMPLE_XUL_FCDATA(NS_NewTextBoxFrame);
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindXULButtonData(const Element& aElement,
+ ComputedStyle&) {
+ static const FrameConstructionData sXULMenuData =
+ SIMPLE_XUL_FCDATA(NS_NewMenuFrame);
+ if (aElement.AttrValueIs(kNameSpaceID_None, nsGkAtoms::type, nsGkAtoms::menu,
+ eCaseMatters)) {
+ return &sXULMenuData;
+ }
+
+# ifdef MOZ_THUNDERBIRD
+ if (aElement.AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+ u"menu-button"_ns, eCaseMatters)) {
+ return &sXULMenuData;
+ }
+# endif
+
+ static const FrameConstructionData sXULButtonData =
+ SCROLLABLE_XUL_FCDATA(NS_NewButtonBoxFrame);
+ return &sXULButtonData;
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindXULLabelData(const Element& aElement,
+ ComputedStyle&) {
+ if (aElement.HasAttr(kNameSpaceID_None, nsGkAtoms::value)) {
+ return &sXULTextBoxData;
+ }
+
+ static const FrameConstructionData sLabelData =
+ SIMPLE_XUL_FCDATA(NS_NewXULLabelFrame);
+ return &sLabelData;
+}
+
+static nsIFrame* NS_NewXULDescriptionFrame(PresShell* aPresShell,
+ ComputedStyle* aContext) {
+ // XXXbz do we really need to set up the block formatting context root? If the
+ // parent is not a block we'll get it anyway, and if it is, do we want it?
+ return NS_NewBlockFormattingContext(aPresShell, aContext);
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindXULDescriptionData(const Element& aElement,
+ ComputedStyle&) {
+ if (aElement.HasAttr(kNameSpaceID_None, nsGkAtoms::value)) {
+ return &sXULTextBoxData;
+ }
+
+ static const FrameConstructionData sDescriptionData =
+ SIMPLE_XUL_FCDATA(NS_NewXULDescriptionFrame);
+ return &sDescriptionData;
+}
+
+# ifdef XP_MACOSX
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindXULMenubarData(const Element& aElement,
+ ComputedStyle&) {
+ if (aElement.OwnerDoc()->IsInChromeDocShell()) {
+ BrowsingContext* bc = aElement.OwnerDoc()->GetBrowsingContext();
+ bool isRoot = bc && !bc->GetParent();
+ if (isRoot) {
+ // This is the root. Suppress the menubar, since on Mac
+ // window menus are not attached to the window.
+ static const FrameConstructionData sSuppressData = SUPPRESS_FCDATA();
+ return &sSuppressData;
+ }
+ }
+
+ static const FrameConstructionData sMenubarData =
+ SIMPLE_XUL_FCDATA(NS_NewMenuBarFrame);
+ return &sMenubarData;
+}
+# endif /* XP_MACOSX */
+
+#endif /* MOZ_XUL */
+
+already_AddRefed<ComputedStyle> nsCSSFrameConstructor::BeginBuildingScrollFrame(
+ nsFrameConstructorState& aState, nsIContent* aContent,
+ ComputedStyle* aContentStyle, nsContainerFrame* aParentFrame,
+ PseudoStyleType aScrolledPseudo, bool aIsRoot,
+ nsContainerFrame*& aNewFrame) {
+ nsContainerFrame* gfxScrollFrame = aNewFrame;
+
+ nsFrameList anonymousList;
+
+ RefPtr<ComputedStyle> contentStyle = aContentStyle;
+
+ if (!gfxScrollFrame) {
+ // Build a XULScrollFrame when the child is a box, otherwise an
+ // HTMLScrollFrame
+ const nsStyleDisplay* displayStyle = aContentStyle->StyleDisplay();
+ if (displayStyle->IsXULDisplayStyle()) {
+ gfxScrollFrame = NS_NewXULScrollFrame(
+ mPresShell, contentStyle, aIsRoot,
+ displayStyle->mDisplay == StyleDisplay::MozStack);
+ } else {
+ gfxScrollFrame = NS_NewHTMLScrollFrame(mPresShell, contentStyle, aIsRoot);
+ }
+
+ InitAndRestoreFrame(aState, aContent, aParentFrame, gfxScrollFrame);
+ }
+
+ MOZ_ASSERT(gfxScrollFrame);
+
+ // if there are any anonymous children for the scroll frame, create
+ // frames for them.
+ //
+ // We can't take the normal ProcessChildren path, because the NAC needs to
+ // be parented to the scrollframe, and everything else needs to be parented
+ // to the scrolledframe.
+ AutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> scrollNAC;
+ DebugOnly<nsresult> rv =
+ GetAnonymousContent(aContent, gfxScrollFrame, scrollNAC);
+ MOZ_ASSERT(NS_SUCCEEDED(rv));
+ if (scrollNAC.Length() > 0) {
+ AutoFrameConstructionItemList items(this);
+ AddFCItemsForAnonymousContent(aState, gfxScrollFrame, scrollNAC, items);
+ ConstructFramesFromItemList(aState, items, gfxScrollFrame,
+ /* aParentIsWrapperAnonBox = */ false,
+ anonymousList);
+ }
+
+ aNewFrame = gfxScrollFrame;
+ gfxScrollFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+
+ // we used the style that was passed in. So resolve another one.
+ ServoStyleSet* styleSet = mPresShell->StyleSet();
+ RefPtr<ComputedStyle> scrolledChildStyle =
+ styleSet->ResolveInheritingAnonymousBoxStyle(aScrolledPseudo,
+ contentStyle);
+
+ gfxScrollFrame->SetInitialChildList(kPrincipalList, anonymousList);
+
+ return scrolledChildStyle.forget();
+}
+
+void nsCSSFrameConstructor::FinishBuildingScrollFrame(
+ nsContainerFrame* aScrollFrame, nsIFrame* aScrolledFrame) {
+ nsFrameList scrolled(aScrolledFrame, aScrolledFrame);
+ aScrollFrame->AppendFrames(kPrincipalList, scrolled);
+}
+
+/**
+ * Called to wrap a gfx scrollframe around a frame. The hierarchy will look like
+ * this
+ *
+ * ------- for gfx scrollbars ------
+ *
+ *
+ * ScrollFrame
+ * ^
+ * |
+ * Frame (scrolled frame you passed in)
+ *
+ *
+ * -----------------------------------
+ * LEGEND:
+ *
+ * ScrollFrame: This is a frame that manages gfx cross platform frame based
+ * scrollbars.
+ *
+ * @param aContent the content node of the child to wrap.
+ *
+ * @param aScrolledFrame The frame of the content to wrap. This should not be
+ * Initialized. This method will initialize it with a scrolled pseudo and no
+ * nsIContent. The content will be attached to the scrollframe returned.
+ *
+ * @param aContentStyle the style that has already been resolved for the content
+ * being passed in.
+ *
+ * @param aParentFrame The parent to attach the scroll frame to
+ *
+ * @param aNewFrame The new scrollframe or gfx scrollframe that we create. It
+ * will contain the scrolled frame you passed in. (returned) If this is not
+ * null, we'll just use it
+ *
+ * @param aScrolledContentStyle the style that was resolved for the scrolled
+ * frame. (returned)
+ */
+void nsCSSFrameConstructor::BuildScrollFrame(nsFrameConstructorState& aState,
+ nsIContent* aContent,
+ ComputedStyle* aContentStyle,
+ nsIFrame* aScrolledFrame,
+ nsContainerFrame* aParentFrame,
+ nsContainerFrame*& aNewFrame) {
+ RefPtr<ComputedStyle> scrolledContentStyle = BeginBuildingScrollFrame(
+ aState, aContent, aContentStyle, aParentFrame,
+ PseudoStyleType::scrolledContent, false, aNewFrame);
+
+ aScrolledFrame->SetComputedStyleWithoutNotification(scrolledContentStyle);
+ InitAndRestoreFrame(aState, aContent, aNewFrame, aScrolledFrame);
+
+ FinishBuildingScrollFrame(aNewFrame, aScrolledFrame);
+}
+
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindDisplayData(const nsStyleDisplay& aDisplay,
+ const Element& aElement) {
+ static_assert(eParentTypeCount < (1 << (32 - FCDATA_PARENT_TYPE_OFFSET)),
+ "Check eParentTypeCount should not overflow");
+
+ // The style system ensures that floated and positioned frames are
+ // block-level.
+ NS_ASSERTION(
+ !(aDisplay.IsFloatingStyle() || aDisplay.IsAbsolutelyPositionedStyle()) ||
+ aDisplay.IsBlockOutsideStyle() || aDisplay.IsXULDisplayStyle(),
+ "Style system did not apply CSS2.1 section 9.7 fixups");
+
+ // If this is "body", try propagating its scroll style to the viewport
+ // Note that we need to do this even if the body is NOT scrollable;
+ // it might have dynamically changed from scrollable to not scrollable,
+ // and that might need to be propagated.
+ // XXXbz is this the right place to do this? If this code moves,
+ // make this function static.
+ bool propagatedScrollToViewport = false;
+ if (aElement.IsHTMLElement(nsGkAtoms::body)) {
+ if (nsPresContext* presContext = mPresShell->GetPresContext()) {
+ propagatedScrollToViewport =
+ presContext->UpdateViewportScrollStylesOverride() == &aElement;
+ MOZ_ASSERT(!propagatedScrollToViewport ||
+ !mPresShell->GetPresContext()->IsPaginated(),
+ "Shouldn't propagate scroll in paginated contexts");
+ }
+ }
+
+ switch (aDisplay.DisplayInside()) {
+ case StyleDisplayInside::Flow:
+ case StyleDisplayInside::FlowRoot: {
+ if (aDisplay.IsInlineFlow()) {
+ static const FrameConstructionData data =
+ FULL_CTOR_FCDATA(FCDATA_IS_INLINE | FCDATA_IS_LINE_PARTICIPANT,
+ &nsCSSFrameConstructor::ConstructInline);
+ return &data;
+ }
+
+ // If the frame is a block-level frame and is scrollable, then wrap it in
+ // a scroll frame. Except we don't want to do that for paginated contexts
+ // for frames that are block-outside and aren't frames for native
+ // anonymous stuff.
+ // XXX Ignore tables for the time being (except caption)
+ const uint32_t kCaptionCtorFlags =
+ FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable);
+ bool caption = aDisplay.mDisplay == StyleDisplay::TableCaption;
+ bool suppressScrollFrame = false;
+ bool needScrollFrame =
+ aDisplay.IsScrollableOverflow() && !propagatedScrollToViewport;
+ if (needScrollFrame) {
+ suppressScrollFrame = mPresShell->GetPresContext()->IsPaginated() &&
+ aDisplay.IsBlockOutsideStyle() &&
+ !aElement.IsInNativeAnonymousSubtree();
+ if (!suppressScrollFrame) {
+ static const FrameConstructionData sScrollableBlockData[2] = {
+ FULL_CTOR_FCDATA(
+ 0, &nsCSSFrameConstructor::ConstructScrollableBlock),
+ FULL_CTOR_FCDATA(
+ kCaptionCtorFlags,
+ &nsCSSFrameConstructor::ConstructScrollableBlock)};
+ return &sScrollableBlockData[caption];
+ }
+
+ // If the scrollable frame would have propagated its scrolling to the
+ // viewport, we still want to construct a regular block rather than a
+ // scrollframe so that it paginates correctly, but we don't want to set
+ // the bit on the block that tells it to clip at paint time.
+ if (mPresShell->GetPresContext()->ElementWouldPropagateScrollStyles(
+ aElement)) {
+ suppressScrollFrame = false;
+ }
+ }
+
+ // Handle various non-scrollable blocks.
+ static const FrameConstructionData sNonScrollableBlockData[2][2] = {
+ {FULL_CTOR_FCDATA(
+ 0, &nsCSSFrameConstructor::ConstructNonScrollableBlock),
+ FULL_CTOR_FCDATA(
+ kCaptionCtorFlags,
+ &nsCSSFrameConstructor::ConstructNonScrollableBlock)},
+ {FULL_CTOR_FCDATA(
+ FCDATA_FORCED_NON_SCROLLABLE_BLOCK,
+ &nsCSSFrameConstructor::ConstructNonScrollableBlock),
+ FULL_CTOR_FCDATA(
+ FCDATA_FORCED_NON_SCROLLABLE_BLOCK | kCaptionCtorFlags,
+ &nsCSSFrameConstructor::ConstructNonScrollableBlock)}};
+ return &sNonScrollableBlockData[suppressScrollFrame][caption];
+ }
+ case StyleDisplayInside::Table: {
+ static const FrameConstructionData data =
+ FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructTable);
+ return &data;
+ }
+ // NOTE: In the unlikely event that we add another table-part here that
+ // has a desired-parent-type (& hence triggers table fixup), we'll need to
+ // also update the flexbox chunk in ComputedStyle::ApplyStyleFixups().
+ case StyleDisplayInside::TableRowGroup: {
+ static const FrameConstructionData data = FULL_CTOR_FCDATA(
+ FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
+ &nsCSSFrameConstructor::ConstructTableRowOrRowGroup);
+ return &data;
+ }
+ case StyleDisplayInside::TableColumn: {
+ static const FrameConstructionData data = FULL_CTOR_FCDATA(
+ FCDATA_IS_TABLE_PART |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeColGroup),
+ &nsCSSFrameConstructor::ConstructTableCol);
+ return &data;
+ }
+ case StyleDisplayInside::TableColumnGroup: {
+ static const FrameConstructionData data =
+ FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW |
+ FCDATA_SKIP_ABSPOS_PUSH |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
+ NS_NewTableColGroupFrame);
+ return &data;
+ }
+ case StyleDisplayInside::TableHeaderGroup: {
+ static const FrameConstructionData data = FULL_CTOR_FCDATA(
+ FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
+ &nsCSSFrameConstructor::ConstructTableRowOrRowGroup);
+ return &data;
+ }
+ case StyleDisplayInside::TableFooterGroup: {
+ static const FrameConstructionData data = FULL_CTOR_FCDATA(
+ FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
+ &nsCSSFrameConstructor::ConstructTableRowOrRowGroup);
+ return &data;
+ }
+ case StyleDisplayInside::TableRow: {
+ static const FrameConstructionData data = FULL_CTOR_FCDATA(
+ FCDATA_IS_TABLE_PART |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRowGroup),
+ &nsCSSFrameConstructor::ConstructTableRowOrRowGroup);
+ return &data;
+ }
+ case StyleDisplayInside::TableCell: {
+ static const FrameConstructionData data = FULL_CTOR_FCDATA(
+ FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRow),
+ &nsCSSFrameConstructor::ConstructTableCell);
+ return &data;
+ }
+ case StyleDisplayInside::MozBox: {
+ if (!aElement.IsInNativeAnonymousSubtree() &&
+ aElement.OwnerDoc()->IsContentDocument()) {
+ aElement.OwnerDoc()->WarnOnceAbout(
+ DeprecatedOperations::eMozBoxOrInlineBoxDisplay);
+ }
+
+ // If we're emulating -moz-box with flexbox, then treat it as non-XUL and
+ // fall through (except for scrollcorners which have to be XUL becuase
+ // their parent reflows them with BoxReflow() which means they have to get
+ // actual-XUL frames).
+ if (!StaticPrefs::layout_css_emulate_moz_box_with_flex() ||
+ aElement.IsXULElement(nsGkAtoms::scrollcorner)) {
+ static const FrameConstructionData data =
+ SCROLLABLE_ABSPOS_CONTAINER_XUL_FCDATA(NS_NewBoxFrame);
+ return &data;
+ }
+ [[fallthrough]];
+ }
+ case StyleDisplayInside::Flex:
+ case StyleDisplayInside::WebkitBox: {
+ static const FrameConstructionData nonScrollableData =
+ FCDATA_DECL(0, NS_NewFlexContainerFrame);
+ static const FrameConstructionData data =
+ FCDATA_DECL(FCDATA_MAY_NEED_SCROLLFRAME, NS_NewFlexContainerFrame);
+ return MOZ_UNLIKELY(propagatedScrollToViewport) ? &nonScrollableData
+ : &data;
+ }
+ case StyleDisplayInside::Grid: {
+ static const FrameConstructionData nonScrollableData =
+ FCDATA_DECL(0, NS_NewGridContainerFrame);
+ static const FrameConstructionData data =
+ FCDATA_DECL(FCDATA_MAY_NEED_SCROLLFRAME, NS_NewGridContainerFrame);
+ return MOZ_UNLIKELY(propagatedScrollToViewport) ? &nonScrollableData
+ : &data;
+ }
+ case StyleDisplayInside::Ruby: {
+ static const FrameConstructionData data[] = {
+ FULL_CTOR_FCDATA(FCDATA_MAY_NEED_SCROLLFRAME,
+ &nsCSSFrameConstructor::ConstructBlockRubyFrame),
+ FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT, NS_NewRubyFrame),
+ };
+ bool isInline = aDisplay.DisplayOutside() == StyleDisplayOutside::Inline;
+ return &data[isInline];
+ }
+ case StyleDisplayInside::RubyBase: {
+ static const FrameConstructionData data = FCDATA_DECL(
+ FCDATA_IS_LINE_PARTICIPANT |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRubyBaseContainer),
+ NS_NewRubyBaseFrame);
+ return &data;
+ }
+ case StyleDisplayInside::RubyBaseContainer: {
+ static const FrameConstructionData data =
+ FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRuby),
+ NS_NewRubyBaseContainerFrame);
+ return &data;
+ }
+ case StyleDisplayInside::RubyText: {
+ static const FrameConstructionData data = FCDATA_DECL(
+ FCDATA_IS_LINE_PARTICIPANT |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRubyTextContainer),
+ NS_NewRubyTextFrame);
+ return &data;
+ }
+ case StyleDisplayInside::RubyTextContainer: {
+ static const FrameConstructionData data =
+ FCDATA_DECL(FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRuby),
+ NS_NewRubyTextContainerFrame);
+ return &data;
+ }
+#ifdef MOZ_XUL
+ case StyleDisplayInside::MozStack: {
+ static const FrameConstructionData data =
+ SCROLLABLE_XUL_FCDATA(NS_NewStackFrame);
+ return &data;
+ }
+ case StyleDisplayInside::MozDeck: {
+ static const FrameConstructionData data =
+ SIMPLE_XUL_FCDATA(NS_NewDeckFrame);
+ return &data;
+ }
+ case StyleDisplayInside::MozPopup: {
+ static const FrameConstructionData data =
+ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_IS_POPUP |
+ FCDATA_SKIP_ABSPOS_PUSH,
+ NS_NewMenuPopupFrame);
+ return &data;
+ }
+#endif /* MOZ_XUL */
+ default:
+ MOZ_ASSERT_UNREACHABLE("unknown 'display' value");
+ return nullptr;
+ }
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructScrollableBlock(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList) {
+ return ConstructScrollableBlockWithConstructor(aState, aItem, aParentFrame,
+ aDisplay, aFrameList,
+ NS_NewBlockFormattingContext);
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructScrollableBlockWithConstructor(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList, BlockFrameCreationFunc aConstructor) {
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+
+ nsContainerFrame* newFrame = nullptr;
+ RefPtr<ComputedStyle> scrolledContentStyle = BeginBuildingScrollFrame(
+ aState, content, computedStyle,
+ aState.GetGeometricParent(*aDisplay, aParentFrame),
+ PseudoStyleType::scrolledContent, false, newFrame);
+
+ // Create our block frame
+ // pass a temporary stylecontext, the correct one will be set later
+ nsContainerFrame* scrolledFrame = aConstructor(mPresShell, computedStyle);
+
+ // Make sure to AddChild before we call ConstructBlock so that we
+ // end up before our descendants in fixed-pos lists as needed.
+ aState.AddChild(newFrame, aFrameList, content, aParentFrame);
+
+ nsFrameList blockList;
+ ConstructBlock(
+ aState, content, newFrame, newFrame, scrolledContentStyle, &scrolledFrame,
+ blockList,
+ aDisplay->IsAbsPosContainingBlock(newFrame) ? newFrame : nullptr);
+
+ MOZ_ASSERT(blockList.OnlyChild() == scrolledFrame,
+ "Scrollframe's frameList should be exactly the scrolled frame!");
+ FinishBuildingScrollFrame(newFrame, scrolledFrame);
+
+ return newFrame;
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructNonScrollableBlock(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList) {
+ return ConstructNonScrollableBlockWithConstructor(
+ aState, aItem, aParentFrame, aDisplay, aFrameList, NS_NewBlockFrame);
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructNonScrollableBlockWithConstructor(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList, BlockFrameCreationFunc aConstructor) {
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+
+ // We want a block formatting context root in paginated contexts for
+ // every block that would be scrollable in a non-paginated context.
+ // We mark our blocks with a bit here if this condition is true, so
+ // we can check it later in nsIFrame::ApplyPaginatedOverflowClipping.
+ bool clipPaginatedOverflow =
+ (aItem.mFCData->mBits & FCDATA_FORCED_NON_SCROLLABLE_BLOCK) != 0;
+ nsFrameState flags = nsFrameState(0);
+ if ((aDisplay->IsAbsolutelyPositionedStyle() || aDisplay->IsFloatingStyle() ||
+ aDisplay->DisplayInside() == StyleDisplayInside::FlowRoot ||
+ clipPaginatedOverflow) &&
+ !SVGUtils::IsInSVGTextSubtree(aParentFrame)) {
+ flags = NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS;
+ if (clipPaginatedOverflow) {
+ flags |= NS_BLOCK_CLIP_PAGINATED_OVERFLOW;
+ }
+ }
+
+ nsContainerFrame* newFrame = aConstructor(mPresShell, computedStyle);
+ newFrame->AddStateBits(flags);
+ ConstructBlock(
+ aState, aItem.mContent,
+ aState.GetGeometricParent(*aDisplay, aParentFrame), aParentFrame,
+ computedStyle, &newFrame, aFrameList,
+ aDisplay->IsAbsPosContainingBlock(newFrame) ? newFrame : nullptr);
+ return newFrame;
+}
+
+void nsCSSFrameConstructor::InitAndRestoreFrame(
+ const nsFrameConstructorState& aState, nsIContent* aContent,
+ nsContainerFrame* aParentFrame, nsIFrame* aNewFrame, bool aAllowCounters) {
+ MOZ_ASSERT(aNewFrame, "Null frame cannot be initialized");
+
+ // Initialize the frame
+ aNewFrame->Init(aContent, aParentFrame, nullptr);
+ aNewFrame->AddStateBits(aState.mAdditionalStateBits);
+
+ if (aState.mFrameState) {
+ // Restore frame state for just the newly created frame.
+ RestoreFrameStateFor(aNewFrame, aState.mFrameState);
+ }
+
+ if (aAllowCounters && mCounterManager.AddCounterChanges(aNewFrame)) {
+ CountersDirty();
+ }
+}
+
+already_AddRefed<ComputedStyle> nsCSSFrameConstructor::ResolveComputedStyle(
+ nsIContent* aContent) {
+ if (auto* element = Element::FromNode(aContent)) {
+ return ServoStyleSet::ResolveServoStyle(*element);
+ }
+
+ MOZ_ASSERT(aContent->IsText(),
+ "shouldn't waste time creating ComputedStyles for "
+ "comments and processing instructions");
+
+ Element* parent = aContent->GetFlattenedTreeParentElement();
+ MOZ_ASSERT(parent, "Text out of the flattened tree?");
+
+ // FIXME(emilio): The const_cast is unfortunate, but it's not worse than what
+ // we did before.
+ //
+ // We could use ResolveServoStyle, but that would involve extra unnecessary
+ // refcount traffic...
+ auto* parentStyle =
+ const_cast<ComputedStyle*>(Servo_Element_GetMaybeOutOfDateStyle(parent));
+ MOZ_ASSERT(parentStyle,
+ "How are we inserting text frames in an unstyled element?");
+ return mPresShell->StyleSet()->ResolveStyleForText(aContent, parentStyle);
+}
+
+// MathML Mod - RBS
+void nsCSSFrameConstructor::FlushAccumulatedBlock(
+ nsFrameConstructorState& aState, nsIContent* aContent,
+ nsContainerFrame* aParentFrame, nsFrameList& aBlockList,
+ nsFrameList& aNewList) {
+ if (aBlockList.IsEmpty()) {
+ // Nothing to do
+ return;
+ }
+
+ auto anonPseudo = PseudoStyleType::mozMathMLAnonymousBlock;
+
+ ComputedStyle* parentContext =
+ nsIFrame::CorrectStyleParentFrame(aParentFrame, anonPseudo)->Style();
+ ServoStyleSet* styleSet = mPresShell->StyleSet();
+ RefPtr<ComputedStyle> blockContext;
+ blockContext =
+ styleSet->ResolveInheritingAnonymousBoxStyle(anonPseudo, parentContext);
+
+ // then, create a block frame that will wrap the child frames. Make it a
+ // MathML frame so that Get(Absolute/Float)ContainingBlockFor know that this
+ // is not a suitable block.
+ nsContainerFrame* blockFrame =
+ NS_NewMathMLmathBlockFrame(mPresShell, blockContext);
+
+ InitAndRestoreFrame(aState, aContent, aParentFrame, blockFrame);
+ ReparentFrames(this, blockFrame, aBlockList, false);
+ // We have to walk over aBlockList before we hand it over to blockFrame.
+ for (nsIFrame* f : aBlockList) {
+ f->SetParentIsWrapperAnonBox();
+ }
+ // abs-pos and floats are disabled in MathML children so we don't have to
+ // worry about messing up those.
+ blockFrame->SetInitialChildList(kPrincipalList, aBlockList);
+ NS_ASSERTION(aBlockList.IsEmpty(), "What happened?");
+ aBlockList.Clear();
+ aNewList.AppendFrame(nullptr, blockFrame);
+}
+
+// Only <math> elements can be floated or positioned. All other MathML
+// should be in-flow.
+#define SIMPLE_MATHML_CREATE(_tag, _func) \
+ { \
+ nsGkAtoms::_tag, FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | \
+ FCDATA_FORCE_NULL_ABSPOS_CONTAINER | \
+ FCDATA_WRAP_KIDS_IN_BLOCKS, \
+ _func) \
+ }
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindMathMLData(const Element& aElement,
+ ComputedStyle& aStyle) {
+ MOZ_ASSERT(aElement.IsMathMLElement());
+
+ nsAtom* tag = aElement.NodeInfo()->NameAtom();
+
+ // Handle <math> specially, because it sometimes produces inlines
+ if (tag == nsGkAtoms::math) {
+ // The IsBlockOutsideStyle() check must match what
+ // specified::Display::equivalent_block_display is checking for
+ // already-block-outside things. Though the behavior here for the
+ // display:table case is pretty weird...
+ if (aStyle.StyleDisplay()->IsBlockOutsideStyle()) {
+ static const FrameConstructionData sBlockMathData = FCDATA_DECL(
+ FCDATA_FORCE_NULL_ABSPOS_CONTAINER | FCDATA_WRAP_KIDS_IN_BLOCKS,
+ NS_NewMathMLmathBlockFrame);
+ return &sBlockMathData;
+ }
+
+ static const FrameConstructionData sInlineMathData =
+ FCDATA_DECL(FCDATA_FORCE_NULL_ABSPOS_CONTAINER |
+ FCDATA_IS_LINE_PARTICIPANT | FCDATA_WRAP_KIDS_IN_BLOCKS,
+ NS_NewMathMLmathInlineFrame);
+ return &sInlineMathData;
+ }
+
+ static const FrameConstructionDataByTag sMathMLData[] = {
+ SIMPLE_MATHML_CREATE(annotation_, NS_NewMathMLTokenFrame),
+ SIMPLE_MATHML_CREATE(annotation_xml_, NS_NewMathMLmrowFrame),
+ SIMPLE_MATHML_CREATE(mi_, NS_NewMathMLTokenFrame),
+ SIMPLE_MATHML_CREATE(mn_, NS_NewMathMLTokenFrame),
+ SIMPLE_MATHML_CREATE(ms_, NS_NewMathMLTokenFrame),
+ SIMPLE_MATHML_CREATE(mtext_, NS_NewMathMLTokenFrame),
+ SIMPLE_MATHML_CREATE(mo_, NS_NewMathMLmoFrame),
+ SIMPLE_MATHML_CREATE(mfrac_, NS_NewMathMLmfracFrame),
+ SIMPLE_MATHML_CREATE(msup_, NS_NewMathMLmmultiscriptsFrame),
+ SIMPLE_MATHML_CREATE(msub_, NS_NewMathMLmmultiscriptsFrame),
+ SIMPLE_MATHML_CREATE(msubsup_, NS_NewMathMLmmultiscriptsFrame),
+ SIMPLE_MATHML_CREATE(munder_, NS_NewMathMLmunderoverFrame),
+ SIMPLE_MATHML_CREATE(mover_, NS_NewMathMLmunderoverFrame),
+ SIMPLE_MATHML_CREATE(munderover_, NS_NewMathMLmunderoverFrame),
+ SIMPLE_MATHML_CREATE(mphantom_, NS_NewMathMLmrowFrame),
+ SIMPLE_MATHML_CREATE(mpadded_, NS_NewMathMLmpaddedFrame),
+ SIMPLE_MATHML_CREATE(mspace_, NS_NewMathMLmspaceFrame),
+ SIMPLE_MATHML_CREATE(none, NS_NewMathMLmspaceFrame),
+ SIMPLE_MATHML_CREATE(mprescripts_, NS_NewMathMLmspaceFrame),
+ SIMPLE_MATHML_CREATE(mfenced_, NS_NewMathMLmrowFrame),
+ SIMPLE_MATHML_CREATE(mmultiscripts_, NS_NewMathMLmmultiscriptsFrame),
+ SIMPLE_MATHML_CREATE(mstyle_, NS_NewMathMLmrowFrame),
+ SIMPLE_MATHML_CREATE(msqrt_, NS_NewMathMLmsqrtFrame),
+ SIMPLE_MATHML_CREATE(mroot_, NS_NewMathMLmrootFrame),
+ SIMPLE_MATHML_CREATE(maction_, NS_NewMathMLmactionFrame),
+ SIMPLE_MATHML_CREATE(mrow_, NS_NewMathMLmrowFrame),
+ SIMPLE_MATHML_CREATE(merror_, NS_NewMathMLmrowFrame),
+ SIMPLE_MATHML_CREATE(menclose_, NS_NewMathMLmencloseFrame),
+ SIMPLE_MATHML_CREATE(semantics_, NS_NewMathMLsemanticsFrame)};
+
+ return FindDataByTag(aElement, aStyle, sMathMLData, ArrayLength(sMathMLData));
+}
+
+nsContainerFrame* nsCSSFrameConstructor::ConstructFrameWithAnonymousChild(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, nsFrameList& aFrameList,
+ ContainerFrameCreationFunc aConstructor,
+ ContainerFrameCreationFunc aInnerConstructor, PseudoStyleType aInnerPseudo,
+ bool aCandidateRootFrame) {
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+
+ // Create the outer frame:
+ nsContainerFrame* newFrame = aConstructor(mPresShell, computedStyle);
+
+ InitAndRestoreFrame(aState, content,
+ aCandidateRootFrame
+ ? aState.GetGeometricParent(
+ *computedStyle->StyleDisplay(), aParentFrame)
+ : aParentFrame,
+ newFrame);
+ newFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+
+ // Create the pseudo SC for the anonymous wrapper child as a child of the SC:
+ RefPtr<ComputedStyle> scForAnon;
+ scForAnon = mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ aInnerPseudo, computedStyle);
+
+ // Create the anonymous inner wrapper frame
+ nsContainerFrame* innerFrame = aInnerConstructor(mPresShell, scForAnon);
+
+ InitAndRestoreFrame(aState, content, newFrame, innerFrame);
+
+ // Put the newly created frames into the right child list
+ SetInitialSingleChild(newFrame, innerFrame);
+
+ aState.AddChild(newFrame, aFrameList, content, aParentFrame,
+ aCandidateRootFrame, aCandidateRootFrame);
+
+ if (!mRootElementFrame && aCandidateRootFrame) {
+ // The frame we're constructing will be the root element frame.
+ SetRootElementFrameAndConstructCanvasAnonContent(newFrame, aState,
+ aFrameList);
+ }
+
+ nsFrameList childList;
+
+ // Process children
+ if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) {
+ ConstructFramesFromItemList(
+ aState, aItem.mChildItems, innerFrame,
+ aItem.mFCData->mBits & FCDATA_IS_WRAPPER_ANON_BOX, childList);
+ } else {
+ ProcessChildren(aState, content, computedStyle, innerFrame, true, childList,
+ false);
+ }
+
+ // Set the inner wrapper frame's initial primary list
+ innerFrame->SetInitialChildList(kPrincipalList, childList);
+
+ return newFrame;
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructOuterSVG(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList) {
+ return ConstructFrameWithAnonymousChild(
+ aState, aItem, aParentFrame, aFrameList, NS_NewSVGOuterSVGFrame,
+ NS_NewSVGOuterSVGAnonChildFrame, PseudoStyleType::mozSVGOuterSVGAnonChild,
+ true);
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructMarker(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList) {
+ return ConstructFrameWithAnonymousChild(
+ aState, aItem, aParentFrame, aFrameList, NS_NewSVGMarkerFrame,
+ NS_NewSVGMarkerAnonChildFrame, PseudoStyleType::mozSVGMarkerAnonChild,
+ false);
+}
+
+// Only outer <svg> elements can be floated or positioned. All other SVG
+// should be in-flow.
+#define SIMPLE_SVG_FCDATA(_func) \
+ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | \
+ FCDATA_DISALLOW_GENERATED_CONTENT, \
+ _func)
+#define SIMPLE_SVG_CREATE(_tag, _func) \
+ { nsGkAtoms::_tag, SIMPLE_SVG_FCDATA(_func) }
+
+static bool IsFilterPrimitiveChildTag(const nsAtom* aTag) {
+ return aTag == nsGkAtoms::feDistantLight || aTag == nsGkAtoms::fePointLight ||
+ aTag == nsGkAtoms::feSpotLight || aTag == nsGkAtoms::feFuncR ||
+ aTag == nsGkAtoms::feFuncG || aTag == nsGkAtoms::feFuncB ||
+ aTag == nsGkAtoms::feFuncA || aTag == nsGkAtoms::feMergeNode;
+}
+
+/* static */
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindSVGData(const Element& aElement,
+ nsIFrame* aParentFrame,
+ bool aIsWithinSVGText,
+ bool aAllowsTextPathChild,
+ ComputedStyle& aStyle) {
+ MOZ_ASSERT(aElement.IsSVGElement());
+
+ static const FrameConstructionData sSuppressData = SUPPRESS_FCDATA();
+ static const FrameConstructionData sContainerData =
+ SIMPLE_SVG_FCDATA(NS_NewSVGContainerFrame);
+
+ bool parentIsSVG = aIsWithinSVGText;
+ nsIContent* parentContent =
+ aParentFrame ? aParentFrame->GetContent() : nullptr;
+
+ nsAtom* tag = aElement.NodeInfo()->NameAtom();
+
+ // XXXbz should this really be based on the tag of the parent frame's content?
+ // Should it not be based on the type of the parent frame (e.g. whether it's
+ // an SVG frame)?
+ if (parentContent) {
+ // It's not clear whether the SVG spec intends to allow any SVG
+ // content within svg:foreignObject at all (SVG 1.1, section
+ // 23.2), but if it does, it better be svg:svg. So given that
+ // we're allowing it, treat it as a non-SVG parent.
+ parentIsSVG =
+ parentContent->IsSVGElement() &&
+ parentContent->NodeInfo()->NameAtom() != nsGkAtoms::foreignObject;
+ }
+
+ if ((tag != nsGkAtoms::svg && !parentIsSVG) ||
+ (tag == nsGkAtoms::desc || tag == nsGkAtoms::title ||
+ tag == nsGkAtoms::metadata)) {
+ // Sections 5.1 and G.4 of SVG 1.1 say that SVG elements other than
+ // svg:svg not contained within svg:svg are incorrect, although they
+ // don't seem to specify error handling. Ignore them, since many of
+ // our frame classes can't deal. It *may* be that the document
+ // should at that point be considered in error according to F.2, but
+ // it's hard to tell.
+ //
+ // Style mutation can't change this situation, so don't bother
+ // adding to the undisplayed content map.
+ //
+ // We don't currently handle any UI for desc/title/metadata
+ return &sSuppressData;
+ }
+
+ // We don't need frames for animation elements
+ if (nsCOMPtr<SVGAnimationElement> animationElement =
+ do_QueryInterface(const_cast<Element*>(&aElement))) {
+ return &sSuppressData;
+ }
+
+ if (tag == nsGkAtoms::svg && !parentIsSVG) {
+ // We need outer <svg> elements to have an SVGOuterSVGFrame regardless
+ // of whether they fail conditional processing attributes, since various
+ // SVG frames assume that one exists. We handle the non-rendering
+ // of failing outer <svg> element contents like <switch> statements,
+ // and do the PassesConditionalProcessingTests call in
+ // SVGOuterSVGFrame::Init.
+ static const FrameConstructionData sOuterSVGData =
+ FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructOuterSVG);
+ return &sOuterSVGData;
+ }
+
+ if (tag == nsGkAtoms::marker) {
+ static const FrameConstructionData sMarkerSVGData =
+ FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructMarker);
+ return &sMarkerSVGData;
+ }
+
+ nsCOMPtr<SVGTests> tests = do_QueryInterface(const_cast<Element*>(&aElement));
+ if (tests && !tests->PassesConditionalProcessingTests()) {
+ // Elements with failing conditional processing attributes never get
+ // rendered. Note that this is not where we select which frame in a
+ // <switch> to render! That happens in SVGSwitchFrame::PaintSVG.
+ if (aIsWithinSVGText) {
+ // SVGTextFrame doesn't handle conditional processing attributes,
+ // so don't create frames for descendants of <text> with failing
+ // attributes. We need frames not to be created so that text layout
+ // is correct.
+ return &sSuppressData;
+ }
+ // If we're not inside <text>, create an SVGContainerFrame (which is a
+ // frame that doesn't render) so that paint servers can still be referenced,
+ // even if they live inside an element with failing conditional processing
+ // attributes.
+ return &sContainerData;
+ }
+
+ // Ensure that a stop frame is a child of a gradient and that gradients
+ // can only have stop children.
+ bool parentIsGradient = aParentFrame && static_cast<SVGGradientFrame*>(
+ do_QueryFrame(aParentFrame));
+ bool stop = (tag == nsGkAtoms::stop);
+ if ((parentIsGradient && !stop) || (!parentIsGradient && stop)) {
+ return &sSuppressData;
+ }
+
+ // Prevent bad frame types being children of filters or parents of filter
+ // primitives. If aParentFrame is null, we know that the frame that will
+ // be created will be an nsInlineFrame, so it can never be a filter.
+ bool parentIsFilter = aParentFrame && aParentFrame->IsSVGFilterFrame();
+ nsCOMPtr<SVGFE> filterPrimitive =
+ do_QueryInterface(const_cast<Element*>(&aElement));
+ if ((parentIsFilter && !filterPrimitive) ||
+ (!parentIsFilter && filterPrimitive)) {
+ return &sSuppressData;
+ }
+
+ // Prevent bad frame types being children of filter primitives or parents of
+ // filter primitive children. If aParentFrame is null, we know that the frame
+ // that will be created will be an nsInlineFrame, so it can never be a filter
+ // primitive.
+ bool parentIsFEContainerFrame =
+ aParentFrame && aParentFrame->IsSVGFEContainerFrame();
+ if ((parentIsFEContainerFrame && !IsFilterPrimitiveChildTag(tag)) ||
+ (!parentIsFEContainerFrame && IsFilterPrimitiveChildTag(tag))) {
+ return &sSuppressData;
+ }
+
+ // Special cases for text/tspan/textPath, because the kind of frame
+ // they get depends on the parent frame. We ignore 'a' elements when
+ // determining the parent, however.
+ if (aIsWithinSVGText) {
+ // If aIsWithinSVGText is true, then we know that the "SVG text uses
+ // CSS frames" pref was true when this SVG fragment was first constructed.
+ //
+ // FIXME(bug 1588477) Don't render stuff in display: contents / Shadow DOM
+ // subtrees, because TextCorrespondenceRecorder in the SVG text code doesn't
+ // really know how to deal with it. This kinda sucks. :(
+ if (aParentFrame && aParentFrame->GetContent() != aElement.GetParent()) {
+ return &sSuppressData;
+ }
+
+ // We don't use ConstructInline because we want different behavior
+ // for generated content.
