/* * 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 RenderBlock_h #define RenderBlock_h #include "DeprecatedPtrList.h" #include "GapRects.h" #include "RenderBox.h" #include "RenderLineBoxList.h" #include "RootInlineBox.h" #include namespace WebCore { class ColumnInfo; class InlineIterator; class RenderInline; struct BidiRun; template class BidiResolver; template struct MidpointState; typedef BidiResolver InlineBidiResolver; typedef MidpointState LineMidpointState; enum CaretType { CursorCaret, DragCaret }; class RenderBlock : public RenderBox { public: RenderBlock(Node*); virtual ~RenderBlock(); const RenderObjectChildList* children() const { return &m_children; } RenderObjectChildList* children() { return &m_children; } virtual void destroy(); // These two functions are overridden for inline-block. virtual int lineHeight(bool firstLine, bool isRootLineBox = false) const; virtual int baselinePosition(bool firstLine, bool isRootLineBox = false) const; RenderLineBoxList* lineBoxes() { return &m_lineBoxes; } const RenderLineBoxList* lineBoxes() const { return &m_lineBoxes; } InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); } InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); } void deleteLineBoxTree(); virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0); virtual void removeChild(RenderObject*); virtual void layoutBlock(bool relayoutChildren); void insertPositionedObject(RenderBox*); void removePositionedObject(RenderBox*); void removePositionedObjects(RenderBlock*); typedef ListHashSet PositionedObjectsListHashSet; PositionedObjectsListHashSet* positionedObjects() const { return m_positionedObjects; } void addPercentHeightDescendant(RenderBox*); static void removePercentHeightDescendant(RenderBox*); HashSet* percentHeightDescendants() const; RootInlineBox* createAndAppendRootInlineBox(); bool generatesLineBoxesForInlineChild(RenderObject*, bool isLineEmpty = true, bool previousLineBrokeCleanly = true); void markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove = 0, bool inLayout = true); void markPositionedObjectsForLayout(); bool containsFloats() { return m_floatingObjects && !m_floatingObjects->isEmpty(); } bool containsFloat(RenderObject*); int lineWidth(int y, bool firstLine) const; virtual int lowestPosition(bool includeOverflowInterior = true, bool includeSelf = true) const; virtual int rightmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const; virtual int leftmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const; int rightOffset(int y, bool firstLine) const { return rightRelOffset(y, rightOffset(), firstLine); } int leftOffset(int y, bool firstLine) const { return leftRelOffset(y, leftOffset(), firstLine); } virtual VisiblePosition positionForPoint(const IntPoint&); // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.) virtual int availableWidth() const; RootInlineBox* firstRootBox() const { return static_cast(firstLineBox()); } RootInlineBox* lastRootBox() const { return static_cast(lastLineBox()); } bool containsNonZeroBidiLevel() const; GapRects selectionGapRectsForRepaint(RenderBoxModelObject* repaintContainer); IntRect fillLeftSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, const PaintInfo*); IntRect fillRightSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, const PaintInfo*); IntRect fillHorizontalSelectionGap(RenderObject* selObj, int xPos, int yPos, int width, int height, const PaintInfo*); void getHorizontalSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap); // Helper methods for computing line counts and heights for line counts. RootInlineBox* lineAtIndex(int); int lineCount(); int heightForLineCount(int); void clearTruncation(); void adjustRectForColumns(IntRect&) const; virtual void adjustForColumns(IntSize&, const IntPoint&) const; void addContinuationWithOutline(RenderInline*); RenderBoxModelObject* continuation() const { return m_continuation; } void setContinuation(RenderBoxModelObject* c) { m_continuation = c; } virtual RenderBoxModelObject* virtualContinuation() const { return continuation(); } bool isAnonymousBlockContinuation() const { return continuation() && isAnonymousBlock(); } RenderInline* inlineElementContinuation() const; RenderBlock* blockElementContinuation() const; // This function is a convenience helper for creating an anonymous block that inherits its // style from this RenderBlock. RenderBlock* createAnonymousBlock(bool isFlexibleBox = false) const; RenderBlock* createAnonymousColumnsBlock() const; RenderBlock* createAnonymousColumnSpanBlock() const; RenderBlock* createAnonymousBlockWithSameTypeAs(RenderBlock* otherAnonymousBlock) const; static void appendRunsForObject(int start, int end, RenderObject*, InlineBidiResolver&); static bool requiresLineBox(const InlineIterator&, bool isLineEmpty = true, bool previousLineBrokeCleanly = true); ColumnInfo* columnInfo() const; int columnGap() const; protected: // These functions are only used internally to manipulate the render tree structure via remove/insert/appendChildNode. // Since they are typically called only to move objects around within anonymous blocks (which only have layers in // the case of column spans), the default for fullRemoveInsert is false rather than true. void moveChildTo(RenderBlock* to, RenderObject* child, bool fullRemoveInsert = false) { return moveChildTo(to, child, 0, fullRemoveInsert); } void moveChildTo(RenderBlock* to, RenderObject* child, RenderObject* beforeChild, bool fullRemoveInsert = false); void moveAllChildrenTo(RenderBlock* to, bool fullRemoveInsert = false) { return moveAllChildrenTo(to, 0, fullRemoveInsert); } void moveAllChildrenTo(RenderBlock* to, RenderObject* beforeChild, bool fullRemoveInsert = false) { return moveChildrenTo(to, firstChild(), 0, beforeChild, fullRemoveInsert); } // Move all of the kids from |startChild| up to but excluding |endChild|. 0 can be passed as the endChild to denote // that all the kids from |startChild| onwards should be added. void moveChildrenTo(RenderBlock* to, RenderObject* startChild, RenderObject* endChild, bool fullRemoveInsert = false) { return moveChildrenTo(to, startChild, endChild, 0, fullRemoveInsert); } void moveChildrenTo(RenderBlock* to, RenderObject* startChild, RenderObject* endChild, RenderObject* beforeChild, bool fullRemoveInsert = false); int maxTopPosMargin() const { return m_maxMargin ? m_maxMargin->m_topPos : MaxMargin::topPosDefault(this); } int maxTopNegMargin() const { return m_maxMargin ? m_maxMargin->m_topNeg : MaxMargin::topNegDefault(this); } int maxBottomPosMargin() const { return m_maxMargin ? m_maxMargin->m_bottomPos : MaxMargin::bottomPosDefault(this); } int maxBottomNegMargin() const { return m_maxMargin ? m_maxMargin->m_bottomNeg : MaxMargin::bottomNegDefault(this); } void setMaxTopMargins(int pos, int neg); void setMaxBottomMargins(int pos, int neg); void initMaxMarginValues() { if (m_maxMargin) { m_maxMargin->m_topPos = MaxMargin::topPosDefault(this); m_maxMargin->m_topNeg = MaxMargin::topNegDefault(this); m_maxMargin->m_bottomPos = MaxMargin::bottomPosDefault(this); m_maxMargin->m_bottomNeg = MaxMargin::bottomNegDefault(this); } } virtual void layout(); void layoutPositionedObjects(bool relayoutChildren); virtual void paint(PaintInfo&, int tx, int ty); virtual void paintObject(PaintInfo&, int tx, int ty); int rightRelOffset(int y, int fixedOffset, bool applyTextIndent = true, int* heightRemaining = 0) const; int leftRelOffset(int y, int fixedOffset, bool applyTextIndent = true, int* heightRemaining = 0) const; virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction); virtual void calcPrefWidths(); virtual int firstLineBoxBaseline() const; virtual int lastLineBoxBaseline() const; virtual void updateFirstLetter(); virtual void updateHitTestResult(HitTestResult&, const IntPoint&); // Delay update scrollbar until finishDelayRepaint() will be // called. This function is used when a flexbox is laying out its // descendant. If multiple calls are made to startDelayRepaint(), // finishDelayRepaint() will do nothing until finishDelayRepaint() // is called the same number of times. static void startDelayUpdateScrollInfo(); static void finishDelayUpdateScrollInfo(); virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle); virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); virtual bool hasLineIfEmpty() const; bool layoutOnlyPositionedObjects(); #if ENABLE(SVG) protected: // Only used by RenderSVGText, which explicitely overrides RenderBlock::layoutBlock(), do NOT use for anything else. void forceLayoutInlineChildren() { int repaintTop = 0; int repaintBottom = 0; layoutInlineChildren(true, repaintTop, repaintBottom); } #endif private: virtual RenderObjectChildList* virtualChildren() { return children(); } virtual const RenderObjectChildList* virtualChildren() const { return children(); } virtual const char* renderName() const; virtual bool isRenderBlock() const { return true; } virtual bool isBlockFlow() const { return (!isInline() || isReplaced()) && !isTable(); } virtual bool isInlineBlockOrInlineTable() const { return isInline() && isReplaced(); } void makeChildrenNonInline(RenderObject* insertionPoint = 0); virtual void removeLeftoverAnonymousBlock(RenderBlock* child); virtual void dirtyLinesFromChangedChild(RenderObject* child) { m_lineBoxes.dirtyLinesFromChangedChild(this, child); } void addChildToContinuation(RenderObject* newChild, RenderObject* beforeChild); void addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild); void addChildToAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild); virtual void addChildIgnoringAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild = 0); virtual bool isSelfCollapsingBlock() const; virtual int maxTopMargin(bool positive) const { return positive ? maxTopPosMargin() : maxTopNegMargin(); } virtual int maxBottomMargin(bool positive) const { return positive ? maxBottomPosMargin() : maxBottomNegMargin(); } virtual void repaintOverhangingFloats(bool paintAllDescendants); void layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom); void layoutInlineChildren(bool relayoutChildren, int& repaintTop, int& repaintBottom); virtual void positionListMarker() { } virtual void borderFitAdjust(int& x, int& w) const; // Shrink the box in which the border paints if border-fit is set. virtual void updateBeforeAfterContent(PseudoId); virtual RootInlineBox* createRootInlineBox(); // Subclassed by SVG and Ruby. // Called to lay out the legend for a fieldset. virtual RenderObject* layoutLegend(bool /*relayoutChildren*/) { return 0; } struct FloatWithRect { FloatWithRect(RenderBox* f) : object(f) , rect(IntRect(f->x() - f->marginLeft(), f->y() - f->marginTop(), f->width() + f->marginLeft() + f->marginRight(), f->height() + f->marginTop() + f->marginBottom())) , everHadLayout(f->m_everHadLayout) { } RenderBox* object; IntRect rect; bool everHadLayout; }; // The following functions' implementations are in RenderBlockLineLayout.cpp. RootInlineBox* determineStartPosition(bool& firstLine, bool& fullLayout, bool& previousLineBrokeCleanly, InlineBidiResolver&, Vector& floats, unsigned& numCleanFloats); RootInlineBox* determineEndPosition(RootInlineBox* startBox, InlineIterator& cleanLineStart, BidiStatus& cleanLineBidiStatus, int& yPos); bool matchedEndLine(const InlineBidiResolver&, const InlineIterator& endLineStart, const BidiStatus& endLineStatus, RootInlineBox*& endLine, int& endYPos, int& repaintBottom, int& repaintTop); void skipTrailingWhitespace(InlineIterator&, bool isLineEmpty, bool previousLineBrokeCleanly); int skipLeadingWhitespace(InlineBidiResolver&, bool firstLine, bool isLineEmpty, bool previousLineBrokeCleanly); void fitBelowFloats(int widthToFit, bool firstLine, int& availableWidth); InlineIterator findNextLineBreak(InlineBidiResolver&, bool firstLine, bool& isLineEmpty, bool& previousLineBrokeCleanly, bool& hyphenated, EClear* = 