1 /*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 1999 Antti Koivisto (koivisto@kde.org)
4 * (C) 2007 David Smith (catfish.man@gmail.com)
5 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 #ifndef RenderBlock_h
24 #define RenderBlock_h
25
26 #include "DeprecatedPtrList.h"
27 #include "GapRects.h"
28 #include "RenderBox.h"
29 #include "RenderLineBoxList.h"
30 #include "RootInlineBox.h"
31 #include <wtf/ListHashSet.h>
32
33 namespace WebCore {
34
35 class InlineIterator;
36 class RenderInline;
37
38 struct BidiRun;
39
40 template <class Iterator, class Run> class BidiResolver;
41 template <class Iterator> class MidpointState;
42 typedef BidiResolver<InlineIterator, BidiRun> InlineBidiResolver;
43 typedef MidpointState<InlineIterator> LineMidpointState;
44
45 enum CaretType { CursorCaret, DragCaret };
46
47 class RenderBlock : public RenderBox {
48 public:
49 RenderBlock(Node*);
50 virtual ~RenderBlock();
51
children()52 const RenderObjectChildList* children() const { return &m_children; }
children()53 RenderObjectChildList* children() { return &m_children; }
54
55 virtual void destroy();
56
57 // These two functions are overridden for inline-block.
58 virtual int lineHeight(bool firstLine, bool isRootLineBox = false) const;
59 virtual int baselinePosition(bool firstLine, bool isRootLineBox = false) const;
60
lineBoxes()61 RenderLineBoxList* lineBoxes() { return &m_lineBoxes; }
lineBoxes()62 const RenderLineBoxList* lineBoxes() const { return &m_lineBoxes; }
63
firstLineBox()64 InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); }
lastLineBox()65 InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); }
66
67 void deleteLineBoxTree();
68
69 virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0);
70 virtual void removeChild(RenderObject*);
71
72 virtual void layoutBlock(bool relayoutChildren);
73
74 void insertPositionedObject(RenderBox*);
75 void removePositionedObject(RenderBox*);
76 void removePositionedObjects(RenderBlock*);
77
78 void addPercentHeightDescendant(RenderBox*);
79 static void removePercentHeightDescendant(RenderBox*);
80 HashSet<RenderBox*>* percentHeightDescendants() const;
81
82 RootInlineBox* createAndAppendRootInlineBox();
83
84 bool generatesLineBoxesForInlineChild(RenderObject*, bool isLineEmpty = true, bool previousLineBrokeCleanly = true);
85
86 void markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove = 0, bool inLayout = true);
87 void markPositionedObjectsForLayout();
88
containsFloats()89 bool containsFloats() { return m_floatingObjects && !m_floatingObjects->isEmpty(); }
90 bool containsFloat(RenderObject*);
91
92 IntRect floatRect() const;
93
94 int lineWidth(int y, bool firstLine) const;
95
96 virtual int lowestPosition(bool includeOverflowInterior = true, bool includeSelf = true) const;
97 virtual int rightmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const;
98 virtual int leftmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const;
99
rightOffset(int y,bool firstLine)100 int rightOffset(int y, bool firstLine) const { return rightRelOffset(y, rightOffset(), firstLine); }
leftOffset(int y,bool firstLine)101 int leftOffset(int y, bool firstLine) const { return leftRelOffset(y, leftOffset(), firstLine); }
102
103 virtual VisiblePosition positionForPoint(const IntPoint&);
104
105 // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
106 virtual int availableWidth() const;
107
firstRootBox()108 RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); }
lastRootBox()109 RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); }
110
111 bool containsNonZeroBidiLevel() const;
112
113 virtual void setSelectionState(SelectionState s);
114
115 GapRects selectionGapRectsForRepaint(RenderBoxModelObject* repaintContainer);
116 IntRect fillLeftSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,
117 int blockX, int blockY, int tx, int ty, const PaintInfo*);
118 IntRect fillRightSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,
119 int blockX, int blockY, int tx, int ty, const PaintInfo*);
120 IntRect fillHorizontalSelectionGap(RenderObject* selObj, int xPos, int yPos, int width, int height, const PaintInfo*);
121
122 void getHorizontalSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap);
123
124 // Helper methods for computing line counts and heights for line counts.
