sky/engine/core/rendering/RenderBlock.h - external/github.com/flutter/engine - Git at Google

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #ifndef SKY_ENGINE_CORE_RENDERING_RENDERBLOCK_H_
 #define SKY_ENGINE_CORE_RENDERING_RENDERBLOCK_H_

 #include "sky/engine/core/rendering/GapRects.h"
 #include "sky/engine/core/rendering/RenderBox.h"
 #include "sky/engine/core/rendering/RenderLineBoxList.h"
 #include "sky/engine/core/rendering/RootInlineBox.h"
 #include "sky/engine/core/rendering/style/ShapeValue.h"
 #include "sky/engine/platform/text/TextBreakIterator.h"
 #include "sky/engine/platform/text/TextRun.h"
 #include "sky/engine/wtf/ListHashSet.h"
 #include "sky/engine/wtf/OwnPtr.h"

 namespace blink {

 class LineInfo;
 class LineLayoutState;
 struct PaintInfo;
 class RenderInline;
 class RenderText;
 class WordMeasurement;

 template <class Run> class BidiRunList;
 typedef WTF::ListHashSet<RenderBox*, 16> TrackedRendererListHashSet;
 typedef WTF::HashMap<const RenderBlock*, OwnPtr<TrackedRendererListHashSet> > TrackedDescendantsMap;
 typedef WTF::HashMap<const RenderBox*, OwnPtr<HashSet<RenderBlock*> > > TrackedContainerMap;
 typedef Vector<WordMeasurement, 64> WordMeasurements;

 enum ContainingBlockState { NewContainingBlock, SameContainingBlock };

 class RenderBlock : public RenderBox {
 public:
     virtual void destroy() override;
     friend class LineLayoutState;

 protected:
     explicit RenderBlock(ContainerNode*);
     virtual ~RenderBlock();

 public:
     RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
     RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }

     // If you have a RenderBlock, use firstChild or lastChild instead.
     void slowFirstChild() const = delete;
     void slowLastChild() const = delete;

     const RenderObjectChildList* children() const { return &m_children; }
     RenderObjectChildList* children() { return &m_children; }

     bool beingDestroyed() const { return m_beingDestroyed; }

     // These two functions are overridden for inline-block.
     virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override final;
     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;

     LayoutUnit minLineHeightForReplacedRenderer(bool isFirstLine, LayoutUnit replacedHeight) const;

 protected:
     RenderLineBoxList* lineBoxes() { return &m_lineBoxes; }

     InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); }
     InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); }

     RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); }
     RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); }

 public:
     // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderParagraph
     virtual void deleteLineBoxTree();

     virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) override;
     virtual void removeChild(RenderObject*) override;

     void insertPositionedObject(RenderBox*);
     static void removePositionedObject(RenderBox*);
     void removePositionedObjects(RenderBlock*, ContainingBlockState = SameContainingBlock);

     TrackedRendererListHashSet* positionedObjects() const;
     bool hasPositionedObjects() const
     {
         TrackedRendererListHashSet* objects = positionedObjects();
         return objects && !objects->isEmpty();
     }

     void addPercentHeightDescendant(RenderBox*);
     static void removePercentHeightDescendant(RenderBox*);
     static bool hasPercentHeightContainerMap();
     static bool hasPercentHeightDescendant(RenderBox*);
     static void clearPercentHeightDescendantsFrom(RenderBox*);
     static void removePercentHeightDescendantIfNeeded(RenderBox*);

     TrackedRendererListHashSet* percentHeightDescendants() const;
     bool hasPercentHeightDescendants() const
     {
         TrackedRendererListHashSet* descendants = percentHeightDescendants();
         return descendants && !descendants->isEmpty();
     }

     void setHasMarginBeforeQuirk(bool b) { m_hasMarginBeforeQuirk = b; }
     void setHasMarginAfterQuirk(bool b) { m_hasMarginAfterQuirk = b; }

     bool hasMarginBeforeQuirk() const { return m_hasMarginBeforeQuirk; }
     bool hasMarginAfterQuirk() const { return m_hasMarginAfterQuirk; }

     bool hasMarginBeforeQuirk(const RenderBox* child) const;
     bool hasMarginAfterQuirk(const RenderBox* child) const;

     void markPositionedObjectsForLayout();

