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 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 class RootInlineBox;
38
39 struct BidiRun;
40
41 template <class Iterator, class Run> class BidiResolver;
42 template <class Iterator> class MidpointState;
43 typedef BidiResolver<InlineIterator, BidiRun> InlineBidiResolver;
44 typedef MidpointState<InlineIterator> LineMidpointState;
45
46 enum CaretType { CursorCaret, DragCaret };
47
48 class RenderBlock : public RenderBox {
49 public:
50 RenderBlock(Node*);
51 virtual ~RenderBlock();
52
children()53 const RenderObjectChildList* children() const { return &m_children; }
children()54 RenderObjectChildList* children() { return &m_children; }
55
56 virtual void destroy();
57
58 // These two functions are overridden for inline-block.
59 virtual int lineHeight(bool firstLine, bool isRootLineBox = false) const;
60 virtual int baselinePosition(bool firstLine, bool isRootLineBox = false) const;
61
lineBoxes()62 RenderLineBoxList* lineBoxes() { return &m_lineBoxes; }
lineBoxes()63 const RenderLineBoxList* lineBoxes() const { return &m_lineBoxes; }
64
firstLineBox()65 InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); }
lastLineBox()66 InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); }
67
68 void deleteLineBoxTree();
69
70 // The height (and width) of a block when you include overflow spillage out of the bottom
71 // of the block (e.g., a <div style="height:25px"> that has a 100px tall image inside
72 // it would have an overflow height of borderTop() + paddingTop() + 100px.
73 virtual int overflowHeight(bool includeInterior = true) const;
74 virtual int overflowWidth(bool includeInterior = true) const;
75 virtual int overflowLeft(bool includeInterior = true) const;
76 virtual int overflowTop(bool includeInterior = true) const;
77 virtual IntRect overflowRect(bool includeInterior = true) const;
78
79 void addVisualOverflow(const IntRect&);
80
81 virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0);
82 virtual void removeChild(RenderObject*);
83
84 virtual void layoutBlock(bool relayoutChildren);
85
86 void insertPositionedObject(RenderBox*);
87 void removePositionedObject(RenderBox*);
88 void removePositionedObjects(RenderBlock*);
89
90 void addPercentHeightDescendant(RenderBox*);
91 static void removePercentHeightDescendant(RenderBox*);
92 HashSet<RenderBox*>* percentHeightDescendants() const;
93
94 RootInlineBox* createAndAppendRootInlineBox();
95
96 bool generatesLineBoxesForInlineChild(RenderObject*, bool isLineEmpty = true, bool previousLineBrokeCleanly = true);
97
98 void markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove = 0, bool inLayout = true);
99 void markPositionedObjectsForLayout();
100
containsFloats()101 bool containsFloats() { return m_floatingObjects && !m_floatingObjects->isEmpty(); }
102 bool containsFloat(RenderObject*);
103
104 IntRect floatRect() const;
105
106 int lineWidth(int y, bool firstLine) const;
107 virtual int lowestPosition(bool includeOverflowInterior = true, bool includeSelf = true) const;
108 virtual int rightmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const;
109 virtual int leftmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const;
110
rightOffset(int y,bool firstLine)111 int rightOffset(int y, bool firstLine) const { return rightRelOffset(y, rightOffset(), firstLine); }
leftOffset(int y,bool firstLine)112 int leftOffset(int y, bool firstLine) const { return leftRelOffset(y, leftOffset(), firstLine); }
113
114 virtual VisiblePosition positionForPoint(const IntPoint&);
115
116 // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
117 virtual int availableWidth() const;
118
firstRootBox()119 RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); }
lastRootBox()120 RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); }
121
122 bool containsNonZeroBidiLevel() const;
123
124 virtual void setSelectionState(SelectionState s);
125
126 GapRects selectionGapRectsForRepaint(RenderBoxModelObject* repaintContainer);
127 IntRect fillLeftSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,
128 int blockX, int blockY, int tx, int ty, const PaintInfo*);
129 IntRect fillRightSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,
130 int blockX, int blockY, int tx, int ty, const PaintInfo*);
131 IntRect fillHorizontalSelectionGap(RenderObject* selObj, int xPos, int yPos, int width, int height, const PaintInfo*);
132
133 void getHorizontalSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap);
134
135 // Helper methods for computing line counts and heights for line counts.
