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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.
*/
#ifndef LayoutFlexibleBox_h
#define LayoutFlexibleBox_h
#include "core/CoreExport.h"
#include "core/layout/LayoutBlock.h"
#include "core/layout/OrderIterator.h"
namespace blink {
class CORE_EXPORT LayoutFlexibleBox : public LayoutBlock {
public:
LayoutFlexibleBox(Element*);
~LayoutFlexibleBox() override;
static LayoutFlexibleBox* createAnonymous(Document*);
const char* name() const override { return "LayoutFlexibleBox"; }
bool isFlexibleBox() const final { return true; }
bool canCollapseAnonymousBlockChild() const override { return false; }
void layoutBlock(bool relayoutChildren) final;
int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
int firstLineBoxBaseline() const override;
int inlineBlockBaseline(LineDirectionMode) const override;
void paintChildren(const PaintInfo&, const LayoutPoint&) const final;
bool isHorizontalFlow() const;
const OrderIterator& orderIterator() const { return m_orderIterator; }
// Returns -1 if the height of this flexbox is indefinite
LayoutUnit computeDefiniteLogicalWidth();
LayoutUnit computeDefiniteLogicalHeight();
LayoutUnit crossSizeForPercentageResolution(const LayoutBox& child);
LayoutUnit mainSizeForPercentageResolution(const LayoutBox& child);
LayoutUnit childLogicalHeightForPercentageResolution(const LayoutBox& child);
LayoutUnit childLogicalWidthForPercentageResolution(const LayoutBox& child);
void clearCachedMainSizeForChild(const LayoutBox& child);
protected:
void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
void removeChild(LayoutObject*) override;
private:
enum FlexSign {
PositiveFlexibility,
NegativeFlexibility,
};
enum PositionedLayoutMode {
FlipForRowReverse,
NoFlipForRowReverse,
};
enum ChildLayoutType {
LayoutIfNeeded,
ForceLayout,
NeverLayout
};
enum class TransformedWritingMode {
TopToBottomWritingMode, RightToLeftWritingMode, LeftToRightWritingMode, BottomToTopWritingMode
};
typedef HashMap<const LayoutBox*, LayoutUnit> InflexibleFlexItemSize;
typedef Vector<LayoutBox*> OrderedFlexItemList;
struct LineContext;
struct Violation;
// Use an inline capacity of 8, since flexbox containers usually have less than 8 children.
typedef Vector<LayoutRect, 8> ChildFrameRects;
bool hasOrthogonalFlow(const LayoutBox& child) const;
bool isColumnFlow() const;
bool isLeftToRightFlow() const;
bool isMultiline() const;
Length flexBasisForChild(const LayoutBox& child) const;
LayoutUnit crossAxisExtentForChild(const LayoutBox& child) const;
LayoutUnit crossAxisIntrinsicExtentForChild(const LayoutBox& child) const;
LayoutUnit childIntrinsicHeight(const LayoutBox& child) const;
LayoutUnit childIntrinsicWidth(const LayoutBox& child) const;
LayoutUnit mainAxisExtentForChild(const LayoutBox& child) const;
LayoutUnit crossAxisExtent() const;
LayoutUnit mainAxisExtent() const;
LayoutUnit crossAxisContentExtent() const;
LayoutUnit mainAxisContentExtent(LayoutUnit contentLogicalHeight);
LayoutUnit computeMainAxisExtentForChild(const LayoutBox& child, SizeType, const Length& size);
TransformedWritingMode getTransformedWritingMode() 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 LayoutBox& child) const;
LayoutUnit flowAwareMarginEndForChild(const LayoutBox& child) const;
LayoutUnit flowAwareMarginBeforeForChild(const LayoutBox& child) const;
LayoutUnit crossAxisMarginExtentForChild(const LayoutBox& child) const;
LayoutUnit crossAxisScrollbarExtent() const;
LayoutUnit crossAxisScrollbarExtentForChild(const LayoutBox& child) const;
LayoutPoint flowAwareLocationForChild(const LayoutBox& child) const;
bool useChildAspectRatio(const LayoutBox& child) const;
LayoutUnit computeMainSizeFromAspectRatioUsing(const LayoutBox& child, Length crossSizeLength) const;
void setFlowAwareLocationForChild(LayoutBox& child, const LayoutPoint&);
void adjustAlignmentForChild(LayoutBox& child, LayoutUnit);
ItemPosition alignmentForChild(const LayoutBox& child) const;
