mirror of
https://github.com/flutter/flutter.git
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311 lines
16 KiB
C++
311 lines
16 KiB
C++
/*
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* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
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* (C) 1999 Antti Koivisto (koivisto@kde.org)
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* (C) 2007 David Smith (catfish.man@gmail.com)
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* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef SKY_ENGINE_CORE_RENDERING_RENDERBLOCK_H_
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#define SKY_ENGINE_CORE_RENDERING_RENDERBLOCK_H_
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#include "flutter/sky/engine/core/rendering/GapRects.h"
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#include "flutter/sky/engine/core/rendering/RenderBox.h"
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#include "flutter/sky/engine/core/rendering/RenderLineBoxList.h"
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#include "flutter/sky/engine/core/rendering/RootInlineBox.h"
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#include "flutter/sky/engine/core/rendering/style/ShapeValue.h"
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#include "flutter/sky/engine/platform/text/TextBreakIterator.h"
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#include "flutter/sky/engine/platform/text/TextRun.h"
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#include "flutter/sky/engine/wtf/ListHashSet.h"
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#include "flutter/sky/engine/wtf/OwnPtr.h"
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namespace blink {
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class LineInfo;
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class LineLayoutState;
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struct PaintInfo;
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class RenderInline;
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class RenderText;
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class WordMeasurement;
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template <class Run> class BidiRunList;
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typedef WTF::ListHashSet<RenderBox*, 16> TrackedRendererListHashSet;
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typedef WTF::HashMap<const RenderBlock*, OwnPtr<TrackedRendererListHashSet> > TrackedDescendantsMap;
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typedef WTF::HashMap<const RenderBox*, OwnPtr<HashSet<RenderBlock*> > > TrackedContainerMap;
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typedef Vector<WordMeasurement, 64> WordMeasurements;
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enum ContainingBlockState { NewContainingBlock, SameContainingBlock };
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class RenderBlock : public RenderBox {
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public:
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virtual void destroy() override;
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friend class LineLayoutState;
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protected:
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explicit RenderBlock();
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virtual ~RenderBlock();
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public:
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RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
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RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
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// If you have a RenderBlock, use firstChild or lastChild instead.
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void slowFirstChild() const = delete;
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void slowLastChild() const = delete;
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const RenderObjectChildList* children() const { return &m_children; }
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RenderObjectChildList* children() { return &m_children; }
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bool beingDestroyed() const { return m_beingDestroyed; }
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// These two functions are overridden for inline-block.
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virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override final;
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virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
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LayoutUnit minLineHeightForReplacedRenderer(bool isFirstLine, LayoutUnit replacedHeight) const;
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protected:
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RenderLineBoxList* lineBoxes() { return &m_lineBoxes; }
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InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); }
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InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); }
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RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); }
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RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); }
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public:
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// FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderParagraph
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virtual void deleteLineBoxTree();
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virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) override;
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virtual void removeChild(RenderObject*) override;
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void insertPositionedObject(RenderBox*);
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static void removePositionedObject(RenderBox*);
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void removePositionedObjects(RenderBlock*, ContainingBlockState = SameContainingBlock);
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TrackedRendererListHashSet* positionedObjects() const;
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bool hasPositionedObjects() const
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{
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TrackedRendererListHashSet* objects = positionedObjects();
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return objects && !objects->isEmpty();
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}
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void addPercentHeightDescendant(RenderBox*);
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static void removePercentHeightDescendant(RenderBox*);
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static bool hasPercentHeightContainerMap();
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static bool hasPercentHeightDescendant(RenderBox*);
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static void clearPercentHeightDescendantsFrom(RenderBox*);
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static void removePercentHeightDescendantIfNeeded(RenderBox*);
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TrackedRendererListHashSet* percentHeightDescendants() const;
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bool hasPercentHeightDescendants() const
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{
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TrackedRendererListHashSet* descendants = percentHeightDescendants();