     LayoutUnit textIndentOffset() const;

     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) override;

     // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
     virtual LayoutUnit availableLogicalWidth() const override final;

     LayoutUnit blockDirectionOffset(const LayoutSize& offsetFromBlock) const;
     LayoutUnit inlineDirectionOffset(const LayoutSize& offsetFromBlock) const;

     virtual bool shouldPaintSelectionGaps() const override final;
     LayoutRect logicalLeftSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
                                        RenderObject* selObj, LayoutUnit logicalLeft, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*);
     LayoutRect logicalRightSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
                                         RenderObject* selObj, LayoutUnit logicalRight, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*);
     void getSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap);
     RenderBlock* blockBeforeWithinSelectionRoot(LayoutSize& offset) const;

     virtual void setSelectionState(SelectionState) override;

     LayoutRect logicalRectToPhysicalRect(const LayoutPoint& physicalPosition, const LayoutRect& logicalRect);

     // Helper methods for computing line counts and heights for line counts.
     virtual RootInlineBox* lineAtIndex(int) const;
     virtual int lineCount(const RootInlineBox* = 0, bool* = 0) const;
     void clearTruncation();

     // Accessors for logical width/height and margins in the containing block's block-flow direction.
     LayoutUnit logicalWidthForChild(const RenderBox* child) const { return child->width(); }
     LayoutUnit logicalHeightForChild(const RenderBox* child) const { return child->height(); }
     LayoutSize logicalSizeForChild(const RenderBox* child) const { return child->size(); }
     LayoutUnit logicalTopForChild(const RenderBox* child) const { return child->y(); }
     LayoutUnit marginBeforeForChild(const RenderBoxModelObject* child) const { return child->marginBefore(style()); }
     LayoutUnit marginAfterForChild(const RenderBoxModelObject* child) const { return child->marginAfter(style()); }
     LayoutUnit marginStartForChild(const RenderBoxModelObject* child) const { return child->marginStart(style()); }
     LayoutUnit marginEndForChild(const RenderBoxModelObject* child) const { return child->marginEnd(style()); }
     void setMarginStartForChild(RenderBox* child, LayoutUnit value) const { child->setMarginStart(value, style()); }
     void setMarginEndForChild(RenderBox* child, LayoutUnit value) const { child->setMarginEnd(value, style()); }
     void setMarginBeforeForChild(RenderBox* child, LayoutUnit value) const { child->setMarginBefore(value, style()); }
     void setMarginAfterForChild(RenderBox* child, LayoutUnit value) const { child->setMarginAfter(value, style()); }
     LayoutUnit marginBeforeForChild(const RenderBox* child) const;
     LayoutUnit marginAfterForChild(const RenderBox* child) const;

     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset) override;

     LayoutUnit availableLogicalWidthForContent() const { return max<LayoutUnit>(0, logicalRightOffsetForContent() - logicalLeftOffsetForContent()); }
     LayoutUnit logicalLeftOffsetForContent() const { return borderLeft() + paddingLeft(); }
     LayoutUnit logicalRightOffsetForContent() const { return logicalLeftOffsetForContent() + availableLogicalWidth(); }
     LayoutUnit startOffsetForContent() const { return style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
     LayoutUnit endOffsetForContent() const { return !style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }

 #if ENABLE(ASSERT)
     void checkPositionedObjectsNeedLayout();
 #endif
 #ifndef NDEBUG
     void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0) const;
 #endif

     bool recalcChildOverflowAfterStyleChange();
     bool recalcOverflowAfterStyleChange();

 protected:
     virtual void willBeDestroyed() override;

     void dirtyForLayoutFromPercentageHeightDescendants(SubtreeLayoutScope&);

     enum PositionedLayoutBehavior {
         DefaultLayout,
         ForcedLayoutAfterContainingBlockMoved
     };

     void layoutPositionedObjects(bool relayoutChildren, PositionedLayoutBehavior = DefaultLayout);