136 RootInlineBox* lineAtIndex(int);
137 int lineCount();
138 int heightForLineCount(int);
139 void clearTruncation();
140
141 void adjustRectForColumns(IntRect&) const;
142
143 void addContinuationWithOutline(RenderInline*);
144
inlineContinuation()145 RenderInline* inlineContinuation() const { return m_inlineContinuation; }
setInlineContinuation(RenderInline * c)146 void setInlineContinuation(RenderInline* c) { m_inlineContinuation = c; }
147
148 // This function is a convenience helper for creating an anonymous block that inherits its
149 // style from this RenderBlock.
150 RenderBlock* createAnonymousBlock() const;
151
152 Vector<IntRect>* columnRects() const;
153 int columnGap() const;
154
155 protected:
setOverflowHeight(int h)156 virtual void setOverflowHeight(int h) { m_overflowHeight = h; }
setOverflowWidth(int w)157 virtual void setOverflowWidth(int w) { m_overflowWidth = w; }
158
maxTopPosMargin()159 int maxTopPosMargin() const { return m_maxMargin ? m_maxMargin->m_topPos : MaxMargin::topPosDefault(this); }
maxTopNegMargin()160 int maxTopNegMargin() const { return m_maxMargin ? m_maxMargin->m_topNeg : MaxMargin::topNegDefault(this); }
maxBottomPosMargin()161 int maxBottomPosMargin() const { return m_maxMargin ? m_maxMargin->m_bottomPos : MaxMargin::bottomPosDefault(this); }
maxBottomNegMargin()162 int maxBottomNegMargin() const { return m_maxMargin ? m_maxMargin->m_bottomNeg : MaxMargin::bottomNegDefault(this); }
163 void setMaxTopMargins(int pos, int neg);
164 void setMaxBottomMargins(int pos, int neg);
165
initMaxMarginValues()166 void initMaxMarginValues()
167 {
168 if (m_maxMargin) {
169 m_maxMargin->m_topPos = MaxMargin::topPosDefault(this);
170 m_maxMargin->m_topNeg = MaxMargin::topNegDefault(this);
171 m_maxMargin->m_bottomPos = MaxMargin::bottomPosDefault(this);
172 m_maxMargin->m_bottomNeg = MaxMargin::bottomNegDefault(this);
173 }
174 }
175
176 virtual void layout();
177
178 void layoutPositionedObjects(bool relayoutChildren);
179
180 virtual void paint(PaintInfo&, int tx, int ty);
181 virtual void paintObject(PaintInfo&, int tx, int ty);
182
183 int rightRelOffset(int y, int fixedOffset, bool applyTextIndent = true, int* heightRemaining = 0) const;
184 int leftRelOffset(int y, int fixedOffset, bool applyTextIndent = true, int* heightRemaining = 0) const;
185
186 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
187
188 virtual void calcPrefWidths();
189
190 virtual int firstLineBoxBaseline() const;
191 virtual int lastLineBoxBaseline() const;
192
193 virtual void updateFirstLetter();
194
195 virtual void updateHitTestResult(HitTestResult&, const IntPoint&);
196
197 // Delay update scrollbar until finishDelayRepaint() will be
198 // called. This function is used when a flexbox is laying out its
199 // descendant. If multiple calls are made to startDelayRepaint(),
200 // finishDelayRepaint() will do nothing until finishDelayRepaint()
201 // is called the same number of times.
202 static void startDelayUpdateScrollInfo();
203 static void finishDelayUpdateScrollInfo();
204
205 virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle);
206 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
207
208 virtual bool hasLineIfEmpty() const;
209 bool layoutOnlyPositionedObjects();
210
211 private:
virtualChildren()212 virtual RenderObjectChildList* virtualChildren() { return children(); }
virtualChildren()213 virtual const RenderObjectChildList* virtualChildren() const { return children(); }
214
215 virtual const char* renderName() const;
216
isRenderBlock()217 virtual bool isRenderBlock() const { return true; }
isBlockFlow()218 virtual bool isBlockFlow() const { return (!isInline() || isReplaced()) && !isTable(); }
isInlineBlockOrInlineTable()219 virtual bool isInlineBlockOrInlineTable() const { return isInline() && isReplaced(); }
220
221 void makeChildrenNonInline(RenderObject* insertionPoint = 0);
222 virtual void removeLeftoverAnonymousBlock(RenderBlock* child);
223
dirtyLinesFromChangedChild(RenderObject * child)224 virtual void dirtyLinesFromChangedChild(RenderObject* child) { m_lineBoxes.dirtyLinesFromChangedChild(this, child); }
225
226 virtual bool isSelfCollapsingBlock() const;
227
maxTopMargin(bool positive)228 virtual int maxTopMargin(bool positive) const { return positive ? maxTopPosMargin() : maxTopNegMargin(); }
maxBottomMargin(bool positive)229 virtual int maxBottomMargin(bool positive) const { return positive ? maxBottomPosMargin() : maxBottomNegMargin(); }
230
231 virtual void repaintOverhangingFloats(bool paintAllDescendants);
232
233 void layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom);
234 void layoutInlineChildren(bool relayoutChildren, int& repaintTop, int& repaintBottom);
235
positionListMarker()236 virtual void positionListMarker() { }
237
238 virtual void borderFitAdjust(int& x, int& w) const; // Shrink the box in which the border paints if border-fit is set.