+ static const FrameConstructionData sTSpanData = FCDATA_DECL(
+ FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH |
+ FCDATA_DISALLOW_GENERATED_CONTENT | FCDATA_IS_LINE_PARTICIPANT |
+ FCDATA_IS_INLINE | FCDATA_USE_CHILD_ITEMS,
+ NS_NewInlineFrame);
+ if (tag == nsGkAtoms::textPath) {
+ if (aAllowsTextPathChild) {
+ return &sTSpanData;
+ }
+ } else if (tag == nsGkAtoms::tspan || tag == nsGkAtoms::a) {
+ return &sTSpanData;
+ }
+ return &sSuppressData;
+ } else if (tag == nsGkAtoms::tspan || tag == nsGkAtoms::textPath) {
+ return &sSuppressData;
+ }
+
+ static const FrameConstructionDataByTag sSVGData[] = {
+ SIMPLE_SVG_CREATE(svg, NS_NewSVGInnerSVGFrame),
+ SIMPLE_SVG_CREATE(g, NS_NewSVGGFrame),
+ SIMPLE_SVG_CREATE(svgSwitch, NS_NewSVGSwitchFrame),
+ SIMPLE_SVG_CREATE(symbol, NS_NewSVGSymbolFrame),
+ SIMPLE_SVG_CREATE(polygon, NS_NewSVGGeometryFrame),
+ SIMPLE_SVG_CREATE(polyline, NS_NewSVGGeometryFrame),
+ SIMPLE_SVG_CREATE(circle, NS_NewSVGGeometryFrame),
+ SIMPLE_SVG_CREATE(ellipse, NS_NewSVGGeometryFrame),
+ SIMPLE_SVG_CREATE(line, NS_NewSVGGeometryFrame),
+ SIMPLE_SVG_CREATE(rect, NS_NewSVGGeometryFrame),
+ SIMPLE_SVG_CREATE(path, NS_NewSVGGeometryFrame),
+ SIMPLE_SVG_CREATE(defs, NS_NewSVGContainerFrame),
+ {nsGkAtoms::text,
+ FCDATA_WITH_WRAPPING_BLOCK(
+ FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_ALLOW_BLOCK_STYLES,
+ NS_NewSVGTextFrame, PseudoStyleType::mozSVGText)},
+ {nsGkAtoms::foreignObject,
+ FCDATA_WITH_WRAPPING_BLOCK(FCDATA_DISALLOW_OUT_OF_FLOW,
+ NS_NewSVGForeignObjectFrame,
+ PseudoStyleType::mozSVGForeignContent)},
+ SIMPLE_SVG_CREATE(a, NS_NewSVGAFrame),
+ SIMPLE_SVG_CREATE(linearGradient, NS_NewSVGLinearGradientFrame),
+ SIMPLE_SVG_CREATE(radialGradient, NS_NewSVGRadialGradientFrame),
+ SIMPLE_SVG_CREATE(stop, NS_NewSVGStopFrame),
+ SIMPLE_SVG_CREATE(use, NS_NewSVGUseFrame),
+ SIMPLE_SVG_CREATE(view, NS_NewSVGViewFrame),
+ SIMPLE_SVG_CREATE(image, NS_NewSVGImageFrame),
+ SIMPLE_SVG_CREATE(clipPath, NS_NewSVGClipPathFrame),
+ SIMPLE_SVG_CREATE(filter, NS_NewSVGFilterFrame),
+ SIMPLE_SVG_CREATE(pattern, NS_NewSVGPatternFrame),
+ SIMPLE_SVG_CREATE(mask, NS_NewSVGMaskFrame),
+ SIMPLE_SVG_CREATE(feDistantLight, NS_NewSVGFEUnstyledLeafFrame),
+ SIMPLE_SVG_CREATE(fePointLight, NS_NewSVGFEUnstyledLeafFrame),
+ SIMPLE_SVG_CREATE(feSpotLight, NS_NewSVGFEUnstyledLeafFrame),
+ SIMPLE_SVG_CREATE(feBlend, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feColorMatrix, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feFuncR, NS_NewSVGFEUnstyledLeafFrame),
+ SIMPLE_SVG_CREATE(feFuncG, NS_NewSVGFEUnstyledLeafFrame),
+ SIMPLE_SVG_CREATE(feFuncB, NS_NewSVGFEUnstyledLeafFrame),
+ SIMPLE_SVG_CREATE(feFuncA, NS_NewSVGFEUnstyledLeafFrame),
+ SIMPLE_SVG_CREATE(feComposite, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feComponentTransfer, NS_NewSVGFEContainerFrame),
+ SIMPLE_SVG_CREATE(feConvolveMatrix, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feDiffuseLighting, NS_NewSVGFEContainerFrame),
+ SIMPLE_SVG_CREATE(feDisplacementMap, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feDropShadow, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feFlood, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feGaussianBlur, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feImage, NS_NewSVGFEImageFrame),
+ SIMPLE_SVG_CREATE(feMerge, NS_NewSVGFEContainerFrame),
+ SIMPLE_SVG_CREATE(feMergeNode, NS_NewSVGFEUnstyledLeafFrame),
+ SIMPLE_SVG_CREATE(feMorphology, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feOffset, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feSpecularLighting, NS_NewSVGFEContainerFrame),
+ SIMPLE_SVG_CREATE(feTile, NS_NewSVGFELeafFrame),
+ SIMPLE_SVG_CREATE(feTurbulence, NS_NewSVGFELeafFrame)};
+
+ const FrameConstructionData* data =
+ FindDataByTag(aElement, aStyle, sSVGData, ArrayLength(sSVGData));
+
+ if (!data) {
+ data = &sContainerData;
+ }
+
+ return data;
+}
+
+void nsCSSFrameConstructor::AddPageBreakItem(
+ nsIContent* aContent, FrameConstructionItemList& aItems) {
+ RefPtr<ComputedStyle> pseudoStyle =
+ mPresShell->StyleSet()->ResolveNonInheritingAnonymousBoxStyle(
+ PseudoStyleType::pageBreak);
+
+ MOZ_ASSERT(pseudoStyle->StyleDisplay()->mDisplay == StyleDisplay::Block,
+ "Unexpected display");
+
+ static const FrameConstructionData sPageBreakData =
+ FCDATA_DECL(FCDATA_SKIP_FRAMESET, NS_NewPageBreakFrame);
+
+ aItems.AppendItem(this, &sPageBreakData, aContent, pseudoStyle.forget(),
+ true);
+}
+
+bool nsCSSFrameConstructor::ShouldCreateItemsForChild(
+ nsFrameConstructorState& aState, nsIContent* aContent,
+ nsContainerFrame* aParentFrame) {
+ aContent->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME);
+ // XXX the GetContent() != aContent check is needed due to bug 135040.
+ // Remove it once that's fixed.
+ if (aContent->GetPrimaryFrame() &&
+ aContent->GetPrimaryFrame()->GetContent() == aContent &&
+ !aState.mCreatingExtraFrames) {
+ MOZ_ASSERT(false,
+ "asked to create frame construction item for a node that "
+ "already has a frame");
+ return false;
+ }
+
+ // don't create a whitespace frame if aParent doesn't want it
+ if (!NeedFrameFor(aState, aParentFrame, aContent)) {
+ return false;
+ }
+
+ // never create frames for comments or PIs
+ if (aContent->IsComment() || aContent->IsProcessingInstruction()) {
+ return false;
+ }
+
+ return true;
+}
+
+void nsCSSFrameConstructor::DoAddFrameConstructionItems(
+ nsFrameConstructorState& aState, nsIContent* aContent,
+ ComputedStyle* aComputedStyle, bool aSuppressWhiteSpaceOptimizations,
+ nsContainerFrame* aParentFrame, FrameConstructionItemList& aItems,
+ ItemFlags aFlags) {
+ auto flags = aFlags + ItemFlag::AllowPageBreak;
+ if (aParentFrame) {
+ if (SVGUtils::IsInSVGTextSubtree(aParentFrame)) {
+ flags += ItemFlag::IsWithinSVGText;
+ }
+ if (aParentFrame->IsBlockFrame() && aParentFrame->GetParent() &&
+ aParentFrame->GetParent()->IsSVGTextFrame()) {
+ flags += ItemFlag::AllowTextPathChild;
+ }
+ }
+ AddFrameConstructionItemsInternal(aState, aContent, aParentFrame,
+ aSuppressWhiteSpaceOptimizations,
+ aComputedStyle, flags, aItems);
+}
+
+void nsCSSFrameConstructor::AddFrameConstructionItems(
+ nsFrameConstructorState& aState, nsIContent* aContent,
+ bool aSuppressWhiteSpaceOptimizations, const InsertionPoint& aInsertion,
+ FrameConstructionItemList& aItems, ItemFlags aFlags) {
+ nsContainerFrame* parentFrame = aInsertion.mParentFrame;
+ if (!ShouldCreateItemsForChild(aState, aContent, parentFrame)) {
+ return;
+ }
+ RefPtr<ComputedStyle> computedStyle = ResolveComputedStyle(aContent);
+ DoAddFrameConstructionItems(aState, aContent, computedStyle,
+ aSuppressWhiteSpaceOptimizations, parentFrame,
+ aItems, aFlags);
+}
+
+// Whether we should suppress frames for a child under a <select> frame.
+//
+// Never create frames for non-option/optgroup kids of <select> and non-option
+// kids of <optgroup> inside a <select>.
+static bool ShouldSuppressFrameInSelect(const nsIContent* aParent,
+ const nsIContent& aChild) {
+ if (!aParent ||
+ !aParent->IsAnyOfHTMLElements(nsGkAtoms::select, nsGkAtoms::optgroup,
+ nsGkAtoms::option)) {
+ return false;
+ }
+
+ // Options with labels have their label text added in ::before by forms.css.
+ // Suppress frames for their child text.
+ if (aParent->IsHTMLElement(nsGkAtoms::option) &&
+ !aChild.IsRootOfNativeAnonymousSubtree()) {
+ return aParent->AsElement()->HasNonEmptyAttr(nsGkAtoms::label);
+ }
+
+ // If we're in any display: contents subtree, just suppress the frame.
+ //
+ // We can't be regular NAC, since display: contents has no frame to generate
+ // them off.
+ if (aChild.GetParent() != aParent) {
+ return true;
+ }
+
+ // Option is always fine.
+ if (aChild.IsHTMLElement(nsGkAtoms::option)) {
+ return false;
+ }
+
+ // <optgroup> is OK in <select> but not in <optgroup>.
+ if (aChild.IsHTMLElement(nsGkAtoms::optgroup) &&
+ aParent->IsHTMLElement(nsGkAtoms::select)) {
+ return false;
+ }
+
+ // Allow native anonymous content no matter what.
+ if (aChild.IsRootOfNativeAnonymousSubtree()) {
+ return false;
+ }
+
+ return true;
+}
+
+static bool ShouldSuppressFrameInNonOpenDetails(
+ const HTMLDetailsElement* aDetails, ComputedStyle* aComputedStyle,
+ const nsIContent& aChild) {
+ if (!aDetails || aDetails->Open()) {
+ return false;
+ }
+
+ if (aChild.GetParent() != aDetails) {
+ return true;
+ }
+
+ auto* summary = HTMLSummaryElement::FromNode(aChild);
+ if (summary && summary->IsMainSummary()) {
+ return false;
+ }
+
+ // Don't suppress NAC, unless it's a ::before, inside ::marker, or ::after.
+ if (aChild.IsRootOfNativeAnonymousSubtree() &&
+ !(aChild.IsGeneratedContentContainerForMarker() &&
+ aComputedStyle->StyleList()->mListStylePosition ==
+ NS_STYLE_LIST_STYLE_POSITION_INSIDE) &&
+ !aChild.IsGeneratedContentContainerForBefore() &&
+ !aChild.IsGeneratedContentContainerForAfter()) {
+ return false;
+ }
+
+ return true;
+}
+
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindDataForContent(nsIContent& aContent,
+ ComputedStyle& aStyle,
+ nsIFrame* aParentFrame,
+ ItemFlags aFlags) {
+ MOZ_ASSERT(aStyle.StyleDisplay()->mDisplay != StyleDisplay::None &&
+ aStyle.StyleDisplay()->mDisplay != StyleDisplay::Contents,
+ "These two special display values should be handled earlier");
+
+ if (auto* text = Text::FromNode(aContent)) {
+ return FindTextData(*text, aParentFrame);
+ }
+
+ return FindElementData(*aContent.AsElement(), aStyle, aParentFrame, aFlags);
+}
+
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindElementData(const Element& aElement,
+ ComputedStyle& aStyle,
+ nsIFrame* aParentFrame,
+ ItemFlags aFlags) {
+ // Don't create frames for non-SVG element children of SVG elements.
+ if (!aElement.IsSVGElement()) {
+ if (aParentFrame && IsFrameForSVG(aParentFrame) &&
+ !aParentFrame->IsSVGForeignObjectFrame()) {
+ return nullptr;
+ }
+ if (aFlags.contains(ItemFlag::IsWithinSVGText)) {
+ return nullptr;
+ }
+ }
+
+ if (auto* data = FindElementTagData(aElement, aStyle, aParentFrame, aFlags)) {
+ return data;
+ }
+
+ // Check for 'content: <image-url>' on the element (which makes us ignore
+ // 'display' values other than 'none' or 'contents').
+ if (ShouldCreateImageFrameForContent(aElement, aStyle)) {
+ static const FrameConstructionData sImgData =
+ SIMPLE_FCDATA(NS_NewImageFrameForContentProperty);
+ return &sImgData;
+ }
+
+ const auto& display = *aStyle.StyleDisplay();
+ return FindDisplayData(display, aElement);
+}
+
+const nsCSSFrameConstructor::FrameConstructionData*
+nsCSSFrameConstructor::FindElementTagData(const Element& aElement,
+ ComputedStyle& aStyle,
+ nsIFrame* aParentFrame,
+ ItemFlags aFlags) {
+ // A ::marker pseudo creates a nsBulletFrame, unless 'content' was set.
+ if (aStyle.GetPseudoType() == PseudoStyleType::marker &&
+ aStyle.StyleContent()->ContentCount() == 0) {
+ static const FrameConstructionData data = FCDATA_DECL(
+ FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH |
+ FCDATA_DISALLOW_GENERATED_CONTENT | FCDATA_IS_LINE_PARTICIPANT |
+ FCDATA_IS_INLINE | FCDATA_USE_CHILD_ITEMS,
+ NS_NewBulletFrame);
+ return &data;
+ }
+ switch (aElement.GetNameSpaceID()) {
+ case kNameSpaceID_XHTML:
+ return FindHTMLData(aElement, aParentFrame, aStyle);
+ case kNameSpaceID_MathML:
+ return FindMathMLData(aElement, aStyle);
+ case kNameSpaceID_SVG:
+ return FindSVGData(aElement, aParentFrame,
+ aFlags.contains(ItemFlag::IsWithinSVGText),
+ aFlags.contains(ItemFlag::AllowTextPathChild), aStyle);
+ case kNameSpaceID_XUL:
+ return FindXULTagData(aElement, aStyle);
+ default:
+ return nullptr;
+ }
+}
+
+void nsCSSFrameConstructor::AddFrameConstructionItemsInternal(
+ nsFrameConstructorState& aState, nsIContent* aContent,
+ nsContainerFrame* aParentFrame, bool aSuppressWhiteSpaceOptimizations,
+ ComputedStyle* aComputedStyle, ItemFlags aFlags,
+ FrameConstructionItemList& aItems) {
+ MOZ_ASSERT(aContent->IsText() || aContent->IsElement(),
+ "Shouldn't get anything else here!");
+ MOZ_ASSERT(aContent->IsInComposedDoc());
+ MOZ_ASSERT(!aContent->GetPrimaryFrame() || aState.mCreatingExtraFrames ||
+ aContent->NodeInfo()->NameAtom() == nsGkAtoms::area);
+
+ const bool withinSVGText = aFlags.contains(ItemFlag::IsWithinSVGText);
+ const bool isGeneratedContent = aFlags.contains(ItemFlag::IsGeneratedContent);
+ MOZ_ASSERT(!isGeneratedContent || aComputedStyle->IsPseudoElement(),
+ "Generated content should be a pseudo-element");
+
+ FrameConstructionItem* item = nullptr;
+ auto cleanupGeneratedContent = mozilla::MakeScopeExit([&]() {
+ if (isGeneratedContent && !item) {
+ MOZ_ASSERT(!IsDisplayContents(aContent),
+ "This would need to change if we support display: contents "
+ "in generated content");
+ aContent->UnbindFromTree();
+ }
+ });
+
+ // 'display:none' elements never creates any frames at all.
+ const nsStyleDisplay& display = *aComputedStyle->StyleDisplay();
+ if (display.mDisplay == StyleDisplay::None) {
+ return;
+ }
+
+ if (display.mDisplay == StyleDisplay::Contents) {
+ // See the mDisplay fixup code in StyleAdjuster::adjust.
+ MOZ_ASSERT(!aContent->AsElement()->IsRootOfNativeAnonymousSubtree(),
+ "display:contents on anonymous content is unsupported");
+
+ // FIXME(bug 1588477): <svg:text>'s TextNodeCorrespondenceRecorder has
+ // trouble with everything that looks like display: contents.
+ if (withinSVGText) {
+ return;
+ }
+
+ CreateGeneratedContentItem(aState, aParentFrame, *aContent->AsElement(),
+ *aComputedStyle, PseudoStyleType::before,
+ aItems);
+
+ FlattenedChildIterator iter(aContent);
+ InsertionPoint insertion(aParentFrame, aContent);
+ for (nsIContent* child = iter.GetNextChild(); child;
+ child = iter.GetNextChild()) {
+ AddFrameConstructionItems(aState, child, aSuppressWhiteSpaceOptimizations,
+ insertion, aItems, aFlags);
+ }
+ aItems.SetParentHasNoShadowDOM(!iter.ShadowDOMInvolved());
+
+ CreateGeneratedContentItem(aState, aParentFrame, *aContent->AsElement(),
+ *aComputedStyle, PseudoStyleType::after, aItems);
+ return;
+ }
+
+ nsIContent* parent = aParentFrame ? aParentFrame->GetContent() : nullptr;
+ if (ShouldSuppressFrameInSelect(parent, *aContent)) {
+ return;
+ }
+
+ // When constructing a child of a non-open <details>, create only the frame
+ // for the main <summary> element, and skip other elements. This only applies
+ // to things that are not roots of native anonymous subtrees (except for
+ // ::before and ::after); we always want to create "internal" anonymous
+ // content.
+ auto* details = HTMLDetailsElement::FromNodeOrNull(parent);
+ if (ShouldSuppressFrameInNonOpenDetails(details, aComputedStyle, *aContent)) {
+ return;
+ }
+
+ const FrameConstructionData* data =
+ FindDataForContent(*aContent, *aComputedStyle, aParentFrame, aFlags);
+ if (!data || data->mBits & FCDATA_SUPPRESS_FRAME) {
+ return;
+ }
+
+ bool isPopup = false;
+
+#ifdef MOZ_XUL
+ if ((data->mBits & FCDATA_IS_POPUP) && (!aParentFrame || // Parent is inline
+ !aParentFrame->IsMenuFrame())) {
+ if (!aState.mPopupList.containingBlock && !aState.mHavePendingPopupgroup) {
+ return;
+ }
+
+ isPopup = true;
+ }
+#endif /* MOZ_XUL */
+
+ uint32_t bits = data->mBits;
+
+ // Inside colgroups, suppress everything except columns.
+ if (aParentFrame && aParentFrame->IsTableColGroupFrame() &&
+ (!(bits & FCDATA_IS_TABLE_PART) ||
+ display.mDisplay != StyleDisplay::TableColumn)) {
+ return;
+ }
+
+ bool canHavePageBreak =
+ aFlags.contains(ItemFlag::AllowPageBreak) &&
+ aState.mPresContext->IsPaginated() &&
+ !display.IsAbsolutelyPositionedStyle() &&
+ !(aParentFrame && aParentFrame->IsGridContainerFrame()) &&
+ !(bits & FCDATA_IS_TABLE_PART) && !(bits & FCDATA_IS_SVG_TEXT);
+
+ if (canHavePageBreak && display.BreakBefore()) {
+ AddPageBreakItem(aContent, aItems);
+ }
+
+ if (details && details->Open()) {
+ auto* summary = HTMLSummaryElement::FromNode(aContent);
+ if (summary && summary->IsMainSummary()) {
+ // If details is open, the main summary needs to be rendered as if it is
+ // the first child, so add the item to the front of the item list.
+ item = aItems.PrependItem(this, data, aContent, do_AddRef(aComputedStyle),
+ aSuppressWhiteSpaceOptimizations);
+ }
+ }
+
+ if (!item) {
+ item = aItems.AppendItem(this, data, aContent, do_AddRef(aComputedStyle),
+ aSuppressWhiteSpaceOptimizations);
+ }
+ item->mIsText = !aContent->IsElement();
+ item->mIsGeneratedContent = isGeneratedContent;
+ if (isGeneratedContent) {
+ // We need to keep this alive until the frame takes ownership.
+ // This corresponds to the Release in ConstructFramesFromItem.
+ item->mContent->AddRef();
+ }
+ item->mIsRootPopupgroup = aContent->IsRootOfNativeAnonymousSubtree() &&
+ aContent->IsXULElement(nsGkAtoms::popupgroup);
+ if (item->mIsRootPopupgroup) {
+ aState.mHavePendingPopupgroup = true;
+ }
+ item->mIsPopup = isPopup;
+
+ if (canHavePageBreak && display.BreakAfter()) {
+ AddPageBreakItem(aContent, aItems);
+ }
+
+ if (bits & FCDATA_IS_INLINE) {
+ // To correctly set item->mIsAllInline we need to build up our child items
+ // right now.
+ BuildInlineChildItems(aState, *item,
+ aFlags.contains(ItemFlag::IsWithinSVGText),
+ aFlags.contains(ItemFlag::AllowTextPathChild));
+ item->mIsBlock = false;
+ } else {
+ // Compute a boolean isInline which is guaranteed to be false for blocks
+ // (but may also be false for some inlines).
+ bool isInline =
+ // Table-internal things are inline-outside if and only if they're kids
+ // of inlines, since they'll trigger construction of inline-table
+ // pseudos.
+ ((bits & FCDATA_IS_TABLE_PART) &&
+ (!aParentFrame || // No aParentFrame means inline
+ aParentFrame->StyleDisplay()->IsInlineFlow())) ||
+ // Things that are inline-outside but aren't inline frames are inline
+ display.IsInlineOutsideStyle() ||
+ // Popups that are certainly out of flow.
+ isPopup;
+
+ // Set mIsAllInline conservatively. It just might be that even an inline
+ // that has mIsAllInline false doesn't need an {ib} split. So this is just
+ // an optimization to keep from doing too much work in cases when we can
+ // show that mIsAllInline is true..
+ item->mIsAllInline =
+ isInline ||
+ // Figure out whether we're guaranteed this item will be out of flow.
+ // This is not a precise test, since one of our ancestor inlines might
+ // add an absolute containing block (if it's relatively positioned) when
+ // there wasn't such a containing block before. But it's conservative
+ // in the sense that anything that will really end up as an in-flow
+ // non-inline will test false here. In other words, if this test is
+ // true we're guaranteed to be inline; if it's false we don't know what
+ // we'll end up as.
+ //
+ // If we make this test precise, we can remove some of the code dealing
+ // with the imprecision in ConstructInline and adjust the comments on
+ // mIsAllInline and mIsBlock in the header.
+ (!(bits & FCDATA_DISALLOW_OUT_OF_FLOW) &&
+ aState.GetGeometricParent(display, nullptr));
+
+ // Set mIsBlock conservatively. It's OK to set it false for some real
+ // blocks, but not OK to set it true for things that aren't blocks. Since
+ // isOutOfFlow might be false even in cases when the frame will end up
+ // out-of-flow, we can't use it here. But we _can_ say that the frame will
+ // for sure end up in-flow if it's not floated or absolutely positioned.
+ item->mIsBlock = !isInline && !display.IsAbsolutelyPositionedStyle() &&
+ !display.IsFloatingStyle() && !(bits & FCDATA_IS_SVG_TEXT);
+ }
+
+ if (item->mIsAllInline) {
+ aItems.InlineItemAdded();
+ } else if (item->mIsBlock) {
+ aItems.BlockItemAdded();
+ }
+
+ // Our item should be treated as a line participant if we have the relevant
+ // bit and are going to be in-flow. Note that this really only matters if
+ // our ancestor is a box or some such, so the fact that we might have an
+ // inline ancestor that might become a containing block is not relevant here.
+ if ((bits & FCDATA_IS_LINE_PARTICIPANT) &&
+ ((bits & FCDATA_DISALLOW_OUT_OF_FLOW) ||
+ !aState.GetGeometricParent(display, nullptr))) {
+ item->mIsLineParticipant = true;
+ aItems.LineParticipantItemAdded();
+ }
+}
+
+/**
+ * Return true if the frame construction item pointed to by aIter will
+ * create a frame adjacent to a line boundary in the frame tree, and that
+ * line boundary is induced by a content node adjacent to the frame's
+ * content node in the content tree. The latter condition is necessary so
+ * that ContentAppended/ContentInserted/ContentRemoved can easily find any
+ * text nodes that were suppressed here.
+ */
+bool nsCSSFrameConstructor::AtLineBoundary(FCItemIterator& aIter) {
+ if (aIter.item().mSuppressWhiteSpaceOptimizations) {
+ return false;
+ }
+
+ if (aIter.AtStart()) {
+ if (aIter.List()->HasLineBoundaryAtStart() &&
+ !aIter.item().mContent->GetPreviousSibling())
+ return true;
+ } else {
+ FCItemIterator prev = aIter;
+ prev.Prev();
+ if (prev.item().IsLineBoundary() &&
+ !prev.item().mSuppressWhiteSpaceOptimizations &&
+ aIter.item().mContent->GetPreviousSibling() == prev.item().mContent)
+ return true;
+ }
+
+ FCItemIterator next = aIter;
+ next.Next();
+ if (next.IsDone()) {
+ if (aIter.List()->HasLineBoundaryAtEnd() &&
+ !aIter.item().mContent->GetNextSibling())
+ return true;
+ } else {
+ if (next.item().IsLineBoundary() &&
+ !next.item().mSuppressWhiteSpaceOptimizations &&
+ aIter.item().mContent->GetNextSibling() == next.item().mContent)
+ return true;
+ }
+
+ return false;
+}
+
+void nsCSSFrameConstructor::ConstructFramesFromItem(
+ nsFrameConstructorState& aState, FCItemIterator& aIter,
+ nsContainerFrame* aParentFrame, nsFrameList& aFrameList) {
+ FrameConstructionItem& item = aIter.item();
+ ComputedStyle* computedStyle = item.mComputedStyle;
+
+ const auto* disp = computedStyle->StyleDisplay();
+ MOZ_ASSERT(!disp->IsAbsolutelyPositionedStyle() ||
+ disp->DisplayInside() != StyleDisplayInside::MozBox,
+ "This may be a frame that was previously blockified "
+ "but isn't any longer! It probably needs explicit "
+ "'display:block' to preserve behavior");
+ Unused << disp; // (unused in configs that define the assertion away)
+
+ if (item.mIsText) {
+ // If this is collapsible whitespace next to a line boundary,
+ // don't create a frame. item.IsWhitespace() also sets the
+ // NS_CREATE_FRAME_IF_NON_WHITESPACE flag in the text node. (If we
+ // end up creating a frame, nsTextFrame::Init will clear the flag.)
+ // We don't do this for generated content, because some generated
+ // text content is empty text nodes that are about to be initialized.
+ // (We check mAdditionalStateBits because only the generated content
+ // container's frame construction item is marked with
+ // mIsGeneratedContent, and we might not have an aParentFrame.)
+ // We don't do it for content that may have Shadow DOM siblings / insertion
+ // points, because they make it difficult to correctly create the frame due
+ // to dynamic changes.
+ // We don't do it for SVG text, since we might need to position and
+ // measure the white space glyphs due to x/y/dx/dy attributes.
+ if (AtLineBoundary(aIter) &&
+ !computedStyle->StyleText()->WhiteSpaceOrNewlineIsSignificant() &&
+ aIter.List()->ParentHasNoShadowDOM() &&
+ !(aState.mAdditionalStateBits & NS_FRAME_GENERATED_CONTENT) &&
+ (item.mFCData->mBits & FCDATA_IS_LINE_PARTICIPANT) &&
+ !(item.mFCData->mBits & FCDATA_IS_SVG_TEXT) &&
+ !mAlwaysCreateFramesForIgnorableWhitespace && item.IsWhitespace(aState))
+ return;
+
+ ConstructTextFrame(item.mFCData, aState, item.mContent, aParentFrame,
+ computedStyle, aFrameList);
+ return;
+ }
+
+ AutoRestore<nsFrameState> savedStateBits(aState.mAdditionalStateBits);
+ if (item.mIsGeneratedContent) {
+ // Ensure that frames created here are all tagged with
+ // NS_FRAME_GENERATED_CONTENT.
+ aState.mAdditionalStateBits |= NS_FRAME_GENERATED_CONTENT;
+ }
+
+ // XXXbz maybe just inline ConstructFrameFromItemInternal here or something?
+ ConstructFrameFromItemInternal(item, aState, aParentFrame, aFrameList);
+
+ if (item.mIsGeneratedContent) {
+ // This corresponds to the AddRef in AddFrameConstructionItemsInternal.
+ // The frame owns the generated content now.
+ item.mContent->Release();
+
+ // Now that we've passed ownership of item.mContent to the frame, unset
+ // our generated content flag so we don't release or unbind it ourselves.
+ item.mIsGeneratedContent = false;
+ }
+}
+
+void nsCSSFrameConstructor::ReconstructDocElementHierarchy(
+ InsertionKind aInsertionKind) {
+ Element* rootElement = mDocument->GetRootElement();
+ if (!rootElement) {
+ /* nothing to do */
+ return;
+ }
+ RecreateFramesForContent(rootElement, aInsertionKind);
+}
+
+nsContainerFrame* nsCSSFrameConstructor::GetAbsoluteContainingBlock(
+ nsIFrame* aFrame, ContainingBlockType aType) {
+ // Starting with aFrame, look for a frame that is absolutely positioned or
+ // relatively positioned (and transformed, if aType is FIXED)
+ for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
+ if (frame->IsFrameOfType(nsIFrame::eMathML)) {
+ // If it's mathml, bail out -- no absolute positioning out from inside
+ // mathml frames. Note that we don't make this part of the loop
+ // condition because of the stuff at the end of this method...
+ return nullptr;
+ }
+
+ // Look for the ICB.
+ if (aType == FIXED_POS) {
+ LayoutFrameType t = frame->Type();
+ if (t == LayoutFrameType::Viewport || t == LayoutFrameType::PageContent) {
+ return static_cast<nsContainerFrame*>(frame);
+ }
+ }
+
+ // If the frame is positioned, we will probably return it as the containing
+ // block (see the exceptions below). Otherwise, we'll start looking at the
+ // parent frame, unless we're dealing with a scrollframe.
+ // Scrollframes are special since they're not positioned, but their
+ // scrolledframe might be. So, we need to check this special case to return
+ // the correct containing block (the scrolledframe) in that case.
+ // If we're looking for a fixed-pos containing block and the frame is
+ // not transformed, skip it.
+ if (!frame->IsAbsPosContainingBlock() ||
+ (aType == FIXED_POS && !frame->IsFixedPosContainingBlock())) {
+ continue;
+ }
+ nsIFrame* absPosCBCandidate = frame;
+ LayoutFrameType type = absPosCBCandidate->Type();
+ if (type == LayoutFrameType::FieldSet) {
+ absPosCBCandidate =
+ static_cast<nsFieldSetFrame*>(absPosCBCandidate)->GetInner();
+ if (!absPosCBCandidate) {
+ continue;
+ }
+ type = absPosCBCandidate->Type();
+ }
+ if (type == LayoutFrameType::Scroll) {
+ nsIScrollableFrame* scrollFrame = do_QueryFrame(absPosCBCandidate);
+ absPosCBCandidate = scrollFrame->GetScrolledFrame();
+ if (!absPosCBCandidate) {
+ continue;
+ }
+ type = absPosCBCandidate->Type();
+ }
+ // Only first continuations can be containing blocks.
+ absPosCBCandidate = absPosCBCandidate->FirstContinuation();
+ // Is the frame really an absolute container?
+ if (!absPosCBCandidate->IsAbsoluteContainer()) {
+ continue;
+ }
+
+ // For tables, skip the inner frame and consider the table wrapper frame.
+ if (type == LayoutFrameType::Table) {
+ continue;
+ }
+ // For table wrapper frames, we can just return absPosCBCandidate.
+ MOZ_ASSERT((nsContainerFrame*)do_QueryFrame(absPosCBCandidate),
+ "abs.pos. containing block must be nsContainerFrame sub-class");
+ return static_cast<nsContainerFrame*>(absPosCBCandidate);
+ }
+
+ MOZ_ASSERT(aType != FIXED_POS, "no ICB in this frame tree?");
+
+ // It is possible for the search for the containing block to fail, because
+ // no absolute container can be found in the parent chain. In those cases,
+ // we fall back to the document element's containing block.
+ return mHasRootAbsPosContainingBlock ? mDocElementContainingBlock : nullptr;
+}
+
+nsContainerFrame* nsCSSFrameConstructor::GetFloatContainingBlock(
+ nsIFrame* aFrame) {
+ // Starting with aFrame, look for a frame that is a float containing block.
+ // IF we hit a mathml frame, bail out; we don't allow floating out of mathml
+ // frames, because they don't seem to be able to deal.
+ // The logic here needs to match the logic in ProcessChildren()
+ for (nsIFrame* containingBlock = aFrame;
+ containingBlock && !ShouldSuppressFloatingOfDescendants(containingBlock);
+ containingBlock = containingBlock->GetParent()) {
+ if (containingBlock->IsFloatContainingBlock()) {
+ MOZ_ASSERT((nsContainerFrame*)do_QueryFrame(containingBlock),
+ "float containing block must be nsContainerFrame sub-class");
+ return static_cast<nsContainerFrame*>(containingBlock);
+ }
+ }
+
+ // If we didn't find a containing block, then there just isn't
+ // one.... return null
+ return nullptr;
+}
+
+/**
+ * This function will get the previous sibling to use for an append operation.
+ *
+ * It takes a parent frame (must not be null) and the next insertion sibling, if
+ * the parent content is display: contents or has ::after content (may be null).
+ */
+static nsIFrame* FindAppendPrevSibling(nsIFrame* aParentFrame,
+ nsIFrame* aNextSibling) {
+ aParentFrame->DrainSelfOverflowList();
+
+ if (aNextSibling) {
+ MOZ_ASSERT(
+ aNextSibling->GetParent()->GetContentInsertionFrame() == aParentFrame,
+ "Wrong parent");
+ return aNextSibling->GetPrevSibling();
+ }
+
+ return aParentFrame->GetChildList(kPrincipalList).LastChild();
+}
+
+/**
+ * Finds the right parent frame to append content to aParentFrame.
+ *
+ * Cannot return or receive null.
+ */
+static nsContainerFrame* ContinuationToAppendTo(
+ nsContainerFrame* aParentFrame) {
+ MOZ_ASSERT(aParentFrame);
+
+ if (IsFramePartOfIBSplit(aParentFrame)) {
+ // If the frame we are manipulating is a ib-split frame (that is, one that's
+ // been created as a result of a block-in-inline situation) then we need to
+ // append to the last ib-split sibling, not to the frame itself.
+ //
+ // Always make sure to look at the last continuation of the frame for the
+ // {ib} case, even if that continuation is empty.
+ //
+ // We don't do this for the non-ib-split-frame case, since in the other
+ // cases appending to the last nonempty continuation is fine and in fact not
+ // doing that can confuse code that doesn't know to pull kids from
+ // continuations other than its next one.
+ return static_cast<nsContainerFrame*>(
+ GetLastIBSplitSibling(aParentFrame)->LastContinuation());
+ }
+
+ return nsLayoutUtils::LastContinuationWithChild(aParentFrame);
+}
+
+/**
+ * This function will get the next sibling for a frame insert operation given
+ * the parent and previous sibling. aPrevSibling may be null.
+ */
+static nsIFrame* GetInsertNextSibling(nsIFrame* aParentFrame,
+ nsIFrame* aPrevSibling) {
+ if (aPrevSibling) {
+ return aPrevSibling->GetNextSibling();
+ }
+
+ return aParentFrame->PrincipalChildList().FirstChild();
+}
+
+void nsCSSFrameConstructor::AppendFramesToParent(
+ nsFrameConstructorState& aState, nsContainerFrame* aParentFrame,
+ nsFrameList& aFrameList, nsIFrame* aPrevSibling, bool aIsRecursiveCall) {
+ MOZ_ASSERT(
+ !IsFramePartOfIBSplit(aParentFrame) || !GetIBSplitSibling(aParentFrame) ||
+ !GetIBSplitSibling(aParentFrame)->PrincipalChildList().FirstChild(),
+ "aParentFrame has a ib-split sibling with kids?");
+ MOZ_ASSERT(!aPrevSibling || aPrevSibling->GetParent() == aParentFrame,
+ "Parent and prevsibling don't match");
+ MOZ_ASSERT(
+ !aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) ||
+ !IsFramePartOfIBSplit(aParentFrame),
+ "We should have wiped aParentFrame in WipeContainingBlock() "
+ "if it's part of an IB split!");
+
+ nsIFrame* nextSibling = ::GetInsertNextSibling(aParentFrame, aPrevSibling);
+
+ NS_ASSERTION(nextSibling || !aParentFrame->GetNextContinuation() ||
+ !aParentFrame->GetNextContinuation()
+ ->PrincipalChildList()
+ .FirstChild() ||
+ aIsRecursiveCall,
+ "aParentFrame has later continuations with kids?");
+ NS_ASSERTION(
+ nextSibling || !IsFramePartOfIBSplit(aParentFrame) ||
+ (IsInlineFrame(aParentFrame) && !GetIBSplitSibling(aParentFrame) &&
+ !aParentFrame->GetNextContinuation()) ||
+ aIsRecursiveCall,
+ "aParentFrame is not last?");
+
+ // If we're inserting a list of frames at the end of the trailing inline
+ // of an {ib} split, we may need to create additional {ib} siblings to parent
+ // them.
+ if (!nextSibling && IsFramePartOfIBSplit(aParentFrame)) {
+ // When we get here, our frame list might start with a block. If it does
+ // so, and aParentFrame is an inline, and it and all its previous
+ // continuations have no siblings, then put the initial blocks from the
+ // frame list into the previous block of the {ib} split. Note that we
+ // didn't want to stop at the block part of the split when figuring out
+ // initial parent, because that could screw up float parenting; it's easier
+ // to do this little fixup here instead.
+ if (aFrameList.NotEmpty() && aFrameList.FirstChild()->IsBlockOutside()) {
+ // See whether our trailing inline is empty
+ nsIFrame* firstContinuation = aParentFrame->FirstContinuation();
+ if (firstContinuation->PrincipalChildList().IsEmpty()) {
+ // Our trailing inline is empty. Collect our starting blocks from
+ // aFrameList, get the right parent frame for them, and put them in.
+ nsFrameList blockKids =
+ aFrameList.Split([](nsIFrame* f) { return !f->IsBlockOutside(); });
+ NS_ASSERTION(blockKids.NotEmpty(), "No blocks?");
+
+ nsContainerFrame* prevBlock = GetIBSplitPrevSibling(firstContinuation);
+ prevBlock =
+ static_cast<nsContainerFrame*>(prevBlock->LastContinuation());
+ NS_ASSERTION(prevBlock, "Should have previous block here");
+
+ MoveChildrenTo(aParentFrame, prevBlock, blockKids);
+ }
+ }
+
+ // We want to put some of the frames into this inline frame.
+ nsFrameList inlineKids =
+ aFrameList.Split([](nsIFrame* f) { return f->IsBlockOutside(); });
+
+ if (!inlineKids.IsEmpty()) {
+ AppendFrames(aParentFrame, kPrincipalList, inlineKids);
+ }
+
+ if (!aFrameList.IsEmpty()) {
+ nsFrameList ibSiblings;
+ CreateIBSiblings(aState, aParentFrame,
+ aParentFrame->IsAbsPosContainingBlock(), aFrameList,
+ ibSiblings);
+
+ // Make sure to trigger reflow of the inline that used to be our
+ // last one and now isn't anymore, since its GetSkipSides() has
+ // changed.
+ mPresShell->FrameNeedsReflow(aParentFrame, IntrinsicDirty::TreeChange,
+ NS_FRAME_HAS_DIRTY_CHILDREN);
+
+ // Recurse so we create new ib siblings as needed for aParentFrame's
+ // parent
+ return AppendFramesToParent(aState, aParentFrame->GetParent(), ibSiblings,
+ aParentFrame, true);
+ }
+ return;
+ }
+
+ // If we're appending a list of frames to the last continuations of a
+ // ::-moz-column-content, we may need to create column-span siblings for them.
+ if (!nextSibling && IsLastContinuationForColumnContent(aParentFrame)) {
+ // Extract any initial non-column-span kids, and append them to
+ // ::-moz-column-content's child list.
+ nsFrameList initialNonColumnSpanKids =
+ aFrameList.Split([](nsIFrame* f) { return f->IsColumnSpan(); });
+ AppendFrames(aParentFrame, kPrincipalList, initialNonColumnSpanKids);
+
+ if (aFrameList.IsEmpty()) {
+ // No more kids to process (there weren't any column-span kids).
+ return;
+ }
+
+ nsFrameList columnSpanSiblings = CreateColumnSpanSiblings(
+ aState, aParentFrame, aFrameList,
+ // Column content should never be a absolute/fixed positioned containing
+ // block. Pass nullptr as aPositionedFrame.
+ nullptr);
+
+ nsContainerFrame* columnSetWrapper = aParentFrame->GetParent();
+ while (!columnSetWrapper->IsColumnSetWrapperFrame()) {
+ columnSetWrapper = columnSetWrapper->GetParent();
+ }
+ MOZ_ASSERT(columnSetWrapper,
+ "No ColumnSetWrapperFrame ancestor for -moz-column-content?");
+
+ FinishBuildingColumns(aState, columnSetWrapper, aParentFrame,
+ columnSpanSiblings);
+
+ MOZ_ASSERT(columnSpanSiblings.IsEmpty(),
+ "The column-span siblings should be moved to the proper place!");
+ return;
+ }
+
+ // Insert the frames after our aPrevSibling
+ InsertFrames(aParentFrame, kPrincipalList, aPrevSibling, aFrameList);
+}
+
+// This gets called to see if the frames corresponding to aSibling and aContent
+// should be siblings in the frame tree. Although (1) rows and cols, (2) row
+// groups and col groups, (3) row groups and captions, (4) legends and content
+// inside fieldsets, (5) popups and other kids of the menu are siblings from a
+// content perspective, they are not considered siblings in the frame tree.