     LayoutUnit marginIntrinsicLogicalWidthForChild(RenderBox* child) const;

     int beforeMarginInLineDirection(LineDirectionMode) const;

     virtual void paint(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers) override;
     void paintObject(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers);
     virtual void paintChildren(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers);

     virtual void adjustInlineDirectionLineBounds(unsigned /* expansionOpportunityCount */, float& /* logicalLeft */, float& /* logicalWidth */) const { }

     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
     virtual void computePreferredLogicalWidths() override;

     virtual int firstLineBoxBaseline(FontBaselineOrAuto baselineType) const override;
     virtual int inlineBlockBaseline(LineDirectionMode) const override;
     virtual int lastLineBoxBaseline(LineDirectionMode) const;

     virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) override;

     virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;

     virtual bool hasLineIfEmpty() const;

     bool simplifiedLayout();
     virtual void simplifiedNormalFlowLayout();

 public:
     virtual void computeOverflow(LayoutUnit oldClientAfterEdge, bool = false);
 protected:
     virtual void addOverflowFromChildren();
     void addOverflowFromPositionedObjects();

     virtual void addFocusRingRects(Vector<IntRect>&, const LayoutPoint& additionalOffset, const RenderBox* paintContainer = 0) const override;

     void updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox*);

     virtual bool isInlineBlock() const override final { return isInline() && isReplaced(); }

     virtual bool hitTestContents(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset);

 private:
     virtual RenderObjectChildList* virtualChildren() override final { return children(); }
     virtual const RenderObjectChildList* virtualChildren() const override final { return children(); }

     virtual const char* renderName() const override;

     virtual bool isRenderBlock() const override final { return true; }

     virtual void dirtyLinesFromChangedChild(RenderObject* child) override final { m_lineBoxes.dirtyLinesFromChangedChild(this, child); }

     void insertIntoTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
     static void removeFromTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);

     void paintSelection(PaintInfo&, const LayoutPoint&);

     // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
     // children.
     virtual RenderBlock* firstLineBlock() const override;

     bool isSelectionRoot() const;
     GapRects selectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
                            LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* = 0);
     GapRects blockSelectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
                                 LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*);
     LayoutRect blockSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
                                  LayoutUnit lastLogicalTop, LayoutUnit lastLogicalLeft, LayoutUnit lastLogicalRight, LayoutUnit logicalBottom, const PaintInfo*);
     virtual LayoutUnit logicalLeftSelectionOffset(RenderBlock* rootBlock, LayoutUnit position);
     virtual LayoutUnit logicalRightSelectionOffset(RenderBlock* rootBlock, LayoutUnit position);

     virtual void absoluteQuads(Vector<FloatQuad>&) const override;

     virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) override final;

     Position positionForBox(InlineBox*, bool start = true) const;
     PositionWithAffinity positionForPointWithInlineChildren(const LayoutPoint&);

     void removeFromGlobalMaps();
     bool widthAvailableToChildrenHasChanged();

 protected:
     bool updateLogicalWidthAndColumnWidth();

     RenderObjectChildList m_children;
     RenderLineBoxList m_lineBoxes;   // All of the root line boxes created for this block flow.  For example, <div>Hello<br>world.</div> will have two total lines for the <div>.

     LayoutUnit m_pageLogicalOffset;

     unsigned m_hasMarginBeforeQuirk : 1; // Note these quirk values can't be put in RenderBlockRareData since they are set too frequently.
     unsigned m_hasMarginAfterQuirk : 1;
     unsigned m_beingDestroyed : 1;
     unsigned m_hasBorderOrPaddingLogicalWidthChanged : 1;

     // FIXME-BLOCKFLOW: Remove this when the line layout stuff has all moved out of RenderBlock
     friend class LineBreaker;

     // FIXME: This is temporary as we move code that accesses block flow
     // member variables out of RenderBlock and into RenderParagraph.
     friend class RenderParagraph;
 };

 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());

 } // namespace blink

 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERBLOCK_H_
	/*
	* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
	* (C) 1999 Antti Koivisto (koivisto@kde.org)
	* (C) 2007 David Smith (catfish.man@gmail.com)
	* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifndef SKY_ENGINE_CORE_RENDERING_RENDERBLOCK_H_
	#define SKY_ENGINE_CORE_RENDERING_RENDERBLOCK_H_