239
240 virtual void updateBeforeAfterContent(PseudoId);
241
242 virtual RootInlineBox* createRootInlineBox(); // Subclassed by SVG and Ruby.
243
244 // Called to lay out the legend for a fieldset.
layoutLegend(bool)245 virtual RenderObject* layoutLegend(bool /*relayoutChildren*/) { return 0; }
246
247 struct FloatWithRect {
FloatWithRectFloatWithRect248 FloatWithRect(RenderBox* f)
249 : object(f)
250 , rect(IntRect(f->x() - f->marginLeft(), f->y() - f->marginTop(), f->width() + f->marginLeft() + f->marginRight(), f->height() + f->marginTop() + f->marginBottom()))
251 , everHadLayout(f->m_everHadLayout)
252 {
253 }
254
255 RenderBox* object;
256 IntRect rect;
257 bool everHadLayout;
258 };
259
260 // The following functions' implementations are in RenderBlockLineLayout.cpp.
261 void bidiReorderLine(InlineBidiResolver&, const InlineIterator& end, bool previousLineBrokeCleanly);
262 RootInlineBox* determineStartPosition(bool& firstLine, bool& fullLayout, bool& previousLineBrokeCleanly,
263 InlineBidiResolver&, Vector<FloatWithRect>& floats, unsigned& numCleanFloats);
264 RootInlineBox* determineEndPosition(RootInlineBox* startBox, InlineIterator& cleanLineStart,
265 BidiStatus& cleanLineBidiStatus,
266 int& yPos);
267 bool matchedEndLine(const InlineBidiResolver&, const InlineIterator& endLineStart, const BidiStatus& endLineStatus,
268 RootInlineBox*& endLine, int& endYPos, int& repaintBottom, int& repaintTop);
269
270 void skipTrailingWhitespace(InlineIterator&, bool isLineEmpty, bool previousLineBrokeCleanly);
271 int skipLeadingWhitespace(InlineBidiResolver&, bool firstLine, bool isLineEmpty, bool previousLineBrokeCleanly);
272 void fitBelowFloats(int widthToFit, bool firstLine, int& availableWidth);
273 InlineIterator findNextLineBreak(InlineBidiResolver&, bool firstLine, bool& isLineEmpty, bool& previousLineBrokeCleanly, EClear* clear = 0);
274 RootInlineBox* constructLine(unsigned runCount, BidiRun* firstRun, BidiRun* lastRun, bool firstLine, bool lastLine, RenderObject* endObject);
275 InlineFlowBox* createLineBoxes(RenderObject*, bool firstLine);
276 void computeHorizontalPositionsForLine(RootInlineBox*, bool firstLine, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd);
277 void computeVerticalPositionsForLine(RootInlineBox*, BidiRun*);
278 void checkLinesForOverflow();
279 void deleteEllipsisLineBoxes();
280 void checkLinesForTextOverflow();
281 // End of functions defined in RenderBlockLineLayout.cpp.
282
283 void paintFloats(PaintInfo&, int tx, int ty, bool preservePhase = false);
284 void paintContents(PaintInfo&, int tx, int ty);
285 void paintColumnContents(PaintInfo&, int tx, int ty, bool paintFloats = false);
286 void paintColumnRules(PaintInfo&, int tx, int ty);
287 void paintChildren(PaintInfo&, int tx, int ty);
288 void paintEllipsisBoxes(PaintInfo&, int tx, int ty);
289 void paintSelection(PaintInfo&, int tx, int ty);
290 void paintCaret(PaintInfo&, int tx, int ty, CaretType);
291
292 void insertFloatingObject(RenderBox*);
293 void removeFloatingObject(RenderBox*);
294
295 // Called from lineWidth, to position the floats added in the last line.
