diff options
Diffstat (limited to 'layout/forms/nsFieldSetFrame.cpp')
| -rw-r--r-- | layout/forms/nsFieldSetFrame.cpp | 952 |
1 files changed, 952 insertions, 0 deletions
diff --git a/layout/forms/nsFieldSetFrame.cpp b/layout/forms/nsFieldSetFrame.cpp new file mode 100644 index 0000000000..e45bb0f5ec --- /dev/null +++ b/layout/forms/nsFieldSetFrame.cpp @@ -0,0 +1,952 @@ +/* -*- 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 "nsFieldSetFrame.h" +#include "mozilla/dom/HTMLLegendElement.h" + +#include <algorithm> +#include "gfxContext.h" +#include "mozilla/gfx/2D.h" +#include "mozilla/Likely.h" +#include "mozilla/PresShell.h" +#include "mozilla/Maybe.h" +#include "mozilla/webrender/WebRenderAPI.h" +#include "nsBlockFrame.h" +#include "nsCSSAnonBoxes.h" +#include "nsCSSFrameConstructor.h" +#include "nsCSSRendering.h" +#include "nsDisplayList.h" +#include "nsGkAtoms.h" +#include "nsIFrameInlines.h" +#include "nsIScrollableFrame.h" +#include "nsLayoutUtils.h" +#include "nsStyleConsts.h" + +using namespace mozilla; +using namespace mozilla::gfx; +using namespace mozilla::layout; +using image::ImgDrawResult; + +nsContainerFrame* NS_NewFieldSetFrame(PresShell* aPresShell, + ComputedStyle* aStyle) { + return new (aPresShell) nsFieldSetFrame(aStyle, aPresShell->GetPresContext()); +} + +NS_IMPL_FRAMEARENA_HELPERS(nsFieldSetFrame) +NS_QUERYFRAME_HEAD(nsFieldSetFrame) + NS_QUERYFRAME_ENTRY(nsFieldSetFrame) +NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame) + +nsFieldSetFrame::nsFieldSetFrame(ComputedStyle* aStyle, + nsPresContext* aPresContext) + : nsContainerFrame(aStyle, aPresContext, kClassID), + mLegendRect(GetWritingMode()) { + mLegendSpace = 0; +} + +nsRect nsFieldSetFrame::VisualBorderRectRelativeToSelf() const { + WritingMode wm = GetWritingMode(); + LogicalRect r(wm, LogicalPoint(wm, 0, 0), GetLogicalSize(wm)); + nsSize containerSize = r.Size(wm).GetPhysicalSize(wm); + nsIFrame* legend = GetLegend(); + if (legend && !GetPrevInFlow()) { + nscoord legendSize = legend->GetLogicalSize(wm).BSize(wm); + auto legendMargin = legend->GetLogicalUsedMargin(wm); + nscoord legendStartMargin = legendMargin.BStart(wm); + nscoord legendEndMargin = legendMargin.BEnd(wm); + nscoord border = GetUsedBorder().Side(wm.PhysicalSide(eLogicalSideBStart)); + // Calculate the offset from the border area block-axis start edge needed to + // center-align our border with the legend's border-box (in the block-axis). + nscoord off = (legendStartMargin + legendSize / 2) - border / 2; + // We don't want to display our border above our border area. + if (off > nscoord(0)) { + nscoord marginBoxSize = legendStartMargin + legendSize + legendEndMargin; + if (marginBoxSize > border) { + // We don't want to display our border below the legend's margin-box, + // so we align it to the block-axis end if that happens. + nscoord overflow = off + border - marginBoxSize; + if (overflow > nscoord(0)) { + off -= overflow; + } + r.BStart(wm) += off; + r.BSize(wm) -= off; + } + } + } + return r.GetPhysicalRect(wm, containerSize); +} + +nsContainerFrame* nsFieldSetFrame::GetInner() const { + for (nsIFrame* child : mFrames) { + if (child->Style()->GetPseudoType() == PseudoStyleType::fieldsetContent) { + return static_cast<nsContainerFrame*>(child); + } + } + return nullptr; +} + +nsIFrame* nsFieldSetFrame::GetLegend() const { + for (nsIFrame* child : mFrames) { + if (child->Style()->GetPseudoType() != PseudoStyleType::fieldsetContent) { + return child; + } + } + return nullptr; +} + +namespace mozilla { + +class nsDisplayFieldSetBorder final : public nsPaintedDisplayItem { + public: + nsDisplayFieldSetBorder(nsDisplayListBuilder* aBuilder, + nsFieldSetFrame* aFrame) + : nsPaintedDisplayItem(aBuilder, aFrame) { + MOZ_COUNT_CTOR(nsDisplayFieldSetBorder); + } + MOZ_COUNTED_DTOR_OVERRIDE(nsDisplayFieldSetBorder) + + virtual void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override; + bool CreateWebRenderCommands( + mozilla::wr::DisplayListBuilder& aBuilder, + mozilla::wr::IpcResourceUpdateQueue& aResources, + const StackingContextHelper& aSc, + mozilla::layers::RenderRootStateManager* aManager, + nsDisplayListBuilder* aDisplayListBuilder) override; + virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, + bool* aSnap) const override; + NS_DISPLAY_DECL_NAME("FieldSetBorder", TYPE_FIELDSET_BORDER_BACKGROUND) +}; + +void nsDisplayFieldSetBorder::Paint(nsDisplayListBuilder* aBuilder, + gfxContext* aCtx) { + Unused << static_cast<nsFieldSetFrame*>(mFrame)->PaintBorder( + aBuilder, *aCtx, ToReferenceFrame(), GetPaintRect(aBuilder, aCtx)); +} + +nsRect nsDisplayFieldSetBorder::GetBounds(nsDisplayListBuilder* aBuilder, + bool* aSnap) const { + // Just go ahead and claim our frame's overflow rect as the bounds, because we + // may have border-image-outset or other features that cause borders to extend + // outside the border rect. We could try to duplicate all the complexity + // nsDisplayBorder has here, but keeping things in sync would be a pain, and + // this code is not typically performance-sensitive. + *aSnap = false; + return Frame()->InkOverflowRectRelativeToSelf() + ToReferenceFrame(); +} + +bool nsDisplayFieldSetBorder::CreateWebRenderCommands( + mozilla::wr::DisplayListBuilder& aBuilder, + mozilla::wr::IpcResourceUpdateQueue& aResources, + const StackingContextHelper& aSc, + mozilla::layers::RenderRootStateManager* aManager, + nsDisplayListBuilder* aDisplayListBuilder) { + auto frame = static_cast<nsFieldSetFrame*>(mFrame); + auto offset = ToReferenceFrame(); + Maybe<wr::SpaceAndClipChainHelper> clipOut; + + nsRect rect = frame->VisualBorderRectRelativeToSelf() + offset; + nsDisplayBoxShadowInner::CreateInsetBoxShadowWebRenderCommands( + aBuilder, aSc, rect, mFrame, rect); + + if (nsIFrame* legend = frame->GetLegend()) { + nsRect legendRect = legend->GetNormalRect() + offset; + + // Make sure we clip all of the border in case the legend is smaller. + nscoord borderTopWidth = frame->GetUsedBorder().top; + if (legendRect.height < borderTopWidth) { + legendRect.height = borderTopWidth; + legendRect.y = offset.y; + } + + if (!legendRect.IsEmpty()) { + // We need to clip out the part of the border where the legend would go + auto appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel(); + auto layoutRect = wr::ToLayoutRect(LayoutDeviceRect::FromAppUnits( + frame->InkOverflowRectRelativeToSelf() + offset, + appUnitsPerDevPixel)); + + wr::ComplexClipRegion region; + region.rect = wr::ToLayoutRect( + LayoutDeviceRect::FromAppUnits(legendRect, appUnitsPerDevPixel)); + region.mode = wr::ClipMode::ClipOut; + region.radii = wr::EmptyBorderRadius(); + + auto rect_clip = aBuilder.DefineRectClip(Nothing(), layoutRect); + auto complex_clip = aBuilder.DefineRoundedRectClip(Nothing(), region); + auto clipChain = + aBuilder.DefineClipChain({rect_clip, complex_clip}, true); + clipOut.emplace(aBuilder, clipChain); + } + } else { + rect = nsRect(offset, frame->GetRect().Size()); + } + + ImgDrawResult drawResult = nsCSSRendering::CreateWebRenderCommandsForBorder( + this, mFrame, rect, aBuilder, aResources, aSc, aManager, + aDisplayListBuilder); + if (drawResult == ImgDrawResult::NOT_SUPPORTED) { + return false; + } + return true; +}; + +} // namespace mozilla + +void nsFieldSetFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, + const nsDisplayListSet& aLists) { + // Paint our background and border in a special way. + // REVIEW: We don't really need to check frame emptiness here; if it's empty, + // the background/border display item won't do anything, and if it isn't + // empty, we need to paint the outline + if (!HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER) && + IsVisibleForPainting()) { + DisplayOutsetBoxShadowUnconditional(aBuilder, aLists.BorderBackground()); + + const nsRect rect = + VisualBorderRectRelativeToSelf() + aBuilder->ToReferenceFrame(this); + + nsDisplayBackgroundImage::AppendBackgroundItemsToTop( + aBuilder, this, rect, aLists.BorderBackground(), + /* aAllowWillPaintBorderOptimization = */ false); + + aLists.BorderBackground()->AppendNewToTop<nsDisplayFieldSetBorder>(aBuilder, + this); + + DisplayOutlineUnconditional(aBuilder, aLists); + + DO_GLOBAL_REFLOW_COUNT_DSP("nsFieldSetFrame"); + } + + if (GetPrevInFlow()) { + DisplayOverflowContainers(aBuilder, aLists); + } + + nsDisplayListCollection contentDisplayItems(aBuilder); + if (nsIFrame* inner = GetInner()) { + // Collect the inner frame's display items into their own collection. + // We need to be calling BuildDisplayList on it before the legend in + // case it contains out-of-flow frames whose placeholders are in the + // legend. However, we want the inner frame's display items to be + // after the legend's display items in z-order, so we need to save them + // and append them later. + BuildDisplayListForChild(aBuilder, inner, contentDisplayItems); + } + if (nsIFrame* legend = GetLegend()) { + // The legend's background goes on our BlockBorderBackgrounds list because + // it's a