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return descendants && !descendants->isEmpty();
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}
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void setHasMarginBeforeQuirk(bool b) { m_hasMarginBeforeQuirk = b; }
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void setHasMarginAfterQuirk(bool b) { m_hasMarginAfterQuirk = b; }
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bool hasMarginBeforeQuirk() const { return m_hasMarginBeforeQuirk; }
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bool hasMarginAfterQuirk() const { return m_hasMarginAfterQuirk; }
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bool hasMarginBeforeQuirk(const RenderBox* child) const;
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bool hasMarginAfterQuirk(const RenderBox* child) const;
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void markPositionedObjectsForLayout();
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LayoutUnit textIndentOffset() const;
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virtual PositionWithAffinity positionForPoint(const LayoutPoint&) override;
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// Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
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virtual LayoutUnit availableLogicalWidth() const override final;
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LayoutUnit blockDirectionOffset(const LayoutSize& offsetFromBlock) const;
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LayoutUnit inlineDirectionOffset(const LayoutSize& offsetFromBlock) const;
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virtual bool shouldPaintSelectionGaps() const override final;
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LayoutRect logicalLeftSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
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RenderObject* selObj, LayoutUnit logicalLeft, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*);
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LayoutRect logicalRightSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
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RenderObject* selObj, LayoutUnit logicalRight, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*);
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void getSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap);
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RenderBlock* blockBeforeWithinSelectionRoot(LayoutSize& offset) const;
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virtual void setSelectionState(SelectionState) override;
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LayoutRect logicalRectToPhysicalRect(const LayoutPoint& physicalPosition, const LayoutRect& logicalRect);
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// Helper methods for computing line counts and heights for line counts.
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virtual RootInlineBox* lineAtIndex(int) const;
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virtual int lineCount(const RootInlineBox* = 0, bool* = 0) const;
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void clearTruncation();
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// Accessors for logical width/height and margins in the containing block's block-flow direction.
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LayoutUnit logicalWidthForChild(const RenderBox* child) const { return child->width(); }
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LayoutUnit logicalHeightForChild(const RenderBox* child) const { return child->height(); }
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LayoutSize logicalSizeForChild(const RenderBox* child) const { return child->size(); }
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LayoutUnit logicalTopForChild(const RenderBox* child) const { return child->y(); }
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LayoutUnit marginBeforeForChild(const RenderBoxModelObject* child) const { return child->marginBefore(style()); }
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LayoutUnit marginAfterForChild(const RenderBoxModelObject* child) const { return child->marginAfter(style()); }
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LayoutUnit marginStartForChild(const RenderBoxModelObject* child) const { return child->marginStart(style()); }
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LayoutUnit marginEndForChild(const RenderBoxModelObject* child) const { return child->marginEnd(style()); }
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void setMarginStartForChild(RenderBox* child, LayoutUnit value) const { child->setMarginStart(value, style()); }
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void setMarginEndForChild(RenderBox* child, LayoutUnit value) const { child->setMarginEnd(value, style()); }
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void setMarginBeforeForChild(RenderBox* child, LayoutUnit value) const { child->setMarginBefore(value, style()); }
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void setMarginAfterForChild(RenderBox* child, LayoutUnit value) const { child->setMarginAfter(value, style()); }
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LayoutUnit marginBeforeForChild(const RenderBox* child) const;
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LayoutUnit marginAfterForChild(const RenderBox* child) const;
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virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset) override;
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LayoutUnit availableLogicalWidthForContent() const { return max<LayoutUnit>(0, logicalRightOffsetForContent() - logicalLeftOffsetForContent()); }
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LayoutUnit logicalLeftOffsetForContent() const { return borderLeft() + paddingLeft(); }
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LayoutUnit logicalRightOffsetForContent() const { return logicalLeftOffsetForContent() + availableLogicalWidth(); }
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LayoutUnit startOffsetForContent() const { return style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
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LayoutUnit endOffsetForContent() const { return !style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
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#if ENABLE(ASSERT)
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void checkPositionedObjectsNeedLayout();
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#endif
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#ifndef NDEBUG
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void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0) const;
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#endif
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bool recalcChildOverflowAfterStyleChange();
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bool recalcOverflowAfterStyleChange();
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protected:
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virtual void willBeDestroyed() override;
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void dirtyForLayoutFromPercentageHeightDescendants(SubtreeLayoutScope&);
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enum PositionedLayoutBehavior {
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DefaultLayout,
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ForcedLayoutAfterContainingBlockMoved
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};
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void layoutPositionedObjects(bool relayoutChildren, PositionedLayoutBehavior = DefaultLayout);
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LayoutUnit marginIntrinsicLogicalWidthForChild(RenderBox* child) const;
