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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"
#include "RenderStyleInlines.h"
#include <wtf/WeakHashSet.h>
namespace WebCore {
class FlexLayoutItem;
namespace LayoutIntegration {
class FlexLayout;
}
class RenderFlexibleBox : public RenderBlock {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(RenderFlexibleBox);
WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(RenderFlexibleBox);
public:
RenderFlexibleBox(Type, Element&, RenderStyle&&);
RenderFlexibleBox(Type, Document&, RenderStyle&&);
virtual ~RenderFlexibleBox();
using Direction = FlowDirection;
ASCIILiteral renderName() const override;
bool canDropAnonymousBlockChild() const final { return false; }
void layoutBlock(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> lastLineBaseline() 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;
inline Direction crossAxisDirection() const
{
switch (writingMode().blockDirection()) {
case FlowDirection::TopToBottom:
if (style().isRowFlexDirection())
return (style().flexWrap() == FlexWrap::Reverse) ? Direction::BottomToTop : Direction::TopToBottom;
return (style().flexWrap() == FlexWrap::Reverse) ? Direction::RightToLeft : Direction::LeftToRight;
case FlowDirection::BottomToTop:
if (style().isRowFlexDirection())
return (style().flexWrap() == FlexWrap::Reverse) ? Direction::TopToBottom : Direction::BottomToTop;
return (style().flexWrap() == FlexWrap::Reverse) ? Direction::RightToLeft : Direction::LeftToRight;
case FlowDirection::LeftToRight:
if (style().isRowFlexDirection())
return (style().flexWrap() == FlexWrap::Reverse) ? Direction::RightToLeft : Direction::LeftToRight;
return (style().flexWrap() == FlexWrap::Reverse) ? Direction::BottomToTop : Direction::TopToBottom;
case FlowDirection::RightToLeft:
if (style().isRowFlexDirection())
return (style().flexWrap() == FlexWrap::Reverse) ? Direction::LeftToRight : Direction::RightToLeft;
return (style().flexWrap() == FlexWrap::Reverse) ? Direction::BottomToTop : Direction::TopToBottom;
default:
ASSERT_NOT_REACHED();
return Direction::TopToBottom;
}
}
const OrderIterator& orderIterator() const { return m_orderIterator; }
LayoutOptionalOutsets allowedLayoutOverflow() const override;
virtual bool isFlexibleBoxImpl() const { return false; };
std::optional<LayoutUnit> usedFlexItemOverridingLogicalHeightForPercentageResolution(const RenderBox&);
bool canUseFlexItemForPercentageResolution(const RenderBox&);
void clearCachedMainSizeForFlexItem(const RenderBox& flexItem);
LayoutUnit cachedFlexItemIntrinsicContentLogicalHeight(const RenderBox& flexItem) const;
void setCachedFlexItemIntrinsicContentLogicalHeight(const RenderBox& flexItem, LayoutUnit);
void clearCachedFlexItemIntrinsicContentLogicalHeight(const RenderBox& flexItem);
LayoutUnit staticMainAxisPositionForPositionedFlexItem(const RenderBox&);
LayoutUnit staticCrossAxisPositionForPositionedFlexItem(const RenderBox&);
LayoutUnit staticInlinePositionForPositionedFlexItem(const RenderBox&);
LayoutUnit staticBlockPositionForPositionedFlexItem(const RenderBox&);
// Returns true if the position changed. In that case, the flexItem will have to
// be laid out again.