block child. + nsDisplayListSet set(aLists, aLists.BlockBorderBackgrounds()); + BuildDisplayListForChild(aBuilder, legend, set); + } + // Put the inner frame's display items on the master list. Note that this + // moves its border/background display items to our BorderBackground() list, + // which isn't really correct, but it's OK because the inner frame is + // anonymous and can't have its own border and background. + contentDisplayItems.MoveTo(aLists); +} + +ImgDrawResult nsFieldSetFrame::PaintBorder(nsDisplayListBuilder* aBuilder, + gfxContext& aRenderingContext, + nsPoint aPt, + const nsRect& aDirtyRect) { + // If the border is smaller than the legend, move the border down + // to be centered on the legend. We call VisualBorderRectRelativeToSelf() to + // compute the border positioning. + // FIXME: This means border-radius clamping is incorrect; we should + // override nsIFrame::GetBorderRadii. + nsRect rect = VisualBorderRectRelativeToSelf() + aPt; + nsPresContext* presContext = PresContext(); + + const auto skipSides = GetSkipSides(); + PaintBorderFlags borderFlags = aBuilder->ShouldSyncDecodeImages() + ? PaintBorderFlags::SyncDecodeImages + : PaintBorderFlags(); + + ImgDrawResult result = ImgDrawResult::SUCCESS; + + nsCSSRendering::PaintBoxShadowInner(presContext, aRenderingContext, this, + rect); + + if (nsIFrame* legend = GetLegend()) { + // We want to avoid drawing our border under the legend, so clip out the + // legend while drawing our border. We don't want to use mLegendRect here, + // because we do want to draw our border under the legend's inline-start and + // -end margins. And we use GetNormalRect(), not GetRect(), because we do + // not want relative positioning applied to the legend to change how our + // border looks. + nsRect legendRect = legend->GetNormalRect() + aPt; + + // Make sure we clip all of the border in case the legend is smaller. + nscoord borderTopWidth = GetUsedBorder().top; + if (legendRect.height < borderTopWidth) { + legendRect.height = borderTopWidth; + legendRect.y = aPt.y; + } + + DrawTarget* drawTarget = aRenderingContext.GetDrawTarget(); + // We set up a clip path which has our rect clockwise and the legend rect + // counterclockwise, with FILL_WINDING as the fill rule. That will allow us + // to paint within our rect but outside the legend rect. For "our rect" we + // use our ink overflow rect (relative to ourselves, so it's not affected + // by transforms), because we can have borders sticking outside our border + // box (e.g. due to border-image-outset). + RefPtr<PathBuilder> pathBuilder = + drawTarget->CreatePathBuilder(FillRule::FILL_WINDING); + int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel(); + AppendRectToPath(pathBuilder, + NSRectToSnappedRect(InkOverflowRectRelativeToSelf() + aPt, + appUnitsPerDevPixel, *drawTarget), + true); + AppendRectToPath( + pathBuilder, + NSRectToSnappedRect(legendRect, appUnitsPerDevPixel, *drawTarget), + false); + RefPtr<Path> clipPath = pathBuilder->Finish(); + + aRenderingContext.Save(); + aRenderingContext.Clip(clipPath); + result &= nsCSSRendering::PaintBorder(presContext, aRenderingContext, this, + aDirtyRect, rect, mComputedStyle, + borderFlags, skipSides); + aRenderingContext.Restore(); + } else { + result &= nsCSSRendering::PaintBorder( + presContext, aRenderingContext, this, aDirtyRect, + nsRect(aPt, mRect.Size()), mComputedStyle, borderFlags, skipSides); + } + + return result; +} + +nscoord nsFieldSetFrame::GetIntrinsicISize(gfxContext* aRenderingContext, + IntrinsicISizeType aType) { + // Both inner and legend are children, and if the fieldset is + // size-contained they should not contribute to the intrinsic size. + if (Maybe<nscoord> containISize = ContainIntrinsicISize()) { + return *containISize; + } + + nscoord legendWidth = 0; + if (nsIFrame* legend = GetLegend()) { + legendWidth = + nsLayoutUtils::IntrinsicForContainer(aRenderingContext, legend, aType); + } + + nscoord contentWidth = 0; + if (nsIFrame* inner = GetInner()) { + // Ignore padding on the inner, since the padding will be applied to the + // outer instead, and the padding computed for the inner is wrong + // for percentage padding. + contentWidth = nsLayoutUtils::IntrinsicForContainer( + aRenderingContext, inner, aType, nsLayoutUtils::IGNORE_PADDING); + } + + return std::max(legendWidth, contentWidth); +} + +nscoord nsFieldSetFrame::GetMinISize(gfxContext* aRenderingContext) { + nscoord result = 0; + DISPLAY_MIN_INLINE_SIZE(this, result); + + result = GetIntrinsicISize(aRenderingContext, IntrinsicISizeType::MinISize); + return result; +} + +nscoord nsFieldSetFrame::GetPrefISize(gfxContext* aRenderingContext) { + nscoord result = 0; + DISPLAY_PREF_INLINE_SIZE(this, result); + + result = GetIntrinsicISize(aRenderingContext, IntrinsicISizeType::PrefISize); + return result; +} + +/* virtual */ +void nsFieldSetFrame::Reflow(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput, + nsReflowStatus& aStatus) { + using LegendAlignValue = mozilla::dom::HTMLLegendElement::LegendAlignValue; + + MarkInReflow(); + DO_GLOBAL_REFLOW_COUNT("nsFieldSetFrame"); + DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus); + MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!"); + NS_WARNING_ASSERTION(aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE, + "Should have a precomputed inline-size!"); + + OverflowAreas ocBounds; + nsReflowStatus ocStatus; + auto* prevInFlow = static_cast<nsFieldSetFrame*>(GetPrevInFlow()); + if (prevInFlow) { + ReflowOverflowContainerChildren(aPresContext, aReflowInput, ocBounds, + ReflowChildFlags::Default, ocStatus); + + AutoFrameListPtr prevOverflowFrames(PresContext(), + prevInFlow->StealOverflowFrames()); + if (prevOverflowFrames) { + nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow, + this); + mFrames.InsertFrames(this, nullptr, std::move(*prevOverflowFrames)); + } + } + + bool reflowInner; + bool reflowLegend; + nsIFrame* legend = GetLegend(); + nsContainerFrame* inner = GetInner(); + if (!legend || !inner) { + if (DrainSelfOverflowList()) { + legend = GetLegend(); + inner = GetInner(); + } + } + if (aReflowInput.ShouldReflowAllKids() || GetNextInFlow() || + aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE) { + reflowInner = inner != nullptr; + reflowLegend = legend != nullptr; + } else { + reflowInner = inner && inner->IsSubtreeDirty(); + reflowLegend = legend && legend->IsSubtreeDirty(); + } + + // @note |this| frame applies borders but not any padding. Our anonymous + // inner frame applies the padding (but not borders). + const auto wm = GetWritingMode(); + auto skipSides = PreReflowBlockLevelLogicalSkipSides(); + LogicalMargin border = + aReflowInput.ComputedLogicalBorder(wm).ApplySkipSides(skipSides); + LogicalSize availSize(wm, aReflowInput.ComputedSize().ISize(wm), + aReflowInput.AvailableBSize()); + + // Figure out how big the legend is if there is one. + LogicalMargin legendMargin(wm); + Maybe<ReflowInput> legendReflowInput; + if (legend) { + const auto legendWM = legend->GetWritingMode(); + LogicalSize legendAvailSize = availSize.ConvertTo(legendWM, wm); + ComputeSizeFlags sizeFlags; + if (legend->StylePosition()->ISize(wm).IsAuto()) { + sizeFlags = ComputeSizeFlag::ShrinkWrap; + } + ReflowInput::InitFlags initFlags; // intentionally empty + StyleSizeOverrides sizeOverrides; // intentionally empty + legendReflowInput.emplace(aPresContext, aReflowInput, legend, + legendAvailSize, Nothing(), initFlags, + sizeOverrides, sizeFlags); + } + const bool avoidBreakInside = ShouldAvoidBreakInside(aReflowInput); + if (reflowLegend) { + ReflowOutput legendDesiredSize(aReflowInput); + + // We'll move the legend to its proper place later, so the position + // and containerSize passed here are unimportant. + const nsSize dummyContainerSize; + ReflowChild(legend, aPresContext, legendDesiredSize, *legendReflowInput, wm, + LogicalPoint(wm), dummyContainerSize, + ReflowChildFlags::NoMoveFrame, aStatus); + + if (aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE && + !(HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) && + aReflowInput.mStyleDisplay->IsAbsolutelyPositionedStyle()) && + !prevInFlow && !aReflowInput.mFlags.mIsTopOfPage) { + // Propagate break-before from the legend to the fieldset. + if (legend->StyleDisplay()->BreakBefore() || + aStatus.IsInlineBreakBefore()) { + aStatus.SetInlineLineBreakBeforeAndReset(); + return; + } + // Honor break-inside:avoid by breaking before instead. + if (MOZ_UNLIKELY(avoidBreakInside) && !aStatus.IsFullyComplete()) { + aStatus.SetInlineLineBreakBeforeAndReset(); + return; + } + } + + // Calculate the legend's margin-box rectangle. + legendMargin = legend->GetLogicalUsedMargin(wm); + mLegendRect = LogicalRect( + wm, 0, 0, legendDesiredSize.ISize(wm) + legendMargin.IStartEnd(wm), + legendDesiredSize.BSize(wm) + legendMargin.BStartEnd(wm)); + // We subtract mLegendSpace from inner's content-box block-size below. + nscoord oldSpace = mLegendSpace; + mLegendSpace = 