/* | |
* 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 <wtf/ListHashSet.h> | |
namespace WebCore { | |
class InlineIterator; | |
class RenderInline; | |
struct BidiRun; | |
template <class Iterator, class Run> class BidiResolver; | |
template <class Iterator> class MidpointState; | |
typedef BidiResolver<InlineIterator, BidiRun> InlineBidiResolver; | |
typedef MidpointState<InlineIterator> 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<RenderBox*, 4> PositionedObjectsListHashSet; | |
PositionedObjectsListHashSet* positionedObjects() const { return m_positionedObjects; } | |
void addPercentHeightDescendant(RenderBox*); | |
static void removePercentHeightDescendant(RenderBox*); | |
HashSet<RenderBox*>* 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<RootInlineBox*>(firstLineBox()); } | |
RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); } | |
bool containsNonZeroBidiLevel() const; | |
virtual void setSelectionState(SelectionState s); | |
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*); | |
RenderInline* inlineContinuation() const { return m_inlineContinuation; } | |
void setInlineContinuation(RenderInline* c) { m_inlineContinuation = c; } | |
// This function is a convenience helper for creating an anonymous block that inherits its | |
// style from this RenderBlock. | |
RenderBlock* createAnonymousBlock(bool isFlexibleBox = false) const; | |
static void appendRunsForObject(int start, int end, RenderObject*, InlineBidiResolver&); | |
static bool requiresLineBox(const InlineIterator&, bool isLineEmpty = true, bool previousLineBrokeCleanly = true); | |
protected: | |
void moveChildTo(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* child); | |
void moveChildTo(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* beforeChild, RenderObject* child); | |
void moveAllChildrenTo(RenderObject* to, RenderObjectChildList* toChildList); | |
void moveAllChildrenTo(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* beforeChild); | |
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(); | |
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); } | |
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. | |
void bidiReorderLine(InlineBidiResolver&, const InlineIterator& end, bool previousLineBrokeCleanly); | |
RootInlineBox* determineStartPosition(bool& firstLine, bool& fullLayout, bool& previousLineBrokeCleanly, | |
InlineBidiResolver&, Vector<FloatWithRect>& 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, EClear* clear = 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); | |
void computeVerticalPositionsForLine(RootInlineBox*, BidiRun*); | |
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); | |
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<IntRect>&, int tx, int ty); | |
virtual void absoluteQuads(Vector<FloatQuad>&); | |
int desiredColumnWidth() const; | |
unsigned desiredColumnCount() const; | |
Vector<IntRect>* columnRects() const; | |
void setDesiredColumnCountAndWidth(int count, int width); | |
int columnGap() const; | |
void paintContinuationOutlines(PaintInfo&, int tx, int ty); | |
virtual IntRect localCaretRect(InlineBox*, int caretOffset, int* extraWidthToEndOfLine = 0); | |
virtual void addFocusRingRects(Vector<IntRect>&, 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; | |
bool expandsToEncloseOverhangingFloats() const; | |
void updateScrollInfoAfterLayout(); | |
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<Type>(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<FloatingObject>* 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. | |
RenderInline* m_inlineContinuation; | |
// 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, <div>Hello<br>world.</div> will have two total lines for the <div>. | |
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<RenderBlock*>(object); | |
} | |
inline const RenderBlock* toRenderBlock(const RenderObject* object) | |
{ | |
ASSERT(!object || object->isRenderBlock()); | |
return static_cast<const RenderBlock*>(object); | |
} | |
// This will catch anyone doing an unnecessary cast. | |
void toRenderBlock(const RenderBlock*); | |
} // namespace WebCore | |
#endif // RenderBlock_h |