LayoutUnit mainAxisBorderAndPaddingExtentForChild(const LayoutBox& child) const;
LayoutUnit computeInnerFlexBaseSizeForChild(LayoutBox& child, ChildLayoutType = LayoutIfNeeded);
bool mainAxisLengthIsDefinite(const LayoutBox& child, const Length& flexBasis) const;
bool crossAxisLengthIsDefinite(const LayoutBox& child, const Length& flexBasis) const;
bool childFlexBaseSizeRequiresLayout(const LayoutBox& child) const;
bool needToStretchChildLogicalHeight(const LayoutBox& child) const;
bool childHasIntrinsicMainAxisSize(const LayoutBox& child) const;
EOverflow mainAxisOverflowForChild(const LayoutBox& child) const;
EOverflow crossAxisOverflowForChild(const LayoutBox& child) const;
void cacheChildMainSize(const LayoutBox& child);
void layoutFlexItems(bool relayoutChildren, SubtreeLayoutScope&);
LayoutUnit autoMarginOffsetInMainAxis(const OrderedFlexItemList&, LayoutUnit& availableFreeSpace);
void updateAutoMarginsInMainAxis(LayoutBox& child, LayoutUnit autoMarginOffset);
bool hasAutoMarginsInCrossAxis(const LayoutBox& child) const;
bool updateAutoMarginsInCrossAxis(LayoutBox& child, LayoutUnit availableAlignmentSpace);
void repositionLogicalHeightDependentFlexItems(Vector<LineContext>&);
LayoutUnit clientLogicalBottomAfterRepositioning();
LayoutUnit availableAlignmentSpaceForChild(LayoutUnit lineCrossAxisExtent, const LayoutBox& child);
LayoutUnit availableAlignmentSpaceForChildBeforeStretching(LayoutUnit lineCrossAxisExtent, const LayoutBox& child);
LayoutUnit marginBoxAscentForChild(const LayoutBox& child);
LayoutUnit computeChildMarginValue(Length margin);
void prepareOrderIteratorAndMargins();
LayoutUnit adjustChildSizeForMinAndMax(const LayoutBox& child, LayoutUnit childSize);
LayoutUnit adjustChildSizeForAspectRatioCrossAxisMinAndMax(const LayoutBox& child, LayoutUnit childSize);
// The hypothetical main size of an item is the flex base size clamped according to its min and max main size properties
bool computeNextFlexLine(OrderedFlexItemList& orderedChildren, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize, bool relayoutChildren);
bool resolveFlexibleLengths(FlexSign, const OrderedFlexItemList&, LayoutUnit availableFreeSpace, LayoutUnit& remainingFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, InflexibleFlexItemSize&, Vector<LayoutUnit, 16>& childSizes);
void freezeViolations(const Vector<Violation>&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, InflexibleFlexItemSize&);
void resetAutoMarginsAndLogicalTopInCrossAxis(LayoutBox& child);
void setOverrideMainAxisSizeForChild(LayoutBox& child, LayoutUnit childPreferredSize);
void prepareChildForPositionedLayout(LayoutBox& child, LayoutUnit mainAxisOffset, LayoutUnit crossAxisOffset, PositionedLayoutMode);
size_t numberOfInFlowPositionedChildren(const OrderedFlexItemList&) const;
void layoutAndPlaceChildren(LayoutUnit& crossAxisOffset, const OrderedFlexItemList&, const Vector<LayoutUnit, 16>& childSizes, LayoutUnit availableFreeSpace, bool relayoutChildren, SubtreeLayoutScope&, Vector<LineContext>&);
void layoutColumnReverse(const OrderedFlexItemList&, LayoutUnit crossAxisOffset, LayoutUnit availableFreeSpace);
void alignFlexLines(Vector<LineContext>&);
void alignChildren(const Vector<LineContext>&);
void applyStretchAlignmentToChild(LayoutBox& child, LayoutUnit lineCrossAxisExtent);
void flipForRightToLeftColumn();
void flipForWrapReverse(const Vector<LineContext>&, LayoutUnit crossAxisStartEdge);
float countIntrinsicSizeForAlgorithmChange(LayoutUnit maxPreferredWidth, LayoutBox* child, float previousMaxContentFlexFraction) 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 LayoutObject*, LayoutUnit> m_intrinsicSizeAlongMainAxis;
mutable OrderIterator m_orderIterator;
int m_numberOfInFlowChildrenOnFirstLine;
};
DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFlexibleBox, isFlexibleBox());
} // namespace blink
#endif // LayoutFlexibleBox_h
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