0; + nscoord borderBStart = border.BStart(wm); + if (!prevInFlow) { + if (mLegendRect.BSize(wm) > borderBStart) { + mLegendSpace = mLegendRect.BSize(wm) - borderBStart; + } else { + // Calculate the border-box position that would center the legend's + // border-box within the fieldset border: + nscoord off = (borderBStart - legendDesiredSize.BSize(wm)) / 2; + off -= legendMargin.BStart(wm); // convert to a margin-box position + if (off > nscoord(0)) { + // Align the legend to the end if center-aligning it would overflow. + nscoord overflow = off + mLegendRect.BSize(wm) - borderBStart; + if (overflow > nscoord(0)) { + off -= overflow; + } + mLegendRect.BStart(wm) += off; + } + } + } else { + mLegendSpace = mLegendRect.BSize(wm); + } + + // If mLegendSpace changes then we need to reflow |inner| as well. + if (mLegendSpace != oldSpace && inner) { + reflowInner = true; + } + + FinishReflowChild(legend, aPresContext, legendDesiredSize, + legendReflowInput.ptr(), wm, LogicalPoint(wm), + dummyContainerSize, ReflowChildFlags::NoMoveFrame); + EnsureChildContinuation(legend, aStatus); + if (aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE && + !legend->GetWritingMode().IsOrthogonalTo(wm) && + legend->StyleDisplay()->BreakAfter() && + (!legendReflowInput->mFlags.mIsTopOfPage || + mLegendRect.BSize(wm) > 0) && + aStatus.IsComplete()) { + // Pretend that we ran out of space to push children of |inner|. + // XXX(mats) perhaps pushing the inner frame would be more correct, + // but we don't support that yet. + availSize.BSize(wm) = nscoord(0); + aStatus.Reset(); + aStatus.SetIncomplete(); + } + } else if (!legend) { + mLegendRect.SetEmpty(); + mLegendSpace = 0; + } else { + // mLegendSpace and mLegendRect haven't changed, but we need + // the used margin when placing the legend. + legendMargin = legend->GetLogicalUsedMargin(wm); + } + + // This containerSize is incomplete as yet: it does not include the size + // of the |inner| frame itself. + nsSize containerSize = + (LogicalSize(wm, 0, mLegendSpace) + border.Size(wm)).GetPhysicalSize(wm); + if (reflowInner) { + LogicalSize innerAvailSize = availSize; + innerAvailSize.ISize(wm) = + aReflowInput.ComputedSizeWithPadding(wm).ISize(wm); + nscoord remainingComputedBSize = aReflowInput.ComputedBSize(); + if (prevInFlow && remainingComputedBSize != NS_UNCONSTRAINEDSIZE) { + // Subtract the consumed BSize associated with the legend. + for (nsIFrame* prev = prevInFlow; prev; prev = prev->GetPrevInFlow()) { + auto* prevFieldSet = static_cast<nsFieldSetFrame*>(prev); + remainingComputedBSize -= prevFieldSet->mLegendSpace; + } + remainingComputedBSize = std::max(0, remainingComputedBSize); + } + if (innerAvailSize.BSize(wm) != NS_UNCONSTRAINEDSIZE) { + innerAvailSize.BSize(wm) -= + std::max(mLegendRect.BSize(wm), border.BStart(wm)); + if (StyleBorder()->mBoxDecorationBreak == + StyleBoxDecorationBreak::Clone && + (aReflowInput.ComputedBSize() == NS_UNCONSTRAINEDSIZE || + remainingComputedBSize + + aReflowInput.ComputedLogicalBorderPadding(wm).BStartEnd( + wm) >= + availSize.BSize(wm))) { + innerAvailSize.BSize(wm) -= border.BEnd(wm); + } + innerAvailSize.BSize(wm) = std::max(0, innerAvailSize.BSize(wm)); + } + ReflowInput kidReflowInput(aPresContext, aReflowInput, inner, + innerAvailSize, Nothing(), + ReflowInput::InitFlag::CallerWillInit); + // Override computed padding, in case it's percentage padding + kidReflowInput.Init( + aPresContext, Nothing(), Nothing(), + Some(aReflowInput.ComputedLogicalPadding(inner->GetWritingMode()))); + + // Propagate the aspect-ratio flag to |inner| (i.e. the container frame + // wrapped by nsFieldSetFrame), so we can let |inner|'s reflow code handle + // automatic content-based minimum. + // Note: Init() resets this flag, so we have to copy it again here. + if (aReflowInput.mFlags.mIsBSizeSetByAspectRatio) { + kidReflowInput.mFlags.mIsBSizeSetByAspectRatio = true; + } + + if (kidReflowInput.mFlags.mIsTopOfPage) { + // Prevent break-before from |inner| if we have a legend. + kidReflowInput.mFlags.mIsTopOfPage = !legend; + } + // Our child is "height:100%" but we actually want its height to be reduced + // by the amount of content-height the legend is eating up, unless our + // height is unconstrained (in which case the child's will be too). + if (aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE) { + kidReflowInput.SetComputedBSize( + std::max(0, remainingComputedBSize - mLegendSpace)); + } + + if (aReflowInput.ComputedMinBSize() > 