0); RootInlineBox* constructLine(unsigned runCount, BidiRun* firstRun, BidiRun* lastRun, bool firstLine, bool lastLine, RenderObject* endObject); InlineFlowBox* createLineBoxes(RenderObject*, bool firstLine); void computeHorizontalPositionsForLine(RootInlineBox*, bool firstLine, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd, GlyphOverflowAndFallbackFontsMap&); void computeVerticalPositionsForLine(RootInlineBox*, BidiRun*, GlyphOverflowAndFallbackFontsMap&); void deleteEllipsisLineBoxes(); void checkLinesForTextOverflow(); void addOverflowFromInlineChildren(); // End of functions defined in RenderBlockLineLayout.cpp. void addOverflowFromBlockChildren(); void addOverflowFromFloats(); void paintFloats(PaintInfo&, int tx, int ty, bool preservePhase = false); void paintContents(PaintInfo&, int tx, int ty); void paintColumnContents(PaintInfo&, int tx, int ty, bool paintFloats = false); void paintColumnRules(PaintInfo&, int tx, int ty); void paintChildren(PaintInfo&, int tx, int ty); void paintEllipsisBoxes(PaintInfo&, int tx, int ty); void paintSelection(PaintInfo&, int tx, int ty); void paintCaret(PaintInfo&, int tx, int ty, CaretType); void insertFloatingObject(RenderBox*); void removeFloatingObject(RenderBox*); // Called from lineWidth, to position the floats added in the last line. // Returns ture if and only if it has positioned any floats. bool positionNewFloats(); void clearFloats(); int getClearDelta(RenderBox* child, int yPos); virtual bool avoidsFloats() const; bool hasOverhangingFloats() { return parent() && !hasColumns() && floatBottom() > height(); } void addIntrudingFloats(RenderBlock* prev, int xoffset, int yoffset); int addOverhangingFloats(RenderBlock* child, int xoffset, int yoffset, bool makeChildPaintOtherFloats); int nextFloatBottomBelow(int) const; int floatBottom() const; inline int leftBottom(); inline int rightBottom(); int rightOffset() const; int leftOffset() const; virtual bool hitTestColumns(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction); virtual bool hitTestContents(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction); bool hitTestFloats(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty); virtual bool isPointInOverflowControl(HitTestResult&, int x, int y, int tx, int ty); void calcInlinePrefWidths(); void calcBlockPrefWidths(); // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline // children. virtual RenderBlock* firstLineBlock() const; virtual IntRect rectWithOutlineForRepaint(RenderBoxModelObject* repaintContainer, int outlineWidth); virtual RenderStyle* outlineStyleForRepaint() const; virtual RenderObject* hoverAncestor() const; virtual void updateDragState(bool dragOn); virtual void childBecameNonInline(RenderObject* child); virtual IntRect selectionRectForRepaint(RenderBoxModelObject* repaintContainer, bool /*clipToVisibleContent*/) { return selectionGapRectsForRepaint(repaintContainer); } virtual bool shouldPaintSelectionGaps() const; bool isSelectionRoot() const; GapRects fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* = 0); GapRects fillInlineSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, int& lastTop, int& lastLeft, int& lastRight, const PaintInfo*); GapRects fillBlockSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, int& lastTop, int& lastLeft, int& lastRight, const PaintInfo*); IntRect fillVerticalSelectionGap(int lastTop, int lastLeft, int lastRight, int bottomY, RenderBlock* rootBlock, int blockX, int blockY, const PaintInfo*); int leftSelectionOffset(RenderBlock* rootBlock, int y); int rightSelectionOffset(RenderBlock* rootBlock, int y); virtual void absoluteRects(Vector&, int tx, int ty); virtual void absoluteQuads(Vector&); int desiredColumnWidth() const; unsigned desiredColumnCount() const; void setDesiredColumnCountAndWidth(int count, int width); void paintContinuationOutlines(PaintInfo&, int tx, int ty); virtual IntRect localCaretRect(InlineBox*, int caretOffset, int* extraWidthToEndOfLine = 