bool setStaticPositionForPositionedLayout(const RenderBox&);
enum class GapType : uint8_t { BetweenLines, BetweenItems };
LayoutUnit computeGap(GapType) const;
bool shouldApplyMinBlockSizeAutoForFlexItem(const RenderBox&) const;
bool isComputingFlexBaseSizes() const { return m_isComputingFlexBaseSizes; }
static std::optional<TextDirection> leftRightAxisDirectionFromStyle(const RenderStyle&);
bool hasModernLayout() const { return m_hasFlexFormattingContextLayout && *m_hasFlexFormattingContextLayout; }
protected:
void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
bool shouldResetChildLogicalHeightBeforeLayout(const RenderBox&) const override { return m_shouldResetFlexItemLogicalHeightBeforeLayout; }
private:
friend class FlexLayoutAlgorithm;
enum class FlexSign : uint8_t {
PositiveFlexibility,
NegativeFlexibility,
};
enum class SizeDefiniteness : uint8_t { Definite, Indefinite, Unknown };
// Use an inline capacity of 8, since flexbox containers usually have less than 8 children.
typedef Vector<LayoutRect, 8> FlexItemFrameRects;
struct LineState;
using FlexLineStates = Vector<LineState>;
using FlexLayoutItems = Vector<FlexLayoutItem>;
bool mainAxisIsFlexItemInlineAxis(const RenderBox&) const;
bool isColumnFlow() const;
bool isColumnOrRowReverse() const;
bool isLeftToRightFlow() const;
bool isMultiline() const;
Length flexBasisForFlexItem(const RenderBox& flexItem) const;
Length mainSizeLengthForFlexItem(RenderBox::SizeType, const RenderBox&) const;
Length crossSizeLengthForFlexItem(RenderBox::SizeType, const RenderBox&) const;
bool shouldApplyMinSizeAutoForFlexItem(const RenderBox&) const;
LayoutUnit crossAxisExtentForFlexItem(const RenderBox& flexItem) const;
LayoutUnit crossAxisIntrinsicExtentForFlexItem(RenderBox& flexItem);
LayoutUnit flexItemIntrinsicLogicalHeight(RenderBox& flexItem) const;
LayoutUnit flexItemIntrinsicLogicalWidth(RenderBox& flexItem);
LayoutUnit mainAxisExtentForFlexItem(const RenderBox& flexItem) const;
LayoutUnit mainAxisContentExtentForFlexItemIncludingScrollbar(const RenderBox& flexItem) const;
LayoutUnit crossAxisExtent() const;
LayoutUnit mainAxisExtent() const;
LayoutUnit crossAxisContentExtent() const;
LayoutUnit mainAxisContentExtent(LayoutUnit contentLogicalHeight);
std::optional<LayoutUnit> computeMainAxisExtentForFlexItem(RenderBox& flexItem, RenderBox::SizeType, const Length& size);
FlowDirection transformedBlockFlowDirection() 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 flowAwareMarginStartForFlexItem(const RenderBox& flexItem) const;
LayoutUnit flowAwareMarginEndForFlexItem(const RenderBox& flexItem) const;
LayoutUnit flowAwareMarginBeforeForFlexItem(const RenderBox& flexItem) const;
LayoutUnit crossAxisMarginExtentForFlexItem(const RenderBox& flexItem) const;
LayoutUnit mainAxisMarginExtentForFlexItem(const RenderBox& flexItem) const;
LayoutUnit crossAxisScrollbarExtent() const;
LayoutUnit crossAxisScrollbarExtentForFlexItem(const RenderBox& flexItem) const;
LayoutPoint flowAwareLocationForFlexItem(const RenderBox& flexItem) const;
bool flexItemHasComputableAspectRatio(const RenderBox&) const;
bool flexItemHasComputableAspectRatioAndCrossSizeIsConsideredDefinite(const RenderBox&);
bool crossAxisIsLogicalWidth() const;
bool flexItemCrossSizeShouldUseContainerCrossSize(const RenderBox& flexItem) const;
