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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "OrderIterator.h"
#include "RenderBlock.h"
namespace WebCore {
class FlexItem;
class RenderFlexibleBox : public RenderBlock {
WTF_MAKE_ISO_ALLOCATED(RenderFlexibleBox);
public:
RenderFlexibleBox(Element&, RenderStyle&&);
RenderFlexibleBox(Document&, RenderStyle&&);
virtual ~RenderFlexibleBox();
bool isFlexibleBox() const override { return true; }
const char* renderName() const override;
bool avoidsFloats() const final { return true; }
bool canDropAnonymousBlockChild() const final { return false; }
void layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight = 0_lu) final;
LayoutUnit baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
std::optional<LayoutUnit> firstLineBaseline() const override;
std::optional<LayoutUnit> inlineBlockBaseline(LineDirectionMode) const override;
void styleDidChange(StyleDifference, const RenderStyle*) override;
bool hitTestChildren(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint& adjustedLocation, HitTestAction) override;
void paintChildren(PaintInfo& forSelf, const LayoutPoint&, PaintInfo& forChild, bool usePrintRect) override;
bool isHorizontalFlow() const;
const OrderIterator& orderIterator() const { return m_orderIterator; }
bool isTopLayoutOverflowAllowed() const override;
bool isLeftLayoutOverflowAllowed() const override;
virtual bool isFlexibleBoxImpl() const { return false; };
bool useChildOverridingLogicalHeightForPercentageResolution(const RenderBox&);
void clearCachedMainSizeForChild(const RenderBox& child);
LayoutUnit cachedChildIntrinsicContentLogicalHeight(const RenderBox& child) const;
void setCachedChildIntrinsicContentLogicalHeight(const RenderBox& child, LayoutUnit);
void clearCachedChildIntrinsicContentLogicalHeight(const RenderBox& child);
LayoutUnit staticMainAxisPositionForPositionedChild(const RenderBox&);
LayoutUnit staticCrossAxisPositionForPositionedChild(const RenderBox&);
LayoutUnit staticInlinePositionForPositionedChild(const RenderBox&);
LayoutUnit staticBlockPositionForPositionedChild(const RenderBox&);
// Returns true if the position changed. In that case, the child will have to
// be laid out again.
bool setStaticPositionForPositionedLayout(const RenderBox&);
protected:
void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
bool shouldResetChildLogicalHeightBeforeLayout(const RenderBox&) const override { return m_shouldResetChildLogicalHeightBeforeLayout; }
private:
enum FlexSign {
PositiveFlexibility,
NegativeFlexibility,
};
enum ChildLayoutType { LayoutIfNeeded, ForceLayout, NeverLayout };
enum class SizeDefiniteness { Definite, Indefinite, Unknown };
// Use an inline capacity of 8, since flexbox containers usually have less than 8 children.
typedef Vector<LayoutRect, 8> ChildFrameRects;
struct LineContext;
bool mainAxisIsChildInlineAxis(const RenderBox&) const;
bool isColumnFlow() const;
bool isColumnOrRowReverse() const;
bool isLeftToRightFlow() const;
bool isMultiline() const;
Length flexBasisForChild(const RenderBox& child) const;
Length mainSizeLengthForChild(SizeType, const RenderBox&) const;
Length crossSizeLengthForChild(SizeType, const RenderBox&) const;
bool shouldApplyMinSizeAutoForChild(const RenderBox&) const;
LayoutUnit crossAxisExtentForChild(const RenderBox& child) const;
LayoutUnit crossAxisIntrinsicExtentForChild(RenderBox& child);
LayoutUnit childIntrinsicLogicalHeight(RenderBox& child) const;
LayoutUnit childIntrinsicLogicalWidth(RenderBox& child);
LayoutUnit mainAxisExtentForChild(const RenderBox& child) const;
LayoutUnit mainAxisContentExtentForChildIncludingScrollbar(const RenderBox& child) const;
LayoutUnit crossAxisExtent() const;
LayoutUnit mainAxisExtent() const;
LayoutUnit crossAxisContentExtent() const;
LayoutUnit mainAxisContentExtent(LayoutUnit contentLogicalHeight);
std::optional<LayoutUnit> computeMainAxisExtentForChild(RenderBox& child, SizeType, const Length& size);
WritingMode transformedWritingMode() const;
LayoutUnit flowAwareBorderStart() const;
LayoutUnit flowAwareBorderEnd() const;
LayoutUnit flowAwareBorderBefore() const;
LayoutUnit flowAwareBorderAfter() const;
LayoutUnit flowAwarePaddingStart() const;
LayoutUnit flowAwarePaddingEnd() const;
LayoutUnit flowAwarePaddingBefore() const;
LayoutUnit flowAwarePaddingAfter() const;
LayoutUnit flowAwareMarginStartForChild(const RenderBox& child) const;
LayoutUnit flowAwareMarginEndForChild(const RenderBox& child) const;
LayoutUnit flowAwareMarginBeforeForChild(const RenderBox& child) const;
LayoutUnit crossAxisMarginExtentForChild(const RenderBox& child) const;
LayoutUnit mainAxisMarginExtentForChild(const RenderBox& child) const;
LayoutUnit crossAxisScrollbarExtent() const;
LayoutUnit crossAxisScrollbarExtentForChild(const RenderBox& child) const;
LayoutPoint flowAwareLocationForChild(const RenderBox& child) const;
bool childHasComputableAspectRatio(const RenderBox&) const;
bool childHasComputableAspectRatioAndCrossSizeIsConsideredDefinite(const RenderBox&);
bool crossAxisIsPhysicalWidth() const;
bool childCrossSizeShouldUseContainerCrossSize(const RenderBox& child) const;