125 RootInlineBox* lineAtIndex(int);
126 int lineCount();
127 int heightForLineCount(int);
128 void clearTruncation();
129
130 void adjustRectForColumns(IntRect&) const;
131
132 void addContinuationWithOutline(RenderInline*);
133
inlineContinuation()134 RenderInline* inlineContinuation() const { return m_inlineContinuation; }
setInlineContinuation(RenderInline * c)135 void setInlineContinuation(RenderInline* c) { m_inlineContinuation = c; }
136
137 // This function is a convenience helper for creating an anonymous block that inherits its
138 // style from this RenderBlock.
139 RenderBlock* createAnonymousBlock(bool isFlexibleBox = false) const;
140
141 static void appendRunsForObject(int start, int end, RenderObject*, InlineBidiResolver&);
142 static bool requiresLineBox(const InlineIterator&, bool isLineEmpty = true, bool previousLineBrokeCleanly = true);
143
144 protected:
145 void moveChildTo(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* child);
146 void moveChildTo(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* beforeChild, RenderObject* child);
147 void moveAllChildrenTo(RenderObject* to, RenderObjectChildList* toChildList);
148 void moveAllChildrenTo(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* beforeChild);
149
maxTopPosMargin()150 int maxTopPosMargin() const { return m_maxMargin ? m_maxMargin->m_topPos : MaxMargin::topPosDefault(this); }
maxTopNegMargin()151 int maxTopNegMargin() const { return m_maxMargin ? m_maxMargin->m_topNeg : MaxMargin::topNegDefault(this); }
maxBottomPosMargin()152 int maxBottomPosMargin() const { return m_maxMargin ? m_maxMargin->m_bottomPos : MaxMargin::bottomPosDefault(this); }
maxBottomNegMargin()153 int maxBottomNegMargin() const { return m_maxMargin ? m_maxMargin->m_bottomNeg : MaxMargin::bottomNegDefault(this); }
154 void setMaxTopMargins(int pos, int neg);
155 void setMaxBottomMargins(int pos, int neg);
156
initMaxMarginValues()157 void initMaxMarginValues()
158 {
159 if (m_maxMargin) {
160 m_maxMargin->m_topPos = MaxMargin::topPosDefault(this);
161 m_maxMargin->m_topNeg = MaxMargin::topNegDefault(this);
162 m_maxMargin->m_bottomPos = MaxMargin::bottomPosDefault(this);
163 m_maxMargin->m_bottomNeg = MaxMargin::bottomNegDefault(this);
164 }
165 }
166
167 virtual void layout();
168
169 void layoutPositionedObjects(bool relayoutChildren);
170
171 virtual void paint(PaintInfo&, int tx, int ty);
172 virtual void paintObject(PaintInfo&, int tx, int ty);
173
174 int rightRelOffset(int y, int fixedOffset, bool applyTextIndent = true, int* heightRemaining = 0) const;
175 int leftRelOffset(int y, int fixedOffset, bool applyTextIndent = true, int* heightRemaining = 0) const;
176
177 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
178
179 virtual void calcPrefWidths();
180
181 virtual int firstLineBoxBaseline() const;
182 virtual int lastLineBoxBaseline() const;
183
184 virtual void updateFirstLetter();
185
186 virtual void updateHitTestResult(HitTestResult&, const IntPoint&);
187
188 // Delay update scrollbar until finishDelayRepaint() will be
189 // called. This function is used when a flexbox is laying out its
190 // descendant. If multiple calls are made to startDelayRepaint(),
191 // finishDelayRepaint() will do nothing until finishDelayRepaint()
192 // is called the same number of times.
193 static void startDelayUpdateScrollInfo();
194 static void finishDelayUpdateScrollInfo();
195
196 virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle);
197 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
198
199 virtual bool hasLineIfEmpty() const;
200 bool layoutOnlyPositionedObjects();
201
202 private:
virtualChildren()203 virtual RenderObjectChildList* virtualChildren() { return children(); }
virtualChildren()204 virtual const RenderObjectChildList* virtualChildren() const { return children(); }
205
206 virtual const char* renderName() const;
207
isRenderBlock()208 virtual bool isRenderBlock() const { return true; }
isBlockFlow()209 virtual bool isBlockFlow() const { return (!isInline() || isReplaced()) && !isTable(); }
isInlineBlockOrInlineTable()210 virtual bool isInlineBlockOrInlineTable() const { return isInline() && isReplaced(); }
211
212 void makeChildrenNonInline(RenderObject* insertionPoint = 0);
213 virtual void removeLeftoverAnonymousBlock(RenderBlock* child);
214
dirtyLinesFromChangedChild(RenderObject * child)215 virtual void dirtyLinesFromChangedChild(RenderObject* child) { m_lineBoxes.dirtyLinesFromChangedChild(this, child); }
216
217 virtual bool isSelfCollapsingBlock() const;
218
maxTopMargin(bool positive)219 virtual int maxTopMargin(bool positive) const { return positive ? maxTopPosMargin() : maxTopNegMargin(); }
maxBottomMargin(bool positive)220 virtual int maxBottomMargin(bool positive) const { return positive ? maxBottomPosMargin() : maxBottomNegMargin(); }
221
222 virtual void repaintOverhangingFloats(bool paintAllDescendants);
223
224 void layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom);
225 void layoutInlineChildren(bool relayoutChildren, int& repaintTop, int& repaintBottom);
226
positionListMarker()227 virtual void positionListMarker() { }
228
229 virtual void borderFitAdjust(int& x, int& w) const; // Shrink the box in which the border paints if border-fit is set.
