diff options
Diffstat (limited to 'layout/forms/nsHTMLButtonControlFrame.cpp')
| -rw-r--r-- | layout/forms/nsHTMLButtonControlFrame.cpp | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/layout/forms/nsHTMLButtonControlFrame.cpp b/layout/forms/nsHTMLButtonControlFrame.cpp new file mode 100644 index 0000000000..7a599f093b --- /dev/null +++ b/layout/forms/nsHTMLButtonControlFrame.cpp @@ -0,0 +1,394 @@ +/* -*- 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/. */ + +#include "nsHTMLButtonControlFrame.h" + +#include "mozilla/Baseline.h" +#include "mozilla/PresShell.h" +#include "nsIFrameInlines.h" +#include "nsContainerFrame.h" +#include "nsIFormControlFrame.h" +#include "nsPresContext.h" +#include "nsLayoutUtils.h" +#include "nsGkAtoms.h" +#include "nsButtonFrameRenderer.h" +#include "nsDisplayList.h" +#include <algorithm> + +using namespace mozilla; + +nsContainerFrame* NS_NewHTMLButtonControlFrame(PresShell* aPresShell, + ComputedStyle* aStyle) { + return new (aPresShell) + nsHTMLButtonControlFrame(aStyle, aPresShell->GetPresContext()); +} + +NS_IMPL_FRAMEARENA_HELPERS(nsHTMLButtonControlFrame) + +nsHTMLButtonControlFrame::nsHTMLButtonControlFrame(ComputedStyle* aStyle, + nsPresContext* aPresContext, + nsIFrame::ClassID aID) + : nsContainerFrame(aStyle, aPresContext, aID) {} + +nsHTMLButtonControlFrame::~nsHTMLButtonControlFrame() = default; + +void nsHTMLButtonControlFrame::Init(nsIContent* aContent, + nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) { + nsContainerFrame::Init(aContent, aParent, aPrevInFlow); + mRenderer.SetFrame(this, PresContext()); +} + +NS_QUERYFRAME_HEAD(nsHTMLButtonControlFrame) + NS_QUERYFRAME_ENTRY(nsIFormControlFrame) +NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame) + +#ifdef ACCESSIBILITY +a11y::AccType nsHTMLButtonControlFrame::AccessibleType() { + return a11y::eHTMLButtonType; +} +#endif + +void nsHTMLButtonControlFrame::SetFocus(bool aOn, bool aRepaint) {} + +nsresult nsHTMLButtonControlFrame::HandleEvent(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + // if disabled do nothing + if (mRenderer.isDisabled()) { + return NS_OK; + } + + // mouse clicks are handled by content + // we don't want our children to get any events. So just pass it to frame. + return nsIFrame::HandleEvent(aPresContext, aEvent, aEventStatus); +} + +bool nsHTMLButtonControlFrame::ShouldClipPaintingToBorderBox() { + // FIXME(emilio): probably should account for per-axis clipping... + return StyleDisplay()->mOverflowX != StyleOverflow::Visible; +} + +void nsHTMLButtonControlFrame::BuildDisplayList( + nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) { + nsDisplayList onTop(aBuilder); + if (IsVisibleForPainting()) { + // Clip the button itself to its border area for event hit testing. + Maybe<DisplayListClipState::AutoSaveRestore> eventClipState; + if (aBuilder->IsForEventDelivery()) { + eventClipState.emplace(aBuilder); + nsRect rect(aBuilder->ToReferenceFrame(this), GetSize()); + nscoord radii[8]; + bool hasRadii = GetBorderRadii(radii); + eventClipState->ClipContainingBlockDescendants( + rect, hasRadii ? radii : nullptr); + } + + mRenderer.DisplayButton(aBuilder, aLists.BorderBackground(), &onTop); + } + + nsDisplayListCollection set(aBuilder); + + { + DisplayListClipState::AutoSaveRestore clipState(aBuilder); + + if (ShouldClipPaintingToBorderBox()) { + nsMargin border = StyleBorder()->GetComputedBorder(); + nsRect rect(aBuilder->ToReferenceFrame(this), GetSize()); + rect.Deflate(border); + nscoord radii[8]; + bool hasRadii = GetPaddingBoxBorderRadii(radii); + clipState.ClipContainingBlockDescendants(rect, + hasRadii ? radii : nullptr); + } + + BuildDisplayListForChild(aBuilder, mFrames.FirstChild(), set, + DisplayChildFlag::ForcePseudoStackingContext); + } + + // Put the foreground outline and focus rects on top of the children + set.Content()->AppendToTop(&onTop); + set.MoveTo(aLists); + + DisplayOutline(aBuilder, aLists); + + // to draw border when selected in editor + DisplaySelectionOverlay(aBuilder, aLists.Content()); +} + +nscoord nsHTMLButtonControlFrame::GetMinISize(gfxContext* aRenderingContext) { + nscoord result; + DISPLAY_MIN_INLINE_SIZE(this, result); + if (Maybe<nscoord> containISize = ContainIntrinsicISize()) { + result = *containISize; + } else { + nsIFrame* kid = mFrames.FirstChild(); + result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, kid, + IntrinsicISizeType::MinISize); + } + return result; +} + +nscoord nsHTMLButtonControlFrame::GetPrefISize(gfxContext* aRenderingContext) { + nscoord result; + DISPLAY_PREF_INLINE_SIZE(this, result); + if (Maybe<nscoord> containISize = ContainIntrinsicISize()) { + result = *containISize; + } else { + nsIFrame* kid = mFrames.FirstChild(); + result = nsLayoutUtils::IntrinsicForContainer( + aRenderingContext, kid, IntrinsicISizeType::PrefISize); + } + return result; +} + +void nsHTMLButtonControlFrame::Reflow(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput, + nsReflowStatus& aStatus) { + MarkInReflow(); + DO_GLOBAL_REFLOW_COUNT("nsHTMLButtonControlFrame"); + DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus); + MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!"); + + // Reflow the child + nsIFrame* firstKid = mFrames.FirstChild(); + + MOZ_ASSERT(firstKid, "Button should have a child frame for its contents"); + MOZ_ASSERT(!firstKid->GetNextSibling(), + "Button should have exactly one child frame"); + MOZ_ASSERT( + firstKid->Style()->GetPseudoType() == PseudoStyleType::buttonContent, + "Button's child frame has unexpected pseudo type!"); + + // XXXbz Eventually we may want to check-and-bail if + // !aReflowInput.ShouldReflowAllKids() && + // !firstKid->IsSubtreeDirty(). + // We'd need to cache our ascent for that, of course. + + // Reflow the contents of the button. + // (This populates our aDesiredSize, too.) + ReflowButtonContents(aPresContext, aDesiredSize, aReflowInput, firstKid); + + if (!ShouldClipPaintingToBorderBox()) { + ConsiderChildOverflow(aDesiredSize.mOverflowAreas, firstKid); + } + // else, we ignore child overflow -- anything that overflows beyond our + // own border-box will get clipped when painting. + + FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, aReflowInput, + aStatus); + + // We're always complete and we don't support overflow containers + // so we shouldn't have a next-in-flow ever. + aStatus.Reset(); + MOZ_ASSERT(!GetNextInFlow()); +} + +void nsHTMLButtonControlFrame::ReflowButtonContents( + nsPresContext* aPresContext, ReflowOutput& aButtonDesiredSize, + const ReflowInput& aButtonReflowInput, nsIFrame* aFirstKid) { + WritingMode wm = GetWritingMode(); + LogicalSize availSize = aButtonReflowInput.ComputedSize(wm); + availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE; + + // shorthand for a value we need to use in a bunch of places + const LogicalMargin& clbp = + aButtonReflowInput.ComputedLogicalBorderPadding(wm); + + LogicalPoint childPos(wm); + childPos.I(wm) = clbp.IStart(wm); + availSize.ISize(wm) = std::max(availSize.ISize(wm), 0); + + ReflowInput contentsReflowInput(aPresContext, aButtonReflowInput, aFirstKid, + availSize); + + nsReflowStatus contentsReflowStatus; + ReflowOutput