LayoutUnit computeCrossSizeForFlexItemUsingContainerCrossSize(const RenderBox& flexItem) const;
void computeChildIntrinsicLogicalWidths(RenderBox&, LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
LayoutUnit computeMainSizeFromAspectRatioUsing(const RenderBox& flexItem, Length crossSizeLength) const;
void setFlowAwareLocationForFlexItem(RenderBox& flexItem, const LayoutPoint&);
LayoutUnit computeFlexBaseSizeForFlexItem(RenderBox& flexItem, LayoutUnit mainAxisBorderAndPadding, RelayoutChildren);
void maybeCacheFlexItemMainIntrinsicSize(RenderBox& flexItem, RelayoutChildren);
void adjustAlignmentForFlexItem(RenderBox& flexItem, LayoutUnit);
ItemPosition alignmentForFlexItem(const RenderBox& flexItem) const;
inline OverflowAlignment overflowAlignmentForFlexItem(const RenderBox& flexItem) const;
bool canComputePercentageFlexBasis(const RenderBox& flexItem, const Length& flexBasis, UpdatePercentageHeightDescendants);
bool flexItemMainSizeIsDefinite(const RenderBox&, const Length& flexBasis);
bool flexItemCrossSizeIsDefinite(const RenderBox&, const Length& flexBasis);
bool needToStretchFlexItemLogicalHeight(const RenderBox& flexItem) const;
bool flexItemHasIntrinsicMainAxisSize(const RenderBox& flexItem);
Overflow mainAxisOverflowForFlexItem(const RenderBox& flexItem) const;
Overflow crossAxisOverflowForFlexItem(const RenderBox& flexItem) const;
void cacheFlexItemMainSize(const RenderBox& flexItem);
void performFlexLayout(RelayoutChildren);
LayoutUnit autoMarginOffsetInMainAxis(const FlexLayoutItems&, LayoutUnit& availableFreeSpace);
void updateAutoMarginsInMainAxis(RenderBox& flexItem, LayoutUnit autoMarginOffset);
void initializeMarginTrimState();
// Start margin parallel with the cross axis
bool shouldTrimMainAxisMarginStart() const;
// End margin parallel with the cross axis
bool shouldTrimMainAxisMarginEnd() const;
// Margins parallel with the main axis
bool shouldTrimCrossAxisMarginStart() const;
bool shouldTrimCrossAxisMarginEnd() const;
void trimMainAxisMarginStart(const FlexLayoutItem&);
void trimMainAxisMarginEnd(const FlexLayoutItem&);
void trimCrossAxisMarginStart(const FlexLayoutItem&);
void trimCrossAxisMarginEnd(const FlexLayoutItem&);
bool isChildEligibleForMarginTrim(MarginTrimType, const RenderBox&) const final;
bool hasAutoMarginsInCrossAxis(const RenderBox& flexItem) const;
bool updateAutoMarginsInCrossAxis(RenderBox& flexItem, LayoutUnit availableAlignmentSpace);
void repositionLogicalHeightDependentFlexItems(FlexLineStates&, LayoutUnit gapBetweenLines);
LayoutUnit availableAlignmentSpaceForFlexItem(LayoutUnit lineCrossAxisExtent, const RenderBox& flexItem);
LayoutUnit marginBoxAscentForFlexItem(const RenderBox& flexItem);
LayoutUnit computeFlexItemMarginValue(Length margin);
void prepareOrderIteratorAndMargins();
std::pair<LayoutUnit, LayoutUnit> computeFlexItemMinMaxSizes(RenderBox& flexItem);
LayoutUnit adjustFlexItemSizeForAspectRatioCrossAxisMinAndMax(const RenderBox& flexItem, LayoutUnit flexItemSize);
FlexLayoutItem constructFlexLayoutItem(RenderBox&, RelayoutChildren);
void freezeInflexibleItems(FlexSign, FlexLayoutItems&, LayoutUnit& remainingFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink);
bool resolveFlexibleLengths(FlexSign, FlexLayoutItems&, LayoutUnit initialFreeSpace, LayoutUnit& remainingFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink);