	#include "sky/engine/core/rendering/GapRects.h"
	#include "sky/engine/core/rendering/RenderBox.h"
	#include "sky/engine/core/rendering/RenderLineBoxList.h"
	#include "sky/engine/core/rendering/RootInlineBox.h"
	#include "sky/engine/core/rendering/style/ShapeValue.h"
	#include "sky/engine/platform/text/TextBreakIterator.h"
	#include "sky/engine/platform/text/TextRun.h"
	#include "sky/engine/wtf/ListHashSet.h"
	#include "sky/engine/wtf/OwnPtr.h"

	namespace blink {

	class LineInfo;
	class LineLayoutState;
	struct PaintInfo;
	class RenderInline;
	class RenderText;
	class WordMeasurement;

	template <class Run> class BidiRunList;
	typedef WTF::ListHashSet<RenderBox*, 16> TrackedRendererListHashSet;
	typedef WTF::HashMap<const RenderBlock*, OwnPtr<TrackedRendererListHashSet> > TrackedDescendantsMap;
	typedef WTF::HashMap<const RenderBox, OwnPtr<HashSet<RenderBlock> > > TrackedContainerMap;
	typedef Vector<WordMeasurement, 64> WordMeasurements;

	enum ContainingBlockState { NewContainingBlock, SameContainingBlock };

	class RenderBlock : public RenderBox {
	public:
	virtual void destroy() override;
	friend class LineLayoutState;

	protected:
	explicit RenderBlock(ContainerNode*);
	virtual ~RenderBlock();

	public:
	RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
	RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }

	// If you have a RenderBlock, use firstChild or lastChild instead.
	void slowFirstChild() const = delete;
	void slowLastChild() const = delete;

	const RenderObjectChildList* children() const { return &m_children; }
	RenderObjectChildList* children() { return &m_children; }

	bool beingDestroyed() const { return m_beingDestroyed; }

	// These two functions are overridden for inline-block.
	virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override final;
	virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;

	LayoutUnit minLineHeightForReplacedRenderer(bool isFirstLine, LayoutUnit replacedHeight) const;

	protected:
	RenderLineBoxList* lineBoxes() { return &m_lineBoxes; }

	InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); }
	InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); }

	RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); }
	RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); }

	public:
	// FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderParagraph
	virtual void deleteLineBoxTree();

	virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) override;
	virtual void removeChild(RenderObject*) override;

	void insertPositionedObject(RenderBox*);
	static void removePositionedObject(RenderBox*);
	void removePositionedObjects(RenderBlock*, ContainingBlockState = SameContainingBlock);

	TrackedRendererListHashSet* positionedObjects() const;
	bool hasPositionedObjects() const
	{
	TrackedRendererListHashSet* objects = positionedObjects();
	return objects && !objects->isEmpty();
	}

	void addPercentHeightDescendant(RenderBox*);
	static void removePercentHeightDescendant(RenderBox*);
	static bool hasPercentHeightContainerMap();
	static bool hasPercentHeightDescendant(RenderBox*);
	static void clearPercentHeightDescendantsFrom(RenderBox*);
	static void removePercentHeightDescendantIfNeeded(RenderBox*);

	TrackedRendererListHashSet* percentHeightDescendants() const;
	bool hasPercentHeightDescendants() const
	{
	TrackedRendererListHashSet* descendants = percentHeightDescendants();
	return descendants && !descendants->isEmpty();
	}

	void setHasMarginBeforeQuirk(bool b) { m_hasMarginBeforeQuirk = b; }
	void setHasMarginAfterQuirk(bool b) { m_hasMarginAfterQuirk = b; }

	bool hasMarginBeforeQuirk() const { return m_hasMarginBeforeQuirk; }
	bool hasMarginAfterQuirk() const { return m_hasMarginAfterQuirk; }

	bool hasMarginBeforeQuirk(const RenderBox* child) const;
	bool hasMarginAfterQuirk(const RenderBox* child) const;

	void markPositionedObjectsForLayout();