296 // Returns ture if and only if it has positioned any floats.
297 bool positionNewFloats();
298 void clearFloats();
299 int getClearDelta(RenderBox* child, int yPos);
300
301 virtual bool avoidsFloats() const;
302
hasOverhangingFloats()303 bool hasOverhangingFloats() { return parent() && !hasColumns() && floatBottom() > height(); }
304 void addIntrudingFloats(RenderBlock* prev, int xoffset, int yoffset);
305 int addOverhangingFloats(RenderBlock* child, int xoffset, int yoffset, bool makeChildPaintOtherFloats);
306
307 int nextFloatBottomBelow(int) const;
308 int floatBottom() const;
309 inline int leftBottom();
310 inline int rightBottom();
311
312 int rightOffset() const;
313 int leftOffset() const;
314 virtual bool hitTestColumns(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
315 virtual bool hitTestContents(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
316
317 virtual bool isPointInOverflowControl(HitTestResult&, int x, int y, int tx, int ty);
318
319 void calcInlinePrefWidths();
320 void calcBlockPrefWidths();
321
322 // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
323 // children.
324 virtual RenderBlock* firstLineBlock() const;
325 bool inRootBlockContext() const;
326
327 virtual IntRect rectWithOutlineForRepaint(RenderBoxModelObject* repaintContainer, int outlineWidth);
328 virtual RenderStyle* outlineStyleForRepaint() const;
329
330 virtual RenderObject* hoverAncestor() const;
331 virtual void updateDragState(bool dragOn);
332 virtual void childBecameNonInline(RenderObject* child);
333
selectionRectForRepaint(RenderBoxModelObject * repaintContainer,bool)334 virtual IntRect selectionRectForRepaint(RenderBoxModelObject* repaintContainer, bool /*clipToVisibleContent*/)
335 {
336 return selectionGapRectsForRepaint(repaintContainer);
337 }
338 virtual bool shouldPaintSelectionGaps() const;
339 bool isSelectionRoot() const;
340 GapRects fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,
341 int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* = 0);
342 GapRects fillInlineSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,
343 int& lastTop, int& lastLeft, int& lastRight, const PaintInfo*);
344 GapRects fillBlockSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,
345 int& lastTop, int& lastLeft, int& lastRight, const PaintInfo*);
346 IntRect fillVerticalSelectionGap(int lastTop, int lastLeft, int lastRight, int bottomY, RenderBlock* rootBlock,
347 int blockX, int blockY, const PaintInfo*);
348 int leftSelectionOffset(RenderBlock* rootBlock, int y);
349 int rightSelectionOffset(RenderBlock* rootBlock, int y);
350
351 virtual void absoluteRects(Vector<IntRect>&, int tx, int ty);
352 virtual void absoluteQuads(Vector<FloatQuad>&);
353
354 int desiredColumnWidth() const;
355 unsigned desiredColumnCount() const;
356 void setDesiredColumnCountAndWidth(int count, int width);
357
358 void paintContinuationOutlines(PaintInfo&, int tx, int ty);
359
360 virtual IntRect localCaretRect(InlineBox*, int caretOffset, int* extraWidthToEndOfLine = 0);
361
362 virtual void addFocusRingRects(GraphicsContext*, int tx, int ty);
363
364 void adjustPointToColumnContents(IntPoint&) const;
365 void adjustForBorderFit(int x, int& left, int& right) const; // Helper function for borderFitAdjust
366
367 void markLinesDirtyInVerticalRange(int top, int bottom);
368
369 void newLine(EClear);
370
371 Position positionForBox(InlineBox*, bool start = true) const;
372 Position positionForRenderer(RenderObject*, bool start = true) const;
373 VisiblePosition positionForPointWithInlineChildren(const IntPoint&);
374
375 // Adjust tx and ty from painting offsets to the local coords of this renderer
376 void offsetForContents(int& tx, int& ty) const;
377
378 void calcColumnWidth();
379 int layoutColumns(int endOfContent = -1);
380
381 bool expandsToEncloseOverhangingFloats() const;
382
383 void updateScrollInfoAfterLayout();
384
385 struct FloatingObject {
386 enum Type {
387 FloatLeft,
388 FloatRight
389 };
390
FloatingObjectFloatingObject391 FloatingObject(Type type)
392 : m_renderer(0)
393 , m_top(0)
394 , m_bottom(0)
395 , m_left(0)
396 , m_width(0)
397 , m_type(type)
398 , m_shouldPaint(true)
399 , m_isDescendant(false)
400 {
401 }
402
typeFloatingObject403 Type type() { return static_cast<Type>(m_type); }
404
405 RenderBox* m_renderer;
406 int m_top;
407 int m_bottom;
408 int m_left;
409 int m_width;
410 unsigned m_type : 1; // Type (left or right aligned)
411 bool m_shouldPaint : 1;
412 bool m_isDescendant : 1;
413 };
414
415 class MarginInfo {
416 // Collapsing flags for whether we can collapse our margins with our children's margins.