contentsDesiredSize(aButtonReflowInput); + childPos.B(wm) = 0; // This will be set properly later, after reflowing the + // child to determine its size. + + if (aFirstKid->IsFlexOrGridContainer()) { + // XXX: Should we use ResetResizeFlags::Yes? + contentsReflowInput.SetComputedBSize(aButtonReflowInput.ComputedBSize(), + ReflowInput::ResetResizeFlags::No); + contentsReflowInput.SetComputedMinBSize( + aButtonReflowInput.ComputedMinBSize()); + contentsReflowInput.SetComputedMaxBSize( + aButtonReflowInput.ComputedMaxBSize()); + } + + // We just pass a dummy containerSize here, as the child will be + // repositioned later by FinishReflowChild. + nsSize dummyContainerSize; + ReflowChild(aFirstKid, aPresContext, contentsDesiredSize, contentsReflowInput, + wm, childPos, dummyContainerSize, ReflowChildFlags::Default, + contentsReflowStatus); + MOZ_ASSERT(contentsReflowStatus.IsComplete(), + "We gave button-contents frame unconstrained available height, " + "so it should be complete"); + + // Compute the button's content-box size: + LogicalSize buttonContentBox(wm); + if (aButtonReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE) { + // Button has a fixed block-size -- that's its content-box bSize. + buttonContentBox.BSize(wm) = aButtonReflowInput.ComputedBSize(); + } else { + // Button is intrinsically sized -- it should shrinkwrap the + // button-contents' bSize. But if it has size containment in block axis, + // ignore the contents and use contain-intrinsic-block-size. + nscoord bSize = aButtonReflowInput.mFrame->ContainIntrinsicBSize().valueOr( + contentsDesiredSize.BSize(wm)); + + // Make sure we obey min/max-bSize in the case when we're doing intrinsic + // sizing (we get it for free when we have a non-intrinsic + // aButtonReflowInput.ComputedBSize()). Note that we do this before + // adjusting for borderpadding, since mComputedMaxBSize and + // mComputedMinBSize are content bSizes. + buttonContentBox.BSize(wm) = aButtonReflowInput.ApplyMinMaxBSize(bSize); + } + if (aButtonReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE) { + buttonContentBox.ISize(wm) = aButtonReflowInput.ComputedISize(); + } else { + nscoord iSize = aButtonReflowInput.mFrame->ContainIntrinsicISize().valueOr( + contentsDesiredSize.ISize(wm)); + buttonContentBox.ISize(wm) = aButtonReflowInput.ApplyMinMaxISize(iSize); + } + + // Center child in the block-direction in the button + // (technically, inside of the button's focus-padding area) + nscoord extraSpace = + buttonContentBox.BSize(wm) - contentsDesiredSize.BSize(wm); + + childPos.B(wm) = std::max(0, extraSpace / 2); + + // Adjust childPos.B() to be in terms of the button's frame-rect: + childPos.B(wm) += clbp.BStart(wm); + + nsSize containerSize = (buttonContentBox + clbp.Size(wm)).GetPhysicalSize(wm); + + // Place the child + FinishReflowChild(aFirstKid, aPresContext, contentsDesiredSize, + &contentsReflowInput, wm, childPos, containerSize, + ReflowChildFlags::Default); + + // Make sure we have a useful 'ascent' value for the child + if (contentsDesiredSize.BlockStartAscent() == + ReflowOutput::ASK_FOR_BASELINE) { + WritingMode wm = aButtonReflowInput.GetWritingMode(); + contentsDesiredSize.SetBlockStartAscent(aFirstKid->GetLogicalBaseline(wm)); + } + + // OK, we're done with the child frame. + // Use what we learned to populate the button frame's reflow metrics. + // * Button's height & width are content-box size + border-box contribution: + aButtonDesiredSize.SetSize( + wm, + LogicalSize(wm, aButtonReflowInput.ComputedISize() + clbp.IStartEnd(wm), + buttonContentBox.BSize(wm) + clbp.BStartEnd(wm))); + + // * Button's