+bool nsCSSFrameConstructor::IsValidSibling(nsIFrame* aSibling,
+ nsIContent* aContent,
+ Maybe<StyleDisplay>& aDisplay) {
+ nsIFrame* parentFrame = aSibling->GetParent();
+ LayoutFrameType parentType = parentFrame->Type();
+
+ StyleDisplay siblingDisplay = aSibling->GetDisplay();
+ if (StyleDisplay::TableColumnGroup == siblingDisplay ||
+ StyleDisplay::TableColumn == siblingDisplay ||
+ StyleDisplay::TableCaption == siblingDisplay ||
+ StyleDisplay::TableHeaderGroup == siblingDisplay ||
+ StyleDisplay::TableRowGroup == siblingDisplay ||
+ StyleDisplay::TableFooterGroup == siblingDisplay ||
+ LayoutFrameType::Menu == parentType) {
+ // if we haven't already, resolve a style to find the display type of
+ // aContent.
+ if (aDisplay.isNothing()) {
+ if (aContent->IsComment() || aContent->IsProcessingInstruction()) {
+ // Comments and processing instructions never have frames, so we should
+ // not try to generate styles for them.
+ return false;
+ }
+ // FIXME(emilio): This is buggy some times, see bug 1424656.
+ RefPtr<ComputedStyle> computedStyle = ResolveComputedStyle(aContent);
+ const nsStyleDisplay* display = computedStyle->StyleDisplay();
+ aDisplay.emplace(display->mDisplay);
+ }
+
+ StyleDisplay display = aDisplay.value();
+ if (LayoutFrameType::Menu == parentType) {
+ return (StyleDisplay::MozPopup == display) ==
+ (StyleDisplay::MozPopup == siblingDisplay);
+ }
+ // To have decent performance we want to return false in cases in which
+ // reordering the two siblings has no effect on display. To ensure
+ // correctness, we MUST return false in cases where the two siblings have
+ // the same desired parent type and live on different display lists.
+ // Specificaly, columns and column groups should only consider columns and
+ // column groups as valid siblings. Captions should only consider other
+ // captions. All other things should consider each other as valid
+ // siblings. The restriction in the |if| above on siblingDisplay is ok,
+ // because for correctness the only part that really needs to happen is to
+ // not consider captions, column groups, and row/header/footer groups
+ // siblings of each other. Treating a column or colgroup as a valid
+ // sibling of a non-table-related frame will just mean we end up reframing.
+ if ((siblingDisplay == StyleDisplay::TableCaption) !=
+ (display == StyleDisplay::TableCaption)) {
+ // One's a caption and the other is not. Not valid siblings.
+ return false;
+ }
+
+ if ((siblingDisplay == StyleDisplay::TableColumnGroup ||
+ siblingDisplay == StyleDisplay::TableColumn) !=
+ (display == StyleDisplay::TableColumnGroup ||
+ display == StyleDisplay::TableColumn)) {
+ // One's a column or column group and the other is not. Not valid
+ // siblings.
+ return false;
+ }
+ // Fall through; it's possible that the display type was overridden and
+ // a different sort of frame was constructed, so we may need to return false
+ // below.
+ }
+
+ if (IsFrameForFieldSet(parentFrame)) {
+ // Legends can be sibling of legends but not of other content in the
+ // fieldset
+ if (nsContainerFrame* cif = aSibling->GetContentInsertionFrame()) {
+ aSibling = cif;
+ }
+ LayoutFrameType sibType = aSibling->Type();
+ bool legendContent = aContent->IsHTMLElement(nsGkAtoms::legend);
+
+ if ((legendContent && (LayoutFrameType::Legend != sibType)) ||
+ (!legendContent && (LayoutFrameType::Legend == sibType)))
+ return false;
+ }
+
+ return true;
+}
+
+// FIXME(emilio): If we ever kill IsValidSibling() we can simplify this quite a
+// bit (no need to pass aTargetContent or aTargetContentDisplay, and the
+// adjust() calls can be responsibility of the caller).
+template <nsCSSFrameConstructor::SiblingDirection aDirection>
+nsIFrame* nsCSSFrameConstructor::FindSiblingInternal(
+ FlattenedChildIterator& aIter, nsIContent* aTargetContent,
+ Maybe<StyleDisplay>& aTargetContentDisplay) {
+ auto adjust = [&](nsIFrame* aPotentialSiblingFrame) -> nsIFrame* {
+ return AdjustSiblingFrame(aPotentialSiblingFrame, aTargetContent,
+ aTargetContentDisplay, aDirection);
+ };
+
+ auto nextDomSibling = [](FlattenedChildIterator& aIter) -> nsIContent* {
+ return aDirection == SiblingDirection::Forward ? aIter.GetNextChild()
+ : aIter.GetPreviousChild();
+ };
+
+ auto getInsideMarkerFrame = [](const nsIContent* aContent) -> nsIFrame* {
+ auto* marker = nsLayoutUtils::GetMarkerFrame(aContent);
+ const bool isInsideMarker =
+ marker && marker->GetInFlowParent()->StyleList()->mListStylePosition ==
+ NS_STYLE_LIST_STYLE_POSITION_INSIDE;
+ return isInsideMarker ? marker : nullptr;
+ };
+
+ auto getNearPseudo = [&](const nsIContent* aContent) -> nsIFrame* {
+ if (aDirection == SiblingDirection::Forward) {
+ if (auto* marker = getInsideMarkerFrame(aContent)) {
+ return marker;
+ }
+ return nsLayoutUtils::GetBeforeFrame(aContent);
+ }
+ return nsLayoutUtils::GetAfterFrame(aContent);
+ };
+
+ auto getFarPseudo = [&](const nsIContent* aContent) -> nsIFrame* {
+ if (aDirection == SiblingDirection::Forward) {
+ return nsLayoutUtils::GetAfterFrame(aContent);
+ }
+ if (auto* before = nsLayoutUtils::GetBeforeFrame(aContent)) {
+ return before;
+ }
+ return getInsideMarkerFrame(aContent);
+ };
+
+ while (nsIContent* sibling = nextDomSibling(aIter)) {
+ // NOTE(emilio): It's important to check GetPrimaryFrame() before
+ // IsDisplayContents to get the correct insertion point when multiple
+ // siblings go from display: non-none to display: contents.
+ if (nsIFrame* primaryFrame = sibling->GetPrimaryFrame()) {
+ // XXX the GetContent() == sibling check is needed due to bug 135040.
+ // Remove it once that's fixed.
+ if (primaryFrame->GetContent() == sibling) {
+ if (nsIFrame* frame = adjust(primaryFrame)) {
+ return frame;
+ }
+ }
+ }
+
+ if (IsDisplayContents(sibling)) {
+ if (nsIFrame* frame = adjust(getNearPseudo(sibling))) {
+ return frame;
+ }
+
+ const bool startFromBeginning = aDirection == SiblingDirection::Forward;
+ FlattenedChildIterator iter(sibling, startFromBeginning);
+ nsIFrame* sibling = FindSiblingInternal<aDirection>(
+ iter, aTargetContent, aTargetContentDisplay);
+ if (sibling) {
+ return sibling;
+ }
+ }
+ }
+
+ return adjust(getFarPseudo(aIter.Parent()));
+}
+
+nsIFrame* nsCSSFrameConstructor::AdjustSiblingFrame(
+ nsIFrame* aSibling, nsIContent* aTargetContent,
+ Maybe<StyleDisplay>& aTargetContentDisplay, SiblingDirection aDirection) {
+ if (!aSibling) {
+ return nullptr;
+ }
+
+ if (aSibling->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
+ aSibling = aSibling->GetPlaceholderFrame();
+ MOZ_ASSERT(aSibling);
+ }
+
+ MOZ_ASSERT(!aSibling->GetPrevContinuation(), "How?");
+ if (aDirection == SiblingDirection::Backward) {
+ // The frame may be a ib-split frame (a split inline frame that contains a
+ // block). Get the last part of that split.
+ if (IsFramePartOfIBSplit(aSibling)) {
+ aSibling = GetLastIBSplitSibling(aSibling);
+ }
+
+ // The frame may have a continuation. If so, we want the last
+ // non-overflow-container continuation as our previous sibling.
+ aSibling = aSibling->GetTailContinuation();
+ }
+
+ if (!IsValidSibling(aSibling, aTargetContent, aTargetContentDisplay)) {
+ return nullptr;
+ }
+
+ return aSibling;
+}
+
+nsIFrame* nsCSSFrameConstructor::FindPreviousSibling(
+ const FlattenedChildIterator& aIter,
+ Maybe<StyleDisplay>& aTargetContentDisplay) {
+ return FindSibling<SiblingDirection::Backward>(aIter, aTargetContentDisplay);
+}
+
+nsIFrame* nsCSSFrameConstructor::FindNextSibling(
+ const FlattenedChildIterator& aIter,
+ Maybe<StyleDisplay>& aTargetContentDisplay) {
+ return FindSibling<SiblingDirection::Forward>(aIter, aTargetContentDisplay);
+}
+
+template <nsCSSFrameConstructor::SiblingDirection aDirection>
+nsIFrame* nsCSSFrameConstructor::FindSibling(
+ const FlattenedChildIterator& aIter,
+ Maybe<StyleDisplay>& aTargetContentDisplay) {
+ nsIContent* targetContent = aIter.Get();
+ FlattenedChildIterator siblingIter = aIter;
+ nsIFrame* sibling = FindSiblingInternal<aDirection>(
+ siblingIter, targetContent, aTargetContentDisplay);
+ if (sibling) {
+ return sibling;
+ }
+
+ // Our siblings (if any) do not have a frame to guide us. The frame for the
+ // target content should be inserted whereever a frame for the container would
+ // be inserted. This is needed when inserting into display: contents nodes.
+ const nsIContent* current = aIter.Parent();
+ while (IsDisplayContents(current)) {
+ const nsIContent* parent = current->GetFlattenedTreeParent();
+ MOZ_ASSERT(parent, "No display: contents on the root");
+
+ FlattenedChildIterator iter(parent);
+ iter.Seek(current);
+ sibling = FindSiblingInternal<aDirection>(iter, targetContent,
+ aTargetContentDisplay);
+ if (sibling) {
+ return sibling;
+ }
+
+ current = parent;
+ }
+
+ return nullptr;
+}
+
+// For fieldsets, returns the area frame, if the child is not a legend.
+static nsContainerFrame* GetAdjustedParentFrame(nsContainerFrame* aParentFrame,
+ nsIContent* aChildContent) {
+ MOZ_ASSERT(!aParentFrame->IsTableWrapperFrame(), "Shouldn't be happening!");
+
+ nsContainerFrame* newParent = nullptr;
+ if (aParentFrame->IsFieldSetFrame()) {
+ // If the parent is a fieldSet, use the fieldSet's area frame as the
+ // parent unless the new content is a legend.
+ if (!aChildContent->IsHTMLElement(nsGkAtoms::legend)) {
+ newParent = static_cast<nsFieldSetFrame*>(aParentFrame)->GetInner();
+ if (newParent) {
+ newParent = newParent->GetContentInsertionFrame();
+ }
+ }
+ }
+ return newParent ? newParent : aParentFrame;
+}
+
+nsIFrame* nsCSSFrameConstructor::GetInsertionPrevSibling(
+ InsertionPoint* aInsertion, nsIContent* aChild, bool* aIsAppend,
+ bool* aIsRangeInsertSafe, nsIContent* aStartSkipChild,
+ nsIContent* aEndSkipChild) {
+ MOZ_ASSERT(aInsertion->mParentFrame, "Must have parent frame to start with");
+
+ *aIsAppend = false;
+
+ // Find the frame that precedes the insertion point.
+ FlattenedChildIterator iter(aInsertion->mContainer);
+ if (iter.ShadowDOMInvolved() || !aChild->IsRootOfNativeAnonymousSubtree()) {
+ // The check for IsRootOfNativeAnonymousSubtree() is because editor is
+ // severely broken and calls us directly for native anonymous
+ // nodes that it creates.
+ if (aStartSkipChild) {
+ iter.Seek(aStartSkipChild);
+ } else {
+ iter.Seek(aChild);
+ }
+ } else {
+ // Prime the iterator for the call to FindPreviousSibling.
+ iter.GetNextChild();
+ MOZ_ASSERT(aChild->GetProperty(nsGkAtoms::restylableAnonymousNode),
+ "Someone passed native anonymous content directly into frame "
+ "construction. Stop doing that!");
+ }
+
+ // Note that FindPreviousSibling is passed the iterator by value, so that
+ // the later usage of the iterator starts from the same place.
+ Maybe<StyleDisplay> childDisplay;
+ nsIFrame* prevSibling = FindPreviousSibling(iter, childDisplay);
+
+ // Now, find the geometric parent so that we can handle
+ // continuations properly. Use the prev sibling if we have it;
+ // otherwise use the next sibling.
+ if (prevSibling) {
+ aInsertion->mParentFrame =
+ prevSibling->GetParent()->GetContentInsertionFrame();
+ } else {
+ // If there is no previous sibling, then find the frame that follows
+ //
+ // FIXME(emilio): This is really complex and probably shouldn't be.
+ if (aEndSkipChild) {
+ iter.Seek(aEndSkipChild);
+ iter.GetPreviousChild();
+ }
+ if (nsIFrame* nextSibling = FindNextSibling(iter, childDisplay)) {
+ aInsertion->mParentFrame =
+ nextSibling->GetParent()->GetContentInsertionFrame();
+ } else {
+ // No previous or next sibling, so treat this like an appended frame.
+ *aIsAppend = true;
+
+ // Deal with fieldsets.
+ aInsertion->mParentFrame =
+ ::GetAdjustedParentFrame(aInsertion->mParentFrame, aChild);
+
+ aInsertion->mParentFrame =
+ ::ContinuationToAppendTo(aInsertion->mParentFrame);
+
+ prevSibling = ::FindAppendPrevSibling(aInsertion->mParentFrame, nullptr);
+ }
+ }
+
+ *aIsRangeInsertSafe = childDisplay.isNothing();
+ return prevSibling;
+}
+
+nsContainerFrame* nsCSSFrameConstructor::GetContentInsertionFrameFor(
+ nsIContent* aContent) {
+ nsIFrame* frame;
+ while (!(frame = aContent->GetPrimaryFrame())) {
+ if (!IsDisplayContents(aContent)) {
+ return nullptr;
+ }
+
+ aContent = aContent->GetFlattenedTreeParent();
+ if (!aContent) {
+ return nullptr;
+ }
+ }
+
+ // If the content of the frame is not the desired content then this is not
+ // really a frame for the desired content.
+ // XXX This check is needed due to bug 135040. Remove it once that's fixed.
+ if (frame->GetContent() != aContent) {
+ return nullptr;
+ }
+
+ nsContainerFrame* insertionFrame = frame->GetContentInsertionFrame();
+
+ NS_ASSERTION(!insertionFrame || insertionFrame == frame || !frame->IsLeaf(),
+ "The insertion frame is the primary frame or the primary frame "
+ "isn't a leaf");
+
+ return insertionFrame;
+}
+
+static bool IsSpecialFramesetChild(nsIContent* aContent) {
+ // IMPORTANT: This must match the conditions in nsHTMLFramesetFrame::Init.
+ return aContent->IsAnyOfHTMLElements(nsGkAtoms::frameset, nsGkAtoms::frame);
+}
+
+static void InvalidateCanvasIfNeeded(PresShell* aPresShell, nsIContent* aNode);
+
+void nsCSSFrameConstructor::AddTextItemIfNeeded(
+ nsFrameConstructorState& aState, const InsertionPoint& aInsertion,
+ nsIContent* aPossibleTextContent, FrameConstructionItemList& aItems) {
+ MOZ_ASSERT(aPossibleTextContent, "Must have node");
+ if (!aPossibleTextContent->IsText() ||
+ !aPossibleTextContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) ||
+ aPossibleTextContent->HasFlag(NODE_NEEDS_FRAME)) {
+ // Not text, or not suppressed due to being all-whitespace (if it were being
+ // suppressed, it would have the NS_CREATE_FRAME_IF_NON_WHITESPACE flag), or
+ // going to be reframed anyway.
+ return;
+ }
+ MOZ_ASSERT(!aPossibleTextContent->GetPrimaryFrame(),
+ "Text node has a frame and NS_CREATE_FRAME_IF_NON_WHITESPACE");
+ AddFrameConstructionItems(aState, aPossibleTextContent, false, aInsertion,
+ aItems);
+}
+
+void nsCSSFrameConstructor::ReframeTextIfNeeded(nsIContent* aContent) {
+ if (!aContent->IsText() ||
+ !aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) ||
+ aContent->HasFlag(NODE_NEEDS_FRAME)) {
+ // Not text, or not suppressed due to being all-whitespace (if it were being
+ // suppressed, it would have the NS_CREATE_FRAME_IF_NON_WHITESPACE flag), or
+ // going to be reframed anyway.
+ return;
+ }
+ MOZ_ASSERT(!aContent->GetPrimaryFrame(),
+ "Text node has a frame and NS_CREATE_FRAME_IF_NON_WHITESPACE");
+ ContentInserted(aContent, InsertionKind::Async);
+}
+
+#ifdef DEBUG
+void nsCSSFrameConstructor::CheckBitsForLazyFrameConstruction(
+ nsIContent* aParent) {
+ // If we hit a node with no primary frame, or the NODE_NEEDS_FRAME bit set
+ // we want to assert, but leaf frames that process their own children and may
+ // ignore anonymous children (eg framesets) make this complicated. So we set
+ // these two booleans if we encounter these situations and unset them if we
+ // hit a node with a leaf frame.
+ //
+ // It's fine if one of node without primary frame is in a display:none
+ // subtree.
+ //
+ // Also, it's fine if one of the nodes without primary frame is a display:
+ // contents node.
+ bool noPrimaryFrame = false;
+ bool needsFrameBitSet = false;
+ nsIContent* content = aParent;
+ while (content && !content->HasFlag(NODE_DESCENDANTS_NEED_FRAMES)) {
+ if (content->GetPrimaryFrame() && content->GetPrimaryFrame()->IsLeaf()) {
+ noPrimaryFrame = needsFrameBitSet = false;
+ }
+ if (!noPrimaryFrame && !content->GetPrimaryFrame()) {
+ noPrimaryFrame = !IsDisplayContents(content);
+ }
+ if (!needsFrameBitSet && content->HasFlag(NODE_NEEDS_FRAME)) {
+ needsFrameBitSet = true;
+ }
+
+ content = content->GetFlattenedTreeParent();
+ }
+ if (content && content->GetPrimaryFrame() &&
+ content->GetPrimaryFrame()->IsLeaf()) {
+ noPrimaryFrame = needsFrameBitSet = false;
+ }
+ MOZ_ASSERT(!noPrimaryFrame,
+ "Ancestors of nodes with frames to be "
+ "constructed lazily should have frames");
+ MOZ_ASSERT(!needsFrameBitSet,
+ "Ancestors of nodes with frames to be "
+ "constructed lazily should not have NEEDS_FRAME bit set");
+}
+#endif
+
+// Returns true if this operation can be lazy, false if not.
+//
+// FIXME(emilio, bug 1410020): This function assumes that the flattened tree
+// parent of all the appended children is the same, which, afaict, is not
+// necessarily true.
+void nsCSSFrameConstructor::ConstructLazily(Operation aOperation,
+ nsIContent* aChild) {
+ MOZ_ASSERT(aChild->GetParent());
+
+ // We can construct lazily; just need to set suitable bits in the content
+ // tree.
+ Element* parent = aChild->GetFlattenedTreeParentElement();
+ if (!parent) {
+ // Not part of the flat tree, nothing to do.
+ return;
+ }
+
+ if (Servo_Element_IsDisplayNone(parent)) {
+ // Nothing to do either.
+ //
+ // FIXME(emilio): This should be an assert, except for weird <frameset>
+ // stuff that does its own frame construction. Such an assert would fire in
+ // layout/style/crashtests/1411478.html, for example.
+ return;
+ }
+
+ // Set NODE_NEEDS_FRAME on the new nodes.
+ if (aOperation == CONTENTINSERT) {
+ NS_ASSERTION(!aChild->GetPrimaryFrame() ||
+ aChild->GetPrimaryFrame()->GetContent() != aChild,
+ // XXX the aChild->GetPrimaryFrame()->GetContent() != aChild
+ // check is needed due to bug 135040. Remove it once that's
+ // fixed.
+ "setting NEEDS_FRAME on a node that already has a frame?");
+ aChild->SetFlags(NODE_NEEDS_FRAME);
+ } else { // CONTENTAPPEND
+ for (nsIContent* child = aChild; child; child = child->GetNextSibling()) {
+ NS_ASSERTION(!child->GetPrimaryFrame() ||
+ child->GetPrimaryFrame()->GetContent() != child,
+ // XXX the child->GetPrimaryFrame()->GetContent() != child
+ // check is needed due to bug 135040. Remove it once that's
+ // fixed.
+ "setting NEEDS_FRAME on a node that already has a frame?");
+ child->SetFlags(NODE_NEEDS_FRAME);
+ }
+ }
+
+ CheckBitsForLazyFrameConstruction(parent);
+ parent->NoteDescendantsNeedFramesForServo();
+}
+
+void nsCSSFrameConstructor::IssueSingleInsertNofications(
+ nsIContent* aStartChild, nsIContent* aEndChild,
+ InsertionKind aInsertionKind) {
+ for (nsIContent* child = aStartChild; child != aEndChild;
+ child = child->GetNextSibling()) {
+ MOZ_ASSERT(!child->GetPrimaryFrame());
+
+ // Call ContentRangeInserted with this node.
+ ContentRangeInserted(child, child->GetNextSibling(), aInsertionKind);
+ }
+}
+
+bool nsCSSFrameConstructor::InsertionPoint::IsMultiple() const {
+ // Fieldset frames have multiple normal flow child frame lists so handle it
+ // the same as if it had multiple content insertion points.
+ return mParentFrame && mParentFrame->IsFieldSetFrame();
+}
+
+nsCSSFrameConstructor::InsertionPoint
+nsCSSFrameConstructor::GetRangeInsertionPoint(nsIContent* aStartChild,
+ nsIContent* aEndChild,
+ InsertionKind aInsertionKind) {
+ MOZ_ASSERT(aStartChild);
+ MOZ_ASSERT(aStartChild->GetParent());
+
+ nsIContent* parent = aStartChild->GetParent();
+
+ // If the children of the container may be distributed to different insertion
+ // points, insert them separately and bail out, letting ContentInserted handle
+ // the mess.
+ if (parent->GetShadowRoot()) {
+ IssueSingleInsertNofications(aStartChild, aEndChild, aInsertionKind);
+ return {};
+ }
+
+#ifdef DEBUG
+ {
+ nsIContent* expectedParent = aStartChild->GetFlattenedTreeParent();
+ for (nsIContent* child = aStartChild->GetNextSibling(); child;
+ child = child->GetNextSibling()) {
+ MOZ_ASSERT(child->GetFlattenedTreeParent() == expectedParent);
+ }
+ }
+#endif
+
+ // Now the flattened tree parent of all the siblings is the same, just use the
+ // same insertion point and take the fast path, unless it's a multiple
+ // insertion point.
+ InsertionPoint ip = GetInsertionPoint(aStartChild);
+ if (ip.IsMultiple()) {
+ IssueSingleInsertNofications(aStartChild, aEndChild, aInsertionKind);
+ return {};
+ }
+
+ return ip;
+}
+
+bool nsCSSFrameConstructor::MaybeRecreateForFrameset(nsIFrame* aParentFrame,
+ nsIContent* aStartChild,
+ nsIContent* aEndChild) {
+ if (aParentFrame->IsFrameSetFrame()) {
+ // Check whether we have any kids we care about.
+ for (nsIContent* cur = aStartChild; cur != aEndChild;
+ cur = cur->GetNextSibling()) {
+ if (IsSpecialFramesetChild(cur)) {
+ // Just reframe the parent, since framesets are weird like that.
+ RecreateFramesForContent(aParentFrame->GetContent(),
+ InsertionKind::Async);
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+void nsCSSFrameConstructor::LazilyStyleNewChildRange(nsIContent* aStartChild,
+ nsIContent* aEndChild) {
+ for (nsIContent* child = aStartChild; child != aEndChild;
+ child = child->GetNextSibling()) {
+ if (child->IsElement()) {
+ child->AsElement()->NoteDirtyForServo();
+ }
+ }
+}
+
+#ifdef DEBUG
+static bool IsFlattenedTreeChild(nsIContent* aParent, nsIContent* aChild) {
+ FlattenedChildIterator iter(aParent);
+ for (nsIContent* node = iter.GetNextChild(); node;
+ node = iter.GetNextChild()) {
+ if (node == aChild) {
+ return true;
+ }
+ }
+ return false;
+}
+#endif
+
+void nsCSSFrameConstructor::StyleNewChildRange(nsIContent* aStartChild,
+ nsIContent* aEndChild) {
+ ServoStyleSet* styleSet = mPresShell->StyleSet();
+
+ for (nsIContent* child = aStartChild; child != aEndChild;
+ child = child->GetNextSibling()) {
+ if (!child->IsElement()) {
+ continue;
+ }
+
+ Element* childElement = child->AsElement();
+
+ // We only come in here from non-lazy frame construction, so the children
+ // should be unstyled.
+ MOZ_ASSERT(!childElement->HasServoData());
+
+#ifdef DEBUG
+ {
+ // Furthermore, all of them should have the same flattened tree parent
+ // (GetRangeInsertionPoint ensures it). And that parent should be styled,
+ // otherwise we would've never found an insertion point at all.
+ Element* parent = childElement->GetFlattenedTreeParentElement();
+ MOZ_ASSERT(parent);
+ MOZ_ASSERT(parent->HasServoData());
+ MOZ_ASSERT(
+ IsFlattenedTreeChild(parent, child),
+ "GetFlattenedTreeParent and ChildIterator don't agree, fix this!");
+ }
+#endif
+
+ styleSet->StyleNewSubtree(childElement);
+ }
+}
+
+nsIFrame* nsCSSFrameConstructor::FindNextSiblingForAppend(
+ const InsertionPoint& aInsertion) {
+ auto SlowPath = [&]() -> nsIFrame* {
+ FlattenedChildIterator iter(aInsertion.mContainer,
+ /* aStartAtBeginning = */ false);
+ iter.GetPreviousChild(); // Prime the iterator.
+ Maybe<StyleDisplay> unused;
+ return FindNextSibling(iter, unused);
+ };
+
+ if (!IsDisplayContents(aInsertion.mContainer) &&
+ !nsLayoutUtils::GetAfterFrame(aInsertion.mContainer)) {
+ MOZ_ASSERT(!SlowPath());
+ return nullptr;
+ }
+
+ return SlowPath();
+}
+
+void nsCSSFrameConstructor::ContentAppended(nsIContent* aFirstNewContent,
+ InsertionKind aInsertionKind) {
+ MOZ_ASSERT(aInsertionKind == InsertionKind::Sync ||
+ !RestyleManager()->IsInStyleRefresh());
+
+ AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ContentAppended",
+ LAYOUT_FrameConstruction);
+ AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
+
+#ifdef DEBUG
+ if (gNoisyContentUpdates) {
+ printf(
+ "nsCSSFrameConstructor::ContentAppended container=%p "
+ "first-child=%p lazy=%d\n",
+ aFirstNewContent->GetParent(), aFirstNewContent,
+ aInsertionKind == InsertionKind::Async);
+ if (gReallyNoisyContentUpdates && aFirstNewContent->GetParent()) {
+ aFirstNewContent->GetParent()->List(stdout, 0);
+ }
+ }
+
+ for (nsIContent* child = aFirstNewContent; child;
+ child = child->GetNextSibling()) {
+ // XXX the GetContent() != child check is needed due to bug 135040.
+ // Remove it once that's fixed.
+ MOZ_ASSERT(
+ !child->GetPrimaryFrame() ||
+ child->GetPrimaryFrame()->GetContent() != child,
+ "asked to construct a frame for a node that already has a frame");
+ }
+#endif
+
+ LAYOUT_PHASE_TEMP_EXIT();
+ InsertionPoint insertion =
+ GetRangeInsertionPoint(aFirstNewContent, nullptr, aInsertionKind);
+ nsContainerFrame*& parentFrame = insertion.mParentFrame;
+ LAYOUT_PHASE_TEMP_REENTER();
+ if (!parentFrame) {
+ // We're punting on frame construction because there's no container frame.
+ // The Servo-backed style system handles this case like the lazy frame
+ // construction case, except when we're already constructing frames, in
+ // which case we shouldn't need to do anything else.
+ if (aInsertionKind == InsertionKind::Async) {
+ LazilyStyleNewChildRange(aFirstNewContent, nullptr);
+ }
+ return;
+ }
+
+ if (aInsertionKind == InsertionKind::Async) {
+ ConstructLazily(CONTENTAPPEND, aFirstNewContent);
+ LazilyStyleNewChildRange(aFirstNewContent, nullptr);
+ return;
+ }
+
+ LAYOUT_PHASE_TEMP_EXIT();
+ if (MaybeRecreateForFrameset(parentFrame, aFirstNewContent, nullptr)) {
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+ LAYOUT_PHASE_TEMP_REENTER();
+
+ if (parentFrame->IsLeaf()) {
+ // Nothing to do here; we shouldn't be constructing kids of leaves
+ // Clear lazy bits so we don't try to construct again.
+ ClearLazyBits(aFirstNewContent, nullptr);
+ return;
+ }
+
+ LAYOUT_PHASE_TEMP_EXIT();
+ if (WipeInsertionParent(parentFrame)) {
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+ LAYOUT_PHASE_TEMP_REENTER();
+
+#ifdef DEBUG
+ if (gNoisyContentUpdates && IsFramePartOfIBSplit(parentFrame)) {
+ printf("nsCSSFrameConstructor::ContentAppended: parentFrame=");
+ parentFrame->ListTag(stdout);
+ printf(" is ib-split\n");
+ }
+#endif
+
+ // We should never get here with fieldsets, since they have
+ // multiple insertion points.
+ MOZ_ASSERT(!parentFrame->IsFieldSetFrame(),
+ "Parent frame should not be fieldset!");
+
+ nsIFrame* nextSibling = FindNextSiblingForAppend(insertion);
+ if (nextSibling) {
+ parentFrame = nextSibling->GetParent()->GetContentInsertionFrame();
+ } else {
+ parentFrame = ::ContinuationToAppendTo(parentFrame);
+ }
+
+ nsContainerFrame* containingBlock = GetFloatContainingBlock(parentFrame);
+
+ // See if the containing block has :first-letter style applied.
+ const bool haveFirstLetterStyle =
+ containingBlock && HasFirstLetterStyle(containingBlock);
+
+ const bool haveFirstLineStyle =
+ containingBlock && ShouldHaveFirstLineStyle(containingBlock->GetContent(),
+ containingBlock->Style());
+
+ if (haveFirstLetterStyle) {
+ AutoWeakFrame wf(nextSibling);
+
+ // Before we get going, remove the current letter frames
+ RemoveLetterFrames(mPresShell, containingBlock);
+
+ // Reget nextSibling, since we may have killed it.
+ //
+ // FIXME(emilio): This kinda sucks! :(
+ if (nextSibling && !wf) {
+ nextSibling = FindNextSiblingForAppend(insertion);
+ if (nextSibling) {
+ parentFrame = nextSibling->GetParent()->GetContentInsertionFrame();
+ containingBlock = GetFloatContainingBlock(parentFrame);
+ }
+ }
+ }
+
+ // Create some new frames
+ nsFrameConstructorState state(
+ mPresShell, GetAbsoluteContainingBlock(parentFrame, FIXED_POS),
+ GetAbsoluteContainingBlock(parentFrame, ABS_POS), containingBlock);
+
+ LayoutFrameType frameType = parentFrame->Type();
+
+ FlattenedChildIterator iter(insertion.mContainer);
+ const bool haveNoShadowDOM =
+ !iter.ShadowDOMInvolved() || !iter.GetNextChild();
+
+ AutoFrameConstructionItemList items(this);
+ if (aFirstNewContent->GetPreviousSibling() &&
+ GetParentType(frameType) == eTypeBlock && haveNoShadowDOM) {
+ // If there's a text node in the normal content list just before the new
+ // items, and it has no frame, make a frame construction item for it. If it
+ // doesn't need a frame, ConstructFramesFromItemList below won't give it
+ // one. No need to do all this if our parent type is not block, though,
+ // since WipeContainingBlock already handles that situation.
+ //
+ // Because we're appending, we don't need to worry about any text
+ // after the appended content; there can only be generated content
+ // (and bare text nodes are not generated). Native anonymous content
+ // generated by frames never participates in inline layout.
+ AddTextItemIfNeeded(state, insertion,
+ aFirstNewContent->GetPreviousSibling(), items);
+ }
+ for (nsIContent* child = aFirstNewContent; child;
+ child = child->GetNextSibling()) {
+ AddFrameConstructionItems(state, child, false, insertion, items);
+ }
+
+ nsIFrame* prevSibling = ::FindAppendPrevSibling(parentFrame, nextSibling);
+
+ // Perform special check for diddling around with the frames in
+ // a ib-split inline frame.
+ // If we're appending before :after content, then we're not really
+ // appending, so let WipeContainingBlock know that.
+ LAYOUT_PHASE_TEMP_EXIT();
+ if (WipeContainingBlock(state, containingBlock, parentFrame, items, true,
+ prevSibling)) {
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+ LAYOUT_PHASE_TEMP_REENTER();
+
+ // If the parent is a block frame, and we're not in a special case
+ // where frames can be moved around, determine if the list is for the
+ // start or end of the block.
+ if (parentFrame->IsBlockFrameOrSubclass() && !haveFirstLetterStyle &&
+ !haveFirstLineStyle && !IsFramePartOfIBSplit(parentFrame)) {
+ items.SetLineBoundaryAtStart(!prevSibling ||
+ !prevSibling->IsInlineOutside() ||
+ prevSibling->IsBrFrame());
+ // :after content can't be <br> so no need to check it
+ //
+ // FIXME(emilio): A display: contents sibling could! Write a test-case and
+ // fix.
+ items.SetLineBoundaryAtEnd(!nextSibling || !nextSibling->IsInlineOutside());
+ }
+ // To suppress whitespace-only text frames, we have to verify that
+ // our container's DOM child list matches its flattened tree child list.
+ items.SetParentHasNoShadowDOM(haveNoShadowDOM);
+
+ nsFrameList frameList;
+ ConstructFramesFromItemList(state, items, parentFrame,
+ ParentIsWrapperAnonBox(parentFrame), frameList);
+
+ for (nsIContent* child = aFirstNewContent; child;
+ child = child->GetNextSibling()) {
+ // Invalidate now instead of before the WipeContainingBlock call, just in
+ // case we do wipe; in that case we don't need to do this walk at all.
+ // XXXbz does that matter? Would it make more sense to save some virtual
+ // GetChildAt_Deprecated calls instead and do this during construction of
+ // our FrameConstructionItemList?
+ InvalidateCanvasIfNeeded(mPresShell, child);
+ }
+
+ // If the container is a table and a caption was appended, it needs to be put
+ // in the table wrapper frame's additional child list.
+ nsFrameList captionList;
+ if (LayoutFrameType::Table == frameType) {
+ // Pull out the captions. Note that we don't want to do that as we go,
+ // because processing a single caption can add a whole bunch of things to
+ // the frame items due to pseudoframe processing. So we'd have to pull
+ // captions from a list anyway; might as well do that here.
+ // XXXbz this is no longer true; we could pull captions directly out of the
+ // FrameConstructionItemList now.
+ PullOutCaptionFrames(frameList, captionList);
+ }
+
+ if (haveFirstLineStyle && parentFrame == containingBlock) {
+ // It's possible that some of the new frames go into a
+ // first-line frame. Look at them and see...
+ AppendFirstLineFrames(state, containingBlock->GetContent(), containingBlock,
+ frameList);
+ // That moved things into line frames as needed, reparenting their
+ // styles. Nothing else needs to be done.
+ } else if (parentFrame->Style()->HasPseudoElementData()) {
+ // parentFrame might be inside a ::first-line frame. Check whether it is,
+ // and if so fix up our styles.
+ CheckForFirstLineInsertion(parentFrame, frameList);
+ CheckForFirstLineInsertion(parentFrame, captionList);
+ }
+
+ // Notify the parent frame passing it the list of new frames
+ // Append the flowed frames to the principal child list; captions
+ // need special treatment
+ if (captionList.NotEmpty()) { // append the caption to the table wrapper
+ NS_ASSERTION(LayoutFrameType::Table == frameType, "how did that happen?");
+ nsContainerFrame* outerTable = parentFrame->GetParent();
+ captionList.ApplySetParent(outerTable);
+ AppendFrames(outerTable, nsIFrame::kCaptionList, captionList);
+ }
+
+ LAYOUT_PHASE_TEMP_EXIT();
+ if (MaybeRecreateForColumnSpan(state, parentFrame, frameList, prevSibling)) {
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+ LAYOUT_PHASE_TEMP_REENTER();
+
+ if (frameList.NotEmpty()) { // append the in-flow kids
+ AppendFramesToParent(state, parentFrame, frameList, prevSibling);
+ }
+
+ // Recover first-letter frames
+ if (haveFirstLetterStyle) {
+ RecoverLetterFrames(containingBlock);
+ }
+
+#ifdef DEBUG
+ if (gReallyNoisyContentUpdates) {
+ printf("nsCSSFrameConstructor::ContentAppended: resulting frame model:\n");
+ parentFrame->List(stdout);
+ }
+#endif
+
+#ifdef ACCESSIBILITY
+ if (nsAccessibilityService* accService =
+ PresShell::GetAccessibilityService()) {
+ accService->ContentRangeInserted(mPresShell, aFirstNewContent, nullptr);
+ }
+#endif
+}
+
+void nsCSSFrameConstructor::ContentInserted(nsIContent* aChild,
+ InsertionKind aInsertionKind) {
+ ContentRangeInserted(aChild, aChild->GetNextSibling(), aInsertionKind);
+}
+
+// ContentRangeInserted handles creating frames for a range of nodes that
+// aren't at the end of their childlist. ContentRangeInserted isn't a real
+// content notification, but rather it handles regular ContentInserted calls
+// for a single node as well as the lazy construction of frames for a range of
+// nodes when called from CreateNeededFrames. For a range of nodes to be
+// suitable to have its frames constructed all at once they must meet the same
+// conditions that ContentAppended imposes (GetRangeInsertionPoint checks
+// these), plus more. Namely when finding the insertion prevsibling we must not
+// need to consult something specific to any one node in the range, so that the
+// insertion prevsibling would be the same for each node in the range. So we
+// pass the first node in the range to GetInsertionPrevSibling, and if
+// IsValidSibling (the only place GetInsertionPrevSibling might look at the
+// passed in node itself) needs to resolve style on the node we record this and
+// return that this range needs to be split up and inserted separately. Table
+// captions need extra attention as we need to determine where to insert them
+// in the caption list, while skipping any nodes in the range being inserted
+// (because when we treat the caption frames the other nodes have had their
+// frames constructed but not yet inserted into the frame tree).
+void nsCSSFrameConstructor::ContentRangeInserted(nsIContent* aStartChild,
+ nsIContent* aEndChild,
+ InsertionKind aInsertionKind) {
+ MOZ_ASSERT(aInsertionKind == InsertionKind::Sync ||
+ !RestyleManager()->IsInStyleRefresh());
+
+ AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ContentRangeInserted",
+ LAYOUT_FrameConstruction);
+ AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
+
+ MOZ_ASSERT(aStartChild, "must always pass a child");
+
+#ifdef DEBUG
+ if (gNoisyContentUpdates) {
+ printf(
+ "nsCSSFrameConstructor::ContentRangeInserted container=%p "
+ "start-child=%p end-child=%p lazy=%d\n",
+ aStartChild->GetParent(), aStartChild, aEndChild,
+ aInsertionKind == InsertionKind::Async);
+ if (gReallyNoisyContentUpdates) {
+ if (aStartChild->GetParent()) {
+ aStartChild->GetParent()->List(stdout, 0);
+ } else {
+ aStartChild->List(stdout, 0);
+ }
+ }
+ }
+
+ for (nsIContent* child = aStartChild; child != aEndChild;
+ child = child->GetNextSibling()) {
+ // XXX the GetContent() != child check is needed due to bug 135040.
+ // Remove it once that's fixed.
+ NS_ASSERTION(
+ !child->GetPrimaryFrame() ||
+ child->GetPrimaryFrame()->GetContent() != child,
+ "asked to construct a frame for a node that already has a frame");
+ }
+#endif
+
+ bool isSingleInsert = (aStartChild->GetNextSibling() == aEndChild);
+ NS_ASSERTION(isSingleInsert || aInsertionKind == InsertionKind::Sync,
+ "range insert shouldn't be lazy");
+ NS_ASSERTION(isSingleInsert || aEndChild,
+ "range should not include all nodes after aStartChild");
+
+ // If we have a null parent, then this must be the document element being
+ // inserted, or some other child of the document in the DOM (might be a PI,
+ // say).