417 bool m_canCollapseWithChildren : 1;
418 bool m_canCollapseTopWithChildren : 1;
419 bool m_canCollapseBottomWithChildren : 1;
420
421 // Whether or not we are a quirky container, i.e., do we collapse away top and bottom
422 // margins in our container. Table cells and the body are the common examples. We
423 // also have a custom style property for Safari RSS to deal with TypePad blog articles.
424 bool m_quirkContainer : 1;
425
426 // This flag tracks whether we are still looking at child margins that can all collapse together at the beginning of a block.
427 // They may or may not collapse with the top margin of the block (|m_canCollapseTopWithChildren| tells us that), but they will
428 // always be collapsing with one another. This variable can remain set to true through multiple iterations
429 // as long as we keep encountering self-collapsing blocks.
430 bool m_atTopOfBlock : 1;
431
432 // This flag is set when we know we're examining bottom margins and we know we're at the bottom of the block.
433 bool m_atBottomOfBlock : 1;
434
435 // If our last normal flow child was a self-collapsing block that cleared a float,
436 // we track it in this variable.
437 bool m_selfCollapsingBlockClearedFloat : 1;
438
439 // These variables are used to detect quirky margins that we need to collapse away (in table cells
440 // and in the body element).
441 bool m_topQuirk : 1;
442 bool m_bottomQuirk : 1;
443 bool m_determinedTopQuirk : 1;
444
445 // These flags track the previous maximal positive and negative margins.
446 int m_posMargin;
447 int m_negMargin;
448
449 public:
450 MarginInfo(RenderBlock* b, int top, int bottom);
451
setAtTopOfBlock(bool b)452 void setAtTopOfBlock(bool b) { m_atTopOfBlock = b; }
setAtBottomOfBlock(bool b)453 void setAtBottomOfBlock(bool b) { m_atBottomOfBlock = b; }
clearMargin()454 void clearMargin() { m_posMargin = m_negMargin = 0; }
setSelfCollapsingBlockClearedFloat(bool b)455 void setSelfCollapsingBlockClearedFloat(bool b) { m_selfCollapsingBlockClearedFloat = b; }
setTopQuirk(bool b)456 void setTopQuirk(bool b) { m_topQuirk = b; }
setBottomQuirk(bool b)457 void setBottomQuirk(bool b) { m_bottomQuirk = b; }
setDeterminedTopQuirk(bool b)458 void setDeterminedTopQuirk(bool b) { m_determinedTopQuirk = b; }
setPosMargin(int p)459 void setPosMargin(int p) { m_posMargin = p; }
setNegMargin(int n)460 void setNegMargin(int n) { m_negMargin = n; }
setPosMarginIfLarger(int p)461 void setPosMarginIfLarger(int p) { if (p > m_posMargin) m_posMargin = p; }
setNegMarginIfLarger(int n)462 void setNegMarginIfLarger(int n) { if (n > m_negMargin) m_negMargin = n; }
463
setMargin(int p,int n)464 void setMargin(int p, int n) { m_posMargin = p; m_negMargin = n; }
465
atTopOfBlock()466 bool atTopOfBlock() const { return m_atTopOfBlock; }
canCollapseWithTop()467 bool canCollapseWithTop() const { return m_atTopOfBlock && m_canCollapseTopWithChildren; }
canCollapseWithBottom()468 bool canCollapseWithBottom() const { return m_atBottomOfBlock && m_canCollapseBottomWithChildren; }
canCollapseTopWithChildren()469 bool canCollapseTopWithChildren() const { return m_canCollapseTopWithChildren; }
canCollapseBottomWithChildren()470 bool canCollapseBottomWithChildren() const { return m_canCollapseBottomWithChildren; }
selfCollapsingBlockClearedFloat()471 bool selfCollapsingBlockClearedFloat() const { return m_selfCollapsingBlockClearedFloat; }
quirkContainer()472 bool quirkContainer() const { return m_quirkContainer; }
determinedTopQuirk()473 bool determinedTopQuirk() const { return m_determinedTopQuirk; }
topQuirk()474 bool topQuirk() const { return m_topQuirk; }