0); virtual void addFocusRingRects(Vector&, int tx, int ty); void adjustPointToColumnContents(IntPoint&) const; void adjustForBorderFit(int x, int& left, int& right) const; // Helper function for borderFitAdjust void markLinesDirtyInVerticalRange(int top, int bottom, RootInlineBox* highest = 0); void newLine(EClear); Position positionForBox(InlineBox*, bool start = true) const; Position positionForRenderer(RenderObject*, bool start = true) const; VisiblePosition positionForPointWithInlineChildren(const IntPoint&); // Adjust tx and ty from painting offsets to the local coords of this renderer void offsetForContents(int& tx, int& ty) const; void calcColumnWidth(); int layoutColumns(int endOfContent = -1, int requestedColumnHeight = -1); int visibleTopOfHighestFloatExtendingBelow(int bottom, int maxHeight) const; void makeChildrenAnonymousColumnBlocks(RenderObject* beforeChild, RenderBlock* newBlockBox, RenderObject* newChild); bool expandsToEncloseOverhangingFloats() const; void updateScrollInfoAfterLayout(); RenderObject* splitAnonymousBlocksAroundChild(RenderObject* beforeChild); void splitBlocks(RenderBlock* fromBlock, RenderBlock* toBlock, RenderBlock* middleBlock, RenderObject* beforeChild, RenderBoxModelObject* oldCont); void splitFlow(RenderObject* beforeChild, RenderBlock* newBlockBox, RenderObject* newChild, RenderBoxModelObject* oldCont); RenderBlock* clone() const; RenderBlock* continuationBefore(RenderObject* beforeChild); RenderBlock* containingColumnsBlock(bool allowAnonymousColumnBlock = true); RenderBlock* columnsBlockForSpanningElement(RenderObject* newChild); struct FloatingObject : Noncopyable { enum Type { FloatLeft, FloatRight }; FloatingObject(Type type) : m_renderer(0) , m_top(0) , m_bottom(0) , m_left(0) , m_width(0) , m_type(type) , m_shouldPaint(true) , m_isDescendant(false) { } Type type() { return static_cast(m_type); } RenderBox* m_renderer; int m_top; int m_bottom; int m_left; int m_width; unsigned m_type : 1; // Type (left or right aligned) bool m_shouldPaint : 1; bool m_isDescendant : 1; }; class MarginInfo { // Collapsing flags for whether we can collapse our margins with our children's margins. bool m_canCollapseWithChildren : 1; bool m_canCollapseTopWithChildren : 1; bool m_canCollapseBottomWithChildren : 1; // Whether or not we are a quirky container, i.e., do we collapse away top and bottom // margins in our container. Table cells and the body are the common examples. We // also have a custom style property for Safari RSS to deal with TypePad blog articles. bool m_quirkContainer : 1; // This flag tracks whether we are still looking at child margins that can all collapse together at the beginning of a block. // They may or may not collapse with the top margin of the block (|m_canCollapseTopWithChildren| tells us that), but they will // always be collapsing with one another. This variable can remain set to true through multiple iterations // as long as we keep encountering self-collapsing blocks. bool m_atTopOfBlock : 1; // This flag is set when we know we're examining bottom margins and we know we're at the bottom of the block. bool m_atBottomOfBlock : 1; // These variables are used to detect quirky margins that we need to collapse away (in table cells // and in the body element). bool m_topQuirk : 1; bool m_bottomQuirk : 1; bool m_determinedTopQuirk : 1; // These flags track the previous maximal positive and negative margins. int m_posMargin; int m_negMargin; public: MarginInfo(RenderBlock* b, int top, int bottom); void setAtTopOfBlock(bool b) { m_atTopOfBlock = b; } void setAtBottomOfBlock(bool b) { m_atBottomOfBlock = b; } void clearMargin() { m_posMargin = m_negMargin = 0; } void setTopQuirk(bool b) { m_topQuirk = b; } void setBottomQuirk(bool b) { m_bottomQuirk = b; } void setDeterminedTopQuirk(bool b) { m_determinedTopQuirk = b; } void setPosMargin(int p) { m_posMargin = p; } void setNegMargin(int n) { m_negMargin = n; } void setPosMarginIfLarger(int