	LayoutUnit textIndentOffset() const;

	virtual PositionWithAffinity positionForPoint(const LayoutPoint&) override;

	// Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
	virtual LayoutUnit availableLogicalWidth() const override final;

	LayoutUnit blockDirectionOffset(const LayoutSize& offsetFromBlock) const;
	LayoutUnit inlineDirectionOffset(const LayoutSize& offsetFromBlock) const;

	virtual bool shouldPaintSelectionGaps() const override final;
	LayoutRect logicalLeftSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
	RenderObject* selObj, LayoutUnit logicalLeft, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*);
	LayoutRect logicalRightSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
	RenderObject* selObj, LayoutUnit logicalRight, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*);
	void getSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap);
	RenderBlock* blockBeforeWithinSelectionRoot(LayoutSize& offset) const;

	virtual void setSelectionState(SelectionState) override;

	LayoutRect logicalRectToPhysicalRect(const LayoutPoint& physicalPosition, const LayoutRect& logicalRect);

	// Helper methods for computing line counts and heights for line counts.
	virtual RootInlineBox* lineAtIndex(int) const;
	virtual int lineCount(const RootInlineBox* = 0, bool* = 0) const;
	void clearTruncation();

	// Accessors for logical width/height and margins in the containing block's block-flow direction.
	LayoutUnit logicalWidthForChild(const RenderBox* child) const { return child->width(); }
	LayoutUnit logicalHeightForChild(const RenderBox* child) const { return child->height(); }
	LayoutSize logicalSizeForChild(const RenderBox* child) const { return child->size(); }
	LayoutUnit logicalTopForChild(const RenderBox* child) const { return child->y(); }
	LayoutUnit marginBeforeForChild(const RenderBoxModelObject* child) const { return child->marginBefore(style()); }
	LayoutUnit marginAfterForChild(const RenderBoxModelObject* child) const { return child->marginAfter(style()); }
	LayoutUnit marginStartForChild(const RenderBoxModelObject* child) const { return child->marginStart(style()); }
	LayoutUnit marginEndForChild(const RenderBoxModelObject* child) const { return child->marginEnd(style()); }
	void setMarginStartForChild(RenderBox* child, LayoutUnit value) const { child->setMarginStart(value, style()); }
	void setMarginEndForChild(RenderBox* child, LayoutUnit value) const { child->setMarginEnd(value, style()); }
	void setMarginBeforeForChild(RenderBox* child, LayoutUnit value) const { child->setMarginBefore(value, style()); }
	void setMarginAfterForChild(RenderBox* child, LayoutUnit value) const { child->setMarginAfter(value, style()); }
	LayoutUnit marginBeforeForChild(const RenderBox* child) const;
	LayoutUnit marginAfterForChild(const RenderBox* child) const;

	virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset) override;

	LayoutUnit availableLogicalWidthForContent() const { return max<LayoutUnit>(0, logicalRightOffsetForContent() - logicalLeftOffsetForContent()); }
	LayoutUnit logicalLeftOffsetForContent() const { return borderLeft() + paddingLeft(); }
	LayoutUnit logicalRightOffsetForContent() const { return logicalLeftOffsetForContent() + availableLogicalWidth(); }
	LayoutUnit startOffsetForContent() const { return style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
	LayoutUnit endOffsetForContent() const { return !style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }

	#if ENABLE(ASSERT)
	void checkPositionedObjectsNeedLayout();
	#endif
	#ifndef NDEBUG
	void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0) const;
	#endif

	bool recalcChildOverflowAfterStyleChange();
	bool recalcOverflowAfterStyleChange();

	protected:
	virtual void willBeDestroyed() override;

	void dirtyForLayoutFromPercentageHeightDescendants(SubtreeLayoutScope&);

	enum PositionedLayoutBehavior {
	DefaultLayout,
	ForcedLayoutAfterContainingBlockMoved
	};

	void layoutPositionedObjects(bool relayoutChildren, PositionedLayoutBehavior = DefaultLayout);