void freezeViolations(Vector<FlexLayoutItem*>&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink);
void resetAutoMarginsAndLogicalTopInCrossAxis(RenderBox& flexItem);
void setOverridingMainSizeForFlexItem(RenderBox&, LayoutUnit);
void prepareFlexItemForPositionedLayout(RenderBox& flexItem);
void layoutAndPlaceFlexItems(LayoutUnit& crossAxisOffset, FlexLayoutItems&, LayoutUnit availableFreeSpace, RelayoutChildren, FlexLineStates&, LayoutUnit gapBetweenItems);
void layoutColumnReverse(const FlexLayoutItems&, LayoutUnit crossAxisOffset, LayoutUnit availableFreeSpace, LayoutUnit gapBetweenItems);
void alignFlexLines(FlexLineStates&, LayoutUnit gapBetweenLines);
void alignFlexItems(FlexLineStates&);
void applyStretchAlignmentToFlexItem(RenderBox& flexItem, LayoutUnit lineCrossAxisExtent);
void performBaselineAlignment(LineState&);
void flipForRightToLeftColumn(const FlexLineStates& linesState);
void flipForWrapReverse(const FlexLineStates&, LayoutUnit crossAxisStartEdge);
void appendFlexItemFrameRects(FlexItemFrameRects&);
void repaintFlexItemsDuringLayoutIfMoved(const FlexItemFrameRects&);
bool flexItemHasPercentHeightDescendants(const RenderBox&) const;
void resetHasDefiniteHeight() { m_hasDefiniteHeight = SizeDefiniteness::Unknown; }
const RenderBox* flexItemForFirstBaseline() const;
const RenderBox* flexItemForLastBaseline() const;
const RenderBox* firstBaselineCandidateOnLine(OrderIterator, ItemPosition baselinePosition, size_t numberOfItemsOnLine) const;
const RenderBox* lastBaselineCandidateOnLine(OrderIterator, ItemPosition baselinePosition, size_t numberOfItemsOnLine) const;
bool layoutUsingFlexFormattingContext();
// This is used to cache the preferred size for orthogonal flow children so we
// don't have to relayout to get it
UncheckedKeyHashMap<SingleThreadWeakRef<const RenderBox>, LayoutUnit> m_intrinsicSizeAlongMainAxis;
// This is used to cache the intrinsic size on the cross axis to avoid
// relayouts when stretching.
UncheckedKeyHashMap<SingleThreadWeakRef<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.
SingleThreadWeakHashSet<const RenderBox> m_relaidOutFlexItems;
mutable OrderIterator m_orderIterator { *this };
size_t m_numberOfFlexItemsOnFirstLine { 0 };
size_t m_numberOfFlexItemsOnLastLine { 0 };
struct MarginTrimItems {
SingleThreadWeakHashSet<const RenderBox> m_itemsAtFlexLineStart;
SingleThreadWeakHashSet<const RenderBox> m_itemsAtFlexLineEnd;
SingleThreadWeakHashSet<const RenderBox> m_itemsOnFirstFlexLine;
SingleThreadWeakHashSet<const RenderBox> m_itemsOnLastFlexLine;
} m_marginTrimItems;
LayoutUnit m_alignContentStartOverflow { 0 };
LayoutUnit m_justifyContentStartOverflow { 0 };
// This is SizeIsUnknown outside of layoutBlock()
SizeDefiniteness m_hasDefiniteHeight { SizeDefiniteness::Unknown };
bool m_inLayout { false };
bool m_inCrossAxisLayout { false };
bool m_inFlexItemLayout { false };
bool m_inSimplifiedLayout { false };
bool m_inPostFlexUpdateScrollbarLayout { false };
mutable bool m_inFlexItemIntrinsicWidthComputation { false };
bool m_shouldResetFlexItemLogicalHeightBeforeLayout { false };
bool m_isComputingFlexBaseSizes { false };
std::optional<bool> m_hasFlexFormattingContextLayout;
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderFlexibleBox, isRenderFlexibleBox())
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