230
231 virtual void updateBeforeAfterContent(PseudoId);
232
233 virtual RootInlineBox* createRootInlineBox(); // Subclassed by SVG and Ruby.
234
235 // Called to lay out the legend for a fieldset.
layoutLegend(bool)236 virtual RenderObject* layoutLegend(bool /*relayoutChildren*/) { return 0; }
237
238 struct FloatWithRect {
FloatWithRectFloatWithRect239 FloatWithRect(RenderBox* f)
240 : object(f)
241 , rect(IntRect(f->x() - f->marginLeft(), f->y() - f->marginTop(), f->width() + f->marginLeft() + f->marginRight(), f->height() + f->marginTop() + f->marginBottom()))
242 , everHadLayout(f->m_everHadLayout)
243 {
244 }
245
246 RenderBox* object;
247 IntRect rect;
248 bool everHadLayout;
249 };
250
251 // The following functions' implementations are in RenderBlockLineLayout.cpp.
252 void bidiReorderLine(InlineBidiResolver&, const InlineIterator& end, bool previousLineBrokeCleanly);
253 RootInlineBox* determineStartPosition(bool& firstLine, bool& fullLayout, bool& previousLineBrokeCleanly,
254 InlineBidiResolver&, Vector<FloatWithRect>& floats, unsigned& numCleanFloats);
255 RootInlineBox* determineEndPosition(RootInlineBox* startBox, InlineIterator& cleanLineStart,
256 BidiStatus& cleanLineBidiStatus,
257 int& yPos);
258 bool matchedEndLine(const InlineBidiResolver&, const InlineIterator& endLineStart, const BidiStatus& endLineStatus,
259 RootInlineBox*& endLine, int& endYPos, int& repaintBottom, int& repaintTop);
260
261 void skipTrailingWhitespace(InlineIterator&, bool isLineEmpty, bool previousLineBrokeCleanly);
262 int skipLeadingWhitespace(InlineBidiResolver&, bool firstLine, bool isLineEmpty, bool previousLineBrokeCleanly);
263 void fitBelowFloats(int widthToFit, bool firstLine, int& availableWidth);
264 InlineIterator findNextLineBreak(InlineBidiResolver&, bool firstLine, bool& isLineEmpty, bool& previousLineBrokeCleanly, EClear* clear = 0);
265 RootInlineBox* constructLine(unsigned runCount, BidiRun* firstRun, BidiRun* lastRun, bool firstLine, bool lastLine, RenderObject* endObject);
266 InlineFlowBox* createLineBoxes(RenderObject*, bool firstLine);
267 void computeHorizontalPositionsForLine(RootInlineBox*, bool firstLine, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd);
268 void computeVerticalPositionsForLine(RootInlineBox*, BidiRun*);
269 void deleteEllipsisLineBoxes();
270 void checkLinesForTextOverflow();
271 void addOverflowFromInlineChildren();
272 // End of functions defined in RenderBlockLineLayout.cpp.
273
274 void addOverflowFromBlockChildren();
275 void addOverflowFromFloats();
276
277 void paintFloats(PaintInfo&, int tx, int ty, bool preservePhase = false);
278 void paintContents(PaintInfo&, int tx, int ty);
279 void paintColumnContents(PaintInfo&, int tx, int ty, bool paintFloats = false);
280 void paintColumnRules(PaintInfo&, int tx, int ty);
281 void paintChildren(PaintInfo&, int tx, int ty);
282 void paintEllipsisBoxes(PaintInfo&, int tx, int ty);
283 void paintSelection(PaintInfo&, int tx, int ty);
284 void paintCaret(PaintInfo&, int tx, int ty, CaretType);
285
286 void insertFloatingObject(RenderBox*);
287 void removeFloatingObject(RenderBox*);
288
289 // Called from lineWidth, to position the floats added in the last line.