+ if (!aStartChild->GetParent()) {
+ MOZ_ASSERT(isSingleInsert,
+ "root node insertion should be a single insertion");
+ Element* docElement = mDocument->GetRootElement();
+
+ if (aStartChild != docElement) {
+ // Not the root element; just bail out
+ return;
+ }
+
+ MOZ_ASSERT(!mRootElementFrame, "root element frame already created");
+
+ // Create frames for the document element and its child elements
+ if (ConstructDocElementFrame(docElement)) {
+ InvalidateCanvasIfNeeded(mPresShell, aStartChild);
+#ifdef DEBUG
+ if (gReallyNoisyContentUpdates) {
+ printf(
+ "nsCSSFrameConstructor::ContentRangeInserted: resulting frame "
+ "model:\n");
+ mRootElementFrame->List(stdout);
+ }
+#endif
+ }
+
+#ifdef ACCESSIBILITY
+ if (nsAccessibilityService* accService =
+ PresShell::GetAccessibilityService()) {
+ accService->ContentRangeInserted(mPresShell, aStartChild, aEndChild);
+ }
+#endif
+
+ return;
+ }
+
+ InsertionPoint insertion;
+ if (isSingleInsert) {
+ // See if we have a Shadow DOM insertion point. If so, then that's our real
+ // parent frame; if not, then the frame hasn't been built yet and we just
+ // bail.
+ insertion = GetInsertionPoint(aStartChild);
+ } else {
+ // Get our insertion point. If we need to issue single ContentInserteds
+ // GetRangeInsertionPoint will take care of that for us.
+ LAYOUT_PHASE_TEMP_EXIT();
+ insertion = GetRangeInsertionPoint(aStartChild, aEndChild, aInsertionKind);
+ LAYOUT_PHASE_TEMP_REENTER();
+ }
+
+ if (!insertion.mParentFrame) {
+ // We're punting on frame construction because there's no container frame.
+ // The Servo-backed style system handles this case like the lazy frame
+ // construction case, except when we're already constructing frames, in
+ // which case we shouldn't need to do anything else.
+ if (aInsertionKind == InsertionKind::Async) {
+ LazilyStyleNewChildRange(aStartChild, aEndChild);
+ }
+ return;
+ }
+
+ if (aInsertionKind == InsertionKind::Async) {
+ ConstructLazily(CONTENTINSERT, aStartChild);
+ LazilyStyleNewChildRange(aStartChild, aEndChild);
+ return;
+ }
+
+ bool isAppend, isRangeInsertSafe;
+ nsIFrame* prevSibling = GetInsertionPrevSibling(
+ &insertion, aStartChild, &isAppend, &isRangeInsertSafe);
+
+ // check if range insert is safe
+ if (!isSingleInsert && !isRangeInsertSafe) {
+ // must fall back to a single ContertInserted for each child in the range
+ LAYOUT_PHASE_TEMP_EXIT();
+ IssueSingleInsertNofications(aStartChild, aEndChild, InsertionKind::Sync);
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+
+ LayoutFrameType frameType = insertion.mParentFrame->Type();
+ LAYOUT_PHASE_TEMP_EXIT();
+ if (MaybeRecreateForFrameset(insertion.mParentFrame, aStartChild,
+ aEndChild)) {
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+ LAYOUT_PHASE_TEMP_REENTER();
+
+ // We should only get here with fieldsets when doing a single insert, because
+ // fieldsets have multiple insertion points.
+ NS_ASSERTION(isSingleInsert || frameType != LayoutFrameType::FieldSet,
+ "Unexpected parent");
+ if (IsFrameForFieldSet(insertion.mParentFrame) &&
+ aStartChild->NodeInfo()->NameAtom() == nsGkAtoms::legend) {
+ // Just reframe the parent, since figuring out whether this
+ // should be the new legend and then handling it is too complex.
+ // We could do a little better here --- check if the fieldset already
+ // has a legend which occurs earlier in its child list than this node,
+ // and if so, proceed. But we'd have to extend nsFieldSetFrame
+ // to locate this legend in the inserted frames and extract it.
+ LAYOUT_PHASE_TEMP_EXIT();
+ RecreateFramesForContent(insertion.mParentFrame->GetContent(),
+ InsertionKind::Async);
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+
+ // Don't construct kids of leaves
+ if (insertion.mParentFrame->IsLeaf()) {
+ // Clear lazy bits so we don't try to construct again.
+ ClearLazyBits(aStartChild, aEndChild);
+ return;
+ }
+
+ LAYOUT_PHASE_TEMP_EXIT();
+ if (WipeInsertionParent(insertion.mParentFrame)) {
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+ LAYOUT_PHASE_TEMP_REENTER();
+
+ nsFrameConstructorState state(
+ mPresShell, GetAbsoluteContainingBlock(insertion.mParentFrame, FIXED_POS),
+ GetAbsoluteContainingBlock(insertion.mParentFrame, ABS_POS),
+ GetFloatContainingBlock(insertion.mParentFrame),
+ do_AddRef(mFrameTreeState));
+
+ // Recover state for the containing block - we need to know if
+ // it has :first-letter or :first-line style applied to it. The
+ // reason we care is that the internal structure in these cases
+ // is not the normal structure and requires custom updating
+ // logic.
+ nsContainerFrame* containingBlock = state.mFloatedList.containingBlock;
+ bool haveFirstLetterStyle = false;
+ bool haveFirstLineStyle = false;
+
+ // In order to shave off some cycles, we only dig up the
+ // containing block haveFirst* flags if the parent frame where
+ // the insertion/append is occurring is an inline or block
+ // container. For other types of containers this isn't relevant.
+ StyleDisplayInside parentDisplayInside =
+ insertion.mParentFrame->StyleDisplay()->DisplayInside();
+
+ // Examine the insertion.mParentFrame where the insertion is taking
+ // place. If it's a certain kind of container then some special
+ // processing is done.
+ if (StyleDisplayInside::Flow == parentDisplayInside) {
+ // Recover the special style flags for the containing block
+ if (containingBlock) {
+ haveFirstLetterStyle = HasFirstLetterStyle(containingBlock);
+ haveFirstLineStyle = ShouldHaveFirstLineStyle(
+ containingBlock->GetContent(), containingBlock->Style());
+ }
+
+ if (haveFirstLetterStyle) {
+ // If our current insertion.mParentFrame is a Letter frame, use its parent
+ // as our new parent hint
+ if (insertion.mParentFrame->IsLetterFrame()) {
+ // If insertion.mParentFrame is out of flow, then we actually want the
+ // parent of the placeholder frame.
+ if (insertion.mParentFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
+ nsPlaceholderFrame* placeholderFrame =
+ insertion.mParentFrame->GetPlaceholderFrame();
+ NS_ASSERTION(placeholderFrame, "No placeholder for out-of-flow?");
+ insertion.mParentFrame = placeholderFrame->GetParent();
+ } else {
+ insertion.mParentFrame = insertion.mParentFrame->GetParent();
+ }
+ }
+
+ // Remove the old letter frames before doing the insertion
+ RemoveLetterFrames(mPresShell, state.mFloatedList.containingBlock);
+
+ // Removing the letterframes messes around with the frame tree, removing
+ // and creating frames. We need to reget our prevsibling, parent frame,
+ // etc.
+ prevSibling = GetInsertionPrevSibling(&insertion, aStartChild, &isAppend,
+ &isRangeInsertSafe);
+
+ // Need check whether a range insert is still safe.
+ if (!isSingleInsert && !isRangeInsertSafe) {
+ // Need to recover the letter frames first.
+ RecoverLetterFrames(state.mFloatedList.containingBlock);
+
+ // must fall back to a single ContertInserted for each child in the
+ // range
+ LAYOUT_PHASE_TEMP_EXIT();
+ IssueSingleInsertNofications(aStartChild, aEndChild,
+ InsertionKind::Sync);
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+
+ frameType = insertion.mParentFrame->Type();
+ }
+ }
+
+ AutoFrameConstructionItemList items(this);
+ ParentType parentType = GetParentType(frameType);
+ FlattenedChildIterator iter(insertion.mContainer);
+ const bool haveNoShadowDOM =
+ !iter.ShadowDOMInvolved() || !iter.GetNextChild();
+ if (aStartChild->GetPreviousSibling() && parentType == eTypeBlock &&
+ haveNoShadowDOM) {
+ // If there's a text node in the normal content list just before the
+ // new nodes, and it has no frame, make a frame construction item for
+ // it, because it might need a frame now. No need to do this if our
+ // parent type is not block, though, since WipeContainingBlock
+ // already handles that situation.
+ AddTextItemIfNeeded(state, insertion, aStartChild->GetPreviousSibling(),
+ items);
+ }
+
+ if (isSingleInsert) {
+ AddFrameConstructionItems(state, aStartChild,
+ aStartChild->IsRootOfNativeAnonymousSubtree(),
+ insertion, items);
+ } else {
+ for (nsIContent* child = aStartChild; child != aEndChild;
+ child = child->GetNextSibling()) {
+ AddFrameConstructionItems(state, child, false, insertion, items);
+ }
+ }
+
+ if (aEndChild && parentType == eTypeBlock && haveNoShadowDOM) {
+ // If there's a text node in the normal content list just after the
+ // new nodes, and it has no frame, make a frame construction item for
+ // it, because it might need a frame now. No need to do this if our
+ // parent type is not block, though, since WipeContainingBlock
+ // already handles that situation.
+ AddTextItemIfNeeded(state, insertion, aEndChild, items);
+ }
+
+ // Perform special check for diddling around with the frames in
+ // a special inline frame.
+ // If we're appending before :after content, then we're not really
+ // appending, so let WipeContainingBlock know that.
+ LAYOUT_PHASE_TEMP_EXIT();
+ if (WipeContainingBlock(state, containingBlock, insertion.mParentFrame, items,
+ isAppend, prevSibling)) {
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+ LAYOUT_PHASE_TEMP_REENTER();
+
+ // If the container is a table and a caption will be appended, it needs to be
+ // put in the table wrapper frame's additional child list.
+ // We make no attempt here to set flags to indicate whether the list
+ // will be at the start or end of a block. It doesn't seem worthwhile.
+ nsFrameList frameList, captionList;
+ ConstructFramesFromItemList(state, items, insertion.mParentFrame,
+ ParentIsWrapperAnonBox(insertion.mParentFrame),
+ frameList);
+
+ if (frameList.NotEmpty()) {
+ for (nsIContent* child = aStartChild; child != aEndChild;
+ child = child->GetNextSibling()) {
+ InvalidateCanvasIfNeeded(mPresShell, child);
+ }
+
+ if (LayoutFrameType::Table == frameType ||
+ LayoutFrameType::TableWrapper == frameType) {
+ PullOutCaptionFrames(frameList, captionList);
+ }
+ }
+
+ if (haveFirstLineStyle && insertion.mParentFrame == containingBlock &&
+ isAppend) {
+ // It's possible that the new frame goes into a first-line
+ // frame. Look at it and see...
+ AppendFirstLineFrames(state, containingBlock->GetContent(), containingBlock,
+ frameList);
+ } else if (insertion.mParentFrame->Style()->HasPseudoElementData()) {
+ CheckForFirstLineInsertion(insertion.mParentFrame, frameList);
+ CheckForFirstLineInsertion(insertion.mParentFrame, captionList);
+ }
+
+ // We might have captions; put them into the caption list of the
+ // table wrapper frame.
+ if (captionList.NotEmpty()) {
+ NS_ASSERTION(LayoutFrameType::Table == frameType ||
+ LayoutFrameType::TableWrapper == frameType,
+ "parent for caption is not table?");
+ // We need to determine where to put the caption items; start with the
+ // the parent frame that has already been determined and get the insertion
+ // prevsibling of the first caption item.
+ bool captionIsAppend;
+ nsIFrame* captionPrevSibling = nullptr;
+
+ // aIsRangeInsertSafe is ignored on purpose because it is irrelevant here.
+ bool ignored;
+ InsertionPoint captionInsertion(insertion.mParentFrame,
+ insertion.mContainer);
+ if (isSingleInsert) {
+ captionPrevSibling = GetInsertionPrevSibling(
+ &captionInsertion, aStartChild, &captionIsAppend, &ignored);
+ } else {
+ nsIContent* firstCaption = captionList.FirstChild()->GetContent();
+ // It is very important here that we skip the children in
+ // [aStartChild,aEndChild) when looking for a
+ // prevsibling.
+ captionPrevSibling = GetInsertionPrevSibling(
+ &captionInsertion, firstCaption, &captionIsAppend, &ignored,
+ aStartChild, aEndChild);
+ }
+
+ nsContainerFrame* outerTable =
+ captionInsertion.mParentFrame->IsTableFrame()
+ ? captionInsertion.mParentFrame->GetParent()
+ : captionInsertion.mParentFrame;
+
+ // If the parent is not a table wrapper frame we will try to add frames
+ // to a named child list that the parent does not honor and the frames
+ // will get lost.
+ MOZ_ASSERT(outerTable->IsTableWrapperFrame(),
+ "Pseudo frame construction failure; "
+ "a caption can be only a child of a table wrapper frame");
+
+ // If the parent of our current prevSibling is different from the frame
+ // we'll actually use as the parent, then the calculated insertion
+ // point is now invalid (bug 341382).
+ if (captionPrevSibling && captionPrevSibling->GetParent() != outerTable) {
+ captionPrevSibling = nullptr;
+ }
+
+ captionList.ApplySetParent(outerTable);
+ if (captionIsAppend) {
+ AppendFrames(outerTable, nsIFrame::kCaptionList, captionList);
+ } else {
+ InsertFrames(outerTable, nsIFrame::kCaptionList, captionPrevSibling,
+ captionList);
+ }
+ }
+
+ LAYOUT_PHASE_TEMP_EXIT();
+ if (MaybeRecreateForColumnSpan(state, insertion.mParentFrame, frameList,
+ prevSibling)) {
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+ LAYOUT_PHASE_TEMP_REENTER();
+
+ if (frameList.NotEmpty()) {
+ // Notify the parent frame
+ if (isAppend) {
+ AppendFramesToParent(state, insertion.mParentFrame, frameList,
+ prevSibling);
+ } else {
+ InsertFrames(insertion.mParentFrame, kPrincipalList, prevSibling,
+ frameList);
+ }
+ }
+
+ if (haveFirstLetterStyle) {
+ // Recover the letter frames for the containing block when
+ // it has first-letter style.
+ RecoverLetterFrames(state.mFloatedList.containingBlock);
+ }
+
+#ifdef DEBUG
+ if (gReallyNoisyContentUpdates && insertion.mParentFrame) {
+ printf(
+ "nsCSSFrameConstructor::ContentRangeInserted: resulting frame "
+ "model:\n");
+ insertion.mParentFrame->List(stdout);
+ }
+#endif
+
+#ifdef ACCESSIBILITY
+ if (nsAccessibilityService* accService =
+ PresShell::GetAccessibilityService()) {
+ accService->ContentRangeInserted(mPresShell, aStartChild, aEndChild);
+ }
+#endif
+}
+
+bool nsCSSFrameConstructor::ContentRemoved(nsIContent* aChild,
+ nsIContent* aOldNextSibling,
+ RemoveFlags aFlags) {
+ MOZ_ASSERT(aChild);
+ MOZ_ASSERT(!aChild->IsRootOfNativeAnonymousSubtree() || !aOldNextSibling,
+ "Anonymous roots don't have siblings");
+ AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ContentRemoved",
+ LAYOUT_FrameConstruction);
+ AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
+ nsPresContext* presContext = mPresShell->GetPresContext();
+ MOZ_ASSERT(presContext, "Our presShell should have a valid presContext");
+
+ // We want to detect when the viewport override element stored in the
+ // prescontext is in the subtree being removed. Except in fullscreen cases
+ // (which are handled in Element::UnbindFromTree and do not get stored on the
+ // prescontext), the override element is always either the root element or a
+ // <body> child of the root element. So we can only be removing the stored
+ // override element if the thing being removed is either the override element
+ // itself or the root element (which can be a parent of the override element).
+ if (aChild == presContext->GetViewportScrollStylesOverrideElement() ||
+ (aChild->IsElement() && !aChild->GetParent())) {
+ // We might be removing the element that we propagated viewport scrollbar
+ // styles from. Recompute those. (This clause covers two of the three
+ // possible scrollbar-propagation sources: the <body> [as aChild or a
+ // descendant] and the root node. The other possible scrollbar-propagation
+ // source is a fullscreen element, and we have code elsewhere to update
+ // scrollbars after fullscreen elements are removed -- specifically, it's
+ // part of the fullscreen cleanup code called by Element::UnbindFromTree.
+ // We don't handle the fullscreen case here, because it doesn't change the
+ // scrollbar styles override element stored on the prescontext.)
+ Element* newOverrideElement =
+ presContext->UpdateViewportScrollStylesOverride();
+
+ // If aChild is the root, then we don't need to do any reframing of
+ // newOverrideElement, because we're about to tear down the whole frame tree
+ // anyway. And we need to make sure we don't do any such reframing, because
+ // reframing the <body> can trigger a reframe of the <html> and then reenter
+ // here.
+ //
+ // But if aChild is not the root, and if newOverrideElement is not
+ // the root and isn't aChild (which it could be if all we're doing
+ // here is reframing the current override element), it needs
+ // reframing. In particular, it used to have a scrollframe
+ // (because its overflow was not "visible"), but now it will
+ // propagate its overflow to the viewport, so it should not need a
+ // scrollframe anymore.
+ if (aChild->GetParent() && newOverrideElement &&
+ newOverrideElement->GetParent() && newOverrideElement != aChild) {
+ LAYOUT_PHASE_TEMP_EXIT();
+ RecreateFramesForContent(newOverrideElement, InsertionKind::Async);
+ LAYOUT_PHASE_TEMP_REENTER();
+ }
+ }
+
+#ifdef DEBUG
+ if (gNoisyContentUpdates) {
+ printf(
+ "nsCSSFrameConstructor::ContentRemoved container=%p child=%p "
+ "old-next-sibling=%p\n",
+ aChild->GetParent(), aChild, aOldNextSibling);
+ if (gReallyNoisyContentUpdates) {
+ aChild->GetParent()->List(stdout, 0);
+ }
+ }
+#endif
+
+ nsIFrame* childFrame = aChild->GetPrimaryFrame();
+ if (!childFrame || childFrame->GetContent() != aChild) {
+ // XXXbz the GetContent() != aChild check is needed due to bug 135040.
+ // Remove it once that's fixed.
+ childFrame = nullptr;
+ }
+
+ // If we're removing the root, then make sure to remove things starting at
+ // the viewport's child instead of the primary frame (which might even be
+ // null if the root was display:none, even though the frames above it got
+ // created). Detecting removal of a root is a little exciting; in particular,
+ // having no parent is necessary but NOT sufficient.
+ //
+ // Due to how we process reframes, the content node might not even be in our
+ // document by now. So explicitly check whether the viewport's first kid's
+ // content node is aChild.
+ //
+ // FIXME(emilio): I think the "might not be in our document" bit is impossible
+ // now.
+ bool isRoot = false;
+ if (!aChild->GetParent()) {
+ if (nsIFrame* viewport = GetRootFrame()) {
+ nsIFrame* firstChild = viewport->PrincipalChildList().FirstChild();
+ if (firstChild && firstChild->GetContent() == aChild) {
+ isRoot = true;
+ childFrame = firstChild;
+ NS_ASSERTION(!childFrame->GetNextSibling(), "How did that happen?");
+ }
+ }
+ }
+
+ // We need to be conservative about when to determine whether something has
+ // display: contents or not because at this point our actual display may be
+ // different.
+ //
+ // Consider the case of:
+ //
+ // <div id="A" style="display: contents"><div id="B"></div></div>
+ //
+ // If we reconstruct A because its display changed to "none", we still need to
+ // cleanup the frame on B, but A's display is now "none", so we can't poke at
+ // the style of it.
+ //
+ // FIXME(emilio, bug 1450366): We can make this faster without adding much
+ // complexity for the display: none -> other case, which right now
+ // unnecessarily walks the content tree down.
+ auto CouldHaveBeenDisplayContents = [aFlags](nsIContent* aContent) -> bool {
+ return aFlags == REMOVE_FOR_RECONSTRUCTION || IsDisplayContents(aContent);
+ };
+
+ if (!childFrame && CouldHaveBeenDisplayContents(aChild)) {
+ // NOTE(emilio): We may iterate through ::before and ::after here and they
+ // may be gone after the respective ContentRemoved call. Right now
+ // StyleChildrenIterator handles that properly, so it's not an issue.
+ StyleChildrenIterator iter(aChild);
+ for (nsIContent* c = iter.GetNextChild(); c; c = iter.GetNextChild()) {
+ if (c->GetPrimaryFrame() || CouldHaveBeenDisplayContents(c)) {
+ LAYOUT_PHASE_TEMP_EXIT();
+ bool didReconstruct = ContentRemoved(c, nullptr, aFlags);
+ LAYOUT_PHASE_TEMP_REENTER();
+ if (didReconstruct) {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ if (childFrame) {
+ if (aFlags == REMOVE_FOR_RECONSTRUCTION) {
+ // Before removing the frames associated with the content object,
+ // ask them to save their state onto our state object.
+ CaptureStateForFramesOf(aChild, mFrameTreeState);
+ }
+
+ InvalidateCanvasIfNeeded(mPresShell, aChild);
+
+ // See whether we need to remove more than just childFrame
+ LAYOUT_PHASE_TEMP_EXIT();
+ if (MaybeRecreateContainerForFrameRemoval(childFrame)) {
+ LAYOUT_PHASE_TEMP_REENTER();
+ return true;
+ }
+ LAYOUT_PHASE_TEMP_REENTER();
+
+ // Get the childFrame's parent frame
+ nsIFrame* parentFrame = childFrame->GetParent();
+ LayoutFrameType parentType = parentFrame->Type();
+
+ if (parentType == LayoutFrameType::FrameSet &&
+ IsSpecialFramesetChild(aChild)) {
+ // Just reframe the parent, since framesets are weird like that.
+ LAYOUT_PHASE_TEMP_EXIT();
+ RecreateFramesForContent(parentFrame->GetContent(), InsertionKind::Async);
+ LAYOUT_PHASE_TEMP_REENTER();
+ return true;
+ }
+
+ // If we're a child of MathML, then we should reframe the MathML content.
+ // If we're non-MathML, then we would be wrapped in a block so we need to
+ // check our grandparent in that case.
+ nsIFrame* possibleMathMLAncestor = parentType == LayoutFrameType::Block
+ ? parentFrame->GetParent()
+ : parentFrame;
+ if (possibleMathMLAncestor->IsFrameOfType(nsIFrame::eMathML)) {
+ LAYOUT_PHASE_TEMP_EXIT();
+ RecreateFramesForContent(parentFrame->GetContent(), InsertionKind::Async);
+ LAYOUT_PHASE_TEMP_REENTER();
+ return true;
+ }
+
+ // Undo XUL wrapping if it's no longer needed.
+ // (If we're in the XUL block-wrapping situation, parentFrame is the
+ // wrapper frame.)
+ nsIFrame* grandparentFrame = parentFrame->GetParent();
+ if (grandparentFrame && grandparentFrame->IsXULBoxFrame() &&
+ grandparentFrame->HasAnyStateBits(NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK) &&
+ // check if this frame is the only one needing wrapping
+ aChild == AnyKidsNeedBlockParent(
+ parentFrame->PrincipalChildList().FirstChild()) &&
+ !AnyKidsNeedBlockParent(childFrame->GetNextSibling())) {
+ LAYOUT_PHASE_TEMP_EXIT();
+ RecreateFramesForContent(grandparentFrame->GetContent(),
+ InsertionKind::Async);
+ LAYOUT_PHASE_TEMP_REENTER();
+ return true;
+ }
+
+#ifdef ACCESSIBILITY
+ if (aFlags != REMOVE_FOR_RECONSTRUCTION) {
+ if (nsAccessibilityService* accService =
+ PresShell::GetAccessibilityService()) {
+ accService->ContentRemoved(mPresShell, aChild);
+ }
+ }
+#endif
+
+ // Examine the containing-block for the removed content and see if
+ // :first-letter style applies.
+ nsIFrame* inflowChild = childFrame;
+ if (childFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
+ inflowChild = childFrame->GetPlaceholderFrame();
+ NS_ASSERTION(inflowChild, "No placeholder for out-of-flow?");
+ }
+ nsContainerFrame* containingBlock =
+ GetFloatContainingBlock(inflowChild->GetParent());
+ bool haveFLS = containingBlock && HasFirstLetterStyle(containingBlock);
+ if (haveFLS) {
+ // Trap out to special routine that handles adjusting a blocks
+ // frame tree when first-letter style is present.
+#ifdef NOISY_FIRST_LETTER
+ printf("ContentRemoved: containingBlock=");
+ containingBlock->ListTag(stdout);
+ printf(" parentFrame=");
+ parentFrame->ListTag(stdout);
+ printf(" childFrame=");
+ childFrame->ListTag(stdout);
+ printf("\n");
+#endif
+
+ // First update the containing blocks structure by removing the
+ // existing letter frames. This makes the subsequent logic
+ // simpler.
+ RemoveLetterFrames(mPresShell, containingBlock);
+
+ // Recover childFrame and parentFrame
+ childFrame = aChild->GetPrimaryFrame();
+ if (!childFrame || childFrame->GetContent() != aChild) {
+ // XXXbz the GetContent() != aChild check is needed due to bug 135040.
+ // Remove it once that's fixed.
+ return false;
+ }
+ parentFrame = childFrame->GetParent();
+ parentType = parentFrame->Type();
+
+#ifdef NOISY_FIRST_LETTER
+ printf(" ==> revised parentFrame=");
+ parentFrame->ListTag(stdout);
+ printf(" childFrame=");
+ childFrame->ListTag(stdout);
+ printf("\n");
+#endif
+ }
+
+#ifdef DEBUG
+ if (gReallyNoisyContentUpdates) {
+ printf("nsCSSFrameConstructor::ContentRemoved: childFrame=");
+ childFrame->ListTag(stdout);
+ putchar('\n');
+ parentFrame->List(stdout);
+ }
+#endif
+
+ // Notify the parent frame that it should delete the frame
+ if (childFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
+ childFrame = childFrame->GetPlaceholderFrame();
+ NS_ASSERTION(childFrame, "Missing placeholder frame for out of flow.");
+ parentFrame = childFrame->GetParent();
+ }
+
+ RemoveFrame(nsLayoutUtils::GetChildListNameFor(childFrame), childFrame);
+
+ // NOTE(emilio): aChild could be dead here already if it is a ::before or
+ // ::after pseudo-element (since in that case it was owned by childFrame,
+ // which we just destroyed).
+
+ if (isRoot) {
+ mRootElementFrame = nullptr;
+ mRootElementStyleFrame = nullptr;
+ mDocElementContainingBlock = nullptr;
+ mPageSequenceFrame = nullptr;
+ mHasRootAbsPosContainingBlock = false;
+ }
+
+ if (haveFLS && mRootElementFrame) {
+ RecoverLetterFrames(containingBlock);
+ }
+
+ // If we're just reconstructing frames for the element, then the
+ // following ContentInserted notification on the element will
+ // take care of fixing up any adjacent text nodes. We don't need
+ // to do this if the table parent type of our parent type is not
+ // eTypeBlock, though, because in that case the whitespace isn't
+ // being suppressed due to us anyway.
+ if (aOldNextSibling && aFlags == REMOVE_CONTENT &&
+ GetParentType(parentType) == eTypeBlock) {
+ MOZ_ASSERT(aChild->GetParentNode(),
+ "How did we have a sibling without a parent?");
+ // Adjacent whitespace-only text nodes might have been suppressed if
+ // this node does not have inline ends. Create frames for them now
+ // if necessary.
+ // Reframe any text node just before the node being removed, if there is
+ // one, and if it's not the last child or the first child. If a whitespace
+ // textframe was being suppressed and it's now the last child or first
+ // child then it can stay suppressed since the parent must be a block
+ // and hence it's adjacent to a block end.
+ // If aOldNextSibling is null, then the text node before the node being
+ // removed is the last node, and we don't need to worry about it.
+ //
+ // FIXME(emilio): This should probably use the lazy frame construction
+ // bits if possible instead of reframing it in place.
+ nsIContent* prevSibling = aOldNextSibling->GetPreviousSibling();
+ if (prevSibling && prevSibling->GetPreviousSibling()) {
+ LAYOUT_PHASE_TEMP_EXIT();
+ ReframeTextIfNeeded(prevSibling);
+ LAYOUT_PHASE_TEMP_REENTER();
+ }
+ // Reframe any text node just after the node being removed, if there is
+ // one, and if it's not the last child or the first child.
+ if (aOldNextSibling->GetNextSibling() &&
+ aOldNextSibling->GetPreviousSibling()) {
+ LAYOUT_PHASE_TEMP_EXIT();
+ ReframeTextIfNeeded(aOldNextSibling);
+ LAYOUT_PHASE_TEMP_REENTER();
+ }
+ }
+
+#ifdef DEBUG
+ if (gReallyNoisyContentUpdates && parentFrame) {
+ printf("nsCSSFrameConstructor::ContentRemoved: resulting frame model:\n");
+ parentFrame->List(stdout);
+ }
+#endif
+ }
+
+ return false;
+}
+
+/**
+ * This method invalidates the canvas when frames are removed or added for a
+ * node that might have its background propagated to the canvas, i.e., a
+ * document root node or an HTML BODY which is a child of the root node.
+ *
+ * @param aFrame a frame for a content node about to be removed or a frame that
+ * was just created for a content node that was inserted.
+ */
+static void InvalidateCanvasIfNeeded(PresShell* aPresShell, nsIContent* aNode) {
+ MOZ_ASSERT(aPresShell->GetRootFrame(), "What happened here?");
+ MOZ_ASSERT(aPresShell->GetPresContext(), "Say what?");
+
+ // Note that both in ContentRemoved and ContentInserted the content node
+ // will still have the right parent pointer, so looking at that is ok.
+
+ nsIContent* parent = aNode->GetParent();
+ if (parent) {
+ // Has a parent; might not be what we want
+ nsIContent* grandParent = parent->GetParent();
+ if (grandParent) {
+ // Has a grandparent, so not what we want
+ return;
+ }
+
+ // Check whether it's an HTML body
+ if (!aNode->IsHTMLElement(nsGkAtoms::body)) {
+ return;
+ }
+ }
+
+ // At this point the node has no parent or it's an HTML <body> child of the
+ // root. We might not need to invalidate in this case (eg we might be in
+ // XHTML or something), but chances are we want to. Play it safe.
+ // Invalidate the viewport.
+
+ nsIFrame* rootFrame = aPresShell->GetRootFrame();
+ rootFrame->InvalidateFrameSubtree();
+}
+
+bool nsCSSFrameConstructor::EnsureFrameForTextNodeIsCreatedAfterFlush(
+ CharacterData* aContent) {
+ if (!aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE)) {
+ return false;
+ }
+
+ if (mAlwaysCreateFramesForIgnorableWhitespace) {
+ return false;
+ }
+
+ // Text frame may have been suppressed. Disable suppression and signal that a
+ // flush should be performed. We do this on a document-wide basis so that
+ // pages that repeatedly query metrics for collapsed-whitespace text nodes
+ // don't trigger pathological behavior.
+ mAlwaysCreateFramesForIgnorableWhitespace = true;
+ Element* root = mDocument->GetRootElement();
+ if (!root) {
+ return false;
+ }
+
+ RestyleManager()->PostRestyleEvent(root, RestyleHint{0},
+ nsChangeHint_ReconstructFrame);
+ return true;
+}
+
+void nsCSSFrameConstructor::CharacterDataChanged(
+ nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
+ AUTO_PROFILER_LABEL("nsCSSFrameConstructor::CharacterDataChanged",
+ LAYOUT_FrameConstruction);
+ AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC);
+
+ if ((aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) &&
+ !aContent->TextIsOnlyWhitespace()) ||
+ (aContent->HasFlag(NS_REFRAME_IF_WHITESPACE) &&
+ aContent->TextIsOnlyWhitespace())) {
+#ifdef DEBUG
+ nsIFrame* frame = aContent->GetPrimaryFrame();
+ NS_ASSERTION(!frame || !frame->IsGeneratedContentFrame(),
+ "Bit should never be set on generated content");
+#endif
+ LAYOUT_PHASE_TEMP_EXIT();
+ RecreateFramesForContent(aContent, InsertionKind::Async);
+ LAYOUT_PHASE_TEMP_REENTER();
+ return;
+ }
+
+ // It's possible the frame whose content changed isn't inserted into the
+ // frame hierarchy yet, or that there is no frame that maps the content
+ if (nsIFrame* frame = aContent->GetPrimaryFrame()) {
+#if 0
+ NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
+ ("nsCSSFrameConstructor::CharacterDataChanged: content=%p[%s] subcontent=%p frame=%p",
+ aContent, ContentTag(aContent, 0),
+ aSubContent, frame));
+#endif
+
+ // Special check for text content that is a child of a letter frame. If
+ // this happens, we should remove the letter frame, do whatever we're
+ // planning to do with this notification, then put the letter frame back.
+ // Note that this is basically what RecreateFramesForContent ends up doing;
+ // the reason we dont' want to call that here is that our text content
+ // could be native anonymous, in which case RecreateFramesForContent would
+ // completely barf on it. And recreating the non-anonymous ancestor would
+ // just lead us to come back into this notification (e.g. if quotes or
+ // counters are involved), leading to a loop.
+ nsContainerFrame* block = GetFloatContainingBlock(frame);
+ bool haveFirstLetterStyle = false;
+ if (block) {
+ // See if the block has first-letter style applied to it.
+ haveFirstLetterStyle = HasFirstLetterStyle(block);
+ if (haveFirstLetterStyle) {
+ RemoveLetterFrames(mPresShell, block);
+ // Reget |frame|, since we might have killed it.
+ // Do we really need to call CharacterDataChanged in this case, though?
+ frame = aContent->GetPrimaryFrame();
+ NS_ASSERTION(frame, "Should have frame here!");
+ }
+ }
+
+ // Notify the first frame that maps the content. It will generate a reflow
+ // command
+ frame->CharacterDataChanged(aInfo);
+
+ if (haveFirstLetterStyle) {
+ RecoverLetterFrames(block);
+ }
+ }
+}
+
+void nsCSSFrameConstructor::RecalcQuotesAndCounters() {
+ nsAutoScriptBlocker scriptBlocker;
+
+ if (mQuotesDirty) {
+ mQuotesDirty = false;
+ mQuoteList.RecalcAll();
+ }
+
+ if (mCountersDirty) {
+ mCountersDirty = false;
+ mCounterManager.RecalcAll();
+ }
+
+ NS_ASSERTION(!mQuotesDirty, "Quotes updates will be lost");
+ NS_ASSERTION(!mCountersDirty, "Counter updates will be lost");
+}
+
+void nsCSSFrameConstructor::NotifyCounterStylesAreDirty() {
+ mCounterManager.SetAllDirty();
+ CountersDirty();
+}
+
+void nsCSSFrameConstructor::WillDestroyFrameTree() {
+#if defined(DEBUG_dbaron_off)
+ mCounterManager.Dump();
+#endif
+
+ mIsDestroyingFrameTree = true;
+
+ // Prevent frame tree destruction from being O(N^2)
+ mQuoteList.Clear();
+ mCounterManager.Clear();
+ nsFrameManager::Destroy();
+}
+
+// STATIC
+
+// XXXbz I'd really like this method to go away. Once we have inline-block and
+// I can just use that for sized broken images, that can happen, maybe.
+void nsCSSFrameConstructor::GetAlternateTextFor(Element* aElement, nsAtom* aTag,
+ nsAString& aAltText) {
+ // The "alt" attribute specifies alternate text that is rendered
+ // when the image can not be displayed.
+ if (aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::alt, aAltText)) {
+ return;
+ }
+
+ if (nsGkAtoms::input == aTag) {
+ // If there's no "alt" attribute, and aContent is an input element, then use
+ // the value of the "value" attribute
+ if (aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::value, aAltText)) {
+ return;
+ }
+
+ // If there's no "value" attribute either, then use the localized string for
+ // "Submit" as the alternate text.
+ nsContentUtils::GetMaybeLocalizedString(nsContentUtils::eFORMS_PROPERTIES,
+ "Submit", aElement->OwnerDoc(),
+ aAltText);
+ }
+}
+
+nsIFrame* nsCSSFrameConstructor::CreateContinuingOuterTableFrame(
+ nsIFrame* aFrame, nsContainerFrame* aParentFrame, nsIContent* aContent,
+ ComputedStyle* aComputedStyle) {
+ nsTableWrapperFrame* newFrame =
+ NS_NewTableWrapperFrame(mPresShell, aComputedStyle);
+
+ newFrame->Init(aContent, aParentFrame, aFrame);
+
+ // Create a continuing inner table frame, and if there's a caption then
+ // replicate the caption
+ nsFrameList newChildFrames;
+
+ nsIFrame* childFrame = aFrame->PrincipalChildList().FirstChild();
+ if (childFrame) {
+ nsIFrame* continuingTableFrame =
+ CreateContinuingFrame(childFrame, newFrame);
+ newChildFrames.AppendFrame(nullptr, continuingTableFrame);
+
+ NS_ASSERTION(!childFrame->GetNextSibling(),
+ "there can be only one inner table frame");
+ }
+
+ // Set the table wrapper's initial child list
+ newFrame->SetInitialChildList(kPrincipalList, newChildFrames);
+
+ return newFrame;
+}
+
+nsIFrame* nsCSSFrameConstructor::CreateContinuingTableFrame(
+ nsIFrame* aFrame, nsContainerFrame* aParentFrame, nsIContent* aContent,
+ ComputedStyle* aComputedStyle) {
+ nsTableFrame* newFrame = NS_NewTableFrame(mPresShell, aComputedStyle);
+
+ newFrame->Init(aContent, aParentFrame, aFrame);
+
+ // Replicate any header/footer frames
+ nsFrameList childFrames;
+ for (nsIFrame* childFrame : aFrame->PrincipalChildList()) {
+ // See if it's a header/footer, possibly wrapped in a scroll frame.
+ nsTableRowGroupFrame* rowGroupFrame =
+ static_cast<nsTableRowGroupFrame*>(childFrame);
+ // If the row group was continued, then don't replicate it.
+ nsIFrame* rgNextInFlow = rowGroupFrame->GetNextInFlow();
+ if (rgNextInFlow) {
+ rowGroupFrame->SetRepeatable(false);
+ } else if (rowGroupFrame->IsRepeatable()) {
+ // Replicate the header/footer frame.
+ nsTableRowGroupFrame* headerFooterFrame;
+ nsFrameList childList;
+
+ nsFrameConstructorState state(
+ mPresShell, GetAbsoluteContainingBlock(newFrame, FIXED_POS),
+ GetAbsoluteContainingBlock(newFrame, ABS_POS), nullptr);
+ state.mCreatingExtraFrames = true;
+
+ ComputedStyle* const headerFooterComputedStyle = rowGroupFrame->Style();
+ headerFooterFrame = static_cast<nsTableRowGroupFrame*>(
+ NS_NewTableRowGroupFrame(mPresShell, headerFooterComputedStyle));
+
+ nsIContent* headerFooter = rowGroupFrame->GetContent();
+ headerFooterFrame->Init(headerFooter, newFrame, nullptr);
+
+ nsFrameConstructorSaveState absoluteSaveState;
+ MakeTablePartAbsoluteContainingBlockIfNeeded(
+ state, headerFooterComputedStyle->StyleDisplay(), absoluteSaveState,
+ headerFooterFrame);
+
+ ProcessChildren(state, headerFooter, rowGroupFrame->Style(),
+ headerFooterFrame, true, childList, false, nullptr);
+ NS_ASSERTION(state.mFloatedList.IsEmpty(), "unexpected floated element");
+ headerFooterFrame->SetInitialChildList(kPrincipalList, childList);
+ headerFooterFrame->SetRepeatable(true);
+
+ // Table specific initialization
+ headerFooterFrame->InitRepeatedFrame(rowGroupFrame);
+
+ // XXX Deal with absolute and fixed frames...
+ childFrames.AppendFrame(nullptr, headerFooterFrame);
+ }
+ }
+
+ // Set the table frame's initial child list
+ newFrame->SetInitialChildList(kPrincipalList, childFrames);
+
+ return newFrame;
+}
+
+nsIFrame* nsCSSFrameConstructor::CreateContinuingFrame(
+ nsIFrame* aFrame, nsContainerFrame* aParentFrame, bool aIsFluid) {
+ ComputedStyle* computedStyle = aFrame->Style();
+ nsIFrame* newFrame = nullptr;
+ nsIFrame* nextContinuation = aFrame->GetNextContinuation();
+ nsIFrame* nextInFlow = aFrame->GetNextInFlow();
+
+ // Use the frame type to determine what type of frame to create
+ LayoutFrameType frameType = aFrame->Type();
+ nsIContent* content = aFrame->GetContent();
+
+ if (LayoutFrameType::Text == frameType) {
+ newFrame = NS_NewContinuingTextFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::Inline == frameType) {
+ newFrame = NS_NewInlineFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::Block == frameType) {
+ MOZ_ASSERT(!aFrame->IsTableCaption(),
+ "no support for fragmenting table captions yet");
+ newFrame = NS_NewBlockFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+#ifdef MOZ_XUL
+ } else if (LayoutFrameType::XULLabel == frameType) {
+ newFrame = NS_NewXULLabelFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+#endif
+ } else if (LayoutFrameType::ColumnSetWrapper == frameType) {
+ newFrame =
+ NS_NewColumnSetWrapperFrame(mPresShell, computedStyle, nsFrameState(0));
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::ColumnSet == frameType) {
+ MOZ_ASSERT(!aFrame->IsTableCaption(),
+ "no support for fragmenting table captions yet");
+ newFrame = NS_NewColumnSetFrame(mPresShell, computedStyle, nsFrameState(0));
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::PrintedSheet == frameType) {
+ newFrame = ConstructPrintedSheetFrame(mPresShell, aParentFrame, aFrame);
+ } else if (LayoutFrameType::Page == frameType) {
+ nsContainerFrame* canvasFrame; // (unused outparam for ConstructPageFrame)
+ newFrame =
+ ConstructPageFrame(mPresShell, aParentFrame, aFrame, canvasFrame);
+ } else if (LayoutFrameType::TableWrapper == frameType) {
+ newFrame = CreateContinuingOuterTableFrame(aFrame, aParentFrame, content,
+ computedStyle);
+ } else if (LayoutFrameType::Table == frameType) {
+ newFrame = CreateContinuingTableFrame(aFrame, aParentFrame, content,
+ computedStyle);
+ } else if (LayoutFrameType::TableRowGroup == frameType) {
+ newFrame = NS_NewTableRowGroupFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ if (newFrame->HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) {
+ nsTableFrame::RegisterPositionedTablePart(newFrame);
+ }
+ } else if (LayoutFrameType::TableRow == frameType) {
+ nsTableRowFrame* rowFrame = NS_NewTableRowFrame(mPresShell, computedStyle);
+
+ rowFrame->Init(content, aParentFrame, aFrame);
+ if (rowFrame->HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) {
+ nsTableFrame::RegisterPositionedTablePart(rowFrame);
+ }
+
+ // Create a continuing frame for each table cell frame
+ nsFrameList newChildList;
+ nsIFrame* cellFrame = aFrame->PrincipalChildList().FirstChild();
+ while (cellFrame) {
+ // See if it's a table cell frame
+ if (cellFrame->IsTableCellFrame()) {
+ nsIFrame* continuingCellFrame =
+ CreateContinuingFrame(cellFrame, rowFrame);
+ newChildList.AppendFrame(nullptr, continuingCellFrame);
+ }
+ cellFrame = cellFrame->GetNextSibling();
+ }
+
+ rowFrame->SetInitialChildList(kPrincipalList, newChildList);
+ newFrame = rowFrame;
+
+ } else if (LayoutFrameType::TableCell == frameType) {
+ // Warning: If you change this and add a wrapper frame around table cell
+ // frames, make sure Bug 368554 doesn't regress!