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int beforeMarginInLineDirection(LineDirectionMode) const;
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virtual void paint(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers) override;
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void paintObject(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers);
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virtual void paintChildren(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers);
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virtual void adjustInlineDirectionLineBounds(unsigned /* expansionOpportunityCount */, float& /* logicalLeft */, float& /* logicalWidth */) const { }
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virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
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virtual void computePreferredLogicalWidths() override;
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virtual int firstLineBoxBaseline(FontBaselineOrAuto baselineType) const override;
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virtual int inlineBlockBaseline(LineDirectionMode) const override;
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virtual int lastLineBoxBaseline(LineDirectionMode) const;
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virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) override;
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virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
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virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
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virtual bool hasLineIfEmpty() const;
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bool simplifiedLayout();
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virtual void simplifiedNormalFlowLayout();
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public:
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virtual void computeOverflow(LayoutUnit oldClientAfterEdge, bool = false);
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protected:
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virtual void addOverflowFromChildren();
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void addOverflowFromPositionedObjects();
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virtual void addFocusRingRects(Vector<IntRect>&, const LayoutPoint& additionalOffset, const RenderBox* paintContainer = 0) const override;
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void updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox*);
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virtual bool isInlineBlock() const override final { return isInline() && isReplaced(); }
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virtual bool hitTestContents(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset);
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private:
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virtual RenderObjectChildList* virtualChildren() override final { return children(); }
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virtual const RenderObjectChildList* virtualChildren() const override final { return children(); }
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virtual const char* renderName() const override;
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virtual bool isRenderBlock() const override final { return true; }
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virtual void dirtyLinesFromChangedChild(RenderObject* child) override final { m_lineBoxes.dirtyLinesFromChangedChild(this, child); }
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void insertIntoTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
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static void removeFromTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
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void paintSelection(PaintInfo&, const LayoutPoint&);
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// Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
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// children.
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virtual RenderBlock* firstLineBlock() const override;
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bool isSelectionRoot() const;
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GapRects selectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
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LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* = 0);
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GapRects blockSelectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
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LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*);
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LayoutRect blockSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
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LayoutUnit lastLogicalTop, LayoutUnit lastLogicalLeft, LayoutUnit lastLogicalRight, LayoutUnit logicalBottom, const PaintInfo*);
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virtual LayoutUnit logicalLeftSelectionOffset(RenderBlock* rootBlock, LayoutUnit position);
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virtual LayoutUnit logicalRightSelectionOffset(RenderBlock* rootBlock, LayoutUnit position);
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virtual void absoluteQuads(Vector<FloatQuad>&) const override;
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virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) override final;
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PositionWithAffinity positionForPointWithInlineChildren(const LayoutPoint&);
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void removeFromGlobalMaps();
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bool widthAvailableToChildrenHasChanged();
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protected:
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bool updateLogicalWidthAndColumnWidth();
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RenderObjectChildList m_children;
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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>.
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LayoutUnit m_pageLogicalOffset;
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unsigned m_hasMarginBeforeQuirk : 1; // Note these quirk values can't be put in RenderBlockRareData since they are set too frequently.
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unsigned m_hasMarginAfterQuirk : 1;
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unsigned m_beingDestroyed : 1;
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unsigned m_hasBorderOrPaddingLogicalWidthChanged : 1;
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// FIXME-BLOCKFLOW: Remove this when the line layout stuff has all moved out of RenderBlock
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friend class LineBreaker;
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// FIXME: This is temporary as we move code that accesses block flow
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// member variables out of RenderBlock and into RenderParagraph.
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friend class RenderParagraph;
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};
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DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());
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} // namespace blink
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#endif // SKY_ENGINE_CORE_RENDERING_RENDERBLOCK_H_
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