290 // Returns ture if and only if it has positioned any floats.
291 bool positionNewFloats();
292 void clearFloats();
293 int getClearDelta(RenderBox* child, int yPos);
294
295 virtual bool avoidsFloats() const;
296
hasOverhangingFloats()297 bool hasOverhangingFloats() { return parent() && !hasColumns() && floatBottom() > height(); }
298 void addIntrudingFloats(RenderBlock* prev, int xoffset, int yoffset);
299 int addOverhangingFloats(RenderBlock* child, int xoffset, int yoffset, bool makeChildPaintOtherFloats);
300
301 int nextFloatBottomBelow(int) const;
302 int floatBottom() const;
303 inline int leftBottom();
304 inline int rightBottom();
305
306 int rightOffset() const;
307 int leftOffset() const;
308 virtual bool hitTestColumns(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
309 virtual bool hitTestContents(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
310
311 virtual bool isPointInOverflowControl(HitTestResult&, int x, int y, int tx, int ty);
312
313 void calcInlinePrefWidths();
314 void calcBlockPrefWidths();
315
316 // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
317 // children.
318 virtual RenderBlock* firstLineBlock() const;
319 bool inRootBlockContext() const;
320
321 virtual IntRect rectWithOutlineForRepaint(RenderBoxModelObject* repaintContainer, int outlineWidth);
322 virtual RenderStyle* outlineStyleForRepaint() const;
323
324 virtual RenderObject* hoverAncestor() const;
325 virtual void updateDragState(bool dragOn);
326 virtual void childBecameNonInline(RenderObject* child);
327
selectionRectForRepaint(RenderBoxModelObject * repaintContainer,bool)328 virtual IntRect selectionRectForRepaint(RenderBoxModelObject* repaintContainer, bool /*clipToVisibleContent*/)
329 {
330 return selectionGapRectsForRepaint(repaintContainer);
331 }
332 virtual bool shouldPaintSelectionGaps() const;
333 bool isSelectionRoot() const;
334 GapRects fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,
335 int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* = 0);
336 GapRects fillInlineSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,
337 int& lastTop, int& lastLeft, int& lastRight, const PaintInfo*);
338 GapRects fillBlockSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,
339 int& lastTop, int& lastLeft, int& lastRight, const PaintInfo*);
340 IntRect fillVerticalSelectionGap(int lastTop, int lastLeft, int lastRight, int bottomY, RenderBlock* rootBlock,
341 int blockX, int blockY, const PaintInfo*);
342 int leftSelectionOffset(RenderBlock* rootBlock, int y);
343 int rightSelectionOffset(RenderBlock* rootBlock, int y);
344
345 virtual void absoluteRects(Vector<IntRect>&, int tx, int ty);
346 virtual void absoluteQuads(Vector<FloatQuad>&);
347
348 int desiredColumnWidth() const;
349 unsigned desiredColumnCount() const;
350 #if PLATFORM(ANDROID)
351 public:
352 #endif
353 Vector<IntRect>* columnRects() const;
354 #if PLATFORM(ANDROID)
355 private:
356 #endif
357 void setDesiredColumnCountAndWidth(int count, int width);
358 #if PLATFORM(ANDROID)
359 public:
360 #endif
361 int columnGap() const;
362 #if PLATFORM(ANDROID)
363 private:
364 #endif
365
366 void paintContinuationOutlines(PaintInfo&, int tx, int ty);
367
368 virtual IntRect localCaretRect(InlineBox*, int caretOffset, int* extraWidthToEndOfLine = 0);
369
370 virtual void addFocusRingRects(Vector<IntRect>&, int tx, int ty);
371
372 void adjustPointToColumnContents(IntPoint&) const;
373 void adjustForBorderFit(int x, int& left, int& right) const; // Helper function for borderFitAdjust
374
375 void markLinesDirtyInVerticalRange(int top, int bottom, RootInlineBox* highest = 0);
376
377 void newLine(EClear);
378
379 Position positionForBox(InlineBox*, bool start = true) const;
380 Position positionForRenderer(RenderObject*, bool start = true) const;
381 VisiblePosition positionForPointWithInlineChildren(const IntPoint&);
382
383 // Adjust tx and ty from painting offsets to the local coords of this renderer
384 void offsetForContents(int& tx, int& ty) const;
385
386 void calcColumnWidth();
387 int layoutColumns(int endOfContent = -1, int requestedColumnHeight = -1);
388
389 bool expandsToEncloseOverhangingFloats() const;
390
391 void updateScrollInfoAfterLayout();
392
393 struct FloatingObject : Noncopyable {
394 enum Type {
395 FloatLeft,
396 FloatRight
397 };
398
FloatingObjectFloatingObject399 FloatingObject(Type type)
400 : m_renderer(0)
401 , m_top(0)
402 , m_bottom(0)
403 , m_left(0)
404 , m_width(0)
405 , m_type(type)
406 , m_shouldPaint(true)
407 , m_isDescendant(false)
408 {
409 }
410
typeFloatingObject411 Type type() { return static_cast<Type>(m_type); }
412
413 RenderBox* m_renderer;
414 int m_top;
415 int m_bottom;
416 int m_left;
417 int m_width;
418 unsigned m_type : 1; // Type (left or right aligned)
419 bool m_shouldPaint : 1;
420 bool m_isDescendant : 1;
421 };
422
423 class MarginInfo {
424 // Collapsing flags for whether we can collapse our margins with our children's margins.