ascent is its child's ascent, plus the child's block-offset + // within our frame... unless it's orthogonal, in which case we'll use the + // contents inline-size as an approximation for now. + // XXX is there a better strategy? should we include border-padding? + if (!aButtonReflowInput.mStyleDisplay->IsContainLayout()) { + if (aButtonDesiredSize.GetWritingMode().IsOrthogonalTo(wm)) { + aButtonDesiredSize.SetBlockStartAscent( + wm.IsAlphabeticalBaseline() ? contentsDesiredSize.ISize(wm) + : contentsDesiredSize.ISize(wm) / 2); + } else { + aButtonDesiredSize.SetBlockStartAscent( + contentsDesiredSize.BlockStartAscent() + childPos.B(wm)); + } + } // else: we're layout-contained, and so we have no baseline. + + aButtonDesiredSize.SetOverflowAreasToDesiredBounds(); +} + +Maybe<nscoord> nsHTMLButtonControlFrame::GetNaturalBaselineBOffset( + WritingMode aWM, BaselineSharingGroup aBaselineGroup, + BaselineExportContext aExportContext) const { + if (StyleDisplay()->IsContainLayout()) { + return Nothing{}; + } + + nsIFrame* inner = mFrames.FirstChild(); + if (MOZ_UNLIKELY(inner->GetWritingMode().IsOrthogonalTo(aWM))) { + return Nothing{}; + } + auto result = + inner->GetNaturalBaselineBOffset(aWM, aBaselineGroup, aExportContext) + .valueOrFrom([inner, aWM, aBaselineGroup]() { + return Baseline::SynthesizeBOffsetFromBorderBox(inner, aWM, + aBaselineGroup); + }); + + nscoord innerBStart = inner->BStart(aWM, GetSize()); + if (aBaselineGroup == BaselineSharingGroup::First) { + return Some(result + innerBStart); + } + return Some(result + BSize(aWM) - (innerBStart + inner->BSize(aWM))); +} + +BaselineSharingGroup nsHTMLButtonControlFrame::GetDefaultBaselineSharingGroup() + const { + nsIFrame* firstKid = mFrames.FirstChild(); + + MOZ_ASSERT(firstKid, "Button should have a child frame for its contents"); + MOZ_ASSERT(!firstKid->GetNextSibling(), + "Button should have exactly one child frame"); + return firstKid->GetDefaultBaselineSharingGroup(); +} + +nscoord nsHTMLButtonControlFrame::SynthesizeFallbackBaseline( + mozilla::WritingMode aWM, BaselineSharingGroup aBaselineGroup) const { + return Baseline::SynthesizeBOffsetFromMarginBox(this, aWM, aBaselineGroup); +} + +nsresult nsHTMLButtonControlFrame::SetFormProperty(nsAtom* aName, + const nsAString& aValue) { + if (nsGkAtoms::value == aName) { + return mContent->AsElement()->SetAttr(kNameSpaceID_None, nsGkAtoms::value, + aValue, true); + } + return NS_OK; +} + +ComputedStyle* nsHTMLButtonControlFrame::GetAdditionalComputedStyle( + int32_t aIndex) const { + return mRenderer.GetComputedStyle(aIndex); +} + +void nsHTMLButtonControlFrame::SetAdditionalComputedStyle( + int32_t aIndex, ComputedStyle* aComputedStyle) { + mRenderer.SetComputedStyle(aIndex, aComputedStyle); +} + +void nsHTMLButtonControlFrame::AppendDirectlyOwnedAnonBoxes( + nsTArray<OwnedAnonBox>& aResult) { + MOZ_ASSERT(mFrames.FirstChild(), "Must have our button-content anon box"); + MOZ_ASSERT(!mFrames.FirstChild()->GetNextSibling(), + "Must only have our button-content anon box"); + aResult.AppendElement(OwnedAnonBox(mFrames.FirstChild())); +} + +#ifdef DEBUG +void nsHTMLButtonControlFrame::AppendFrames(ChildListID aListID, + nsFrameList&& aFrameList) { + MOZ_CRASH("unsupported operation"); +} + +void nsHTMLButtonControlFrame::InsertFrames( + ChildListID aListID, nsIFrame* aPrevFrame, + const nsLineList::iterator* aPrevFrameLine, nsFrameList&& aFrameList) { + MOZ_CRASH("unsupported operation"); +} + +void nsHTMLButtonControlFrame::RemoveFrame(DestroyContext&, ChildListID, + nsIFrame*) { + MOZ_CRASH("unsupported operation"); +} +#endif |