+ // See IsInAutoWidthTableCellForQuirk() in nsImageFrame.cpp.
+ nsTableFrame* tableFrame =
+ static_cast<nsTableRowFrame*>(aParentFrame)->GetTableFrame();
+ nsTableCellFrame* cellFrame =
+ NS_NewTableCellFrame(mPresShell, computedStyle, tableFrame);
+
+ cellFrame->Init(content, aParentFrame, aFrame);
+ if (cellFrame->HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) {
+ nsTableFrame::RegisterPositionedTablePart(cellFrame);
+ }
+
+ // Create a continuing area frame
+ nsIFrame* blockFrame = aFrame->PrincipalChildList().FirstChild();
+ nsIFrame* continuingBlockFrame =
+ CreateContinuingFrame(blockFrame, cellFrame);
+
+ SetInitialSingleChild(cellFrame, continuingBlockFrame);
+ newFrame = cellFrame;
+ } else if (LayoutFrameType::Line == frameType) {
+ newFrame = NS_NewFirstLineFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::Letter == frameType) {
+ newFrame = NS_NewFirstLetterFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::Image == frameType) {
+ auto* imageFrame = static_cast<nsImageFrame*>(aFrame);
+ newFrame = imageFrame->CreateContinuingFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::ImageControl == frameType) {
+ newFrame = NS_NewImageControlFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::FieldSet == frameType) {
+ newFrame = NS_NewFieldSetFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::Legend == frameType) {
+ newFrame = NS_NewLegendFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::FlexContainer == frameType) {
+ newFrame = NS_NewFlexContainerFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::GridContainer == frameType) {
+ newFrame = NS_NewGridContainerFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::Ruby == frameType) {
+ newFrame = NS_NewRubyFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::RubyBaseContainer == frameType) {
+ newFrame = NS_NewRubyBaseContainerFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::RubyTextContainer == frameType) {
+ newFrame = NS_NewRubyTextContainerFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else if (LayoutFrameType::Details == frameType) {
+ newFrame = NS_NewDetailsFrame(mPresShell, computedStyle);
+ newFrame->Init(content, aParentFrame, aFrame);
+ } else {
+ MOZ_CRASH("unexpected frame type");
+ }
+
+ // Init() set newFrame to be a fluid continuation of aFrame.
+ // If we want a non-fluid continuation, we need to call SetPrevContinuation()
+ // to reset NS_FRAME_IS_FLUID_CONTINUATION.
+ if (!aIsFluid) {
+ newFrame->SetPrevContinuation(aFrame);
+ }
+
+ // If a continuing frame needs to carry frame state bits from its previous
+ // continuation or parent, set them in nsIFrame::Init(), or in any derived
+ // frame class's Init() if the bits are belong to specific group.
+
+ if (nextInFlow) {
+ nextInFlow->SetPrevInFlow(newFrame);
+ newFrame->SetNextInFlow(nextInFlow);
+ } else if (nextContinuation) {
+ nextContinuation->SetPrevContinuation(newFrame);
+ newFrame->SetNextContinuation(nextContinuation);
+ }
+
+ // aFrame cannot be a dynamic reflow root because it has a continuation now.
+ aFrame->RemoveStateBits(NS_FRAME_DYNAMIC_REFLOW_ROOT);
+
+ MOZ_ASSERT(!newFrame->GetNextSibling(), "unexpected sibling");
+ return newFrame;
+}
+
+nsresult nsCSSFrameConstructor::ReplicateFixedFrames(
+ nsPageContentFrame* aParentFrame) {
+ // Now deal with fixed-pos things.... They should appear on all pages,
+ // so we want to move over the placeholders when processing the child
+ // of the pageContentFrame.
+
+ nsIFrame* prevPageContentFrame = aParentFrame->GetPrevInFlow();
+ if (!prevPageContentFrame) {
+ return NS_OK;
+ }
+ nsContainerFrame* canvasFrame =
+ do_QueryFrame(aParentFrame->PrincipalChildList().FirstChild());
+ nsIFrame* prevCanvasFrame =
+ prevPageContentFrame->PrincipalChildList().FirstChild();
+ if (!canvasFrame || !prevCanvasFrame) {
+ // document's root element frame missing
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ nsFrameList fixedPlaceholders;
+ nsIFrame* firstFixed =
+ prevPageContentFrame->GetChildList(nsIFrame::kFixedList).FirstChild();
+ if (!firstFixed) {
+ return NS_OK;
+ }
+
+ // Don't allow abs-pos descendants of the fixed content to escape the content.
+ // This should not normally be possible (because fixed-pos elements should
+ // be absolute containers) but fixed-pos tables currently aren't abs-pos
+ // containers.
+ nsFrameConstructorState state(mPresShell, aParentFrame, nullptr,
+ mRootElementFrame);
+ state.mCreatingExtraFrames = true;
+
+ // We can't use an ancestor filter here, because we're not going to
+ // be usefully recurring down the tree. This means that other
+ // places in frame construction can't assume a filter is
+ // initialized!
+
+ // Iterate across fixed frames and replicate each whose placeholder is a
+ // descendant of aFrame. (We don't want to explicitly copy placeholders that
+ // are within fixed frames, because that would cause duplicates on the new
+ // page - bug 389619)
+ for (nsIFrame* fixed = firstFixed; fixed; fixed = fixed->GetNextSibling()) {
+ nsIFrame* prevPlaceholder = fixed->GetPlaceholderFrame();
+ if (prevPlaceholder && nsLayoutUtils::IsProperAncestorFrame(
+ prevCanvasFrame, prevPlaceholder)) {
+ // We want to use the same style as the primary style frame for
+ // our content
+ nsIContent* content = fixed->GetContent();
+ ComputedStyle* computedStyle =
+ nsLayoutUtils::GetStyleFrame(content)->Style();
+ AutoFrameConstructionItemList items(this);
+ AddFrameConstructionItemsInternal(state, content, canvasFrame, true,
+ computedStyle,
+ {ItemFlag::AllowPageBreak}, items);
+ ConstructFramesFromItemList(state, items, canvasFrame,
+ /* aParentIsWrapperAnonBox = */ false,
+ fixedPlaceholders);
+ }
+ }
+
+ // Add the placeholders to our primary child list.
+ // XXXbz this is a little screwed up, since the fixed frames will have
+ // broken auto-positioning. Oh, well.
+ NS_ASSERTION(!canvasFrame->PrincipalChildList().FirstChild(),
+ "leaking frames; doc root continuation must be empty");
+ canvasFrame->SetInitialChildList(kPrincipalList, fixedPlaceholders);
+ return NS_OK;
+}
+
+nsCSSFrameConstructor::InsertionPoint nsCSSFrameConstructor::GetInsertionPoint(
+ nsIContent* aChild) {
+ MOZ_ASSERT(aChild);
+ nsIContent* insertionElement = aChild->GetFlattenedTreeParent();
+ if (!insertionElement) {
+ // The element doesn't belong in the flattened tree, and thus we don't want
+ // to render it.
+ return {};
+ }
+
+ return {GetContentInsertionFrameFor(insertionElement), insertionElement};
+}
+
+// Capture state for the frame tree rooted at the frame associated with the
+// content object, aContent
+void nsCSSFrameConstructor::CaptureStateForFramesOf(
+ nsIContent* aContent, nsILayoutHistoryState* aHistoryState) {
+ if (!aHistoryState) {
+ return;
+ }
+ nsIFrame* frame = aContent->GetPrimaryFrame();
+ if (frame == mRootElementFrame) {
+ frame = mRootElementFrame
+ ? GetAbsoluteContainingBlock(mRootElementFrame, FIXED_POS)
+ : GetRootFrame();
+ }
+ for (; frame;
+ frame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(frame)) {
+ CaptureFrameState(frame, aHistoryState);
+ }
+}
+
+static bool IsWhitespaceFrame(nsIFrame* aFrame) {
+ MOZ_ASSERT(aFrame, "invalid argument");
+ return aFrame->IsTextFrame() && aFrame->GetContent()->TextIsOnlyWhitespace();
+}
+
+static nsIFrame* FindFirstNonWhitespaceChild(nsIFrame* aParentFrame) {
+ nsIFrame* f = aParentFrame->PrincipalChildList().FirstChild();
+ while (f && IsWhitespaceFrame(f)) {
+ f = f->GetNextSibling();
+ }
+ return f;
+}
+
+static nsIFrame* FindNextNonWhitespaceSibling(nsIFrame* aFrame) {
+ nsIFrame* f = aFrame;
+ do {
+ f = f->GetNextSibling();
+ } while (f && IsWhitespaceFrame(f));
+ return f;
+}
+
+static nsIFrame* FindPreviousNonWhitespaceSibling(nsIFrame* aFrame) {
+ nsIFrame* f = aFrame;
+ do {
+ f = f->GetPrevSibling();
+ } while (f && IsWhitespaceFrame(f));
+ return f;
+}
+
+bool nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval(
+ nsIFrame* aFrame) {
+#define TRACE(reason) \
+ PROFILER_MARKER("MaybeRecreateContainerForFrameRemoval: " reason, LAYOUT, \
+ {}, Tracing, "Layout")
+ MOZ_ASSERT(aFrame, "Must have a frame");
+ MOZ_ASSERT(aFrame->GetParent(), "Frame shouldn't be root");
+ MOZ_ASSERT(aFrame == aFrame->FirstContinuation(),
+ "aFrame not the result of GetPrimaryFrame()?");
+
+ nsIFrame* inFlowFrame = aFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)
+ ? aFrame->GetPlaceholderFrame()
+ : aFrame;
+ MOZ_ASSERT(inFlowFrame, "How did that happen?");
+ MOZ_ASSERT(inFlowFrame == inFlowFrame->FirstContinuation(),
+ "placeholder for primary frame has previous continuations?");
+ nsIFrame* parent = inFlowFrame->GetParent();
+
+ if (inFlowFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) {
+ nsIFrame* grandparent = parent->GetParent();
+ MOZ_ASSERT(grandparent);
+
+ bool needsReframe =
+ // 1. Removing a column-span may lead to an empty
+ // ::-moz-column-span-wrapper.
+ inFlowFrame->IsColumnSpan() ||
+ // 2. Removing a frame which has any column-span siblings may also
+ // lead to an empty ::-moz-column-span-wrapper subtree. The
+ // column-span siblings were the frame's children, but later become
+ // the frame's siblings after CreateColumnSpanSiblings().
+ inFlowFrame->HasColumnSpanSiblings() ||
+ // 3. Removing the only child of a ::-moz-column-content, whose
+ // ColumnSet grandparent has a previous column-span sibling, requires
+ // reframing since we might connect the ColumnSet's next column-span
+ // sibling (if there's one). Note that this isn't actually needed if
+ // the ColumnSet is at the end of ColumnSetWrapper since we create
+ // empty ones at the end anyway, but we're not worried about
+ // optimizing that case.
+ (parent->Style()->GetPseudoType() == PseudoStyleType::columnContent &&
+ // The only child in ::-moz-column-content (might be tall enough to
+ // split across columns)
+ !inFlowFrame->GetPrevSibling() && !inFlowFrame->GetNextSibling() &&
+ // That ::-moz-column-content is the first column.
+ !parent->GetPrevInFlow() &&
+ // The ColumnSet grandparent has a previous sibling that is a
+ // column-span.
+ grandparent->GetPrevSibling());
+
+ if (needsReframe) {
+ nsContainerFrame* containingBlock =
+ GetMultiColumnContainingBlockFor(inFlowFrame);
+
+#ifdef DEBUG
+ if (IsFramePartOfIBSplit(inFlowFrame)) {
+ nsIFrame* ibContainingBlock = GetIBContainingBlockFor(inFlowFrame);
+ MOZ_ASSERT(containingBlock == ibContainingBlock ||
+ nsLayoutUtils::IsProperAncestorFrame(containingBlock,
+ ibContainingBlock),
+ "Multi-column containing block should be equal to or be the "
+ "ancestor of the IB containing block!");
+ }
+#endif
+
+ TRACE("Multi-column");
+ RecreateFramesForContent(containingBlock->GetContent(),
+ InsertionKind::Async);
+ return true;
+ }
+ }
+
+ if (IsFramePartOfIBSplit(aFrame)) {
+ // The removal functions can't handle removal of an {ib} split directly; we
+ // need to rebuild the containing block.
+ TRACE("IB split removal");
+ ReframeContainingBlock(aFrame);
+ return true;
+ }
+
+ nsContainerFrame* insertionFrame = aFrame->GetContentInsertionFrame();
+ if (insertionFrame && insertionFrame->IsLegendFrame() &&
+ aFrame->GetParent()->IsFieldSetFrame()) {
+ TRACE("Fieldset / Legend");
+ RecreateFramesForContent(aFrame->GetParent()->GetContent(),
+ InsertionKind::Async);
+ return true;
+ }
+
+ if (parent && parent->IsDetailsFrame()) {
+ HTMLSummaryElement* summary =
+ HTMLSummaryElement::FromNode(aFrame->GetContent());
+ DetailsFrame* detailsFrame = static_cast<DetailsFrame*>(parent);
+
+ // Unlike adding summary element cases, we need to check children of the
+ // parent details frame since at this moment the summary element has been
+ // already removed from the parent details element's child list.
+ if (summary && detailsFrame->HasMainSummaryFrame(aFrame)) {
+ // When removing a summary, we should reframe the parent details frame to
+ // ensure that another summary is used or the default summary is
+ // generated.
+ TRACE("Details / Summary");
+ RecreateFramesForContent(parent->GetContent(), InsertionKind::Async);
+ return true;
+ }
+ }
+
+ // Now check for possibly needing to reconstruct due to a pseudo parent
+ // For the case of ruby pseudo parent, effectively, only pseudo rb/rt frame
+ // need to be checked here, since all other types of parent will be catched
+ // by "Check ruby containers" section below.
+ if (IsTableOrRubyPseudo(parent)) {
+ if (FindFirstNonWhitespaceChild(parent) == inFlowFrame ||
+ !FindNextNonWhitespaceSibling(inFlowFrame->LastContinuation()) ||
+ // If it is a whitespace, and is the only child of the parent, the
+ // pseudo parent was created for the space, and should now be removed.
+ (IsWhitespaceFrame(aFrame) &&
+ parent->PrincipalChildList().OnlyChild()) ||
+ // If we're a table-column-group, then the OnlyChild check above is
+ // not going to catch cases when we're the first child.
+ (inFlowFrame->IsTableColGroupFrame() &&
+ parent->GetChildList(nsIFrame::kColGroupList).FirstChild() ==
+ inFlowFrame) ||
+ // Similar if we're a table-caption.
+ (inFlowFrame->IsTableCaption() &&
+ parent->GetChildList(nsIFrame::kCaptionList).FirstChild() ==
+ inFlowFrame)) {
+ TRACE("Table or ruby pseudo parent");
+ RecreateFramesForContent(parent->GetContent(), InsertionKind::Async);
+ return true;
+ }
+ }
+
+ // Might need to reconstruct things if this frame's nextSibling is a table
+ // or ruby pseudo, since removal of this frame might mean that this pseudo
+ // needs to get merged with the frame's prevSibling if that's also a table
+ // or ruby pseudo.
+ nsIFrame* nextSibling =
+ FindNextNonWhitespaceSibling(inFlowFrame->LastContinuation());
+ NS_ASSERTION(!IsTableOrRubyPseudo(inFlowFrame), "Shouldn't happen here");
+ // Effectively, for the ruby pseudo sibling case, only pseudo <ruby> frame
+ // need to be checked here, since all other types of such frames will have
+ // a ruby container parent, and be catched by "Check ruby containers" below.
+ if (nextSibling && IsTableOrRubyPseudo(nextSibling)) {
+ nsIFrame* prevSibling = FindPreviousNonWhitespaceSibling(inFlowFrame);
+ if (prevSibling && IsTableOrRubyPseudo(prevSibling)) {
+ TRACE("Table or ruby pseudo sibling");
+ // Good enough to recreate frames for aFrame's parent's content; even if
+ // aFrame's parent is a pseudo, that'll be the right content node.
+ RecreateFramesForContent(parent->GetContent(), InsertionKind::Async);
+ return true;
+ }
+ }
+
+ // Check ruby containers
+ LayoutFrameType parentType = parent->Type();
+ if (parentType == LayoutFrameType::Ruby ||
+ RubyUtils::IsRubyContainerBox(parentType)) {
+ // In ruby containers, pseudo frames may be created from
+ // whitespaces or even nothing. There are two cases we actually
+ // need to handle here, but hard to check exactly:
+ // 1. Status of spaces beside the frame may vary, and related
+ // frames may be constructed or destroyed accordingly.
+ // 2. The type of the first child of a ruby frame determines
+ // whether a pseudo ruby base container should exist.
+ TRACE("Ruby container");
+ RecreateFramesForContent(parent->GetContent(), InsertionKind::Async);
+ return true;
+ }
+
+ // Might need to reconstruct things if the removed frame's nextSibling is an
+ // anonymous flex item. The removed frame might've been what divided two
+ // runs of inline content into two anonymous flex items, which would now
+ // need to be merged.
+ // NOTE: It's fine that we've advanced nextSibling past whitespace (up above);
+ // we're only interested in anonymous flex items here, and those can never
+ // be adjacent to whitespace, since they absorb contiguous runs of inline
+ // non-replaced content (including whitespace).
+ if (nextSibling && IsAnonymousFlexOrGridItem(nextSibling)) {
+ AssertAnonymousFlexOrGridItemParent(nextSibling, parent);
+ TRACE("Anon flex or grid item next sibling");
+ // Recreate frames for the flex container (the removed frame's parent)
+ RecreateFramesForContent(parent->GetContent(), InsertionKind::Async);
+ return true;
+ }
+
+ // Might need to reconstruct things if the removed frame's nextSibling is
+ // null and its parent is an anonymous flex item. (This might be the last
+ // remaining child of that anonymous flex item, which can then go away.)
+ if (!nextSibling && IsAnonymousFlexOrGridItem(parent)) {
+ AssertAnonymousFlexOrGridItemParent(parent, parent->GetParent());
+ TRACE("Anon flex or grid item parent");
+ // Recreate frames for the flex container (the removed frame's grandparent)
+ RecreateFramesForContent(parent->GetParent()->GetContent(),
+ InsertionKind::Async);
+ return true;
+ }
+
+#ifdef MOZ_XUL
+ if (aFrame->IsPopupSetFrame()) {
+ nsIPopupContainer* popupContainer =
+ nsIPopupContainer::GetPopupContainer(mPresShell);
+ if (popupContainer && popupContainer->GetPopupSetFrame() == aFrame) {
+ TRACE("PopupSet");
+ ReconstructDocElementHierarchy(InsertionKind::Async);
+ return true;
+ }
+ }
+#endif
+
+ // Reconstruct if inflowFrame is parent's only child, and parent is, or has,
+ // a non-fluid continuation, i.e. it was split by bidi resolution
+ if (!inFlowFrame->GetPrevSibling() && !inFlowFrame->GetNextSibling() &&
+ ((parent->GetPrevContinuation() && !parent->GetPrevInFlow()) ||
+ (parent->GetNextContinuation() && !parent->GetNextInFlow()))) {
+ TRACE("Removing last child of non-fluid split parent");
+ RecreateFramesForContent(parent->GetContent(), InsertionKind::Async);
+ return true;
+ }
+
+ // We might still need to reconstruct things if the parent of inFlowFrame is
+ // ib-split, since in that case the removal of aFrame might affect the
+ // splitting of its parent.
+ if (!IsFramePartOfIBSplit(parent)) {
+ return false;
+ }
+
+ // If inFlowFrame is not the only in-flow child of |parent|, then removing
+ // it will change nothing about the {ib} split.
+ if (inFlowFrame != parent->PrincipalChildList().FirstChild() ||
+ inFlowFrame->LastContinuation()->GetNextSibling()) {
+ return false;
+ }
+
+ // If the parent is the first or last part of the {ib} split, then
+ // removing one of its kids will have no effect on the splitting.
+ // Get the first continuation up front so we don't have to do it twice.
+ nsIFrame* parentFirstContinuation = parent->FirstContinuation();
+ if (!GetIBSplitSibling(parentFirstContinuation) ||
+ !GetIBSplitPrevSibling(parentFirstContinuation)) {
+ return false;
+ }
+
+ TRACE("IB split parent");
+ ReframeContainingBlock(parent);
+ return true;
+#undef TRACE
+}
+
+void nsCSSFrameConstructor::UpdateTableCellSpans(nsIContent* aContent) {
+ nsTableCellFrame* cellFrame = do_QueryFrame(aContent->GetPrimaryFrame());
+
+ // It's possible that this warning could fire if some other style change
+ // simultaneously changes the 'display' of the element and makes it no
+ // longer be a table cell.
+ NS_WARNING_ASSERTION(cellFrame, "Hint should only be posted on table cells!");
+
+ if (cellFrame) {
+ cellFrame->GetTableFrame()->RowOrColSpanChanged(cellFrame);
+ }
+}
+
+static nsIContent* GetTopmostMathMLElement(nsIContent* aMathMLContent) {
+ MOZ_ASSERT(aMathMLContent->IsMathMLElement());
+ MOZ_ASSERT(aMathMLContent->GetPrimaryFrame());
+ MOZ_ASSERT(
+ aMathMLContent->GetPrimaryFrame()->IsFrameOfType(nsIFrame::eMathML));
+ nsIContent* root = aMathMLContent;
+
+ for (nsIContent* parent = aMathMLContent->GetFlattenedTreeParent(); parent;
+ parent = parent->GetFlattenedTreeParent()) {
+ nsIFrame* frame = parent->GetPrimaryFrame();
+ if (!frame || !frame->IsFrameOfType(nsIFrame::eMathML)) {
+ break;
+ }
+ root = parent;
+ }
+
+ return root;
+}
+
+void nsCSSFrameConstructor::RecreateFramesForContent(
+ nsIContent* aContent, InsertionKind aInsertionKind) {
+ MOZ_ASSERT(aContent);
+
+ // If there is no document, we don't want to recreate frames for it. (You
+ // shouldn't generally be giving this method content without a document
+ // anyway).
+ // Rebuilding the frame tree can have bad effects, especially if it's the
+ // frame tree for chrome (see bug 157322).
+ if (NS_WARN_IF(!aContent->GetComposedDoc())) {
+ return;
+ }
+
+ // We don't know how to re-insert an anonymous subtree root, so recreate the
+ // closest non-generated ancestor instead... Except for editor NAC, which
+ // would enter an infinite loop, and we sorta get away with it because it's
+ // all abspos.
+ //
+ // TODO(emilio): We technically can find the right insertion point nowadays
+ // using StyleChildrenIterator rather than FlattenedTreeIterator. But we'd
+ // need to tweak the setup to insert into replaced elements to filter which
+ // anonymous roots can be allowed, and which can't.
+ if (aContent->IsRootOfNativeAnonymousSubtree() &&
+ !ManualNACPtr::IsManualNAC(aContent)) {
+ do {
+ aContent = aContent->GetParent();
+ } while (aContent->IsRootOfNativeAnonymousSubtree());
+ return RecreateFramesForContent(aContent, InsertionKind::Async);
+ }
+
+ nsIFrame* frame = aContent->GetPrimaryFrame();
+ if (frame && frame->IsFrameOfType(nsIFrame::eMathML)) {
+ // Reframe the topmost MathML element to prevent exponential blowup
+ // (see bug 397518).
+ aContent = GetTopmostMathMLElement(aContent);
+ frame = aContent->GetPrimaryFrame();
+ }
+
+ if (frame) {
+ nsIFrame* parent = frame->GetParent();
+ nsIContent* parentContent = parent ? parent->GetContent() : nullptr;
+ // If the parent frame is a leaf then the subsequent insert will fail to
+ // create a frame, so we need to recreate the parent content. This happens
+ // with native anonymous content from the editor.
+ if (parent && parent->IsLeaf() && parentContent &&
+ parentContent != aContent) {
+ return RecreateFramesForContent(parentContent, InsertionKind::Async);
+ }
+ }
+
+ if (frame && MaybeRecreateContainerForFrameRemoval(frame)) {
+ return;
+ }
+
+ MOZ_ASSERT(aContent->GetParentNode());
+
+ // Remove the frames associated with the content object.
+ nsIContent* nextSibling = aContent->IsRootOfNativeAnonymousSubtree()
+ ? nullptr
+ : aContent->GetNextSibling();
+ bool didReconstruct =
+ ContentRemoved(aContent, nextSibling, REMOVE_FOR_RECONSTRUCTION);
+
+ if (!didReconstruct) {
+ if (aInsertionKind == InsertionKind::Async && aContent->IsElement()) {
+ // FIXME(emilio, bug 1397239): There's nothing removing the frame state
+ // for elements that go away before we come back to the frame
+ // constructor.
+ //
+ // Also, it'd be nice to just use the `ContentRangeInserted` path for
+ // both elements and non-elements, but we need to make lazy frame
+ // construction to apply to all elements first.
+ RestyleManager()->PostRestyleEvent(aContent->AsElement(), RestyleHint{0},
+ nsChangeHint_ReconstructFrame);
+ } else {
+ // Now, recreate the frames associated with this content object. If
+ // ContentRemoved triggered reconstruction, then we don't need to do this
+ // because the frames will already have been built.
+ ContentRangeInserted(aContent, aContent->GetNextSibling(),
+ aInsertionKind);
+ }
+ }
+}
+
+bool nsCSSFrameConstructor::DestroyFramesFor(Element* aElement) {
+ MOZ_ASSERT(aElement && aElement->GetParentNode());
+
+ nsIContent* nextSibling = aElement->IsRootOfNativeAnonymousSubtree()
+ ? nullptr
+ : aElement->GetNextSibling();
+
+ return ContentRemoved(aElement, nextSibling, REMOVE_FOR_RECONSTRUCTION);
+}
+
+//////////////////////////////////////////////////////////////////////
+
+// Block frame construction code
+
+already_AddRefed<ComputedStyle> nsCSSFrameConstructor::GetFirstLetterStyle(
+ nsIContent* aContent, ComputedStyle* aComputedStyle) {
+ if (aContent) {
+ return mPresShell->StyleSet()->ResolvePseudoElementStyle(
+ *aContent->AsElement(), PseudoStyleType::firstLetter, aComputedStyle);
+ }
+ return nullptr;
+}
+
+already_AddRefed<ComputedStyle> nsCSSFrameConstructor::GetFirstLineStyle(
+ nsIContent* aContent, ComputedStyle* aComputedStyle) {
+ if (aContent) {
+ return mPresShell->StyleSet()->ResolvePseudoElementStyle(
+ *aContent->AsElement(), PseudoStyleType::firstLine, aComputedStyle);
+ }
+ return nullptr;
+}
+
+// Predicate to see if a given content (block element) has
+// first-letter style applied to it.
+bool nsCSSFrameConstructor::ShouldHaveFirstLetterStyle(
+ nsIContent* aContent, ComputedStyle* aComputedStyle) {
+ return nsLayoutUtils::HasPseudoStyle(aContent, aComputedStyle,
+ PseudoStyleType::firstLetter,
+ mPresShell->GetPresContext());
+}
+
+bool nsCSSFrameConstructor::HasFirstLetterStyle(nsIFrame* aBlockFrame) {
+ MOZ_ASSERT(aBlockFrame, "Need a frame");
+ NS_ASSERTION(aBlockFrame->IsBlockFrameOrSubclass(), "Not a block frame?");
+
+ return aBlockFrame->HasAnyStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE);
+}
+
+bool nsCSSFrameConstructor::ShouldHaveFirstLineStyle(
+ nsIContent* aContent, ComputedStyle* aComputedStyle) {
+ bool hasFirstLine = nsLayoutUtils::HasPseudoStyle(
+ aContent, aComputedStyle, PseudoStyleType::firstLine,
+ mPresShell->GetPresContext());
+ return hasFirstLine && !aContent->IsHTMLElement(nsGkAtoms::fieldset);
+}
+
+void nsCSSFrameConstructor::ShouldHaveSpecialBlockStyle(
+ nsIContent* aContent, ComputedStyle* aComputedStyle,
+ bool* aHaveFirstLetterStyle, bool* aHaveFirstLineStyle) {
+ *aHaveFirstLetterStyle = ShouldHaveFirstLetterStyle(aContent, aComputedStyle);
+ *aHaveFirstLineStyle = ShouldHaveFirstLineStyle(aContent, aComputedStyle);
+}
+
+/* static */
+const nsCSSFrameConstructor::PseudoParentData
+ nsCSSFrameConstructor::sPseudoParentData[eParentTypeCount] = {
+ // Cell
+ {FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET |
+ FCDATA_USE_CHILD_ITEMS |
+ FCDATA_IS_WRAPPER_ANON_BOX |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRow),
+ &nsCSSFrameConstructor::ConstructTableCell),
+ PseudoStyleType::tableCell},
+ // Row
+ {FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET |
+ FCDATA_USE_CHILD_ITEMS |
+ FCDATA_IS_WRAPPER_ANON_BOX |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRowGroup),
+ &nsCSSFrameConstructor::ConstructTableRowOrRowGroup),
+ PseudoStyleType::tableRow},
+ // Row group
+ {FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET |
+ FCDATA_USE_CHILD_ITEMS |
+ FCDATA_IS_WRAPPER_ANON_BOX |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
+ &nsCSSFrameConstructor::ConstructTableRowOrRowGroup),
+ PseudoStyleType::tableRowGroup},
+ // Column group
+ {FCDATA_DECL(
+ FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET |
+ FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_USE_CHILD_ITEMS |
+ FCDATA_SKIP_ABSPOS_PUSH |
+ // Not FCDATA_IS_WRAPPER_ANON_BOX, because we don't need to
+ // restyle these: they have non-inheriting styles.
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable),
+ NS_NewTableColGroupFrame),
+ PseudoStyleType::tableColGroup},
+ // Table
+ {FULL_CTOR_FCDATA(FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS |
+ FCDATA_IS_WRAPPER_ANON_BOX,
+ &nsCSSFrameConstructor::ConstructTable),
+ PseudoStyleType::table},
+ // Ruby
+ {FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT | FCDATA_USE_CHILD_ITEMS |
+ FCDATA_IS_WRAPPER_ANON_BOX | FCDATA_SKIP_FRAMESET,
+ NS_NewRubyFrame),
+ PseudoStyleType::ruby},
+ // Ruby Base
+ {FCDATA_DECL(
+ FCDATA_USE_CHILD_ITEMS | FCDATA_IS_LINE_PARTICIPANT |
+ FCDATA_IS_WRAPPER_ANON_BOX |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRubyBaseContainer) |
+ FCDATA_SKIP_FRAMESET,
+ NS_NewRubyBaseFrame),
+ PseudoStyleType::rubyBase},
+ // Ruby Base Container
+ {FCDATA_DECL(FCDATA_USE_CHILD_ITEMS | FCDATA_IS_LINE_PARTICIPANT |
+ FCDATA_IS_WRAPPER_ANON_BOX |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRuby) |
+ FCDATA_SKIP_FRAMESET,
+ NS_NewRubyBaseContainerFrame),
+ PseudoStyleType::rubyBaseContainer},
+ // Ruby Text
+ {FCDATA_DECL(
+ FCDATA_USE_CHILD_ITEMS | FCDATA_IS_LINE_PARTICIPANT |
+ FCDATA_IS_WRAPPER_ANON_BOX |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRubyTextContainer) |
+ FCDATA_SKIP_FRAMESET,
+ NS_NewRubyTextFrame),
+ PseudoStyleType::rubyText},
+ // Ruby Text Container
+ {FCDATA_DECL(FCDATA_USE_CHILD_ITEMS | FCDATA_IS_WRAPPER_ANON_BOX |
+ FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRuby) |
+ FCDATA_SKIP_FRAMESET,
+ NS_NewRubyTextContainerFrame),
+ PseudoStyleType::rubyTextContainer}};
+
+void nsCSSFrameConstructor::CreateNeededAnonFlexOrGridItems(
+ nsFrameConstructorState& aState, FrameConstructionItemList& aItems,
+ nsIFrame* aParentFrame) {
+ if (aItems.IsEmpty() || !aParentFrame->IsFlexOrGridContainer()) {
+ return;
+ }
+
+ const bool isLegacyBox = IsFlexContainerForLegacyBox(aParentFrame);
+ FCItemIterator iter(aItems);
+ do {
+ // Advance iter past children that don't want to be wrapped
+ if (iter.SkipItemsThatDontNeedAnonFlexOrGridItem(aState, isLegacyBox)) {
+ // Hit the end of the items without finding any remaining children that
+ // need to be wrapped. We're finished!
+ return;
+ }
+
+ // If our next potentially-wrappable child is whitespace, then see if
+ // there's anything wrappable immediately after it. If not, we just drop
+ // the whitespace and move on. (We're not supposed to create any anonymous
+ // flex/grid items that _only_ contain whitespace).
+ // (BUT if this is generated content, then we don't give whitespace nodes
+ // any special treatment, because they're probably not really whitespace --
+ // they're just temporarily empty, waiting for their generated text.)
+ // XXXdholbert If this node's generated text will *actually end up being
+ // entirely whitespace*, then we technically should still skip over it, per
+ // the CSS grid & flexbox specs. I'm not bothering with that at this point,
+ // since it's a pretty extreme edge case.
+ if (!aParentFrame->IsGeneratedContentFrame() &&
+ iter.item().IsWhitespace(aState)) {
+ FCItemIterator afterWhitespaceIter(iter);
+ bool hitEnd = afterWhitespaceIter.SkipWhitespace(aState);
+ bool nextChildNeedsAnonItem =
+ !hitEnd && afterWhitespaceIter.item().NeedsAnonFlexOrGridItem(
+ aState, isLegacyBox);
+
+ if (!nextChildNeedsAnonItem) {
+ // There's nothing after the whitespace that we need to wrap, so we
+ // just drop this run of whitespace.
+ iter.DeleteItemsTo(this, afterWhitespaceIter);
+ if (hitEnd) {
+ // Nothing left to do -- we're finished!
+ return;
+ }
+ // else, we have a next child and it does not want to be wrapped. So,
+ // we jump back to the beginning of the loop to skip over that child
+ // (and anything else non-wrappable after it)
+ MOZ_ASSERT(!iter.IsDone() && !iter.item().NeedsAnonFlexOrGridItem(
+ aState, isLegacyBox),
+ "hitEnd and/or nextChildNeedsAnonItem lied");
+ continue;
+ }
+ }
+
+ // Now |iter| points to the first child that needs to be wrapped in an
+ // anonymous flex/grid item. Now we see how many children after it also want
+ // to be wrapped in an anonymous flex/grid item.
+ FCItemIterator endIter(iter); // iterator to find the end of the group
+ endIter.SkipItemsThatNeedAnonFlexOrGridItem(aState, isLegacyBox);
+
+ NS_ASSERTION(iter != endIter,
+ "Should've had at least one wrappable child to seek past");
+
+ // Now, we create the anonymous flex or grid item to contain the children
+ // between |iter| and |endIter|.
+ auto pseudoType = aParentFrame->IsFlexContainerFrame()
+ ? PseudoStyleType::anonymousFlexItem
+ : PseudoStyleType::anonymousGridItem;
+ ComputedStyle* parentStyle = aParentFrame->Style();
+ nsIContent* parentContent = aParentFrame->GetContent();
+ RefPtr<ComputedStyle> wrapperStyle =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(pseudoType,
+ parentStyle);
+
+ static const FrameConstructionData sBlockFormattingContextFCData =
+ FCDATA_DECL(FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS |
+ FCDATA_IS_WRAPPER_ANON_BOX,
+ NS_NewBlockFormattingContext);
+
+ FrameConstructionItem* newItem = new (this)
+ FrameConstructionItem(&sBlockFormattingContextFCData,
+ // Use the content of our parent frame
+ parentContent, wrapperStyle.forget(), true);
+
+ newItem->mIsAllInline =
+ newItem->mComputedStyle->StyleDisplay()->IsInlineOutsideStyle();
+ newItem->mIsBlock = !newItem->mIsAllInline;
+
+ MOZ_ASSERT(!newItem->mIsAllInline && newItem->mIsBlock,
+ "expecting anonymous flex/grid items to be block-level "
+ "(this will make a difference when we encounter "
+ "'align-items: baseline')");
+
+ // Anonymous flex and grid items induce line boundaries around their
+ // contents.
+ newItem->mChildItems.SetLineBoundaryAtStart(true);
+ newItem->mChildItems.SetLineBoundaryAtEnd(true);
+ // The parent of the items in aItems is also the parent of the items
+ // in mChildItems
+ newItem->mChildItems.SetParentHasNoShadowDOM(aItems.ParentHasNoShadowDOM());
+
+ // Eat up all items between |iter| and |endIter| and put them in our
+ // wrapper. This advances |iter| to point to |endIter|.
+ iter.AppendItemsToList(this, endIter, newItem->mChildItems);
+
+ iter.InsertItem(newItem);
+ } while (!iter.IsDone());
+}
+
+/* static */ nsCSSFrameConstructor::RubyWhitespaceType
+nsCSSFrameConstructor::ComputeRubyWhitespaceType(StyleDisplay aPrevDisplay,
+ StyleDisplay aNextDisplay) {
+ MOZ_ASSERT(nsStyleDisplay::IsRubyDisplayType(aPrevDisplay) &&
+ nsStyleDisplay::IsRubyDisplayType(aNextDisplay));
+ if (aPrevDisplay == aNextDisplay &&
+ (aPrevDisplay == StyleDisplay::RubyBase ||
+ aPrevDisplay == StyleDisplay::RubyText)) {
+ return eRubyInterLeafWhitespace;
+ }
+ if (aNextDisplay == StyleDisplay::RubyText ||
+ aNextDisplay == StyleDisplay::RubyTextContainer) {
+ return eRubyInterLevelWhitespace;
+ }
+ return eRubyInterSegmentWhitespace;
+}
+
+/**
+ * This function checks the content from |aStartIter| to |aEndIter|,
+ * determines whether it contains only whitespace, and if yes,
+ * interprets the type of whitespace. This method does not change
+ * any of the iters.
+ */
+/* static */ nsCSSFrameConstructor::RubyWhitespaceType
+nsCSSFrameConstructor::InterpretRubyWhitespace(nsFrameConstructorState& aState,
+ const FCItemIterator& aStartIter,
+ const FCItemIterator& aEndIter) {
+ if (!aStartIter.item().IsWhitespace(aState)) {
+ return eRubyNotWhitespace;
+ }
+
+ FCItemIterator spaceEndIter(aStartIter);
+ spaceEndIter.SkipWhitespace(aState);
+ if (spaceEndIter != aEndIter) {
+ return eRubyNotWhitespace;
+ }
+
+ // Any leading or trailing whitespace in non-pseudo ruby box
+ // should have been trimmed, hence there should not be any
+ // whitespace at the start or the end.
+ MOZ_ASSERT(!aStartIter.AtStart() && !aEndIter.IsDone());
+ FCItemIterator prevIter(aStartIter);
+ prevIter.Prev();
+ return ComputeRubyWhitespaceType(
+ prevIter.item().mComputedStyle->StyleDisplay()->mDisplay,
+ aEndIter.item().mComputedStyle->StyleDisplay()->mDisplay);
+}
+
+/**
+ * This function eats up consecutive items which do not want the current
+ * parent into either a ruby base box or a ruby text box. When it
+ * returns, |aIter| points to the first item it doesn't wrap.
+ */
+void nsCSSFrameConstructor::WrapItemsInPseudoRubyLeafBox(
+ FCItemIterator& aIter, ComputedStyle* aParentStyle,
+ nsIContent* aParentContent) {
+ StyleDisplay parentDisplay = aParentStyle->StyleDisplay()->mDisplay;
+ ParentType parentType, wrapperType;
+ if (parentDisplay == StyleDisplay::RubyTextContainer) {
+ parentType = eTypeRubyTextContainer;
+ wrapperType = eTypeRubyText;
+ } else {
+ MOZ_ASSERT(parentDisplay == StyleDisplay::RubyBaseContainer);
+ parentType = eTypeRubyBaseContainer;
+ wrapperType = eTypeRubyBase;
+ }
+
+ MOZ_ASSERT(aIter.item().DesiredParentType() != parentType,
+ "Should point to something needs to be wrapped.");
+
+ FCItemIterator endIter(aIter);
+ endIter.SkipItemsNotWantingParentType(parentType);
+
+ WrapItemsInPseudoParent(aParentContent, aParentStyle, wrapperType, aIter,
+ endIter);
+}
+
+/**
+ * This function eats up consecutive items into a ruby level container.