425 bool m_canCollapseWithChildren : 1;
426 bool m_canCollapseTopWithChildren : 1;
427 bool m_canCollapseBottomWithChildren : 1;
428
429 // Whether or not we are a quirky container, i.e., do we collapse away top and bottom
430 // margins in our container. Table cells and the body are the common examples. We
431 // also have a custom style property for Safari RSS to deal with TypePad blog articles.
432 bool m_quirkContainer : 1;
433
434 // This flag tracks whether we are still looking at child margins that can all collapse together at the beginning of a block.
435 // They may or may not collapse with the top margin of the block (|m_canCollapseTopWithChildren| tells us that), but they will
436 // always be collapsing with one another. This variable can remain set to true through multiple iterations
437 // as long as we keep encountering self-collapsing blocks.
438 bool m_atTopOfBlock : 1;
439
440 // This flag is set when we know we're examining bottom margins and we know we're at the bottom of the block.
441 bool m_atBottomOfBlock : 1;
442
443 // These variables are used to detect quirky margins that we need to collapse away (in table cells
444 // and in the body element).
445 bool m_topQuirk : 1;
446 bool m_bottomQuirk : 1;
447 bool m_determinedTopQuirk : 1;
448
449 // These flags track the previous maximal positive and negative margins.
450 int m_posMargin;
451 int m_negMargin;
452
453 public:
454 MarginInfo(RenderBlock* b, int top, int bottom);
455
setAtTopOfBlock(bool b)456 void setAtTopOfBlock(bool b) { m_atTopOfBlock = b; }
setAtBottomOfBlock(bool b)457 void setAtBottomOfBlock(bool b) { m_atBottomOfBlock = b; }
clearMargin()458 void clearMargin() { m_posMargin = m_negMargin = 0; }
setTopQuirk(bool b)459 void setTopQuirk(bool b) { m_topQuirk = b; }
setBottomQuirk(bool b)460 void setBottomQuirk(bool b) { m_bottomQuirk = b; }
setDeterminedTopQuirk(bool b)461 void setDeterminedTopQuirk(bool b) { m_determinedTopQuirk = b; }
setPosMargin(int p)462 void setPosMargin(int p) { m_posMargin = p; }
setNegMargin(int n)463 void setNegMargin(int n) { m_negMargin = n; }
setPosMarginIfLarger(int p)464 void setPosMarginIfLarger(int p) { if (p > m_posMargin) m_posMargin = p; }
setNegMarginIfLarger(int n)465 void setNegMarginIfLarger(int n) { if (n > m_negMargin) m_negMargin = n; }
466
setMargin(int p,int n)467 void setMargin(int p, int n) { m_posMargin = p; m_negMargin = n; }
468
atTopOfBlock()469 bool atTopOfBlock() const { return m_atTopOfBlock; }
canCollapseWithTop()470 bool canCollapseWithTop() const { return m_atTopOfBlock && m_canCollapseTopWithChildren; }
canCollapseWithBottom()471 bool canCollapseWithBottom() const { return m_atBottomOfBlock && m_canCollapseBottomWithChildren; }
canCollapseTopWithChildren()472 bool canCollapseTopWithChildren() const { return m_canCollapseTopWithChildren; }
canCollapseBottomWithChildren()473 bool canCollapseBottomWithChildren() const { return m_canCollapseBottomWithChildren; }
quirkContainer()474 bool quirkContainer() const { return m_quirkContainer; }
determinedTopQuirk()475 bool determinedTopQuirk() const { return m_determinedTopQuirk; }
topQuirk()476 bool topQuirk() const { return m_topQuirk; }
bottomQuirk()477 bool bottomQuirk() const { return m_bottomQuirk; }
posMargin()478 int posMargin() const { return m_posMargin; }
negMargin()479 int negMargin() const { return m_negMargin; }
margin()480 int margin() const { return m_posMargin - m_negMargin; }