LayoutUnit computeCrossSizeForChildUsingContainerCrossSize(const RenderBox& child) const;
void computeChildIntrinsicLogicalWidths(RenderObject&, LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
LayoutUnit computeMainSizeFromAspectRatioUsing(const RenderBox& child, Length crossSizeLength) const;
void setFlowAwareLocationForChild(RenderBox& child, const LayoutPoint&);
LayoutUnit computeFlexBaseSizeForChild(RenderBox& child, LayoutUnit mainAxisBorderAndPadding, bool relayoutChildren);
void maybeCacheChildMainIntrinsicSize(RenderBox& child, bool relayoutChildren);
void adjustAlignmentForChild(RenderBox& child, LayoutUnit);
ItemPosition alignmentForChild(const RenderBox& child) const;
bool canComputePercentageFlexBasis(const RenderBox& child, const Length& flexBasis, UpdatePercentageHeightDescendants);
bool childMainSizeIsDefinite(const RenderBox&, const Length& flexBasis);
bool childCrossSizeIsDefinite(const RenderBox&, const Length& flexBasis);
bool needToStretchChildLogicalHeight(const RenderBox& child) const;
bool childHasIntrinsicMainAxisSize(const RenderBox& child);
Overflow mainAxisOverflowForChild(const RenderBox& child) const;
Overflow crossAxisOverflowForChild(const RenderBox& child) const;
void cacheChildMainSize(const RenderBox& child);
bool useChildOverridingCrossSizeForPercentageResolution(const RenderBox&);
bool useChildOverridingMainSizeForPercentageResolution(const RenderBox&);
void layoutFlexItems(bool relayoutChildren);
LayoutUnit autoMarginOffsetInMainAxis(const Vector<FlexItem>&, LayoutUnit& availableFreeSpace);
void updateAutoMarginsInMainAxis(RenderBox& child, LayoutUnit autoMarginOffset);
bool hasAutoMarginsInCrossAxis(const RenderBox& child) const;
bool updateAutoMarginsInCrossAxis(RenderBox& child, LayoutUnit availableAlignmentSpace);
void repositionLogicalHeightDependentFlexItems(Vector<LineContext>&, LayoutUnit gapBetweenLines);
LayoutUnit availableAlignmentSpaceForChild(LayoutUnit lineCrossAxisExtent, const RenderBox& child);
LayoutUnit marginBoxAscentForChild(const RenderBox& child);
LayoutUnit computeChildMarginValue(Length margin);
void prepareOrderIteratorAndMargins();
std::pair<LayoutUnit, LayoutUnit> computeFlexItemMinMaxSizes(RenderBox& child);
LayoutUnit adjustChildSizeForAspectRatioCrossAxisMinAndMax(const RenderBox& child, LayoutUnit childSize);
FlexItem constructFlexItem(RenderBox&, bool relayoutChildren);
void freezeInflexibleItems(FlexSign, Vector<FlexItem>& children, LayoutUnit& remainingFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink);
bool resolveFlexibleLengths(FlexSign, Vector<FlexItem>&, LayoutUnit initialFreeSpace, LayoutUnit& remainingFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink);
void freezeViolations(Vector<FlexItem*>&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink);
void resetAutoMarginsAndLogicalTopInCrossAxis(RenderBox& child);
void setOverridingMainSizeForChild(RenderBox&, LayoutUnit);
void prepareChildForPositionedLayout(RenderBox& child);
void layoutAndPlaceChildren(LayoutUnit& crossAxisOffset, Vector<FlexItem>&, LayoutUnit availableFreeSpace, bool relayoutChildren, Vector<LineContext>&, LayoutUnit gapBetweenItems);
void layoutColumnReverse(const Vector<FlexItem>&, LayoutUnit crossAxisOffset, LayoutUnit availableFreeSpace, LayoutUnit gapBetweenItems);
void alignFlexLines(Vector<LineContext>&, LayoutUnit gapBetweenLines);
void alignChildren(const Vector<LineContext>&);
void applyStretchAlignmentToChild(RenderBox& child, LayoutUnit lineCrossAxisExtent);
void flipForRightToLeftColumn(const Vector<LineContext>& lineContexts);
void flipForWrapReverse(const Vector<LineContext>&, LayoutUnit crossAxisStartEdge);
void appendChildFrameRects(ChildFrameRects&);
void repaintChildrenDuringLayoutIfMoved(const ChildFrameRects&);
bool childHasPercentHeightDescendants(const RenderBox&) const;
void resetHasDefiniteHeight() { m_hasDefiniteHeight = SizeDefiniteness::Unknown; }
enum class GapType { BetweenLines, BetweenItems };
LayoutUnit computeGap(GapType) const;
// This is used to cache the preferred size for orthogonal flow children so we
// don't have to relayout to get it
HashMap<const RenderBox*, LayoutUnit> m_intrinsicSizeAlongMainAxis;
// This is used to cache the intrinsic size on the cross axis to avoid
// relayouts when stretching.
HashMap<const RenderBox*, LayoutUnit> m_intrinsicContentLogicalHeights;
// This set is used to keep track of which children we laid out in this
// current layout iteration. We need it because the ones in this set may
// need an additional layout pass for correct stretch alignment handling, as
// the first layout likely did not use the correct value for percentage
// sizing of children.
HashSet<const RenderBox*> m_relaidOutChildren;
mutable OrderIterator m_orderIterator { *this };
int m_numberOfInFlowChildrenOnFirstLine { -1 };
// This is SizeIsUnknown outside of layoutBlock()
SizeDefiniteness m_hasDefiniteHeight { SizeDefiniteness::Unknown };
bool m_inLayout { false };
bool m_shouldResetChildLogicalHeightBeforeLayout { false };
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderFlexibleBox, isFlexibleBox())