+ * It may create zero or one level container. When it returns, |aIter|
+ * points to the first item it doesn't wrap.
+ */
+void nsCSSFrameConstructor::WrapItemsInPseudoRubyLevelContainer(
+ nsFrameConstructorState& aState, FCItemIterator& aIter,
+ ComputedStyle* aParentStyle, nsIContent* aParentContent) {
+ MOZ_ASSERT(aIter.item().DesiredParentType() != eTypeRuby,
+ "Pointing to a level container?");
+
+ FrameConstructionItem& firstItem = aIter.item();
+ ParentType wrapperType = firstItem.DesiredParentType();
+ if (wrapperType != eTypeRubyTextContainer) {
+ // If the first item is not ruby text,
+ // it should be in a base container.
+ wrapperType = eTypeRubyBaseContainer;
+ }
+
+ FCItemIterator endIter(aIter);
+ do {
+ if (endIter.SkipItemsWantingParentType(wrapperType) ||
+ // If the skipping above stops at some item which wants a
+ // different ruby parent, then we have finished.
+ IsRubyParentType(endIter.item().DesiredParentType())) {
+ // No more items need to be wrapped in this level container.
+ break;
+ }
+
+ FCItemIterator contentEndIter(endIter);
+ contentEndIter.SkipItemsNotWantingRubyParent();
+ // endIter must be on something doesn't want a ruby parent.
+ MOZ_ASSERT(contentEndIter != endIter);
+
+ // InterpretRubyWhitespace depends on the fact that any leading or
+ // trailing whitespace described in the spec have been trimmed at
+ // this point. With this precondition, it is safe not to check
+ // whether contentEndIter has been done.
+ RubyWhitespaceType whitespaceType =
+ InterpretRubyWhitespace(aState, endIter, contentEndIter);
+ if (whitespaceType == eRubyInterLevelWhitespace) {
+ // Remove inter-level whitespace.
+ bool atStart = (aIter == endIter);
+ endIter.DeleteItemsTo(this, contentEndIter);
+ if (atStart) {
+ aIter = endIter;
+ }
+ } else if (whitespaceType == eRubyInterSegmentWhitespace) {
+ // If this level container starts with inter-segment whitespaces,
+ // wrap them. Break at contentEndIter. Otherwise, leave it here.
+ // Break at endIter. They will be wrapped when we are here again.
+ if (aIter == endIter) {
+ MOZ_ASSERT(wrapperType == eTypeRubyBaseContainer,
+ "Inter-segment whitespace should be wrapped in rbc");
+ endIter = contentEndIter;
+ }
+ break;
+ } else if (wrapperType == eTypeRubyTextContainer &&
+ whitespaceType != eRubyInterLeafWhitespace) {
+ // Misparented inline content that's not inter-annotation
+ // whitespace doesn't belong in a pseudo ruby text container.
+ // Break at endIter.
+ break;
+ } else {
+ endIter = contentEndIter;
+ }
+ } while (!endIter.IsDone());
+
+ // It is possible that everything our parent wants us to wrap is
+ // simply an inter-level whitespace, which has been trimmed, or
+ // an inter-segment whitespace, which will be wrapped later.
+ // In those cases, don't create anything.
+ if (aIter != endIter) {
+ WrapItemsInPseudoParent(aParentContent, aParentStyle, wrapperType, aIter,
+ endIter);
+ }
+}
+
+/**
+ * This function trims leading and trailing whitespaces
+ * in the given item list.
+ */
+void nsCSSFrameConstructor::TrimLeadingAndTrailingWhitespaces(
+ nsFrameConstructorState& aState, FrameConstructionItemList& aItems) {
+ FCItemIterator iter(aItems);
+ if (!iter.IsDone() && iter.item().IsWhitespace(aState)) {
+ FCItemIterator spaceEndIter(iter);
+ spaceEndIter.SkipWhitespace(aState);
+ iter.DeleteItemsTo(this, spaceEndIter);
+ }
+
+ iter.SetToEnd();
+ if (!iter.AtStart()) {
+ FCItemIterator spaceEndIter(iter);
+ do {
+ iter.Prev();
+ if (iter.AtStart()) {
+ // It's fine to not check the first item, because we
+ // should have trimmed leading whitespaces above.
+ break;
+ }
+ } while (iter.item().IsWhitespace(aState));
+ iter.Next();
+ if (iter != spaceEndIter) {
+ iter.DeleteItemsTo(this, spaceEndIter);
+ }
+ }
+}
+
+/**
+ * This function walks through the child list (aItems) and creates
+ * needed pseudo ruby boxes to wrap misparented children.
+ */
+void nsCSSFrameConstructor::CreateNeededPseudoInternalRubyBoxes(
+ nsFrameConstructorState& aState, FrameConstructionItemList& aItems,
+ nsIFrame* aParentFrame) {
+ const ParentType ourParentType = GetParentType(aParentFrame);
+ if (!IsRubyParentType(ourParentType) ||
+ aItems.AllWantParentType(ourParentType)) {
+ return;
+ }
+
+ if (!IsRubyPseudo(aParentFrame) ||
+ ourParentType == eTypeRuby /* for 'display:block ruby' */) {
+ // Normally, ruby pseudo frames start from and end at some elements,
+ // which means they don't have leading and trailing whitespaces at
+ // all. But there are two cases where they do actually have leading
+ // or trailing whitespaces:
+ // 1. It is an inter-segment whitespace which in an individual ruby
+ // base container.
+ // 2. The pseudo frame starts from or ends at consecutive inline
+ // content, which is not pure whitespace, but includes some.
+ // In either case, the whitespaces are not the leading or trailing
+ // whitespaces defined in the spec, and thus should not be trimmed.
+ TrimLeadingAndTrailingWhitespaces(aState, aItems);
+ }
+
+ FCItemIterator iter(aItems);
+ nsIContent* parentContent = aParentFrame->GetContent();
+ ComputedStyle* parentStyle = aParentFrame->Style();
+ while (!iter.IsDone()) {
+ if (!iter.SkipItemsWantingParentType(ourParentType)) {
+ if (ourParentType == eTypeRuby) {
+ WrapItemsInPseudoRubyLevelContainer(aState, iter, parentStyle,
+ parentContent);
+ } else {
+ WrapItemsInPseudoRubyLeafBox(iter, parentStyle, parentContent);
+ }
+ }
+ }
+}
+
+/*
+ * This function works as follows: we walk through the child list (aItems) and
+ * find items that cannot have aParentFrame as their parent. We wrap
+ * continuous runs of such items into a FrameConstructionItem for a frame that
+ * gets them closer to their desired parents. For example, a run of non-row
+ * children of a row-group will get wrapped in a row. When we later construct
+ * the frame for this wrapper (in this case for the row), it'll be the correct
+ * parent for the cells in the set of items we wrapped or we'll wrap cells
+ * around everything else. At the end of this method, aItems is guaranteed to
+ * contain only items for frames that can be direct kids of aParentFrame.
+ */
+void nsCSSFrameConstructor::CreateNeededPseudoContainers(
+ nsFrameConstructorState& aState, FrameConstructionItemList& aItems,
+ nsIFrame* aParentFrame) {
+ ParentType ourParentType = GetParentType(aParentFrame);
+ if (IsRubyParentType(ourParentType) ||
+ aItems.AllWantParentType(ourParentType)) {
+ // Nothing to do here
+ return;
+ }
+
+ FCItemIterator iter(aItems);
+ do {
+ if (iter.SkipItemsWantingParentType(ourParentType)) {
+ // Nothing else to do here; we're finished
+ return;
+ }
+
+ // Now we're pointing to the first child that wants a different parent
+ // type.
+
+ // Now try to figure out what kids we can group together. We can generally
+ // group everything that has a different desired parent type from us. Two
+ // exceptions to this:
+ // 1) If our parent type is table, we can't group columns with anything
+ // else other than whitespace.
+ // 2) Whitespace that lies between two things we can group which both want
+ // a non-block parent should be dropped, even if we can't group them
+ // with each other and even if the whitespace wants a parent of
+ // ourParentType. Ends of the list count as things that don't want a
+ // block parent (so that for example we'll drop a whitespace-only list).
+
+ FCItemIterator endIter(iter); /* iterator to find the end of the group */
+ ParentType groupingParentType = endIter.item().DesiredParentType();
+ if (aItems.AllWantParentType(groupingParentType) &&
+ groupingParentType != eTypeBlock) {
+ // Just group them all and be done with it. We need the check for
+ // eTypeBlock here to catch the "all the items are whitespace" case
+ // described above.
+ endIter.SetToEnd();
+ } else {
+ // Locate the end of the group.
+
+ // Keep track of the type the previous item wanted, in case we have to
+ // deal with whitespace. Start it off with ourParentType, since that's
+ // the last thing |iter| would have skipped over.
+ ParentType prevParentType = ourParentType;
+ do {
+ // Walk an iterator past any whitespace that we might be able to drop
+ // from the list
+ FCItemIterator spaceEndIter(endIter);
+ if (prevParentType != eTypeBlock &&
+ !aParentFrame->IsGeneratedContentFrame() &&
+ spaceEndIter.item().IsWhitespace(aState)) {
+ bool trailingSpaces = spaceEndIter.SkipWhitespace(aState);
+
+ // We drop the whitespace in the following cases:
+ // 1) If these are not trailing spaces and the next item wants a table
+ // or table-part parent
+ // 2) If these are trailing spaces and aParentFrame is a
+ // tabular container according to rule 1.3 of CSS 2.1 Sec 17.2.1.
+ // (Being a tabular container pretty much means ourParentType is
+ // not eTypeBlock besides the eTypeColGroup case, which won't
+ // reach here.)
+ if ((!trailingSpaces &&
+ IsTableParentType(spaceEndIter.item().DesiredParentType())) ||
+ (trailingSpaces && ourParentType != eTypeBlock)) {
+ bool updateStart = (iter == endIter);
+ endIter.DeleteItemsTo(this, spaceEndIter);
+ NS_ASSERTION(trailingSpaces == endIter.IsDone(),
+ "These should match");
+
+ if (updateStart) {
+ iter = endIter;
+ }
+
+ if (trailingSpaces) {
+ break; /* Found group end */
+ }
+
+ if (updateStart) {
+ // Update groupingParentType, since it might have been eTypeBlock
+ // just because of the whitespace.
+ groupingParentType = iter.item().DesiredParentType();
+ }
+ }
+ }
+
+ // Now endIter points to a non-whitespace item or a non-droppable
+ // whitespace item. In the latter case, if this is the end of the group
+ // we'll traverse this whitespace again. But it'll all just be quick
+ // DesiredParentType() checks which will match ourParentType (that's
+ // what it means that this is the group end), so it's OK.
+ // However, when we are grouping a ruby parent, and endIter points to
+ // a non-droppable whitespace, if the next non-whitespace item also
+ // wants a ruby parent, the whitespace should also be included into
+ // the current ruby container.
+ prevParentType = endIter.item().DesiredParentType();
+ if (prevParentType == ourParentType &&
+ (endIter == spaceEndIter || spaceEndIter.IsDone() ||
+ !IsRubyParentType(groupingParentType) ||
+ !IsRubyParentType(spaceEndIter.item().DesiredParentType()))) {
+ // End the group at endIter.
+ break;
+ }
+
+ if (ourParentType == eTypeTable &&
+ (prevParentType == eTypeColGroup) !=
+ (groupingParentType == eTypeColGroup)) {
+ // Either we started with columns and now found something else, or
+ // vice versa. In any case, end the grouping.
+ break;
+ }
+
+ // If we have some whitespace that we were not able to drop and there is
+ // an item after the whitespace that is already properly parented, then
+ // make sure to include the spaces in our group but stop the group after
+ // that.
+ if (spaceEndIter != endIter && !spaceEndIter.IsDone() &&
+ ourParentType == spaceEndIter.item().DesiredParentType()) {
+ endIter = spaceEndIter;
+ break;
+ }
+
+ // Include the whitespace we didn't drop (if any) in the group.
+ endIter = spaceEndIter;
+ prevParentType = endIter.item().DesiredParentType();
+
+ endIter.Next();
+ } while (!endIter.IsDone());
+ }
+
+ if (iter == endIter) {
+ // Nothing to wrap here; just skipped some whitespace
+ continue;
+ }
+
+ // Now group together all the items between iter and endIter. The right
+ // parent type to use depends on ourParentType.
+ ParentType wrapperType;
+ switch (ourParentType) {
+ case eTypeRow:
+ // The parent type for a cell is eTypeBlock, since that's what a cell
+ // looks like to its kids.
+ wrapperType = eTypeBlock;
+ break;
+ case eTypeRowGroup:
+ wrapperType = eTypeRow;
+ break;
+ case eTypeTable:
+ // Either colgroup or rowgroup, depending on what we're grouping.
+ wrapperType =
+ groupingParentType == eTypeColGroup ? eTypeColGroup : eTypeRowGroup;
+ break;
+ case eTypeColGroup:
+ MOZ_CRASH("Colgroups should be suppresing non-col child items");
+ default:
+ NS_ASSERTION(ourParentType == eTypeBlock, "Unrecognized parent type");
+ if (IsRubyParentType(groupingParentType)) {
+ wrapperType = eTypeRuby;
+ } else {
+ NS_ASSERTION(IsTableParentType(groupingParentType),
+ "groupingParentType should be either Ruby or table");
+ wrapperType = eTypeTable;
+ }
+ }
+
+ ComputedStyle* parentStyle = aParentFrame->Style();
+ WrapItemsInPseudoParent(aParentFrame->GetContent(), parentStyle,
+ wrapperType, iter, endIter);
+
+ // Now |iter| points to the item that was the first one we didn't wrap;
+ // loop and see whether we need to skip it or wrap it in something
+ // different.
+ } while (!iter.IsDone());
+}
+
+/**
+ * This method wraps frame construction item from |aIter| to
+ * |aEndIter|. After it returns, aIter points to the first item
+ * after the wrapper.
+ */
+void nsCSSFrameConstructor::WrapItemsInPseudoParent(
+ nsIContent* aParentContent, ComputedStyle* aParentStyle,
+ ParentType aWrapperType, FCItemIterator& aIter,
+ const FCItemIterator& aEndIter) {
+ const PseudoParentData& pseudoData = sPseudoParentData[aWrapperType];
+ PseudoStyleType pseudoType = pseudoData.mPseudoType;
+ auto& parentDisplay = *aParentStyle->StyleDisplay();
+ auto parentDisplayInside = parentDisplay.DisplayInside();
+
+ // XXXmats should we use IsInlineInsideStyle() here instead? seems odd to
+ // exclude RubyBaseContainer/RubyTextContainer...
+ if (pseudoType == PseudoStyleType::table &&
+ (parentDisplay.IsInlineFlow() ||
+ parentDisplayInside == StyleDisplayInside::RubyBase ||
+ parentDisplayInside == StyleDisplayInside::RubyText)) {
+ pseudoType = PseudoStyleType::inlineTable;
+ }
+
+ RefPtr<ComputedStyle> wrapperStyle;
+ if (pseudoData.mFCData.mBits & FCDATA_IS_WRAPPER_ANON_BOX) {
+ wrapperStyle = mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ pseudoType, aParentStyle);
+ } else {
+ wrapperStyle =
+ mPresShell->StyleSet()->ResolveNonInheritingAnonymousBoxStyle(
+ pseudoType);
+ }
+
+ FrameConstructionItem* newItem = new (this)
+ FrameConstructionItem(&pseudoData.mFCData,
+ // Use the content of our parent frame
+ aParentContent, wrapperStyle.forget(), true);
+
+ const nsStyleDisplay* disp = newItem->mComputedStyle->StyleDisplay();
+ // Here we're cheating a tad... technically, table-internal items should be
+ // inline if aParentFrame is inline, but they'll get wrapped in an
+ // inline-table in the end, so it'll all work out. In any case, arguably
+ // we don't need to maintain this state at this point... but it's better
+ // to, I guess.
+ newItem->mIsAllInline = disp->IsInlineOutsideStyle();
+
+ bool isRuby = disp->IsRubyDisplayType();
+ // All types of ruby frames need a block frame to provide line layout,
+ // hence they are always line participant.
+ newItem->mIsLineParticipant = isRuby;
+
+ if (!isRuby) {
+ // Table pseudo frames always induce line boundaries around their
+ // contents.
+ newItem->mChildItems.SetLineBoundaryAtStart(true);
+ newItem->mChildItems.SetLineBoundaryAtEnd(true);
+ }
+ // The parent of the items in aItems is also the parent of the items
+ // in mChildItems
+ newItem->mChildItems.SetParentHasNoShadowDOM(
+ aIter.List()->ParentHasNoShadowDOM());
+
+ // Eat up all items between |aIter| and |aEndIter| and put them in our
+ // wrapper Advances |aIter| to point to |aEndIter|.
+ aIter.AppendItemsToList(this, aEndIter, newItem->mChildItems);
+
+ aIter.InsertItem(newItem);
+}
+
+void nsCSSFrameConstructor::CreateNeededPseudoSiblings(
+ nsFrameConstructorState& aState, FrameConstructionItemList& aItems,
+ nsIFrame* aParentFrame) {
+ if (aItems.IsEmpty() || GetParentType(aParentFrame) != eTypeRuby) {
+ return;
+ }
+
+ FCItemIterator iter(aItems);
+ StyleDisplay firstDisplay =
+ iter.item().mComputedStyle->StyleDisplay()->mDisplay;
+ if (firstDisplay == StyleDisplay::RubyBaseContainer) {
+ return;
+ }
+ NS_ASSERTION(firstDisplay == StyleDisplay::RubyTextContainer,
+ "Child of ruby frame should either a rbc or a rtc");
+
+ const PseudoParentData& pseudoData =
+ sPseudoParentData[eTypeRubyBaseContainer];
+ RefPtr<ComputedStyle> pseudoStyle =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ pseudoData.mPseudoType, aParentFrame->Style());
+ FrameConstructionItem* newItem = new (this) FrameConstructionItem(
+ &pseudoData.mFCData,
+ // Use the content of the parent frame
+ aParentFrame->GetContent(), pseudoStyle.forget(), true);
+ newItem->mIsAllInline = true;
+ newItem->mChildItems.SetParentHasNoShadowDOM(true);
+ iter.InsertItem(newItem);
+}
+
+#ifdef DEBUG
+/**
+ * Returns true iff aFrame should be wrapped in an anonymous flex/grid item,
+ * rather than being a direct child of aContainerFrame.
+ *
+ * NOTE: aContainerFrame must be a flex or grid container - this function is
+ * purely for sanity-checking the children of these container types.
+ * NOTE: See also NeedsAnonFlexOrGridItem(), for the non-debug version of this
+ * logic (which operates a bit earlier, on FCData instead of frames).
+ */
+static bool FrameWantsToBeInAnonymousItem(const nsIFrame* aContainerFrame,
+ const nsIFrame* aFrame) {
+ MOZ_ASSERT(aContainerFrame->IsFlexOrGridContainer());
+
+ // Any line-participant frames (e.g. text) definitely want to be wrapped in
+ // an anonymous flex/grid item.
+ if (aFrame->IsFrameOfType(nsIFrame::eLineParticipant)) {
+ return true;
+ }
+
+ // If the container is a -webkit-{inline-}box or -moz-{inline-}box container,
+ // then placeholders also need to be wrapped, for compatibility.
+ if (IsFlexContainerForLegacyBox(aContainerFrame) &&
+ aFrame->IsPlaceholderFrame()) {
+ return true;
+ }
+
+ return false;
+}
+#endif
+
+static void VerifyGridFlexContainerChildren(nsIFrame* aParentFrame,
+ const nsFrameList& aChildren) {
+#ifdef DEBUG
+ if (!aParentFrame->IsFlexOrGridContainer()) {
+ return;
+ }
+
+ bool prevChildWasAnonItem = false;
+ for (const nsIFrame* child : aChildren) {
+ MOZ_ASSERT(!FrameWantsToBeInAnonymousItem(aParentFrame, child),
+ "frame wants to be inside an anonymous item, but it isn't");
+ if (IsAnonymousFlexOrGridItem(child)) {
+ AssertAnonymousFlexOrGridItemParent(child, aParentFrame);
+ MOZ_ASSERT(!prevChildWasAnonItem, "two anon items in a row");
+ nsIFrame* firstWrappedChild = child->PrincipalChildList().FirstChild();
+ MOZ_ASSERT(firstWrappedChild, "anonymous item shouldn't be empty");
+ prevChildWasAnonItem = true;
+ } else {
+ prevChildWasAnonItem = false;
+ }
+ }
+#endif
+}
+
+inline void nsCSSFrameConstructor::ConstructFramesFromItemList(
+ nsFrameConstructorState& aState, FrameConstructionItemList& aItems,
+ nsContainerFrame* aParentFrame, bool aParentIsWrapperAnonBox,
+ nsFrameList& aFrameList) {
+ // Ensure aParentIsWrapperAnonBox is correct. We _could_ compute it directly,
+ // but it would be a bit slow, which is why we pass it from callers, who have
+ // that information offhand in many cases.
+ MOZ_ASSERT(ParentIsWrapperAnonBox(aParentFrame) == aParentIsWrapperAnonBox);
+
+ CreateNeededPseudoContainers(aState, aItems, aParentFrame);
+ CreateNeededAnonFlexOrGridItems(aState, aItems, aParentFrame);
+ CreateNeededPseudoInternalRubyBoxes(aState, aItems, aParentFrame);
+ CreateNeededPseudoSiblings(aState, aItems, aParentFrame);
+
+ bool listItemListIsDirty = false;
+ for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) {
+ NS_ASSERTION(iter.item().DesiredParentType() == GetParentType(aParentFrame),
+ "Needed pseudos didn't get created; expect bad things");
+ // display:list-item boxes affects the start value of the "list-item"
+ // counter when an <ol reversed> element doesn't have an explicit start
+ // value.
+ if (!listItemListIsDirty &&
+ iter.item().mComputedStyle->StyleList()->mMozListReversed ==
+ StyleMozListReversed::True &&
+ iter.item().mComputedStyle->StyleDisplay()->IsListItem()) {
+ auto* list = mCounterManager.CounterListFor(nsGkAtoms::list_item);
+ list->SetDirty();
+ CountersDirty();
+ listItemListIsDirty = true;
+ }
+ ConstructFramesFromItem(aState, iter, aParentFrame, aFrameList);
+ }
+
+ VerifyGridFlexContainerChildren(aParentFrame, aFrameList);
+
+ if (aParentIsWrapperAnonBox) {
+ for (nsIFrame* f : aFrameList) {
+ f->SetParentIsWrapperAnonBox();
+ }
+ }
+}
+
+void nsCSSFrameConstructor::AddFCItemsForAnonymousContent(
+ nsFrameConstructorState& aState, nsContainerFrame* aFrame,
+ const nsTArray<nsIAnonymousContentCreator::ContentInfo>& aAnonymousItems,
+ FrameConstructionItemList& aItemsToConstruct, ItemFlags aExtraFlags) {
+ for (const auto& info : aAnonymousItems) {
+ nsIContent* content = info.mContent;
+ // Gecko-styled nodes should have no pending restyle flags.
+ // Assert some things about this content
+ MOZ_ASSERT(!(content->GetFlags() &
+ (NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME)),
+ "Should not be marked as needing frames");
+ MOZ_ASSERT(!content->GetPrimaryFrame(), "Should have no existing frame");
+ MOZ_ASSERT(!content->IsComment() && !content->IsProcessingInstruction(),
+ "Why is someone creating garbage anonymous content");
+
+ // Make sure we eagerly performed the servo cascade when the anonymous
+ // nodes were created.
+ MOZ_ASSERT(!content->IsElement() || content->AsElement()->HasServoData());
+
+ RefPtr<ComputedStyle> computedStyle = ResolveComputedStyle(content);
+
+ ItemFlags flags = aExtraFlags;
+ flags += ItemFlag::AllowPageBreak;
+
+ AddFrameConstructionItemsInternal(aState, content, aFrame, true,
+ computedStyle, flags, aItemsToConstruct);
+ }
+}
+
+void nsCSSFrameConstructor::ProcessChildren(
+ nsFrameConstructorState& aState, nsIContent* aContent,
+ ComputedStyle* aComputedStyle, nsContainerFrame* aFrame,
+ const bool aCanHaveGeneratedContent, nsFrameList& aFrameList,
+ const bool aAllowBlockStyles, nsIFrame* aPossiblyLeafFrame) {
+ MOZ_ASSERT(aFrame, "Must have parent frame here");
+ MOZ_ASSERT(aFrame->GetContentInsertionFrame() == aFrame,
+ "Parent frame in ProcessChildren should be its own "
+ "content insertion frame");
+
+ const uint32_t kMaxDepth = 2 * MAX_REFLOW_DEPTH;
+ static_assert(kMaxDepth <= UINT16_MAX, "mCurrentDepth type is too narrow");
+ AutoRestore<uint16_t> savedDepth(mCurrentDepth);
+ if (mCurrentDepth != UINT16_MAX) {
+ ++mCurrentDepth;
+ }
+
+ if (!aPossiblyLeafFrame) {
+ aPossiblyLeafFrame = aFrame;
+ }
+
+ // XXXbz ideally, this would do all the pushing of various
+ // containing blocks as needed, so callers don't have to do it...
+
+ // Check that our parent frame is a block before allowing ::first-letter/line.
+ // E.g. <button style="display:grid"> should not allow it.
+ const bool allowFirstPseudos =
+ aAllowBlockStyles && aFrame->IsBlockFrameOrSubclass();
+ bool haveFirstLetterStyle = false, haveFirstLineStyle = false;
+ if (allowFirstPseudos) {
+ ShouldHaveSpecialBlockStyle(aContent, aComputedStyle, &haveFirstLetterStyle,
+ &haveFirstLineStyle);
+ }
+
+ // The logic here needs to match the logic in GetFloatContainingBlock()
+ nsFrameConstructorSaveState floatSaveState;
+ if (ShouldSuppressFloatingOfDescendants(aFrame)) {
+ aState.PushFloatContainingBlock(nullptr, floatSaveState);
+ } else if (aFrame->IsFloatContainingBlock()) {
+ aState.PushFloatContainingBlock(aFrame, floatSaveState);
+ }
+
+ AutoFrameConstructionItemList itemsToConstruct(this);
+
+ // If we have first-letter or first-line style then frames can get
+ // moved around so don't set these flags.
+ if (allowFirstPseudos && !haveFirstLetterStyle && !haveFirstLineStyle) {
+ itemsToConstruct.SetLineBoundaryAtStart(true);
+ itemsToConstruct.SetLineBoundaryAtEnd(true);
+ }
+
+ // Create any anonymous frames we need here. This must happen before the
+ // non-anonymous children are processed to ensure that popups are never
+ // constructed before the popupset.
+ AutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> anonymousItems;
+ GetAnonymousContent(aContent, aPossiblyLeafFrame, anonymousItems);
+#ifdef DEBUG
+ for (uint32_t i = 0; i < anonymousItems.Length(); ++i) {
+ MOZ_ASSERT(anonymousItems[i].mContent->IsRootOfNativeAnonymousSubtree(),
+ "Content should know it's an anonymous subtree");
+ }
+#endif
+ AddFCItemsForAnonymousContent(aState, aFrame, anonymousItems,
+ itemsToConstruct);
+
+ nsBlockFrame* listItem = nullptr;
+ bool isOutsideMarker = false;
+ if (!aPossiblyLeafFrame->IsLeaf()) {
+ // :before/:after content should have the same style parent as normal kids.
+ //
+ // Note that we don't use this style for looking up things like special
+ // block styles because in some cases involving table pseudo-frames it has
+ // nothing to do with the parent frame's desired behavior.
+ ComputedStyle* computedStyle;
+
+ if (aCanHaveGeneratedContent) {
+ auto* styleParentFrame =
+ nsIFrame::CorrectStyleParentFrame(aFrame, PseudoStyleType::NotPseudo);
+ computedStyle = styleParentFrame->Style();
+ if (computedStyle->StyleDisplay()->IsListItem() &&
+ (listItem = do_QueryFrame(aFrame)) &&
+ !styleParentFrame->IsFieldSetFrame()) {
+ isOutsideMarker = computedStyle->StyleList()->mListStylePosition ==
+ NS_STYLE_LIST_STYLE_POSITION_OUTSIDE;
+ CreateGeneratedContentItem(aState, aFrame, *aContent->AsElement(),
+ *computedStyle, PseudoStyleType::marker,
+ itemsToConstruct);
+ }
+ // Probe for generated content before
+ CreateGeneratedContentItem(aState, aFrame, *aContent->AsElement(),
+ *computedStyle, PseudoStyleType::before,
+ itemsToConstruct);
+ }
+
+ const bool addChildItems = MOZ_LIKELY(mCurrentDepth < kMaxDepth);
+ if (!addChildItems) {
+ NS_WARNING("ProcessChildren max depth exceeded");
+ }
+
+ FlattenedChildIterator iter(aContent);
+ const InsertionPoint insertion(aFrame, aContent);
+ for (nsIContent* child = iter.GetNextChild(); child;
+ child = iter.GetNextChild()) {
+ MOZ_ASSERT(insertion.mContainer == GetInsertionPoint(child).mContainer,
+ "GetInsertionPoint should agree with us");
+ if (addChildItems) {
+ AddFrameConstructionItems(aState, child, iter.ShadowDOMInvolved(),
+ insertion, itemsToConstruct);
+ } else {
+ ClearLazyBits(child, child->GetNextSibling());
+ }
+ }
+ itemsToConstruct.SetParentHasNoShadowDOM(!iter.ShadowDOMInvolved());
+
+ if (aCanHaveGeneratedContent) {
+ // Probe for generated content after
+ CreateGeneratedContentItem(aState, aFrame, *aContent->AsElement(),
+ *computedStyle, PseudoStyleType::after,
+ itemsToConstruct);
+ }
+ } else {
+ ClearLazyBits(aContent->GetFirstChild(), nullptr);
+ }
+
+ ConstructFramesFromItemList(aState, itemsToConstruct, aFrame,
+ /* aParentIsWrapperAnonBox = */ false,
+ aFrameList);
+
+ NS_ASSERTION(!allowFirstPseudos || !aFrame->IsXULBoxFrame(),
+ "can't be both block and box");
+
+ if (listItem) {
+ if (auto* markerFrame = nsLayoutUtils::GetMarkerFrame(aContent)) {
+ for (auto* childFrame : aFrameList) {
+ if (markerFrame == childFrame) {
+ if (isOutsideMarker) {
+ // SetMarkerFrameForListItem will add childFrame to the kBulletList
+ aFrameList.RemoveFrame(childFrame);
+ auto* grandParent = listItem->GetParent()->GetParent();
+ if (listItem->Style()->GetPseudoType() ==
+ PseudoStyleType::columnContent &&
+ grandParent && grandParent->IsColumnSetWrapperFrame()) {
+ listItem = do_QueryFrame(grandParent);
+ MOZ_ASSERT(listItem,
+ "ColumnSetWrapperFrame is expected to be "
+ "a nsBlockFrame subclass");
+ childFrame->SetParent(listItem);
+ }
+ }
+ listItem->SetMarkerFrameForListItem(childFrame);
+ MOZ_ASSERT(listItem->HasAnyStateBits(
+ NS_BLOCK_FRAME_HAS_OUTSIDE_MARKER) == isOutsideMarker);
+ break;
+ }
+ }
+ }
+ }
+
+ if (haveFirstLetterStyle) {
+ WrapFramesInFirstLetterFrame(aFrame, aFrameList);
+ }
+ if (haveFirstLineStyle) {
+ WrapFramesInFirstLineFrame(aState, aContent, aFrame, nullptr, aFrameList);
+ }
+
+ // We might end up with first-line frames that change
+ // AnyKidsNeedBlockParent() without changing itemsToConstruct, but that
+ // should never happen for cases whan aFrame->IsXULBoxFrame().
+ NS_ASSERTION(!haveFirstLineStyle || !aFrame->IsXULBoxFrame(),
+ "Shouldn't have first-line style if we're a box");
+ NS_ASSERTION(
+ !aFrame->IsXULBoxFrame() ||
+ itemsToConstruct.AnyItemsNeedBlockParent() ==
+ (AnyKidsNeedBlockParent(aFrameList.FirstChild()) != nullptr),
+ "Something went awry in our block parent calculations");
+
+ if (aFrame->IsXULBoxFrame() && itemsToConstruct.AnyItemsNeedBlockParent()) {
+ // XXXbz we could do this on the FrameConstructionItemList level,
+ // no? And if we cared we could look through the item list
+ // instead of groveling through the framelist here..
+ RefPtr<ComputedStyle> blockSC =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::mozXULAnonymousBlock, aFrame->Style());
+ nsBlockFrame* blockFrame = NS_NewBlockFrame(mPresShell, blockSC);
+ // We might, in theory, want to set NS_BLOCK_FLOAT_MGR and
+ // NS_BLOCK_MARGIN_ROOT, but I think it's a bad idea given that
+ // a real block placed here wouldn't get those set on it.
+
+ InitAndRestoreFrame(aState, aContent, aFrame, blockFrame, false);
+
+ NS_ASSERTION(!blockFrame->HasView(), "need to do view reparenting");
+ ReparentFrames(this, blockFrame, aFrameList, false);
+
+ blockFrame->SetInitialChildList(kPrincipalList, aFrameList);
+ NS_ASSERTION(aFrameList.IsEmpty(), "How did that happen?");
+ aFrameList.Clear();
+ aFrameList.AppendFrame(nullptr, blockFrame);
+
+ aFrame->AddStateBits(NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK);
+ MOZ_ASSERT(!aFrame->IsLeaf(), "Why do we have an nsLeafBoxFrame here?");
+ aFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+ }
+}
+
+//----------------------------------------------------------------------
+
+// Support for :first-line style
+
+// Special routine to handle placing a list of frames into a block
+// frame that has first-line style. The routine ensures that the first
+// collection of inline frames end up in a first-line frame.
+// NOTE: aState may have containing block information related to a
+// different part of the frame tree than where the first line occurs.
+// In particular aState may be set up for where ContentInserted or
+// ContentAppended is inserting content, which may be some
+// non-first-in-flow continuation of the block to which the first-line
+// belongs. So this function needs to be careful about how it uses
+// aState.
+void nsCSSFrameConstructor::WrapFramesInFirstLineFrame(
+ nsFrameConstructorState& aState, nsIContent* aBlockContent,
+ nsContainerFrame* aBlockFrame, nsFirstLineFrame* aLineFrame,
+ nsFrameList& aFrameList) {
+ // Extract any initial inline frames from aFrameList so we can put them
+ // in the first-line.
+ nsFrameList firstLineChildren =
+ aFrameList.Split([](nsIFrame* f) { return !f->IsInlineOutside(); });
+
+ if (firstLineChildren.IsEmpty()) {
+ // Nothing is supposed to go into the first-line; nothing to do
+ return;
+ }
+
+ if (!aLineFrame) {
+ // Create line frame
+ ComputedStyle* parentStyle = nsIFrame::CorrectStyleParentFrame(
+ aBlockFrame, PseudoStyleType::firstLine)
+ ->Style();
+ RefPtr<ComputedStyle> firstLineStyle =
+ GetFirstLineStyle(aBlockContent, parentStyle);
+
+ aLineFrame = NS_NewFirstLineFrame(mPresShell, firstLineStyle);
+
+ // Initialize the line frame
+ InitAndRestoreFrame(aState, aBlockContent, aBlockFrame, aLineFrame);
+
+ // The lineFrame will be the block's first child; the rest of the
+ // frame list (after lastInlineFrame) will be the second and
+ // subsequent children; insert lineFrame into aFrameList.
+ aFrameList.InsertFrame(nullptr, nullptr, aLineFrame);
+
+ NS_ASSERTION(aLineFrame->Style() == firstLineStyle,
+ "Bogus style on line frame");
+ }
+
+ // Give the inline frames to the lineFrame <b>after</b> reparenting them
+ ReparentFrames(this, aLineFrame, firstLineChildren, true);
+ if (aLineFrame->PrincipalChildList().IsEmpty() &&
+ aLineFrame->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
+ aLineFrame->SetInitialChildList(kPrincipalList, firstLineChildren);
+ } else {
+ AppendFrames(aLineFrame, kPrincipalList, firstLineChildren);
+ }
+}
+
+// Special routine to handle appending a new frame to a block frame's
+// child list. Takes care of placing the new frame into the right
+// place when first-line style is present.
+void nsCSSFrameConstructor::AppendFirstLineFrames(
+ nsFrameConstructorState& aState, nsIContent* aBlockContent,
+ nsContainerFrame* aBlockFrame, nsFrameList& aFrameList) {
+ // It's possible that aBlockFrame needs to have a first-line frame
+ // created because it doesn't currently have any children.
+ const nsFrameList& blockKids = aBlockFrame->PrincipalChildList();
+ if (blockKids.IsEmpty()) {
+ WrapFramesInFirstLineFrame(aState, aBlockContent, aBlockFrame, nullptr,
+ aFrameList);
+ return;
+ }
+
+ // Examine the last block child - if it's a first-line frame then
+ // appended frames need special treatment.
+ nsIFrame* lastBlockKid = blockKids.LastChild();
+ if (!lastBlockKid->IsLineFrame()) {
+ // No first-line frame at the end of the list, therefore there is
+ // an intervening block between any first-line frame the frames
+ // we are appending. Therefore, we don't need any special
+ // treatment of the appended frames.
+ return;
+ }
+
+ nsFirstLineFrame* lineFrame = static_cast<nsFirstLineFrame*>(lastBlockKid);
+ WrapFramesInFirstLineFrame(aState, aBlockContent, aBlockFrame, lineFrame,
+ aFrameList);
+}
+
+void nsCSSFrameConstructor::CheckForFirstLineInsertion(
+ nsIFrame* aParentFrame, nsFrameList& aFrameList) {
+ MOZ_ASSERT(aParentFrame->Style()->HasPseudoElementData(),
+ "Why were we called?");
+
+ if (aFrameList.IsEmpty()) {
+ // Happens often enough, with the caption stuff. No need to do the ancestor
+ // walk here.
+ return;
+ }
+
+ class RestyleManager* restyleManager = RestyleManager();
+
+ // Check whether there's a ::first-line on the path up from aParentFrame.
+ // Note that we can't stop until we've run out of ancestors with
+ // pseudo-element data, because the first-letter might be somewhere way up the
+ // tree; in particular it might be past our containing block.
+ nsIFrame* ancestor = aParentFrame;
+ while (ancestor) {
+ if (!ancestor->Style()->HasPseudoElementData()) {
+ // We know we won't find a ::first-line now.
+ return;
+ }
+
+ if (!ancestor->IsLineFrame()) {
+ ancestor = ancestor->GetParent();
+ continue;
+ }
+
+ if (!ancestor->Style()->IsPseudoElement()) {
+ // This is a continuation lineframe, not the first line; no need to do
+ // anything to the styles.
+ return;
+ }
+
+ // Fix up the styles of aFrameList for ::first-line.
+ for (nsIFrame* f : aFrameList) {
+ restyleManager->ReparentComputedStyleForFirstLine(f);
+ }
+ return;
+ }
+}
+
+//----------------------------------------------------------------------
+
+// First-letter support
+
+// Determine how many characters in the text fragment apply to the
+// first letter
+static int32_t FirstLetterCount(const nsTextFragment* aFragment) {
+ int32_t count = 0;
+ int32_t firstLetterLength = 0;
+
+ int32_t i, n = aFragment->GetLength();
+ for (i = 0; i < n; i++) {
+ char16_t ch = aFragment->CharAt(i);
+ // FIXME: take content language into account when deciding whitespace.
+ if (dom::IsSpaceCharacter(ch)) {
+ if (firstLetterLength) {
+ break;
+ }
+ count++;
+ continue;
+ }
+ // XXX I18n
+ if ((ch == '\'') || (ch == '\"')) {
+ if (firstLetterLength) {
+ break;
+ }
+ // keep looping
+ firstLetterLength = 1;
+ } else {
+ count++;
+ break;
+ }
+ }
+
+ return count;
+}
+
+static bool NeedFirstLetterContinuation(Text* aText) {
+ MOZ_ASSERT(aText, "null ptr");
+ int32_t flc = FirstLetterCount(&aText->TextFragment());
+ int32_t tl = aText->TextDataLength();
+ return flc < tl;
+}
+
+static bool IsFirstLetterContent(Text* aText) {
+ return aText->TextDataLength() && !aText->TextIsOnlyWhitespace();
+}
+
+/**
+ * Create a letter frame, only make it a floating frame.
+ */
+nsFirstLetterFrame* nsCSSFrameConstructor::CreateFloatingLetterFrame(
+ nsFrameConstructorState& aState, Text* aTextContent, nsIFrame* aTextFrame,
+ nsContainerFrame* aParentFrame, ComputedStyle* aParentComputedStyle,
+ ComputedStyle* aComputedStyle, nsFrameList& aResult) {
+ MOZ_ASSERT(aParentComputedStyle);
+
+ nsFirstLetterFrame* letterFrame =
+ NS_NewFirstLetterFrame(mPresShell, aComputedStyle);
+ // We don't want to use a text content for a non-text frame (because we want
+ // its primary frame to be a text frame).