bottomQuirk()475 bool bottomQuirk() const { return m_bottomQuirk; }
posMargin()476 int posMargin() const { return m_posMargin; }
negMargin()477 int negMargin() const { return m_negMargin; }
margin()478 int margin() const { return m_posMargin - m_negMargin; }
479 };
480
481 void adjustPositionedBlock(RenderBox* child, const MarginInfo&);
482 void adjustFloatingBlock(const MarginInfo&);
483 bool handleSpecialChild(RenderBox* child, const MarginInfo&);
484 bool handleFloatingChild(RenderBox* child, const MarginInfo&);
485 bool handlePositionedChild(RenderBox* child, const MarginInfo&);
486 bool handleRunInChild(RenderBox* child);
487 int collapseMargins(RenderBox* child, MarginInfo&);
488 int clearFloatsIfNeeded(RenderBox* child, MarginInfo&, int oldTopPosMargin, int oldTopNegMargin, int yPos);
489 int estimateVerticalPosition(RenderBox* child, const MarginInfo&);
490 void determineHorizontalPosition(RenderBox* child);
491 void handleBottomOfBlock(int top, int bottom, MarginInfo&);
492 void setCollapsedBottomMargin(const MarginInfo&);
493 // End helper functions and structs used by layoutBlockChildren.
494
495 typedef ListHashSet<RenderBox*>::const_iterator Iterator;
496 DeprecatedPtrList<FloatingObject>* m_floatingObjects;
497 ListHashSet<RenderBox*>* m_positionedObjects;
498
499 // An inline can be split with blocks occurring in between the inline content.
500 // When this occurs we need a pointer to our next object. We can basically be
501 // split into a sequence of inlines and blocks. The continuation will either be
502 // an anonymous block (that houses other blocks) or it will be an inline flow.
503 RenderInline* m_inlineContinuation;
504
505 // Allocated only when some of these fields have non-default values
506 struct MaxMargin {
MaxMarginMaxMargin507 MaxMargin(const RenderBlock* o)
508 : m_topPos(topPosDefault(o))
509 , m_topNeg(topNegDefault(o))
510 , m_bottomPos(bottomPosDefault(o))
511 , m_bottomNeg(bottomNegDefault(o))
512 {
513 }
514
topPosDefaultMaxMargin515 static int topPosDefault(const RenderBlock* o) { return o->marginTop() > 0 ? o->marginTop() : 0; }
topNegDefaultMaxMargin516 static int topNegDefault(const RenderBlock* o) { return o->marginTop() < 0 ? -o->marginTop() : 0; }
bottomPosDefaultMaxMargin517 static int bottomPosDefault(const RenderBlock* o) { return o->marginBottom() > 0 ? o->marginBottom() : 0; }
bottomNegDefaultMaxMargin518 static int bottomNegDefault(const RenderBlock* o) { return o->marginBottom() < 0 ? -o->marginBottom() : 0; }
519
520 int m_topPos;
521 int m_topNeg;
522 int m_bottomPos;
523 int m_bottomNeg;
524 };
525
526 MaxMargin* m_maxMargin;
527
528 RenderObjectChildList m_children;
529 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>.
530
531 protected:
532 // How much content overflows out of our block vertically or horizontally.
533 int m_overflowHeight;
534 int m_overflowWidth;
535 int m_overflowLeft;
536 int m_overflowTop;
537
538 private:
539 mutable int m_lineHeight;
540 };
541
toRenderBlock(RenderObject * object)542 inline RenderBlock* toRenderBlock(RenderObject* object)
543 {
544 ASSERT(!object || object->isRenderBlock());
545 return static_cast<RenderBlock*>(object);
546 }
547
toRenderBlock(const RenderObject * object)548 inline const RenderBlock* toRenderBlock(const RenderObject* object)
549 {
550 ASSERT(!object || object->isRenderBlock());
551 return static_cast<const RenderBlock*>(object);
552 }
553
554 // This will catch anyone doing an unnecessary cast.
555 void toRenderBlock(const RenderBlock*);
556
557 } // namespace WebCore
558
559 #endif // RenderBlock_h
560