	LayoutUnit marginIntrinsicLogicalWidthForChild(RenderBox* child) const;

	int beforeMarginInLineDirection(LineDirectionMode) const;

	virtual void paint(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers) override;
	void paintObject(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers);
	virtual void paintChildren(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers);

	virtual void adjustInlineDirectionLineBounds(unsigned /* expansionOpportunityCount /, float& / logicalLeft /, float& / logicalWidth */) const { }

	virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
	virtual void computePreferredLogicalWidths() override;

	virtual int firstLineBoxBaseline(FontBaselineOrAuto baselineType) const override;
	virtual int inlineBlockBaseline(LineDirectionMode) const override;
	virtual int lastLineBoxBaseline(LineDirectionMode) const;

	virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) override;

	virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
	virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;

	virtual bool hasLineIfEmpty() const;

	bool simplifiedLayout();
	virtual void simplifiedNormalFlowLayout();

	public:
	virtual void computeOverflow(LayoutUnit oldClientAfterEdge, bool = false);
	protected:
	virtual void addOverflowFromChildren();
	void addOverflowFromPositionedObjects();

	virtual void addFocusRingRects(Vector<IntRect>&, const LayoutPoint& additionalOffset, const RenderBox* paintContainer = 0) const override;

	void updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox*);

	virtual bool isInlineBlock() const override final { return isInline() && isReplaced(); }

	virtual bool hitTestContents(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset);

	private:
	virtual RenderObjectChildList* virtualChildren() override final { return children(); }
	virtual const RenderObjectChildList* virtualChildren() const override final { return children(); }

	virtual const char* renderName() const override;

	virtual bool isRenderBlock() const override final { return true; }

	virtual void dirtyLinesFromChangedChild(RenderObject* child) override final { m_lineBoxes.dirtyLinesFromChangedChild(this, child); }

	void insertIntoTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap&, TrackedContainerMap&);
	static void removeFromTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap&, TrackedContainerMap&);

	void paintSelection(PaintInfo&, const LayoutPoint&);

	// Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
	// children.
	virtual RenderBlock* firstLineBlock() const override;

	bool isSelectionRoot() const;
	GapRects selectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
	LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* = 0);
	GapRects blockSelectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
	LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*);
	LayoutRect blockSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
	LayoutUnit lastLogicalTop, LayoutUnit lastLogicalLeft, LayoutUnit lastLogicalRight, LayoutUnit logicalBottom, const PaintInfo*);
	virtual LayoutUnit logicalLeftSelectionOffset(RenderBlock* rootBlock, LayoutUnit position);
	virtual LayoutUnit logicalRightSelectionOffset(RenderBlock* rootBlock, LayoutUnit position);

	virtual void absoluteQuads(Vector<FloatQuad>&) const override;

	virtual LayoutRect localCaretRect(InlineBox, int caretOffset, LayoutUnit extraWidthToEndOfLine = 0) override final;

	Position positionForBox(InlineBox*, bool start = true) const;
	PositionWithAffinity positionForPointWithInlineChildren(const LayoutPoint&);

	void removeFromGlobalMaps();
	bool widthAvailableToChildrenHasChanged();

	protected:
	bool updateLogicalWidthAndColumnWidth();

	RenderObjectChildList m_children;
	RenderLineBoxList m_lineBoxes; // All of the root line boxes created for this block flow. For example, <div>Hello<br>world.</div> will have two total lines for the <div>.

	LayoutUnit m_pageLogicalOffset;

	unsigned m_hasMarginBeforeQuirk : 1; // Note these quirk values can't be put in RenderBlockRareData since they are set too frequently.
	unsigned m_hasMarginAfterQuirk : 1;
	unsigned m_beingDestroyed : 1;
	unsigned m_hasBorderOrPaddingLogicalWidthChanged : 1;

	// FIXME-BLOCKFLOW: Remove this when the line layout stuff has all moved out of RenderBlock
	friend class LineBreaker;

	// FIXME: This is temporary as we move code that accesses block flow
	// member variables out of RenderBlock and into RenderParagraph.
	friend class RenderParagraph;
	};

	DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());

	} // namespace blink

	#endif // SKY_ENGINE_CORE_RENDERING_RENDERBLOCK_H_