+ nsIContent* letterContent = aParentFrame->GetContent();
+ nsContainerFrame* containingBlock =
+ aState.GetGeometricParent(*aComputedStyle->StyleDisplay(), aParentFrame);
+ InitAndRestoreFrame(aState, letterContent, containingBlock, letterFrame);
+
+ // Init the text frame to refer to the letter frame.
+ //
+ // Make sure we get a proper style for it (the one passed in is for the letter
+ // frame and will have the float property set on it; the text frame shouldn't
+ // have that set).
+ ServoStyleSet* styleSet = mPresShell->StyleSet();
+ RefPtr<ComputedStyle> textSC =
+ styleSet->ResolveStyleForText(aTextContent, aComputedStyle);
+ aTextFrame->SetComputedStyleWithoutNotification(textSC);
+ InitAndRestoreFrame(aState, aTextContent, letterFrame, aTextFrame);
+
+ // And then give the text frame to the letter frame
+ SetInitialSingleChild(letterFrame, aTextFrame);
+
+ // See if we will need to continue the text frame (does it contain
+ // more than just the first-letter text or not?) If it does, then we
+ // create (in advance) a continuation frame for it.
+ nsIFrame* nextTextFrame = nullptr;
+ if (NeedFirstLetterContinuation(aTextContent)) {
+ // Create continuation
+ nextTextFrame = CreateContinuingFrame(aTextFrame, aParentFrame);
+ RefPtr<ComputedStyle> newSC =
+ styleSet->ResolveStyleForText(aTextContent, aParentComputedStyle);
+ nextTextFrame->SetComputedStyle(newSC);
+ }
+
+ NS_ASSERTION(aResult.IsEmpty(), "aResult should be an empty nsFrameList!");
+ // Put the new float before any of the floats in the block we're doing
+ // first-letter for, that is, before any floats whose parent is
+ // containingBlock.
+ nsFrameList::FrameLinkEnumerator link(aState.mFloatedList);
+ while (!link.AtEnd() && link.NextFrame()->GetParent() != containingBlock) {
+ link.Next();
+ }
+
+ aState.AddChild(letterFrame, aResult, letterContent, aParentFrame, false,
+ true, false, true, link.PrevFrame());
+
+ if (nextTextFrame) {
+ aResult.AppendFrame(nullptr, nextTextFrame);
+ }
+
+ return letterFrame;
+}
+
+/**
+ * Create a new letter frame for aTextFrame. The letter frame will be
+ * a child of aParentFrame.
+ */
+void nsCSSFrameConstructor::CreateLetterFrame(
+ nsContainerFrame* aBlockFrame, nsContainerFrame* aBlockContinuation,
+ Text* aTextContent, nsContainerFrame* aParentFrame, nsFrameList& aResult) {
+ NS_ASSERTION(aBlockFrame->IsBlockFrameOrSubclass(), "Not a block frame?");
+
+ // Get a ComputedStyle for the first-letter-frame.
+ //
+ // Keep this in sync with nsBlockFrame::UpdatePseudoElementStyles.
+ nsIFrame* parentFrame = nsIFrame::CorrectStyleParentFrame(
+ aParentFrame, PseudoStyleType::firstLetter);
+
+ ComputedStyle* parentComputedStyle = parentFrame->Style();
+
+ // Use content from containing block so that we can actually
+ // find a matching style rule.
+ nsIContent* blockContent = aBlockFrame->GetContent();
+
+ // Create first-letter style rule
+ RefPtr<ComputedStyle> sc =
+ GetFirstLetterStyle(blockContent, parentComputedStyle);
+
+ if (sc) {
+ if (parentFrame->IsLineFrame()) {
+ nsIFrame* parentIgnoringFirstLine = nsIFrame::CorrectStyleParentFrame(
+ aBlockFrame, PseudoStyleType::firstLetter);
+
+ sc = mPresShell->StyleSet()->ReparentComputedStyle(
+ sc, parentComputedStyle, parentIgnoringFirstLine->Style(),
+ parentComputedStyle, blockContent->AsElement());
+ }
+
+ RefPtr<ComputedStyle> textSC =
+ mPresShell->StyleSet()->ResolveStyleForText(aTextContent, sc);
+
+ // Create a new text frame (the original one will be discarded)
+ // pass a temporary stylecontext, the correct one will be set
+ // later. Start off by unsetting the primary frame for
+ // aTextContent, so it's no longer pointing to the to-be-destroyed
+ // frame.
+ // XXXbz it would be really nice to destroy the old frame _first_,
+ // then create the new one, so we could avoid this hack.
+ aTextContent->SetPrimaryFrame(nullptr);
+ nsIFrame* textFrame = NS_NewTextFrame(mPresShell, textSC);
+
+ NS_ASSERTION(aBlockContinuation == GetFloatContainingBlock(aParentFrame),
+ "Containing block is confused");
+ nsFrameConstructorState state(
+ mPresShell, GetAbsoluteContainingBlock(aParentFrame, FIXED_POS),
+ GetAbsoluteContainingBlock(aParentFrame, ABS_POS), aBlockContinuation);
+
+ // Create the right type of first-letter frame
+ const nsStyleDisplay* display = sc->StyleDisplay();
+ nsFirstLetterFrame* letterFrame;
+ if (display->IsFloatingStyle() &&
+ !SVGUtils::IsInSVGTextSubtree(aParentFrame)) {
+ // Make a floating first-letter frame
+ letterFrame = CreateFloatingLetterFrame(state, aTextContent, textFrame,
+ aParentFrame, parentComputedStyle,
+ sc, aResult);
+ } else {
+ // Make an inflow first-letter frame
+ letterFrame = NS_NewFirstLetterFrame(mPresShell, sc);
+
+ // Initialize the first-letter-frame. We don't want to use a text
+ // content for a non-text frame (because we want its primary frame to
+ // be a text frame).
+ nsIContent* letterContent = aParentFrame->GetContent();
+ letterFrame->Init(letterContent, aParentFrame, nullptr);
+
+ InitAndRestoreFrame(state, aTextContent, letterFrame, textFrame);
+
+ SetInitialSingleChild(letterFrame, textFrame);
+ aResult.Clear();
+ aResult.AppendFrame(nullptr, letterFrame);
+ NS_ASSERTION(!aBlockFrame->GetPrevContinuation(),
+ "should have the first continuation here");
+ aBlockFrame->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_CHILD);
+ }
+ MOZ_ASSERT(
+ !aBlockFrame->GetPrevContinuation(),
+ "Setting up a first-letter frame on a non-first block continuation?");
+ auto parent =
+ static_cast<nsContainerFrame*>(aParentFrame->FirstContinuation());
+ if (MOZ_UNLIKELY(parent->IsLineFrame())) {
+ parent = static_cast<nsContainerFrame*>(
+ parent->GetParent()->FirstContinuation());
+ }
+ parent->SetHasFirstLetterChild();
+ aBlockFrame->SetProperty(nsContainerFrame::FirstLetterProperty(),
+ letterFrame);
+ aTextContent->SetPrimaryFrame(textFrame);
+ }
+}
+
+void nsCSSFrameConstructor::WrapFramesInFirstLetterFrame(
+ nsContainerFrame* aBlockFrame, nsFrameList& aBlockFrames) {
+ aBlockFrame->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE);
+
+ nsContainerFrame* parentFrame = nullptr;
+ nsIFrame* textFrame = nullptr;
+ nsIFrame* prevFrame = nullptr;
+ nsFrameList letterFrames;
+ bool stopLooking = false;
+ WrapFramesInFirstLetterFrame(
+ aBlockFrame, aBlockFrame, aBlockFrame, aBlockFrames.FirstChild(),
+ &parentFrame, &textFrame, &prevFrame, letterFrames, &stopLooking);
+ if (parentFrame) {
+ if (parentFrame == aBlockFrame) {
+ // Take textFrame out of the block's frame list and substitute the
+ // letter frame(s) instead.
+ aBlockFrames.DestroyFrame(textFrame);
+ aBlockFrames.InsertFrames(nullptr, prevFrame, letterFrames);
+ } else {
+ // Take the old textFrame out of the inline parent's child list
+ RemoveFrame(kPrincipalList, textFrame);
+
+ // Insert in the letter frame(s)
+ parentFrame->InsertFrames(kPrincipalList, prevFrame, nullptr,
+ letterFrames);
+ }
+ }
+}
+
+void nsCSSFrameConstructor::WrapFramesInFirstLetterFrame(
+ nsContainerFrame* aBlockFrame, nsContainerFrame* aBlockContinuation,
+ nsContainerFrame* aParentFrame, nsIFrame* aParentFrameList,
+ nsContainerFrame** aModifiedParent, nsIFrame** aTextFrame,
+ nsIFrame** aPrevFrame, nsFrameList& aLetterFrames, bool* aStopLooking) {
+ nsIFrame* prevFrame = nullptr;
+ nsIFrame* frame = aParentFrameList;
+
+ // This loop attempts to implement "Finding the First Letter":
+ // https://drafts.csswg.org/css-pseudo-4/#application-in-css
+ // FIXME: we don't handle nested blocks correctly yet though (bug 214004)
+ while (frame) {
+ nsIFrame* nextFrame = frame->GetNextSibling();
+
+ // Skip all ::markers.
+ if (frame->Style()->GetPseudoType() == PseudoStyleType::marker) {
+ prevFrame = frame;
+ frame = nextFrame;
+ continue;
+ }
+ LayoutFrameType frameType = frame->Type();
+ if (LayoutFrameType::Text == frameType) {
+ // Wrap up first-letter content in a letter frame
+ Text* textContent = frame->GetContent()->AsText();
+ if (IsFirstLetterContent(textContent)) {
+ // Create letter frame to wrap up the text
+ CreateLetterFrame(aBlockFrame, aBlockContinuation, textContent,
+ aParentFrame, aLetterFrames);
+
+ // Provide adjustment information for parent
+ *aModifiedParent = aParentFrame;
+ *aTextFrame = frame;
+ *aPrevFrame = prevFrame;
+ *aStopLooking = true;
+ return;
+ }
+ } else if (IsInlineFrame(frame) && frameType != LayoutFrameType::Br) {
+ nsIFrame* kids = frame->PrincipalChildList().FirstChild();
+ WrapFramesInFirstLetterFrame(aBlockFrame, aBlockContinuation,
+ static_cast<nsContainerFrame*>(frame), kids,
+ aModifiedParent, aTextFrame, aPrevFrame,
+ aLetterFrames, aStopLooking);
+ if (*aStopLooking) {
+ return;
+ }
+ } else {
+ // This will stop us looking to create more letter frames. For
+ // example, maybe the frame-type is "letterFrame" or
+ // "placeholderFrame". This keeps us from creating extra letter
+ // frames, and also prevents us from creating letter frames when
+ // the first real content child of a block is not text (e.g. an
+ // image, hr, etc.)
+ *aStopLooking = true;
+ break;
+ }
+
+ prevFrame = frame;
+ frame = nextFrame;
+ }
+}
+
+static nsIFrame* FindFirstLetterFrame(nsIFrame* aFrame,
+ nsIFrame::ChildListID aListID) {
+ nsFrameList list = aFrame->GetChildList(aListID);
+ for (nsFrameList::Enumerator e(list); !e.AtEnd(); e.Next()) {
+ if (e.get()->IsLetterFrame()) {
+ return e.get();
+ }
+ }
+ return nullptr;
+}
+
+static void ClearHasFirstLetterChildFrom(nsContainerFrame* aParentFrame) {
+ MOZ_ASSERT(aParentFrame);
+ auto* parent =
+ static_cast<nsContainerFrame*>(aParentFrame->FirstContinuation());
+ if (MOZ_UNLIKELY(parent->IsLineFrame())) {
+ MOZ_ASSERT(!parent->HasFirstLetterChild());
+ parent = static_cast<nsContainerFrame*>(
+ parent->GetParent()->FirstContinuation());
+ }
+ MOZ_ASSERT(parent->HasFirstLetterChild());
+ parent->ClearHasFirstLetterChild();
+}
+
+void nsCSSFrameConstructor::RemoveFloatingFirstLetterFrames(
+ PresShell* aPresShell, nsIFrame* aBlockFrame) {
+ // Look for the first letter frame on the kFloatList, then kPushedFloatsList.
+ nsIFrame* floatFrame =
+ ::FindFirstLetterFrame(aBlockFrame, nsIFrame::kFloatList);
+ if (!floatFrame) {
+ floatFrame =
+ ::FindFirstLetterFrame(aBlockFrame, nsIFrame::kPushedFloatsList);
+ if (!floatFrame) {
+ return;
+ }
+ }
+
+ // Take the text frame away from the letter frame (so it isn't
+ // destroyed when we destroy the letter frame).
+ nsIFrame* textFrame = floatFrame->PrincipalChildList().FirstChild();
+ if (!textFrame) {
+ return;
+ }
+
+ // Discover the placeholder frame for the letter frame
+ nsPlaceholderFrame* placeholderFrame = floatFrame->GetPlaceholderFrame();
+ if (!placeholderFrame) {
+ // Somethings really wrong
+ return;
+ }
+ nsContainerFrame* parentFrame = placeholderFrame->GetParent();
+ if (!parentFrame) {
+ // Somethings really wrong
+ return;
+ }
+
+ ClearHasFirstLetterChildFrom(parentFrame);
+
+ // Create a new text frame with the right style that maps all of the content
+ // that was previously part of the letter frame (and probably continued
+ // elsewhere).
+ ComputedStyle* parentSC = parentFrame->Style();
+ nsIContent* textContent = textFrame->GetContent();
+ if (!textContent) {
+ return;
+ }
+ RefPtr<ComputedStyle> newSC =
+ aPresShell->StyleSet()->ResolveStyleForText(textContent, parentSC);
+ nsIFrame* newTextFrame = NS_NewTextFrame(aPresShell, newSC);
+ newTextFrame->Init(textContent, parentFrame, nullptr);
+
+ // Destroy the old text frame's continuations (the old text frame
+ // will be destroyed when its letter frame is destroyed).
+ nsIFrame* frameToDelete = textFrame->LastContinuation();
+ while (frameToDelete != textFrame) {
+ nsIFrame* nextFrameToDelete = frameToDelete->GetPrevContinuation();
+ RemoveFrame(kPrincipalList, frameToDelete);
+ frameToDelete = nextFrameToDelete;
+ }
+
+ nsIFrame* prevSibling = placeholderFrame->GetPrevSibling();
+
+ // Now that everything is set...
+#ifdef NOISY_FIRST_LETTER
+ printf(
+ "RemoveFloatingFirstLetterFrames: textContent=%p oldTextFrame=%p "
+ "newTextFrame=%p\n",
+ textContent.get(), textFrame, newTextFrame);
+#endif
+
+ // Remove placeholder frame and the float
+ RemoveFrame(kPrincipalList, placeholderFrame);
+
+ // Now that the old frames are gone, we can start pointing to our
+ // new primary frame.
+ textContent->SetPrimaryFrame(newTextFrame);
+
+ // Wallpaper bug 822910.
+ bool offsetsNeedFixing = prevSibling && prevSibling->IsTextFrame();
+ if (offsetsNeedFixing) {
+ prevSibling->AddStateBits(TEXT_OFFSETS_NEED_FIXING);
+ }
+
+ // Insert text frame in its place
+ nsFrameList textList(newTextFrame, newTextFrame);
+ InsertFrames(parentFrame, kPrincipalList, prevSibling, textList);
+
+ if (offsetsNeedFixing) {
+ prevSibling->RemoveStateBits(TEXT_OFFSETS_NEED_FIXING);
+ }
+}
+
+void nsCSSFrameConstructor::RemoveFirstLetterFrames(
+ PresShell* aPresShell, nsContainerFrame* aFrame,
+ nsContainerFrame* aBlockFrame, bool* aStopLooking) {
+ nsIFrame* prevSibling = nullptr;
+ nsIFrame* kid = aFrame->PrincipalChildList().FirstChild();
+
+ while (kid) {
+ if (kid->IsLetterFrame()) {
+ ClearHasFirstLetterChildFrom(aFrame);
+ nsIFrame* textFrame = kid->PrincipalChildList().FirstChild();
+ if (!textFrame) {
+ break;
+ }
+
+ // Create a new textframe
+ ComputedStyle* parentSC = aFrame->Style();
+ if (!parentSC) {
+ break;
+ }
+ nsIContent* textContent = textFrame->GetContent();
+ if (!textContent) {
+ break;
+ }
+ RefPtr<ComputedStyle> newSC =
+ aPresShell->StyleSet()->ResolveStyleForText(textContent, parentSC);
+ textFrame = NS_NewTextFrame(aPresShell, newSC);
+ textFrame->Init(textContent, aFrame, nullptr);
+
+ // Next rip out the kid and replace it with the text frame
+ RemoveFrame(kPrincipalList, kid);
+
+ // Now that the old frames are gone, we can start pointing to our
+ // new primary frame.
+ textContent->SetPrimaryFrame(textFrame);
+
+ // Wallpaper bug 822910.
+ bool offsetsNeedFixing = prevSibling && prevSibling->IsTextFrame();
+ if (offsetsNeedFixing) {
+ prevSibling->AddStateBits(TEXT_OFFSETS_NEED_FIXING);
+ }
+
+ // Insert text frame in its place
+ nsFrameList textList(textFrame, textFrame);
+ InsertFrames(aFrame, kPrincipalList, prevSibling, textList);
+
+ if (offsetsNeedFixing) {
+ prevSibling->RemoveStateBits(TEXT_OFFSETS_NEED_FIXING);
+ }
+
+ *aStopLooking = true;
+ NS_ASSERTION(!aBlockFrame->GetPrevContinuation(),
+ "should have the first continuation here");
+ aBlockFrame->RemoveStateBits(NS_BLOCK_HAS_FIRST_LETTER_CHILD);
+ break;
+ } else if (IsInlineFrame(kid)) {
+ nsContainerFrame* kidAsContainerFrame = do_QueryFrame(kid);
+ if (kidAsContainerFrame) {
+ // Look inside child inline frame for the letter frame.
+ RemoveFirstLetterFrames(aPresShell, kidAsContainerFrame, aBlockFrame,
+ aStopLooking);
+ if (*aStopLooking) {
+ break;
+ }
+ }
+ }
+ prevSibling = kid;
+ kid = kid->GetNextSibling();
+ }
+}
+
+void nsCSSFrameConstructor::RemoveLetterFrames(PresShell* aPresShell,
+ nsContainerFrame* aBlockFrame) {
+ aBlockFrame =
+ static_cast<nsContainerFrame*>(aBlockFrame->FirstContinuation());
+ aBlockFrame->RemoveProperty(nsContainerFrame::FirstLetterProperty());
+ nsContainerFrame* continuation = aBlockFrame;
+
+ bool stopLooking = false;
+ do {
+ RemoveFloatingFirstLetterFrames(aPresShell, continuation);
+ RemoveFirstLetterFrames(aPresShell, continuation, aBlockFrame,
+ &stopLooking);
+ if (stopLooking) {
+ break;
+ }
+ continuation =
+ static_cast<nsContainerFrame*>(continuation->GetNextContinuation());
+ } while (continuation);
+}
+
+// Fixup the letter frame situation for the given block
+void nsCSSFrameConstructor::RecoverLetterFrames(nsContainerFrame* aBlockFrame) {
+ aBlockFrame =
+ static_cast<nsContainerFrame*>(aBlockFrame->FirstContinuation());
+ nsContainerFrame* continuation = aBlockFrame;
+
+ nsContainerFrame* parentFrame = nullptr;
+ nsIFrame* textFrame = nullptr;
+ nsIFrame* prevFrame = nullptr;
+ nsFrameList letterFrames;
+ bool stopLooking = false;
+ do {
+ // XXX shouldn't this bit be set already (bug 408493), assert instead?
+ continuation->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE);
+ WrapFramesInFirstLetterFrame(
+ aBlockFrame, continuation, continuation,
+ continuation->PrincipalChildList().FirstChild(), &parentFrame,
+ &textFrame, &prevFrame, letterFrames, &stopLooking);
+ if (stopLooking) {
+ break;
+ }
+ continuation =
+ static_cast<nsContainerFrame*>(continuation->GetNextContinuation());
+ } while (continuation);
+
+ if (parentFrame) {
+ // Take the old textFrame out of the parent's child list
+ RemoveFrame(kPrincipalList, textFrame);
+
+ // Insert in the letter frame(s)
+ parentFrame->InsertFrames(kPrincipalList, prevFrame, nullptr, letterFrames);
+ }
+}
+
+//----------------------------------------------------------------------
+
+void nsCSSFrameConstructor::ConstructBlock(
+ nsFrameConstructorState& aState, nsIContent* aContent,
+ nsContainerFrame* aParentFrame, nsContainerFrame* aContentParentFrame,
+ ComputedStyle* aComputedStyle, nsContainerFrame** aNewFrame,
+ nsFrameList& aFrameList, nsIFrame* aPositionedFrameForAbsPosContainer) {
+ // clang-format off
+ //
+ // If a block frame is in a multi-column subtree, its children may need to
+ // be chopped into runs of blocks containing column-spans and runs of
+ // blocks containing no column-spans. Each run containing column-spans
+ // will be wrapped by an anonymous block. See CreateColumnSpanSiblings() for
+ // the implementation.
+ //
+ // If a block frame is a multi-column container, its children will need to
+ // be processed as above. Moreover, it creates a ColumnSetWrapperFrame as
+ // its outermost frame, and its children which have no
+ // -moz-column-span-wrapper pseudo will be wrapped in ColumnSetFrames. See
+ // FinishBuildingColumns() for the implementation.
+ //
+ // The multi-column subtree maintains the following invariants:
+ //
+ // 1) All the frames have the frame state bit
+ // NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR set, except for top-level
+ // ColumnSetWrapperFrame and those children in the column-span subtrees.
+ //
+ // 2) The first and last frame under ColumnSetWrapperFrame are always
+ // ColumnSetFrame.
+ //
+ // 3) ColumnSetFrames are linked together as continuations.
+ //
+ // 4) Those column-span wrappers are *not* linked together with themselves nor
+ // with the original block frame. The continuation chain consists of the
+ // original block frame and the original block's continuations wrapping
+ // non-column-spans.
+ //
+ // For example, this HTML
+ // <div id="x" style="column-count: 2;">
+ // <div style="column-span: all">a</div>
+ // <div id="y">
+ // b
+ // <div style="column-span: all">c</div>
+ // <div style="column-span: all">d</div>
+ // e
+ // </div>
+ // </div>
+ // <div style="column-span: all">f</div>
+ //
+ // yields the following frame tree.
+ //
+ // A) ColumnSetWrapper (original style)
+ // B) ColumnSet (-moz-column-set) <-- always created by BeginBuildingColumns
+ // C) Block (-moz-column-content)
+ // D) Block (-moz-column-span-wrapper, created by x)
+ // E) Block (div)
+ // F) Text ("a")
+ // G) ColumnSet (-moz-column-set)
+ // H) Block (-moz-column-content, created by x)
+ // I) Block (div, y)
+ // J) Text ("b")
+ // K) Block (-moz-column-span-wrapper, created by x)
+ // L) Block (-moz-column-span-wrapper, created by y)
+ // M) Block (div, new BFC)
+ // N) Text ("c")
+ // O) Block (div, new BFC)
+ // P) Text ("d")
+ // Q) ColumnSet (-moz-column-set)
+ // R) Block (-moz-column-content, created by x)
+ // S) Block (div, y)
+ // T) Text ("e")
+ // U) Block (div, new BFC) <-- not in multi-column hierarchy
+ // V) Text ("f")
+ //
+ // ColumnSet linkage described in 3): B -> G -> Q
+ //
+ // Block linkage described in 4): C -> H -> R and I -> S
+ //
+ // clang-format on
+
+ nsBlockFrame* blockFrame = do_QueryFrame(*aNewFrame);
+ MOZ_ASSERT(blockFrame &&
+ (blockFrame->IsBlockFrame() || blockFrame->IsDetailsFrame()),
+ "not a block frame nor a details frame?");
+
+ // Create column hierarchy if necessary.
+ const bool needsColumn =
+ aComputedStyle->StyleColumn()->IsColumnContainerStyle();
+ if (needsColumn) {
+ *aNewFrame = BeginBuildingColumns(aState, aContent, aParentFrame,
+ blockFrame, aComputedStyle);
+
+ if (aPositionedFrameForAbsPosContainer == blockFrame) {
+ aPositionedFrameForAbsPosContainer = *aNewFrame;
+ }
+ } else {
+ // No need to create column hierarchy. Initialize block frame.
+ blockFrame->SetComputedStyleWithoutNotification(aComputedStyle);
+ InitAndRestoreFrame(aState, aContent, aParentFrame, blockFrame);
+ }
+
+ aState.AddChild(*aNewFrame, aFrameList, aContent,
+ aContentParentFrame ? aContentParentFrame : aParentFrame);
+ if (!mRootElementFrame) {
+ // The frame we're constructing will be the root element frame.
+ SetRootElementFrameAndConstructCanvasAnonContent(*aNewFrame, aState,
+ aFrameList);
+ }
+
+ // We should make the outer frame be the absolute containing block,
+ // if one is required. We have to do this because absolute
+ // positioning must be computed with respect to the CSS dimensions
+ // of the element, which are the dimensions of the outer block. But
+ // we can't really do that because only blocks can have absolute
+ // children. So use the block and try to compensate with hacks
+ // in nsBlockFrame::CalculateContainingBlockSizeForAbsolutes.
+ nsFrameConstructorSaveState absoluteSaveState;
+ (*aNewFrame)->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ if (aPositionedFrameForAbsPosContainer) {
+ // NS_ASSERTION(aRelPos, "should have made area frame for this");
+ aState.PushAbsoluteContainingBlock(
+ *aNewFrame, aPositionedFrameForAbsPosContainer, absoluteSaveState);
+ }
+
+ if (aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) &&
+ !ShouldSuppressColumnSpanDescendants(aParentFrame)) {
+ blockFrame->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR);
+ }
+
+ // Process the child content
+ nsFrameList childList;
+ ProcessChildren(aState, aContent, aComputedStyle, blockFrame, true, childList,
+ true);
+
+ if (!MayNeedToCreateColumnSpanSiblings(blockFrame, childList)) {
+ // No need to create column-span siblings.
+ blockFrame->SetInitialChildList(kPrincipalList, childList);
+ return;
+ }
+
+ // Extract any initial non-column-span kids, and put them in block frame's
+ // child list.
+ nsFrameList initialNonColumnSpanKids =
+ childList.Split([](nsIFrame* f) { return f->IsColumnSpan(); });
+ blockFrame->SetInitialChildList(kPrincipalList, initialNonColumnSpanKids);
+
+ if (childList.IsEmpty()) {
+ // No more kids to process (there weren't any column-span kids).
+ return;
+ }
+
+ nsFrameList columnSpanSiblings = CreateColumnSpanSiblings(
+ aState, blockFrame, childList,
+ // If we're constructing a column container, pass nullptr as
+ // aPositionedFrame to forbid reparenting absolute/fixed positioned frames
+ // to column contents or column-span wrappers.
+ needsColumn ? nullptr : aPositionedFrameForAbsPosContainer);
+
+ if (needsColumn) {
+ // We're constructing a column container; need to finish building it.
+ FinishBuildingColumns(aState, *aNewFrame, blockFrame, columnSpanSiblings);
+ } else {
+ // We're constructing a normal block which has column-span children in a
+ // column hierarchy such as "x" in the following example.
+ //
+ // <div style="column-count: 2">
+ // <div id="x">
+ // <div>normal child</div>
+ // <div style="column-span">spanner</div>
+ // </div>
+ // </div>
+ aFrameList.AppendFrames(nullptr, columnSpanSiblings);
+ }
+
+ MOZ_ASSERT(columnSpanSiblings.IsEmpty(),
+ "The column-span siblings should be moved to the proper place!");
+}
+
+nsBlockFrame* nsCSSFrameConstructor::BeginBuildingColumns(
+ nsFrameConstructorState& aState, nsIContent* aContent,
+ nsContainerFrame* aParentFrame, nsContainerFrame* aColumnContent,
+ ComputedStyle* aComputedStyle) {
+ MOZ_ASSERT(
+ aColumnContent->IsBlockFrame() || aColumnContent->IsDetailsFrame(),
+ "aColumnContent should either be a block frame or a details frame.");
+ MOZ_ASSERT(aComputedStyle->StyleColumn()->IsColumnContainerStyle(),
+ "No need to build a column hierarchy!");
+
+ // The initial column hierarchy looks like this:
+ //
+ // ColumnSetWrapper (original style)
+ // ColumnSet (-moz-column-set)
+ // Block (-moz-column-content)
+ //
+ nsBlockFrame* columnSetWrapper = NS_NewColumnSetWrapperFrame(
+ mPresShell, aComputedStyle, nsFrameState(NS_FRAME_OWNS_ANON_BOXES));
+ InitAndRestoreFrame(aState, aContent, aParentFrame, columnSetWrapper);
+ if (aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) &&
+ !ShouldSuppressColumnSpanDescendants(aParentFrame)) {
+ columnSetWrapper->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR);
+ }
+
+ RefPtr<ComputedStyle> columnSetStyle =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::columnSet, aComputedStyle);
+ nsContainerFrame* columnSet = NS_NewColumnSetFrame(
+ mPresShell, columnSetStyle, nsFrameState(NS_FRAME_OWNS_ANON_BOXES));
+ InitAndRestoreFrame(aState, aContent, columnSetWrapper, columnSet);
+ columnSet->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR);
+
+ RefPtr<ComputedStyle> blockStyle =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::columnContent, columnSetStyle);
+ aColumnContent->SetComputedStyleWithoutNotification(blockStyle);
+ InitAndRestoreFrame(aState, aContent, columnSet, aColumnContent);
+ aColumnContent->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR |
+ NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS);
+
+ // Set up the parent-child chain.
+ SetInitialSingleChild(columnSetWrapper, columnSet);
+ SetInitialSingleChild(columnSet, aColumnContent);
+
+ return columnSetWrapper;
+}
+
+void nsCSSFrameConstructor::FinishBuildingColumns(
+ nsFrameConstructorState& aState, nsContainerFrame* aColumnSetWrapper,
+ nsContainerFrame* aColumnContent, nsFrameList& aColumnContentSiblings) {
+ nsContainerFrame* prevColumnSet = aColumnContent->GetParent();
+
+ MOZ_ASSERT(prevColumnSet->IsColumnSetFrame() &&
+ prevColumnSet->GetParent() == aColumnSetWrapper,
+ "Should have established column hierarchy!");
+
+ // Tag the first ColumnSet to have column-span siblings so that the bit can
+ // propagate to all the continuations. We don't want the last ColumnSet to
+ // have this bit, so we will unset the bit for it at the end of this function.
+ prevColumnSet->SetHasColumnSpanSiblings(true);
+
+ nsFrameList finalList;
+ while (aColumnContentSiblings.NotEmpty()) {
+ nsIFrame* f = aColumnContentSiblings.RemoveFirstChild();
+ if (f->IsColumnSpan()) {
+ // Do nothing for column-span wrappers. Just move it to the final
+ // items.
+ finalList.AppendFrame(aColumnSetWrapper, f);
+ } else {
+ auto* continuingColumnSet = static_cast<nsContainerFrame*>(
+ CreateContinuingFrame(prevColumnSet, aColumnSetWrapper, false));
+ MOZ_ASSERT(continuingColumnSet->HasColumnSpanSiblings(),
+ "The bit should propagate to the next continuation!");
+
+ f->SetParent(continuingColumnSet);
+ SetInitialSingleChild(continuingColumnSet, f);
+ finalList.AppendFrame(aColumnSetWrapper, continuingColumnSet);
+ prevColumnSet = continuingColumnSet;
+ }
+ }
+
+ // Unset the bit because the last ColumnSet has no column-span siblings.
+ prevColumnSet->SetHasColumnSpanSiblings(false);
+
+ aColumnSetWrapper->AppendFrames(kPrincipalList, finalList);
+}
+
+bool nsCSSFrameConstructor::MayNeedToCreateColumnSpanSiblings(
+ nsContainerFrame* aBlockFrame, const nsFrameList& aChildList) {
+ if (!aBlockFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) {
+ // The block frame isn't in a multi-column block formatting context.
+ return false;
+ }
+
+ if (ShouldSuppressColumnSpanDescendants(aBlockFrame)) {
+ // No need to create column-span siblings for a frame that suppresses them.
+ return false;
+ }
+
+ if (aChildList.IsEmpty()) {
+ // No child needs to be processed.
+ return false;
+ }
+
+ // Need to actually look into the child list.
+ return true;
+}
+
+nsFrameList nsCSSFrameConstructor::CreateColumnSpanSiblings(
+ nsFrameConstructorState& aState, nsContainerFrame* aInitialBlock,
+ nsFrameList& aChildList, nsIFrame* aPositionedFrame) {
+ MOZ_ASSERT(!aPositionedFrame || aPositionedFrame->IsAbsPosContainingBlock());
+
+ nsIContent* const content = aInitialBlock->GetContent();
+ nsContainerFrame* const parentFrame = aInitialBlock->GetParent();
+
+ nsFrameList siblings;
+ nsContainerFrame* lastNonColumnSpanWrapper = aInitialBlock;
+
+ // Tag the first non-column-span wrapper to have column-span siblings so that
+ // the bit can propagate to all the continuations. We don't want the last
+ // wrapper to have this bit, so we will unset the bit for it at the end of
+ // this function.
+ lastNonColumnSpanWrapper->SetHasColumnSpanSiblings(true);
+ do {
+ MOZ_ASSERT(aChildList.NotEmpty(), "Why call this if child list is empty?");
+ MOZ_ASSERT(aChildList.FirstChild()->IsColumnSpan(),
+ "Must have the child starting with column-span!");
+
+ // Grab the consecutive column-span kids, and reparent them into a
+ // block frame.
+ RefPtr<ComputedStyle> columnSpanWrapperStyle =
+ mPresShell->StyleSet()->ResolveNonInheritingAnonymousBoxStyle(
+ PseudoStyleType::columnSpanWrapper);
+ nsBlockFrame* columnSpanWrapper =
+ NS_NewBlockFrame(mPresShell, columnSpanWrapperStyle);
+ InitAndRestoreFrame(aState, content, parentFrame, columnSpanWrapper, false);
+ columnSpanWrapper->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR |
+ NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+
+ nsFrameList columnSpanKids =
+ aChildList.Split([](nsIFrame* f) { return !f->IsColumnSpan(); });
+ columnSpanKids.ApplySetParent(columnSpanWrapper);
+ columnSpanWrapper->SetInitialChildList(kPrincipalList, columnSpanKids);
+ if (aPositionedFrame) {
+ aState.ReparentAbsoluteItems(columnSpanWrapper);
+ }
+
+ siblings.AppendFrame(nullptr, columnSpanWrapper);
+
+ // Grab the consecutive non-column-span kids, and reparent them into a new
+ // continuation of the last non-column-span wrapper frame.
+ auto* nonColumnSpanWrapper = static_cast<nsContainerFrame*>(
+ CreateContinuingFrame(lastNonColumnSpanWrapper, parentFrame, false));
+ nonColumnSpanWrapper->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR |
+ NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ MOZ_ASSERT(nonColumnSpanWrapper->HasColumnSpanSiblings(),
+ "The bit should propagate to the next continuation!");
+
+ if (aChildList.NotEmpty()) {
+ nsFrameList nonColumnSpanKids =
+ aChildList.Split([](nsIFrame* f) { return f->IsColumnSpan(); });
+
+ nonColumnSpanKids.ApplySetParent(nonColumnSpanWrapper);
+ nonColumnSpanWrapper->SetInitialChildList(kPrincipalList,
+ nonColumnSpanKids);
+ if (aPositionedFrame) {
+ aState.ReparentAbsoluteItems(nonColumnSpanWrapper);
+ }
+ }
+
+ siblings.AppendFrame(nullptr, nonColumnSpanWrapper);
+
+ lastNonColumnSpanWrapper = nonColumnSpanWrapper;
+ } while (aChildList.NotEmpty());
+
+ // Unset the bit because the last non-column-span wrapper has no column-span
+ // siblings.
+ lastNonColumnSpanWrapper->SetHasColumnSpanSiblings(false);
+
+ return siblings;
+}
+
+bool nsCSSFrameConstructor::MaybeRecreateForColumnSpan(
+ nsFrameConstructorState& aState, nsContainerFrame* aParentFrame,
+ nsFrameList& aFrameList, nsIFrame* aPrevSibling) {
+ if (!aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) {
+ return false;
+ }
+
+ if (aFrameList.IsEmpty()) {
+ return false;
+ }
+
+ MOZ_ASSERT(!IsFramePartOfIBSplit(aParentFrame),
+ "We should have wiped aParentFrame in WipeContainingBlock if it's "
+ "part of IB split!");
+
+ nsIFrame* nextSibling = ::GetInsertNextSibling(aParentFrame, aPrevSibling);
+ if (!nextSibling && IsLastContinuationForColumnContent(aParentFrame)) {
+ // We are appending a list of frames to the last continuation of a
+ // ::-moz-column-content. This is the case where we can fix the frame tree
+ // instead of reframing the containing block. Return false and let
+ // AppendFramesToParent() deal with this.
+ return false;
+ }
+
+ auto HasColumnSpan = [](const nsFrameList& aList) {
+ for (nsIFrame* f : aList) {
+ if (f->IsColumnSpan()) {
+ return true;
+ }
+ }
+ return false;
+ };
+
+ if (HasColumnSpan(aFrameList)) {
+ // If any frame in the frame list has "column-span:all" style, i.e. a
+ // -moz-column-span-wrapper frame, we need to reframe the multi-column
+ // containing block.
+ //
+ // We can only be here if none of the new inserted nsIContent* nodes (via
+ // ContentAppended or ContentRangeInserted) have column-span:all style, yet
+ // some of them have column-span:all descendants. Sadly, there's no way to
+ // detect this by checking FrameConstructionItems in WipeContainingBlock().
+ // Otherwise, we would have already wiped the multi-column containing block.
+ PROFILER_MARKER("Reframe multi-column after constructing frame list",
+ LAYOUT, {}, Tracing, "Layout");
+
+ // aFrameList can contain placeholder frames. In order to destroy their
+ // associated out-of-flow frames properly, we need to manually flush all the
+ // out-of-flow frames in aState to their container frames.
+ aState.ProcessFrameInsertionsForAllLists();
+ aFrameList.DestroyFrames();
+ RecreateFramesForContent(
+ GetMultiColumnContainingBlockFor(aParentFrame)->GetContent(),
+ InsertionKind::Async);
+ return true;
+ }
+
+ return false;
+}
+
+nsIFrame* nsCSSFrameConstructor::ConstructInline(
+ nsFrameConstructorState& aState, FrameConstructionItem& aItem,
+ nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay,
+ nsFrameList& aFrameList) {
+ // If an inline frame has non-inline kids, then we chop up the child list
+ // into runs of blocks and runs of inlines, create anonymous block frames to
+ // contain the runs of blocks, inline frames with our style for the runs of
+ // inlines, and put all these frames, in order, into aFrameList.
+ //
+ // When there are column-span blocks in a run of blocks, instead of creating
+ // an anonymous block to wrap them, we create multiple anonymous blocks,
+ // wrapping runs of non-column-spans and runs of column-spans.
+ //
+ // We return the the first one. The whole setup is called an {ib}
+ // split; in what follows "frames in the split" refers to the anonymous blocks
+ // and inlines that contain our children.
+ //
+ // {ib} splits maintain the following invariants:
+ // 1) All frames in the split have the NS_FRAME_PART_OF_IBSPLIT bit
+ // set.
+ //
+ // 2) Each frame in the split has the nsIFrame::IBSplitSibling
+ // property pointing to the next frame in the split, except for the last
+ // one, which does not have it set.
+ //
+ // 3) Each frame in the split has the nsIFrame::IBSplitPrevSibling
+ // property pointing to the previous frame in the split, except for the
+ // first one, which does not have it set.
+ //
+ // 4) The first and last frame in the split are always inlines.
+ //
+ // 5) The frames wrapping runs of non-column-spans are linked together as
+ // continuations. The frames wrapping runs of column-spans are *not*
+ // linked with each other nor with other non-column-span wrappers.
+ //
+ // 6) The first and last frame in the chains of blocks are always wrapping
+ // non-column-spans. Both of them are created even if they're empty.
+ //
+ // An invariant that is NOT maintained is that the wrappers are actually
+ // linked via GetNextSibling linkage. A simple example is an inline
+ // containing an inline that contains a block. The three parts of the inner
+ // inline end up with three different parents.