0) { + kidReflowInput.SetComputedMinBSize( + std::max(0, aReflowInput.ComputedMinBSize() - mLegendSpace)); + } + + if (aReflowInput.ComputedMaxBSize() != NS_UNCONSTRAINEDSIZE) { + kidReflowInput.SetComputedMaxBSize( + std::max(0, aReflowInput.ComputedMaxBSize() - mLegendSpace)); + } + + ReflowOutput kidDesiredSize(kidReflowInput); + NS_ASSERTION( + kidReflowInput.ComputedPhysicalMargin() == nsMargin(0, 0, 0, 0), + "Margins on anonymous fieldset child not supported!"); + LogicalPoint pt(wm, border.IStart(wm), border.BStart(wm) + mLegendSpace); + + // We don't know the correct containerSize until we have reflowed |inner|, + // so we use a dummy value for now; FinishReflowChild will fix the position + // if necessary. + const nsSize dummyContainerSize; + nsReflowStatus status; + // If our legend needs a continuation then *this* frame will have + // a continuation as well so we should keep our inner frame continuations + // too (even if 'inner' ends up being COMPLETE here). This ensures that + // our continuation will have a reasonable inline-size. + ReflowChildFlags flags = aStatus.IsFullyComplete() + ? ReflowChildFlags::Default + : ReflowChildFlags::NoDeleteNextInFlowChild; + ReflowChild(inner, aPresContext, kidDesiredSize, kidReflowInput, wm, pt, + dummyContainerSize, flags, status); + + // Honor break-inside:avoid when possible by returning a BreakBefore status. + if (MOZ_UNLIKELY(avoidBreakInside) && !prevInFlow && + !aReflowInput.mFlags.mIsTopOfPage && + availSize.BSize(wm) != NS_UNCONSTRAINEDSIZE) { + if (status.IsInlineBreakBefore() || !status.IsFullyComplete()) { + aStatus.SetInlineLineBreakBeforeAndReset(); + return; + } + } + + // Update containerSize to account for size of the inner frame, so that + // FinishReflowChild can position it correctly. + containerSize += kidDesiredSize.PhysicalSize(); + FinishReflowChild(inner, aPresContext, kidDesiredSize, &kidReflowInput, wm, + pt, containerSize, ReflowChildFlags::Default); + EnsureChildContinuation(inner, status); + aStatus.MergeCompletionStatusFrom(status); + NS_FRAME_TRACE_REFLOW_OUT("FieldSet::Reflow", aStatus); + } else if (inner) { + // |inner| didn't need to be reflowed but we do need to include its size + // in containerSize. + containerSize += inner->GetSize(); + } else { + // No |inner| means it was already complete in an earlier continuation. + MOZ_ASSERT(prevInFlow, "first-in-flow should always have an inner frame"); + for (nsIFrame* prev = prevInFlow; prev; prev = prev->GetPrevInFlow()) { + auto* prevFieldSet = static_cast<nsFieldSetFrame*>(prev); + if (auto* prevInner = prevFieldSet->GetInner()) { + containerSize += prevInner->GetSize(); + break; + } + } + } + + LogicalRect contentRect(wm); + if (inner) { + // We don't support margins on inner, so our content rect is just the + // inner's border-box. (We don't really care about container size at this + // point, as we'll figure out the actual positioning later.) + contentRect = inner->GetLogicalRect(wm, containerSize); + } else if (prevInFlow) { + auto size = prevInFlow->GetPaddingRectRelativeToSelf().Size(); + contentRect.ISize(wm) = wm.IsVertical() ? size.height : size.width; + } + + if (legend) { + // The legend is positioned inline-wards within the inner's content rect + // (so that padding on the fieldset affects the legend position). + LogicalRect innerContentRect = contentRect; + innerContentRect.Deflate(wm, aReflowInput.ComputedLogicalPadding(wm)); + // If the inner content rect is larger than the legend, we can align the + // legend. + if (innerContentRect.ISize(wm) > mLegendRect.ISize(wm)) { + // NOTE legend @align values are: left/right/center + // GetLogicalAlign converts left/right to start/end for the given WM. + // @see HTMLLegendElement::ParseAttribute/LogicalAlign + auto* legendElement = + dom::HTMLLegendElement::FromNode(legend->GetContent()); + switch (legendElement->LogicalAlign(wm)) { + case LegendAlignValue::InlineEnd: + mLegendRect.IStart(wm) = + innerContentRect.IEnd(wm) - mLegendRect.ISize(wm); + break; + case LegendAlignValue::Center: + // Note: rounding removed; there doesn't seem to be any need + mLegendRect.IStart(wm) = + innerContentRect.IStart(wm) + + (innerContentRect.ISize(wm) - mLegendRect.ISize(wm)) / 2; + break; + case LegendAlignValue::InlineStart: + mLegendRect.IStart(wm) = innerContentRect.IStart(wm); + break; + default: + MOZ_ASSERT_UNREACHABLE("unexpected GetLogicalAlign value"); + } + } else { + // otherwise just start-align