p) { if (p > m_posMargin) m_posMargin = p; } void setNegMarginIfLarger(int n) { if (n > m_negMargin) m_negMargin = n; } void setMargin(int p, int n) { m_posMargin = p; m_negMargin = n; } bool atTopOfBlock() const { return m_atTopOfBlock; } bool canCollapseWithTop() const { return m_atTopOfBlock && m_canCollapseTopWithChildren; } bool canCollapseWithBottom() const { return m_atBottomOfBlock && m_canCollapseBottomWithChildren; } bool canCollapseTopWithChildren() const { return m_canCollapseTopWithChildren; } bool canCollapseBottomWithChildren() const { return m_canCollapseBottomWithChildren; } bool quirkContainer() const { return m_quirkContainer; } bool determinedTopQuirk() const { return m_determinedTopQuirk; } bool topQuirk() const { return m_topQuirk; } bool bottomQuirk() const { return m_bottomQuirk; } int posMargin() const { return m_posMargin; } int negMargin() const { return m_negMargin; } int margin() const { return m_posMargin - m_negMargin; } }; void layoutBlockChild(RenderBox* child, MarginInfo&, int& previousFloatBottom, int& maxFloatBottom); void adjustPositionedBlock(RenderBox* child, const MarginInfo&); void adjustFloatingBlock(const MarginInfo&); bool handleSpecialChild(RenderBox* child, const MarginInfo&); bool handleFloatingChild(RenderBox* child, const MarginInfo&); bool handlePositionedChild(RenderBox* child, const MarginInfo&); bool handleRunInChild(RenderBox* child); int collapseMargins(RenderBox* child, MarginInfo&); int clearFloatsIfNeeded(RenderBox* child, MarginInfo&, int oldTopPosMargin, int oldTopNegMargin, int yPos); int estimateVerticalPosition(RenderBox* child, const MarginInfo&); void determineHorizontalPosition(RenderBox* child); void handleBottomOfBlock(int top, int bottom, MarginInfo&); void setCollapsedBottomMargin(const MarginInfo&); // End helper functions and structs used by layoutBlockChildren. typedef PositionedObjectsListHashSet::const_iterator Iterator; DeprecatedPtrList* m_floatingObjects; PositionedObjectsListHashSet* m_positionedObjects; // An inline can be split with blocks occurring in between the inline content. // When this occurs we need a pointer to our next object. We can basically be // split into a sequence of inlines and blocks. The continuation will either be // an anonymous block (that houses other blocks) or it will be an inline flow. RenderBoxModelObject* m_continuation; // Allocated only when some of these fields have non-default values struct MaxMargin : Noncopyable { MaxMargin(const RenderBlock* o) : m_topPos(topPosDefault(o)) , m_topNeg(topNegDefault(o)) , m_bottomPos(bottomPosDefault(o)) , m_bottomNeg(bottomNegDefault(o)) { } static int topPosDefault(const RenderBlock* o) { return o->marginTop() > 0 ? o->marginTop() : 0; } static int topNegDefault(const RenderBlock* o) { return o->marginTop() < 0 ? -o->marginTop() : 0; } static int bottomPosDefault(const RenderBlock* o) { return o->marginBottom() > 0 ? o->marginBottom() : 0; } static int bottomNegDefault(const RenderBlock* o) { return o->marginBottom() < 0 ? -o->marginBottom() : 0; } int m_topPos; int m_topNeg; int m_bottomPos; int m_bottomNeg; }; MaxMargin* m_maxMargin; RenderObjectChildList m_children; RenderLineBoxList m_lineBoxes; // All of the root line boxes created for this block flow. For example,
Hello
world.
will have two total lines for the
. mutable int m_lineHeight; // RenderRubyBase objects need to be able to split and merge, moving their children around // (calling moveChildTo, moveAllChildrenTo, and makeChildrenNonInline). friend class RenderRubyBase; }; inline RenderBlock* toRenderBlock(RenderObject* object) { ASSERT(!object || object->isRenderBlock()); return static_cast(object); } inline const RenderBlock* toRenderBlock(const RenderObject* object) { ASSERT(!object || object->isRenderBlock()); return static_cast(object); } // This will catch anyone doing an unnecessary cast. void toRenderBlock(const RenderBlock*); } // namespace WebCore #endif // RenderBlock_h