+ //
+ // For example, this HTML:
+ // <span>
+ // <div>a</div>
+ // <span>
+ // b
+ // <div>c</div>
+ // </span>
+ // d
+ // <div>e</div>
+ // f
+ // </span>
+ // Gives the following frame tree:
+ //
+ // Inline (outer span)
+ // Block (anonymous, outer span)
+ // Block (div)
+ // Text("a")
+ // Inline (outer span)
+ // Inline (inner span)
+ // Text("b")
+ // Block (anonymous, outer span)
+ // Block (anonymous, inner span)
+ // Block (div)
+ // Text("c")
+ // Inline (outer span)
+ // Inline (inner span)
+ // Text("d")
+ // Block (anonymous, outer span)
+ // Block (div)
+ // Text("e")
+ // Inline (outer span)
+ // Text("f")
+
+ nsIContent* const content = aItem.mContent;
+ ComputedStyle* const computedStyle = aItem.mComputedStyle;
+
+ nsInlineFrame* newFrame = NS_NewInlineFrame(mPresShell, computedStyle);
+
+ // Initialize the frame
+ InitAndRestoreFrame(aState, content, aParentFrame, newFrame);
+
+ // definition cannot be inside next block because the object's destructor is
+ // significant. this is part of the fix for bug 42372
+ nsFrameConstructorSaveState absoluteSaveState;
+
+ bool isAbsPosCB = newFrame->IsAbsPosContainingBlock();
+ newFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ if (isAbsPosCB) {
+ // Relatively positioned frames becomes a container for child
+ // frames that are positioned
+ aState.PushAbsoluteContainingBlock(newFrame, newFrame, absoluteSaveState);
+ }
+
+ if (aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) &&
+ !ShouldSuppressColumnSpanDescendants(aParentFrame)) {
+ newFrame->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR);
+ }
+
+ // Process the child content
+ nsFrameList childList;
+ ConstructFramesFromItemList(aState, aItem.mChildItems, newFrame,
+ /* aParentIsWrapperAnonBox = */ false, childList);
+
+ nsFrameList::FrameLinkEnumerator firstBlockEnumerator(childList);
+ if (!aItem.mIsAllInline) {
+ firstBlockEnumerator.Find(
+ [](nsIFrame* aFrame) { return aFrame->IsBlockOutside(); });
+ }
+
+ if (aItem.mIsAllInline || firstBlockEnumerator.AtEnd()) {
+ // This part is easy. We either already know we have no non-inline kids,
+ // or haven't found any when constructing actual frames (the latter can
+ // happen only if out-of-flows that we thought had no containing block
+ // acquired one when ancestor inline frames and {ib} splits got
+ // constructed). Just put all the kids into the single inline frame and
+ // bail.
+ newFrame->SetInitialChildList(kPrincipalList, childList);
+ aState.AddChild(newFrame, aFrameList, content, aParentFrame);
+ return newFrame;
+ }
+
+ // This inline frame contains several types of children. Therefore this frame
+ // has to be chopped into several pieces, as described above.
+
+ // Grab the first inline's kids
+ nsFrameList firstInlineKids = childList.ExtractHead(firstBlockEnumerator);
+ newFrame->SetInitialChildList(kPrincipalList, firstInlineKids);
+
+ aFrameList.AppendFrame(nullptr, newFrame);
+
+ newFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES);
+ CreateIBSiblings(aState, newFrame, isAbsPosCB, childList, aFrameList);
+
+ return newFrame;
+}
+
+void nsCSSFrameConstructor::CreateIBSiblings(nsFrameConstructorState& aState,
+ nsContainerFrame* aInitialInline,
+ bool aIsAbsPosCB,
+ nsFrameList& aChildList,
+ nsFrameList& aSiblings) {
+ MOZ_ASSERT(aIsAbsPosCB == aInitialInline->IsAbsPosContainingBlock());
+
+ nsIContent* content = aInitialInline->GetContent();
+ ComputedStyle* computedStyle = aInitialInline->Style();
+ nsContainerFrame* parentFrame = aInitialInline->GetParent();
+
+ // Resolve the right style for our anonymous blocks.
+ //
+ // The distinction in styles is needed because of CSS 2.1, section
+ // 9.2.1.1, which says:
+ //
+ // When such an inline box is affected by relative positioning, any
+ // resulting translation also affects the block-level box contained
+ // in the inline box.
+ RefPtr<ComputedStyle> blockSC =
+ mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType::mozBlockInsideInlineWrapper, computedStyle);
+
+ nsContainerFrame* lastNewInline =
+ static_cast<nsContainerFrame*>(aInitialInline->FirstContinuation());
+ do {
+ // On entry to this loop aChildList is not empty and the first frame in it
+ // is block-level.
+ MOZ_ASSERT(aChildList.NotEmpty(), "Should have child items");
+ MOZ_ASSERT(aChildList.FirstChild()->IsBlockOutside(),
+ "Must have list starting with block");
+
+ // The initial run of blocks belongs to an anonymous block that we create
+ // right now. The anonymous block will be the parent of these block
+ // children of the inline.
+ nsBlockFrame* blockFrame = NS_NewBlockFrame(mPresShell, blockSC);
+ InitAndRestoreFrame(aState, content, parentFrame, blockFrame, false);
+ if (aInitialInline->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) {
+ blockFrame->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR);
+ }
+
+ // Find the first non-block child which defines the end of our block kids
+ // and the start of our next inline's kids
+ nsFrameList blockKids =
+ aChildList.Split([](nsIFrame* f) { return !f->IsBlockOutside(); });
+
+ if (!aInitialInline->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) {
+ MoveChildrenTo(aInitialInline, blockFrame, blockKids);
+
+ SetFrameIsIBSplit(lastNewInline, blockFrame);
+ aSiblings.AppendFrame(nullptr, blockFrame);
+ } else {
+ // Extract any initial non-column-span frames, and put them in
+ // blockFrame's child list.
+ nsFrameList initialNonColumnSpanKids =
+ blockKids.Split([](nsIFrame* f) { return f->IsColumnSpan(); });
+ MoveChildrenTo(aInitialInline, blockFrame, initialNonColumnSpanKids);
+
+ SetFrameIsIBSplit(lastNewInline, blockFrame);
+ aSiblings.AppendFrame(nullptr, blockFrame);
+
+ if (blockKids.NotEmpty()) {
+ // Although SetFrameIsIBSplit() will add NS_FRAME_PART_OF_IBSPLIT for
+ // blockFrame later, we manually add the bit earlier here to make all
+ // the continuations of blockFrame created in
+ // CreateColumnSpanSiblings(), i.e. non-column-span wrappers, have the
+ // bit via nsIFrame::Init().
+ blockFrame->AddStateBits(NS_FRAME_PART_OF_IBSPLIT);
+
+ nsFrameList columnSpanSiblings =
+ CreateColumnSpanSiblings(aState, blockFrame, blockKids,
+ aIsAbsPosCB ? aInitialInline : nullptr);
+ aSiblings.AppendFrames(nullptr, columnSpanSiblings);
+ }
+ }
+
+ // Now grab the initial inlines in aChildList and put them into an inline
+ // frame.
+ nsInlineFrame* inlineFrame = NS_NewInlineFrame(mPresShell, computedStyle);
+ InitAndRestoreFrame(aState, content, parentFrame, inlineFrame, false);
+ inlineFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
+ if (aInitialInline->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) {
+ inlineFrame->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR);
+ }
+
+ if (aIsAbsPosCB) {
+ inlineFrame->MarkAsAbsoluteContainingBlock();
+ }
+
+ if (aChildList.NotEmpty()) {
+ nsFrameList inlineKids =
+ aChildList.Split([](nsIFrame* f) { return f->IsBlockOutside(); });
+ MoveChildrenTo(aInitialInline, inlineFrame, inlineKids);
+ }
+
+ SetFrameIsIBSplit(blockFrame, inlineFrame);
+ aSiblings.AppendFrame(nullptr, inlineFrame);
+ lastNewInline = inlineFrame;
+ } while (aChildList.NotEmpty());
+
+ SetFrameIsIBSplit(lastNewInline, nullptr);
+}
+
+void nsCSSFrameConstructor::BuildInlineChildItems(
+ nsFrameConstructorState& aState, FrameConstructionItem& aParentItem,
+ bool aItemIsWithinSVGText, bool aItemAllowsTextPathChild) {
+ ComputedStyle* const parentComputedStyle = aParentItem.mComputedStyle;
+ nsIContent* const parentContent = aParentItem.mContent;
+
+ if (!aItemIsWithinSVGText) {
+ if (parentComputedStyle->StyleDisplay()->IsListItem()) {
+ CreateGeneratedContentItem(aState, nullptr, *parentContent->AsElement(),
+ *parentComputedStyle, PseudoStyleType::marker,
+ aParentItem.mChildItems);
+ }
+ // Probe for generated content before
+ CreateGeneratedContentItem(aState, nullptr, *parentContent->AsElement(),
+ *parentComputedStyle, PseudoStyleType::before,
+ aParentItem.mChildItems);
+ }
+
+ ItemFlags flags;
+ if (aItemIsWithinSVGText) {
+ flags += ItemFlag::IsWithinSVGText;
+ }
+ if (aItemAllowsTextPathChild &&
+ aParentItem.mContent->IsSVGElement(nsGkAtoms::a)) {
+ flags += ItemFlag::AllowTextPathChild;
+ }
+
+ FlattenedChildIterator iter(parentContent);
+ for (nsIContent* content = iter.GetNextChild(); content;
+ content = iter.GetNextChild()) {
+ AddFrameConstructionItems(aState, content, iter.ShadowDOMInvolved(),
+ InsertionPoint(), aParentItem.mChildItems, flags);
+ }
+
+ if (!aItemIsWithinSVGText) {
+ // Probe for generated content after
+ CreateGeneratedContentItem(aState, nullptr, *parentContent->AsElement(),
+ *parentComputedStyle, PseudoStyleType::after,
+ aParentItem.mChildItems);
+ }
+
+ aParentItem.mIsAllInline = aParentItem.mChildItems.AreAllItemsInline();
+}
+
+// return whether it's ok to append (in the AppendFrames sense) to
+// aParentFrame if our nextSibling is aNextSibling. aParentFrame must
+// be an ib-split inline.
+static bool IsSafeToAppendToIBSplitInline(nsIFrame* aParentFrame,
+ nsIFrame* aNextSibling) {
+ MOZ_ASSERT(IsInlineFrame(aParentFrame), "Must have an inline parent here");
+
+ do {
+ NS_ASSERTION(IsFramePartOfIBSplit(aParentFrame),
+ "How is this not part of an ib-split?");
+ if (aNextSibling || aParentFrame->GetNextContinuation() ||
+ GetIBSplitSibling(aParentFrame)) {
+ return false;
+ }
+
+ aNextSibling = aParentFrame->GetNextSibling();
+ aParentFrame = aParentFrame->GetParent();
+ } while (IsInlineFrame(aParentFrame));
+
+ return true;
+}
+
+bool nsCSSFrameConstructor::WipeInsertionParent(nsContainerFrame* aFrame) {
+#define TRACE(reason) \
+ PROFILER_MARKER("WipeInsertionParent: " reason, LAYOUT, {}, Tracing, \
+ "Layout");
+
+ const LayoutFrameType frameType = aFrame->Type();
+
+ // FIXME(emilio): This looks terribly inefficient if you insert elements deep
+ // in a MathML subtree.
+ if (aFrame->IsFrameOfType(nsIFrame::eMathML)) {
+ TRACE("MathML");
+ RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async);
+ return true;
+ }
+
+ // A ruby-related frame that's getting new children.
+ // The situation for ruby is complex, especially when interacting with
+ // spaces. It contains these two special cases apart from tables:
+ // 1) There are effectively three types of white spaces in ruby frames
+ // we handle differently: leading/tailing/inter-level space,
+ // inter-base/inter-annotation space, and inter-segment space.
+ // These three types of spaces can be converted to each other when
+ // their sibling changes.
+ // 2) The first effective child of a ruby frame must always be a ruby
+ // base container. It should be created or destroyed accordingly.
+ if (IsRubyPseudo(aFrame) || frameType == LayoutFrameType::Ruby ||
+ RubyUtils::IsRubyContainerBox(frameType)) {
+ // We want to optimize it better, and avoid reframing as much as
+ // possible. But given the cases above, and the fact that a ruby
+ // usually won't be very large, it should be fine to reframe it.
+ TRACE("Ruby");
+ RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async);
+ return true;
+ }
+
+ // A <details> that's getting new children. When inserting
+ // elements into <details>, we reframe the <details> and let frame constructor
+ // move the main <summary> to the front when constructing the frame
+ // construction items.
+ if (auto* details =
+ HTMLDetailsElement::FromNodeOrNull(aFrame->GetContent())) {
+ TRACE("Details / Summary");
+ RecreateFramesForContent(details, InsertionKind::Async);
+ return true;
+ }
+
+ // Reframe the multi-column container whenever elements insert/append
+ // into it because we need to reconstruct column-span split.
+ if (aFrame->IsColumnSetWrapperFrame()) {
+ TRACE("Multi-column");
+ RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async);
+ return true;
+ }
+
+ return false;
+
+#undef TRACE
+}
+
+bool nsCSSFrameConstructor::WipeContainingBlock(
+ nsFrameConstructorState& aState, nsIFrame* aContainingBlock,
+ nsIFrame* aFrame, FrameConstructionItemList& aItems, bool aIsAppend,
+ nsIFrame* aPrevSibling) {
+#define TRACE(reason) \
+ PROFILER_MARKER("WipeContainingBlock: " reason, LAYOUT, {}, Tracing, \
+ "Layout");
+
+ if (aItems.IsEmpty()) {
+ return false;
+ }
+
+ // Before we go and append the frames, we must check for several
+ // special situations.
+
+ if (aFrame->GetContent() == mDocument->GetRootElement()) {
+ // If we insert a content that becomes the canonical body element, and its
+ // used WritingMode is different from the root element's used WritingMode,
+ // we need to reframe the root element so that the root element's frames has
+ // the correct writing-mode propagated from body element. (See
+ // nsCSSFrameConstructor::ConstructDocElementFrame.)
+ //
+ // Bug 1594297: When inserting a new <body>, we may need to reframe the old
+ // <body> which has a "overflow" value other than simple "visible". But it's
+ // tricky, see bug 1593752.
+ nsIContent* bodyElement = mDocument->GetBodyElement();
+ for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) {
+ const WritingMode bodyWM(iter.item().mComputedStyle);
+ if (iter.item().mContent == bodyElement &&
+ bodyWM != aFrame->GetWritingMode()) {
+ TRACE("Root");
+ RecreateFramesForContent(mDocument->GetRootElement(),
+ InsertionKind::Async);
+ return true;
+ }
+ }
+ }
+
+ // Situation #1 is a XUL frame that contains frames that are required
+ // to be wrapped in blocks.
+ if (aFrame->IsXULBoxFrame() &&
+ !aFrame->HasAnyStateBits(NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK) &&
+ aItems.AnyItemsNeedBlockParent()) {
+ TRACE("XUL with block-wrapped kids");
+ RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async);
+ return true;
+ }
+
+ nsIFrame* nextSibling = ::GetInsertNextSibling(aFrame, aPrevSibling);
+
+ // Situation #2 is a flex or grid container frame into which we're inserting
+ // new inline non-replaced children, adjacent to an existing anonymous
+ // flex or grid item.
+ LayoutFrameType frameType = aFrame->Type();
+ if (frameType == LayoutFrameType::FlexContainer ||
+ frameType == LayoutFrameType::GridContainer) {
+ FCItemIterator iter(aItems);
+
+ // Check if we're adding to-be-wrapped content right *after* an existing
+ // anonymous flex or grid item (which would need to absorb this content).
+ const bool isLegacyBox = IsFlexContainerForLegacyBox(aFrame);
+ if (aPrevSibling && IsAnonymousFlexOrGridItem(aPrevSibling) &&
+ iter.item().NeedsAnonFlexOrGridItem(aState, isLegacyBox)) {
+ TRACE("Inserting inline after anon flex or grid item");
+ RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async);
+ return true;
+ }
+
+ // Check if we're adding to-be-wrapped content right *before* an existing
+ // anonymous flex or grid item (which would need to absorb this content).
+ if (nextSibling && IsAnonymousFlexOrGridItem(nextSibling)) {
+ // Jump to the last entry in the list
+ iter.SetToEnd();
+ iter.Prev();
+ if (iter.item().NeedsAnonFlexOrGridItem(aState, isLegacyBox)) {
+ TRACE("Inserting inline before anon flex or grid item");
+ RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async);
+ return true;
+ }
+ }
+ }
+
+ // Situation #3 is an anonymous flex or grid item that's getting new children
+ // who don't want to be wrapped.
+ if (IsAnonymousFlexOrGridItem(aFrame)) {
+ AssertAnonymousFlexOrGridItemParent(aFrame, aFrame->GetParent());
+
+ // We need to push a null float containing block to be sure that
+ // "NeedsAnonFlexOrGridItem" will know we're not honoring floats for this
+ // inserted content. (In particular, this is necessary in order for
+ // its "GetGeometricParent" call to return the correct result.)
+ // We're not honoring floats on this content because it has the
+ // _flex/grid container_ as its parent in the content tree.
+ nsFrameConstructorSaveState floatSaveState;
+ aState.PushFloatContainingBlock(nullptr, floatSaveState);
+
+ FCItemIterator iter(aItems);
+ // Skip over things that _do_ need an anonymous flex item, because
+ // they're perfectly happy to go here -- they won't cause a reframe.
+ nsIFrame* containerFrame = aFrame->GetParent();
+ const bool isLegacyBox = IsFlexContainerForLegacyBox(containerFrame);
+ if (!iter.SkipItemsThatNeedAnonFlexOrGridItem(aState, isLegacyBox)) {
+ // We hit something that _doesn't_ need an anonymous flex item!
+ // Rebuild the flex container to bust it out.
+ TRACE("Inserting non-inlines inside anon flex or grid item");
+ RecreateFramesForContent(containerFrame->GetContent(),
+ InsertionKind::Async);
+ return true;
+ }
+
+ // If we get here, then everything in |aItems| needs to be wrapped in
+ // an anonymous flex or grid item. That's where it's already going - good!
+ }
+
+ // Situation #4 is a case when table pseudo-frames don't work out right
+ ParentType parentType = GetParentType(aFrame);
+ // If all the kids want a parent of the type that aFrame is, then we're all
+ // set to go. Indeed, there won't be any table pseudo-frames created between
+ // aFrame and the kids, so those won't need to be merged with any table
+ // pseudo-frames that might already be kids of aFrame. If aFrame itself is a
+ // table pseudo-frame, then all the kids in this list would have wanted a
+ // frame of that type wrapping them anyway, so putting them inside it is ok.
+ if (!aItems.AllWantParentType(parentType)) {
+ // Don't give up yet. If parentType is not eTypeBlock and the parent is
+ // not a generated content frame, then try filtering whitespace out of the
+ // list.
+ if (parentType != eTypeBlock && !aFrame->IsGeneratedContentFrame()) {
+ // For leading whitespace followed by a kid that wants our parent type,
+ // there are four cases:
+ // 1) We have a previous sibling which is not a table pseudo. That means
+ // that previous sibling wanted a (non-block) parent of the type we're
+ // looking at. Then the whitespace comes between two table-internal
+ // elements, so should be collapsed out.
+ // 2) We have a previous sibling which is a table pseudo. It might have
+ // kids who want this whitespace, so we need to reframe.
+ // 3) We have no previous sibling and our parent frame is not a table
+ // pseudo. That means that we'll be at the beginning of our actual
+ // non-block-type parent, and the whitespace is OK to collapse out.
+ // If something is ever inserted before us, it'll find our own parent
+ // as its parent and if it's something that would care about the
+ // whitespace it'll want a block parent, so it'll trigger a reframe at
+ // that point.
+ // 4) We have no previous sibling and our parent frame is a table pseudo.
+ // Need to reframe.
+ // All that is predicated on finding the correct previous sibling. We
+ // might have to walk backwards along continuations from aFrame to do so.
+ //
+ // It's always OK to drop whitespace between any two items that want a
+ // parent of type parentType.
+ //
+ // For trailing whitespace preceded by a kid that wants our parent type,
+ // there are four cases:
+ // 1) We have a next sibling which is not a table pseudo. That means
+ // that next sibling wanted a (non-block) parent of the type we're
+ // looking at. Then the whitespace comes between two table-internal
+ // elements, so should be collapsed out.
+ // 2) We have a next sibling which is a table pseudo. It might have
+ // kids who want this whitespace, so we need to reframe.
+ // 3) We have no next sibling and our parent frame is not a table
+ // pseudo. That means that we'll be at the end of our actual
+ // non-block-type parent, and the whitespace is OK to collapse out.
+ // If something is ever inserted after us, it'll find our own parent
+ // as its parent and if it's something that would care about the
+ // whitespace it'll want a block parent, so it'll trigger a reframe at
+ // that point.
+ // 4) We have no next sibling and our parent frame is a table pseudo.
+ // Need to reframe.
+ // All that is predicated on finding the correct next sibling. We might
+ // have to walk forward along continuations from aFrame to do so. That
+ // said, in the case when nextSibling is null at this point and aIsAppend
+ // is true, we know we're in case 3. Furthermore, in that case we don't
+ // even have to worry about the table pseudo situation; we know our
+ // parent is not a table pseudo there.
+ FCItemIterator iter(aItems);
+ FCItemIterator start(iter);
+ do {
+ if (iter.SkipItemsWantingParentType(parentType)) {
+ break;
+ }
+
+ // iter points to an item that wants a different parent. If it's not
+ // whitespace, we're done; no more point scanning the list.
+ if (!iter.item().IsWhitespace(aState)) {
+ break;
+ }
+
+ if (iter == start) {
+ // Leading whitespace. How to handle this depends on our
+ // previous sibling and aFrame. See the long comment above.
+ nsIFrame* prevSibling = aPrevSibling;
+ if (!prevSibling) {
+ // Try to find one after all
+ nsIFrame* parentPrevCont = aFrame->GetPrevContinuation();
+ while (parentPrevCont) {
+ prevSibling =
+ parentPrevCont->GetChildList(kPrincipalList).LastChild();
+ if (prevSibling) {
+ break;
+ }
+ parentPrevCont = parentPrevCont->GetPrevContinuation();
+ }
+ };
+ if (prevSibling) {
+ if (IsTablePseudo(prevSibling)) {
+ // need to reframe
+ break;
+ }
+ } else if (IsTablePseudo(aFrame)) {
+ // need to reframe
+ break;
+ }
+ }
+
+ FCItemIterator spaceEndIter(iter);
+ // Advance spaceEndIter past any whitespace
+ bool trailingSpaces = spaceEndIter.SkipWhitespace(aState);
+
+ bool okToDrop;
+ if (trailingSpaces) {
+ // Trailing whitespace. How to handle this depeds on aIsAppend, our
+ // next sibling and aFrame. See the long comment above.
+ okToDrop = aIsAppend && !nextSibling;
+ if (!okToDrop) {
+ if (!nextSibling) {
+ // Try to find one after all
+ nsIFrame* parentNextCont = aFrame->GetNextContinuation();
+ while (parentNextCont) {
+ nextSibling = parentNextCont->PrincipalChildList().FirstChild();
+ if (nextSibling) {
+ break;
+ }
+ parentNextCont = parentNextCont->GetNextContinuation();
+ }
+ }
+
+ okToDrop = (nextSibling && !IsTablePseudo(nextSibling)) ||
+ (!nextSibling && !IsTablePseudo(aFrame));
+ }
+#ifdef DEBUG
+ else {
+ NS_ASSERTION(!IsTablePseudo(aFrame), "How did that happen?");
+ }
+#endif
+ } else {
+ okToDrop = (spaceEndIter.item().DesiredParentType() == parentType);
+ }
+
+ if (okToDrop) {
+ iter.DeleteItemsTo(this, spaceEndIter);
+ } else {
+ // We're done: we don't want to drop the whitespace, and it has the
+ // wrong parent type.
+ break;
+ }
+
+ // Now loop, since |iter| points to item right after the whitespace we
+ // removed.
+ } while (!iter.IsDone());
+ }
+
+ // We might be able to figure out some sort of optimizations here, but they
+ // would have to depend on having a correct aPrevSibling and a correct next
+ // sibling. For example, we can probably avoid reframing if none of
+ // aFrame, aPrevSibling, and next sibling are table pseudo-frames. But it
+ // doesn't seem worth it to worry about that for now, especially since we
+ // in fact do not have a reliable aPrevSibling, nor any next sibling, in
+ // this method.
+
+ // aItems might have changed, so recheck the parent type thing. In fact,
+ // it might be empty, so recheck that too.
+ if (aItems.IsEmpty()) {
+ return false;
+ }
+
+ if (!aItems.AllWantParentType(parentType)) {
+ // Reframing aFrame->GetContent() is good enough, since the content of
+ // table pseudo-frames is the ancestor content.
+ TRACE("Pseudo-frames going wrong");
+ RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async);
+ return true;
+ }
+ }
+
+ // Situation #5 is a frame in multicol subtree that's getting new children.
+ if (aFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) {
+ MOZ_ASSERT(!aFrame->IsDetailsFrame(),
+ "Inserting elements into <details> should have been reframed!");
+
+ bool anyColumnSpanItems = false;
+ for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) {
+ if (iter.item().mComputedStyle->StyleColumn()->IsColumnSpanStyle()) {
+ anyColumnSpanItems = true;
+ break;
+ }
+ }
+
+ bool needsReframe =
+ // 1. Insert / append any column-span children.
+ anyColumnSpanItems ||
+ // 2. GetInsertionPrevSibling() modifies insertion parent. If the prev
+ // sibling is a column-span, aFrame ends up being the
+ // column-span-wrapper.
+ aFrame->Style()->GetPseudoType() ==
+ PseudoStyleType::columnSpanWrapper ||
+ // 3. Append into {ib} split container. There might be room for
+ // optimization, but let's reframe for correctness...
+ IsFramePartOfIBSplit(aFrame);
+
+ if (needsReframe) {
+ TRACE("Multi-column");
+ RecreateFramesForContent(
+ GetMultiColumnContainingBlockFor(aFrame)->GetContent(),
+ InsertionKind::Async);
+ return true;
+ }
+
+ // If we get here, then we need further check for {ib} split to decide
+ // whether to reframe. For example, appending a block into an empty inline
+ // that is not part of an {ib} split, but should become an {ib} split.
+ }
+
+ // Now we have several cases involving {ib} splits. Put them all in a
+ // do/while with breaks to take us to the "go and reconstruct" code.
+ do {
+ if (IsInlineFrame(aFrame)) {
+ if (aItems.AreAllItemsInline()) {
+ // We can just put the kids in.
+ return false;
+ }
+
+ if (!IsFramePartOfIBSplit(aFrame)) {
+ // Need to go ahead and reconstruct.
+ break;
+ }
+
+ // Now we're adding kids including some blocks to an inline part of an
+ // {ib} split. If we plan to call AppendFrames, and don't have a next
+ // sibling for the new frames, and our parent is the last continuation of
+ // the last part of the {ib} split, and the same is true of all our
+ // ancestor inlines (they have no following continuations and they're the
+ // last part of their {ib} splits and we'd be adding to the end for all
+ // of them), then AppendFrames will handle things for us. Bail out in
+ // that case.
+ if (aIsAppend && IsSafeToAppendToIBSplitInline(aFrame, nextSibling)) {
+ return false;
+ }
+
+ // Need to reconstruct.
+ break;
+ }
+
+ // Now we know we have a block parent. If it's not part of an
+ // ib-split, we're all set.
+ if (!IsFramePartOfIBSplit(aFrame)) {
+ return false;
+ }
+
+ // We're adding some kids to a block part of an {ib} split. If all the
+ // kids are blocks, we don't need to reconstruct.
+ if (aItems.AreAllItemsBlock()) {
+ return false;
+ }
+
+ // We might have some inline kids for this block. Just fall out of the
+ // loop and reconstruct.
+ } while (0);
+
+ // If we don't have a containing block, start with aFrame and look for one.
+ if (!aContainingBlock) {
+ aContainingBlock = aFrame;
+ }
+
+ // To find the right block to reframe, just walk up the tree until we find a
+ // frame that is:
+ // 1) Not part of an IB split
+ // 2) Not a pseudo-frame
+ // 3) Not an inline frame
+ // We're guaranteed to find one, since ComputedStyle::ApplyStyleFixups
+ // enforces that the root is display:none, display:table, or display:block.
+ // Note that walking up "too far" is OK in terms of correctness, even if it
+ // might be a little inefficient. This is why we walk out of all
+ // pseudo-frames -- telling which ones are or are not OK to walk out of is
+ // too hard (and I suspect that we do in fact need to walk out of all of
+ // them).
+ while (IsFramePartOfIBSplit(aContainingBlock) ||
+ aContainingBlock->IsInlineOutside() ||
+ aContainingBlock->Style()->IsPseudoOrAnonBox()) {
+ aContainingBlock = aContainingBlock->GetParent();
+ NS_ASSERTION(aContainingBlock,
+ "Must have non-inline, non-ib-split, non-pseudo frame as "
+ "root (or child of root, for a table root)!");
+ }
+
+ // Tell parent of the containing block to reformulate the
+ // entire block. This is painful and definitely not optimal
+ // but it will *always* get the right answer.
+
+ nsIContent* blockContent = aContainingBlock->GetContent();
+ TRACE("IB splits");
+ RecreateFramesForContent(blockContent, InsertionKind::Async);
+ return true;
+#undef TRACE
+}
+
+void nsCSSFrameConstructor::ReframeContainingBlock(nsIFrame* aFrame) {
+ // XXXbz how exactly would we get here while isReflowing anyway? Should this
+ // whole test be ifdef DEBUG?
+ if (mPresShell->IsReflowLocked()) {
+ // don't ReframeContainingBlock, this will result in a crash
+ // if we remove a tree that's in reflow - see bug 121368 for testcase
+ NS_ERROR(
+ "Atemptted to nsCSSFrameConstructor::ReframeContainingBlock during a "
+ "Reflow!!!");
+ return;
+ }
+
+ // Get the first "normal" ancestor of the target frame.
+ nsIFrame* containingBlock = GetIBContainingBlockFor(aFrame);
+ if (containingBlock) {
+ // From here we look for the containing block in case the target
+ // frame is already a block (which can happen when an inline frame
+ // wraps some of its content in an anonymous block; see
+ // ConstructInline)
+
+ // NOTE: We used to get the FloatContainingBlock here, but it was often
+ // wrong. GetIBContainingBlock works much better and provides the correct
+ // container in all cases so GetFloatContainingBlock(aFrame) has been
+ // removed
+
+ // And get the containingBlock's content
+ if (nsIContent* blockContent = containingBlock->GetContent()) {
+#ifdef DEBUG
+ if (gNoisyContentUpdates) {
+ printf(" ==> blockContent=%p\n", blockContent);
+ }
+#endif
+ RecreateFramesForContent(blockContent, InsertionKind::Async);
+ return;
+ }
+ }
+
+ // If we get here, we're screwed!
+ RecreateFramesForContent(mPresShell->GetDocument()->GetRootElement(),
+ InsertionKind::Async);
+}
+
+void nsCSSFrameConstructor::GenerateChildFrames(nsContainerFrame* aFrame) {
+ {
+ nsAutoScriptBlocker scriptBlocker;
+ nsFrameList childList;
+ nsFrameConstructorState state(mPresShell, nullptr, nullptr, nullptr);
+ ProcessChildren(state, aFrame->GetContent(), aFrame->Style(), aFrame, false,
+ childList, false);
+
+ aFrame->SetInitialChildList(kPrincipalList, childList);
+ }
+
+#ifdef ACCESSIBILITY
+ if (nsAccessibilityService* accService =
+ PresShell::GetAccessibilityService()) {
+ if (nsIContent* child = aFrame->GetContent()->GetFirstChild()) {
+ accService->ContentRangeInserted(mPresShell, child, nullptr);
+ }
+ }
+#endif
+}
+
+//////////////////////////////////////////////////////////
+// nsCSSFrameConstructor::FrameConstructionItem methods //
+//////////////////////////////////////////////////////////
+bool nsCSSFrameConstructor::FrameConstructionItem::IsWhitespace(
+ nsFrameConstructorState& aState) const {
+ MOZ_ASSERT(aState.mCreatingExtraFrames || !mContent->GetPrimaryFrame(),
+ "How did that happen?");
+ if (!mIsText) {
+ return false;
+ }
+ mContent->SetFlags(NS_CREATE_FRAME_IF_NON_WHITESPACE |
+ NS_REFRAME_IF_WHITESPACE);
+ return mContent->TextIsOnlyWhitespace();
+}
+
+//////////////////////////////////////////////////////////////
+// nsCSSFrameConstructor::FrameConstructionItemList methods //
+//////////////////////////////////////////////////////////////
+void nsCSSFrameConstructor::FrameConstructionItemList::AdjustCountsForItem(
+ FrameConstructionItem* aItem, int32_t aDelta) {
+ MOZ_ASSERT(aDelta == 1 || aDelta == -1, "Unexpected delta");
+ mItemCount += aDelta;
+ if (aItem->mIsAllInline) {
+ mInlineCount += aDelta;
+ }
+ if (aItem->mIsBlock) {
+ mBlockCount += aDelta;
+ }
+ if (aItem->mIsLineParticipant) {
+ mLineParticipantCount += aDelta;
+ }
+ mDesiredParentCounts[aItem->DesiredParentType()] += aDelta;
+}
+
+////////////////////////////////////////////////////////////////////////
+// nsCSSFrameConstructor::FrameConstructionItemList::Iterator methods //
+////////////////////////////////////////////////////////////////////////
+inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator::
+ SkipItemsWantingParentType(ParentType aParentType) {
+ MOZ_ASSERT(!IsDone(), "Shouldn't be done yet");
+ while (item().DesiredParentType() == aParentType) {
+ Next();
+ if (IsDone()) {
+ return true;
+ }
+ }
+ return false;
+}
+
+inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator::
+ SkipItemsNotWantingParentType(ParentType aParentType) {
+ MOZ_ASSERT(!IsDone(), "Shouldn't be done yet");
+ while (item().DesiredParentType() != aParentType) {
+ Next();
+ if (IsDone()) {
+ return true;
+ }
+ }
+ return false;
+}
+
+// Note: we implement -webkit-{inline-}box (and optionally -moz-{inline-}box)
+// using nsFlexContainerFrame, but we use different rules for what gets wrapped
+// in an anonymous flex item.
+bool nsCSSFrameConstructor::FrameConstructionItem::NeedsAnonFlexOrGridItem(
+ const nsFrameConstructorState& aState, bool aIsLegacyBox) {
+ if (mFCData->mBits & FCDATA_IS_LINE_PARTICIPANT) {
+ // This will be an inline non-replaced box.
+ return true;
+ }
+
+ if (aIsLegacyBox) {
+ if (mComputedStyle->StyleDisplay()->IsInlineOutsideStyle()) {
+ // In an emulated legacy box, all inline-level content gets wrapped in an
+ // anonymous flex item.
+ return true;
+ }
+ if (mIsPopup ||
+ (!(mFCData->mBits & FCDATA_DISALLOW_OUT_OF_FLOW) &&
+ aState.GetGeometricParent(*mComputedStyle->StyleDisplay(), nullptr))) {
+ // We're abspos or fixedpos (or a XUL popup), which means we'll spawn a
+ // placeholder which (because our container is an emulated legacy box)
+ // we'll need to wrap in an anonymous flex item. So, we just treat
+ // _this_ frame as if _it_ needs to be wrapped in an anonymous flex item,
+ // and then when we spawn the placeholder, it'll end up in the right
+ // spot.
+ return true;
+ }
+ }
+
+ return false;
+}
+
+inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator::
+ SkipItemsThatNeedAnonFlexOrGridItem(const nsFrameConstructorState& aState,
+ bool aIsLegacyBox) {
+ MOZ_ASSERT(!IsDone(), "Shouldn't be done yet");
+ while (item().NeedsAnonFlexOrGridItem(aState, aIsLegacyBox)) {
+ Next();
+ if (IsDone()) {
+ return true;
+ }
+ }
+ return false;
+}
+
+inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator::
+ SkipItemsThatDontNeedAnonFlexOrGridItem(
+ const nsFrameConstructorState& aState, bool aIsLegacyBox) {
+ MOZ_ASSERT(!IsDone(), "Shouldn't be done yet");
+ while (!(item().NeedsAnonFlexOrGridItem(aState, aIsLegacyBox))) {
+ Next();
+ if (IsDone()) {
+ return true;
+ }
+ }
+ return false;
+}
+
+inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator::
+ SkipItemsNotWantingRubyParent() {
+ MOZ_ASSERT(!IsDone(), "Shouldn't be done yet");
+ while (!IsRubyParentType(item().DesiredParentType())) {
+ Next();
+ if (IsDone()) {
+ return true;
+ }
+ }
+ return false;
+}
+
+inline bool
+nsCSSFrameConstructor::FrameConstructionItemList::Iterator::SkipWhitespace(
+ nsFrameConstructorState& aState) {
+ MOZ_ASSERT(!IsDone(), "Shouldn't be done yet");
+ MOZ_ASSERT(item().IsWhitespace(aState), "Not pointing to whitespace?");
+ do {
+ Next();
+ if (IsDone()) {
+ return true;
+ }
+ } while (item().IsWhitespace(aState));
+
+ return false;
+}
+
+void nsCSSFrameConstructor::FrameConstructionItemList::Iterator::
+ AppendItemToList(FrameConstructionItemList& aTargetList) {
+ NS_ASSERTION(&aTargetList != &mList, "Unexpected call");
+ MOZ_ASSERT(!IsDone(), "should not be done");
+
+ FrameConstructionItem* item = mCurrent;
+ Next();
+ item->remove();
+ aTargetList.mItems.insertBack(item);
+
+ mList.AdjustCountsForItem(item, -1);
+ aTargetList.AdjustCountsForItem(item, 1);
+}
+
+void nsCSSFrameConstructor::FrameConstructionItemList::Iterator::
+ AppendItemsToList(nsCSSFrameConstructor* aFCtor, const Iterator& aEnd,
+ FrameConstructionItemList& aTargetList) {
+ NS_ASSERTION(&aTargetList != &mList, "Unexpected call");
+ MOZ_ASSERT(&mList == &aEnd.mList, "End iterator for some other list?");
+
+ // We can't just move our guts to the other list if it already has
+ // some information or if we're not moving our entire list.
+ if (!AtStart() || !aEnd.IsDone() || !aTargetList.IsEmpty()) {
+ do {
+ AppendItemToList(aTargetList);
+ } while (*this != aEnd);
+ return;
+ }
+
+ // Move our entire list of items into the empty target list.
+ aTargetList.mItems = std::move(mList.mItems);
+
+ // Copy over the various counters
+ aTargetList.mInlineCount = mList.mInlineCount;
+ aTargetList.mBlockCount = mList.mBlockCount;
+ aTargetList.mLineParticipantCount = mList.mLineParticipantCount;
+ aTargetList.mItemCount = mList.mItemCount;
+ memcpy(aTargetList.mDesiredParentCounts, mList.mDesiredParentCounts,
+ sizeof(aTargetList.mDesiredParentCounts));
+
+ // reset mList
+ mList.Reset(aFCtor);
+
+ // Point ourselves to aEnd, as advertised
+ SetToEnd();
+ MOZ_ASSERT(*this == aEnd, "How did that happen?");
+}
+
+void nsCSSFrameConstructor::FrameConstructionItemList::Iterator::InsertItem(
+ FrameConstructionItem* aItem) {
+ if (IsDone()) {
+ mList.mItems.insertBack(aItem);
+ } else {
+ // Just insert the item before us. There's no magic here.
+ mCurrent->setPrevious(aItem);
+ }
+ mList.AdjustCountsForItem(aItem, 1);
+
+ MOZ_ASSERT(aItem->getNext() == mCurrent, "How did that happen?");
+}
+
+void nsCSSFrameConstructor::FrameConstructionItemList::Iterator::DeleteItemsTo(
+ nsCSSFrameConstructor* aFCtor, const Iterator& aEnd) {
+ MOZ_ASSERT(&mList == &aEnd.mList, "End iterator for some other list?");
+ MOZ_ASSERT(*this != aEnd, "Shouldn't be at aEnd yet");
+
+ do {
+ NS_ASSERTION(!IsDone(), "Ran off end of list?");
+ FrameConstructionItem* item = mCurrent;
+ Next();
+ item->remove();
+ mList.AdjustCountsForItem(item, -1);
+ item->Delete(aFCtor);
+ } while (*this != aEnd);
+}
+
+void nsCSSFrameConstructor::QuotesDirty() {
+ mQuotesDirty = true;
+ mPresShell->SetNeedLayoutFlush();
+}
+
+void nsCSSFrameConstructor::CountersDirty() {
+ mCountersDirty = true;
+ mPresShell->SetNeedLayoutFlush();
+}
+
+void* nsCSSFrameConstructor::AllocateFCItem() {
+ void* item;
+ if (mFirstFreeFCItem) {
+ item = mFirstFreeFCItem;
+ mFirstFreeFCItem = mFirstFreeFCItem->mNext;
+ } else {
+ item = mFCItemPool.Allocate(sizeof(FrameConstructionItem));
+ }
+ ++mFCItemsInUse;
+ return item;
+}
+
+void nsCSSFrameConstructor::FreeFCItem(FrameConstructionItem* aItem) {
+ MOZ_ASSERT(mFCItemsInUse != 0);
+ if (--mFCItemsInUse == 0) {
+ // The arena is now unused - clear it but retain one chunk.
+ mFirstFreeFCItem = nullptr;
+ mFCItemPool.Clear();
+ } else {
+ // Prepend it to the list of free items.
+ FreeFCItemLink* item = reinterpret_cast<FreeFCItemLink*>(aItem);
+ item->mNext = mFirstFreeFCItem;
+ mFirstFreeFCItem = item;
+ }
+}
+
+void nsCSSFrameConstructor::AddSizeOfIncludingThis(
+ nsWindowSizes& aSizes) const {
+ if (nsIFrame* rootFrame = GetRootFrame()) {
+ rootFrame->AddSizeOfExcludingThisForTree(aSizes);
+ if (RetainedDisplayListBuilder* builder =
+ rootFrame->GetProperty(RetainedDisplayListBuilder::Cached())) {
+ builder->AddSizeOfIncludingThis(aSizes);
+ }
+ }
+
+ // This must be done after measuring from the frame tree, since frame
+ // manager will measure sizes of staled computed values and style
+ // structs, which only make sense after we know what are being used.
+ nsFrameManager::AddSizeOfIncludingThis(aSizes);
+
+ // Measurement of the following members may be added later if DMD finds it
+ // is worthwhile:
+ // - mFCItemPool
+ // - mQuoteList
+ // - mCounterManager
+}