481 };
482
483 void layoutBlockChild(RenderBox* child, MarginInfo&, int& previousFloatBottom, int& maxFloatBottom);
484 void adjustPositionedBlock(RenderBox* child, const MarginInfo&);
485 void adjustFloatingBlock(const MarginInfo&);
486 bool handleSpecialChild(RenderBox* child, const MarginInfo&);
487 bool handleFloatingChild(RenderBox* child, const MarginInfo&);
488 bool handlePositionedChild(RenderBox* child, const MarginInfo&);
489 bool handleRunInChild(RenderBox* child);
490 int collapseMargins(RenderBox* child, MarginInfo&);
491 int clearFloatsIfNeeded(RenderBox* child, MarginInfo&, int oldTopPosMargin, int oldTopNegMargin, int yPos);
492 int estimateVerticalPosition(RenderBox* child, const MarginInfo&);
493 void determineHorizontalPosition(RenderBox* child);
494 void handleBottomOfBlock(int top, int bottom, MarginInfo&);
495 void setCollapsedBottomMargin(const MarginInfo&);
496 // End helper functions and structs used by layoutBlockChildren.
497
498 typedef ListHashSet<RenderBox*>::const_iterator Iterator;
499 DeprecatedPtrList<FloatingObject>* m_floatingObjects;
500 ListHashSet<RenderBox*>* m_positionedObjects;
501
502 // An inline can be split with blocks occurring in between the inline content.
503 // When this occurs we need a pointer to our next object. We can basically be
504 // split into a sequence of inlines and blocks. The continuation will either be
505 // an anonymous block (that houses other blocks) or it will be an inline flow.
506 RenderInline* m_inlineContinuation;
507
508 // Allocated only when some of these fields have non-default values
509 struct MaxMargin : Noncopyable {
MaxMarginMaxMargin510 MaxMargin(const RenderBlock* o)
511 : m_topPos(topPosDefault(o))
512 , m_topNeg(topNegDefault(o))
513 , m_bottomPos(bottomPosDefault(o))
514 , m_bottomNeg(bottomNegDefault(o))
515 {
516 }
517
topPosDefaultMaxMargin518 static int topPosDefault(const RenderBlock* o) { return o->marginTop() > 0 ? o->marginTop() : 0; }
topNegDefaultMaxMargin519 static int topNegDefault(const RenderBlock* o) { return o->marginTop() < 0 ? -o->marginTop() : 0; }
bottomPosDefaultMaxMargin520 static int bottomPosDefault(const RenderBlock* o) { return o->marginBottom() > 0 ? o->marginBottom() : 0; }
bottomNegDefaultMaxMargin521 static int bottomNegDefault(const RenderBlock* o) { return o->marginBottom() < 0 ? -o->marginBottom() : 0; }
522
523 int m_topPos;
524 int m_topNeg;
525 int m_bottomPos;
526 int m_bottomNeg;
527 };
528
529 MaxMargin* m_maxMargin;
530
531 RenderObjectChildList m_children;
532 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>.
533
534 mutable int m_lineHeight;
535
536 // RenderRubyBase objects need to be able to split and merge, moving their children around
537 // (calling moveChildTo, moveAllChildrenTo, and makeChildrenNonInline).
538 friend class RenderRubyBase;
539 };
540
toRenderBlock(RenderObject * object)541 inline RenderBlock* toRenderBlock(RenderObject* object)
542 {
543 ASSERT(!object || object->isRenderBlock());
544 return static_cast<RenderBlock*>(object);
545 }
546
toRenderBlock(const RenderObject * object)547 inline const RenderBlock* toRenderBlock(const RenderObject* object)
548 {
549 ASSERT(!object || object->isRenderBlock());
550 return static_cast<const RenderBlock*>(object);
551 }
552
553 // This will catch anyone doing an unnecessary cast.
554 void toRenderBlock(const RenderBlock*);
555
556 } // namespace WebCore
557
558 #endif // RenderBlock_h
559