it. + mLegendRect.IStart(wm) = innerContentRect.IStart(wm); + } + + // place the legend + LogicalRect actualLegendRect = mLegendRect; + actualLegendRect.Deflate(wm, legendMargin); + LogicalPoint actualLegendPos(actualLegendRect.Origin(wm)); + + // Note that legend's writing mode may be different from the fieldset's, + // so we need to convert offsets before applying them to it (bug 1134534). + LogicalMargin offsets = legendReflowInput->ComputedLogicalOffsets(wm); + ReflowInput::ApplyRelativePositioning(legend, wm, offsets, &actualLegendPos, + containerSize); + + legend->SetPosition(wm, actualLegendPos, containerSize); + nsContainerFrame::PositionFrameView(legend); + nsContainerFrame::PositionChildViews(legend); + } + + // Skip our block-end border if we're INCOMPLETE. + if (!aStatus.IsComplete() && + StyleBorder()->mBoxDecorationBreak != StyleBoxDecorationBreak::Clone) { + border.BEnd(wm) = nscoord(0); + } + + // Return our size and our result. + LogicalSize finalSize( + wm, contentRect.ISize(wm) + border.IStartEnd(wm), + mLegendSpace + border.BStartEnd(wm) + (inner ? inner->BSize(wm) : 0)); + if (Maybe<nscoord> containBSize = + aReflowInput.mFrame->ContainIntrinsicBSize()) { + // If we're size-contained in block axis, then we must set finalSize + // according to contain-intrinsic-block-size, disregarding legend and inner. + // Note: normally the fieldset's own padding (which we still must honor) + // would be accounted for as part of inner's size (see kidReflowInput.Init() + // call above). So: since we're disregarding sizing information from + // 'inner', we need to account for that padding ourselves here. + nscoord contentBoxBSize = + aReflowInput.ComputedBSize() == NS_UNCONSTRAINEDSIZE + ? aReflowInput.ApplyMinMaxBSize(*containBSize) + : aReflowInput.ComputedBSize(); + finalSize.BSize(wm) = + contentBoxBSize + + aReflowInput.ComputedLogicalBorderPadding(wm).BStartEnd(wm); + } + + if (aStatus.IsComplete() && + aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE && + finalSize.BSize(wm) > aReflowInput.AvailableBSize() && + border.BEnd(wm) > 0 && aReflowInput.AvailableBSize() > border.BEnd(wm)) { + // Our end border doesn't fit but it should fit in the next column/page. + if (MOZ_UNLIKELY(avoidBreakInside)) { + aStatus.SetInlineLineBreakBeforeAndReset(); + return; + } else { + if (StyleBorder()->mBoxDecorationBreak == + StyleBoxDecorationBreak::Slice) { + finalSize.BSize(wm) -= border.BEnd(wm); + } + aStatus.SetIncomplete(); + } + } + + if (!aStatus.IsComplete()) { + MOZ_ASSERT(aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE, + "must be Complete in an unconstrained available block-size"); + // Stretch our BSize to fill the fragmentainer. + finalSize.BSize(wm) = + std::max(finalSize.BSize(wm), aReflowInput.AvailableBSize()); + } + aDesiredSize.SetSize(wm, finalSize); + aDesiredSize.SetOverflowAreasToDesiredBounds(); + + if (legend) { + ConsiderChildOverflow(aDesiredSize.mOverflowAreas, legend); + } + if (inner) { + ConsiderChildOverflow(aDesiredSize.mOverflowAreas, inner); + } + + // Merge overflow container bounds and status. + aDesiredSize.mOverflowAreas.UnionWith(ocBounds); + aStatus.MergeCompletionStatusFrom(ocStatus); + + FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, aReflowInput, + aStatus); + InvalidateFrame(); +} + +void nsFieldSetFrame::SetInitialChildList(ChildListID aListID, + nsFrameList&& aChildList) { + nsContainerFrame::SetInitialChildList(aListID, std::move(aChildList)); + if (nsBlockFrame* legend = do_QueryFrame(GetLegend())) { + // A rendered legend always establish a new formatting context. + // https://html.spec.whatwg.org/multipage/rendering.html#rendered-legend + legend->AddStateBits(NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS); + } + MOZ_ASSERT( + aListID != FrameChildListID::Principal || GetInner() || GetLegend(), + "Setting principal child list should populate our inner frame " + "or our rendered legend"); +} + +void nsFieldSetFrame::AppendFrames(ChildListID aListID, + nsFrameList&& aFrameList) { + MOZ_ASSERT(aListID == FrameChildListID::NoReflowPrincipal && + HasAnyStateBits(NS_FRAME_FIRST_REFLOW), + "AppendFrames should only be used from " + "nsCSSFrameConstructor::ConstructFieldSetFrame"); + nsContainerFrame::AppendFrames(aListID, std::move(aFrameList)); + MOZ_ASSERT(GetInner(), "at this point we should have an inner frame"); +} + +void nsFieldSetFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, + const nsLineList::iterator* aPrevFrameLine, + nsFrameList&& aFrameList) { + MOZ_ASSERT( + aListID == FrameChildListID::Principal && !aPrevFrame && !GetLegend(), + "InsertFrames should only be used to prepend a rendered legend " + "from nsCSSFrameConstructor::ConstructFramesFromItemList"); + nsContainerFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine, + std::move(aFrameList)); + MOZ_ASSERT(GetLegend()); + if (nsBlockFrame* legend = do_QueryFrame(GetLegend())) { + // A rendered legend always establish a new formatting context. + // https://html.spec.whatwg.org/multipage/rendering.html#rendered-legend + legend->AddStateBits(NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS); + } +} + +#ifdef DEBUG +void nsFieldSetFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) { + MOZ_CRASH("nsFieldSetFrame::RemoveFrame not supported"); +} +#endif + +#ifdef ACCESSIBILITY +a11y::AccType nsFieldSetFrame::AccessibleType() { + return a11y::eHTMLGroupboxType; +} +#endif + +nscoord nsFieldSetFrame::GetLogicalBaseline(WritingMode aWM) const { + switch (StyleDisplay()->DisplayInside()) { + case mozilla::StyleDisplayInside::Grid: + case mozilla::StyleDisplayInside::Flex: + return BaselineBOffset(aWM, BaselineSharingGroup::First, + AlignmentContext::Inline); + default: + return BSize(aWM) - BaselineBOffset(aWM, BaselineSharingGroup::Last, + AlignmentContext::Inline); + } +} + +bool nsFieldSetFrame::GetVerticalAlignBaseline(WritingMode aWM, + nscoord* aBaseline) const { + if (StyleDisplay()->IsContainLayout()) { + // If we are layout-contained, our child 'inner' should not + // affect how we calculate our baseline. + return false; + } + nsIFrame* inner = GetInner(); + if (MOZ_UNLIKELY(!inner)) { + return false; + } + MOZ_ASSERT(!inner->GetWritingMode().IsOrthogonalTo(aWM)); + if (!inner->GetVerticalAlignBaseline(aWM, aBaseline)) { + return false; + } + nscoord innerBStart = inner->BStart(aWM, GetSize()); + *aBaseline += innerBStart; + return true; +} + +bool nsFieldSetFrame::GetNaturalBaselineBOffset( + WritingMode aWM, BaselineSharingGroup aBaselineGroup, + nscoord* aBaseline) const { + if (StyleDisplay()->IsContainLayout()) { + // If we are layout-contained, our child 'inner' should not + // affect how we calculate our baseline. + return false; + } + nsIFrame* inner = GetInner(); + if (MOZ_UNLIKELY(!inner)) { + return false; + } + MOZ_ASSERT(!inner->GetWritingMode().IsOrthogonalTo(aWM)); + if (!inner->GetNaturalBaselineBOffset(aWM, aBaselineGroup, aBaseline)) { + return false; + } + nscoord innerBStart = inner->BStart(aWM, GetSize()); + if (aBaselineGroup == BaselineSharingGroup::First) { + *aBaseline += innerBStart; + } else { + *aBaseline += BSize(aWM) - (innerBStart + inner->BSize(aWM)); + } + return true; +} + +nsIScrollableFrame* nsFieldSetFrame::GetScrollTargetFrame() const { + return do_QueryFrame(GetInner()); +} + +void nsFieldSetFrame::AppendDirectlyOwnedAnonBoxes( + nsTArray<OwnedAnonBox>& aResult) { + if (nsIFrame* kid = GetInner()) { + aResult.AppendElement(OwnedAnonBox(kid)); + } +} + +void nsFieldSetFrame::EnsureChildContinuation(nsIFrame* aChild, + const nsReflowStatus& aStatus) { + MOZ_ASSERT(aChild == GetLegend() || aChild == GetInner(), + "unexpected child frame"); + nsIFrame* nif = aChild->GetNextInFlow(); + if (aStatus.IsFullyComplete()) { + if (nif) { + // NOTE: we want to avoid our DEBUG version of RemoveFrame above. + nsContainerFrame::RemoveFrame(FrameChildListID::NoReflowPrincipal, nif); + MOZ_ASSERT(!aChild->GetNextInFlow()); + } + } else { + nsFrameList nifs; + if (!nif) { + auto* fc = PresShell()->FrameConstructor(); + nif = fc->CreateContinuingFrame(aChild, this); + if (aStatus.IsOverflowIncomplete()) { + nif->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER); + } + nifs = nsFrameList(nif, nif); + } else { + // Steal all nifs and push them again in case they are currently on + // the wrong list. + for (nsIFrame* n = nif; n; n = n->GetNextInFlow()) { + n->GetParent()->StealFrame(n); + nifs.AppendFrame(this, n); + if (aStatus.IsOverflowIncomplete()) { + n->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER); + } else { + n->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER); + } + } + } + if (aStatus.IsOverflowIncomplete()) { + if (nsFrameList* eoc = GetExcessOverflowContainers()) { + eoc->AppendFrames(nullptr, std::move(nifs)); + } else { + SetExcessOverflowContainers(std::move(nifs)); + } + } else { + if (nsFrameList* oc = GetOverflowFrames()) { + oc->AppendFrames(nullptr, std::move(nifs)); + } else { + SetOverflowFrames(std::move(nifs)); + } + } + } +} |