1 /*
2 * This file is part of the render object implementation for KHTML.
3 *
4 * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
5 * (C) 1999-2003 Antti Koivisto (koivisto@kde.org)
6 * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
7 * (C) 2003-2009 Apple Computer, Inc.
8 * (C) 2004-2009 Germain Garand (germain@ebooksfrance.org)
9 * (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
10 * (C) 2006 Charles Samuels (charles@kde.org)
11 *
12 * This library is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Library General Public
14 * License as published by the Free Software Foundation; either
15 * version 2 of the License, or (at your option) any later version.
16 *
17 * This library is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Library General Public License for more details.
21 *
22 * You should have received a copy of the GNU Library General Public License
23 * along with this library; see the file COPYING.LIB. If not, write to
24 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
25 * Boston, MA 02110-1301, USA.
26 *
27 */
28
29 //#define DEBUG
30 //#define DEBUG_LAYOUT
31 //#define BOX_DEBUG
32 //#define FLOAT_DEBUG
33 //#define PAGE_DEBUG
34
35 #include "render_block.h"
36
37 #include "khtml_debug.h"
38 #include <limits.h>
39 #include "render_text.h"
40 #include "render_table.h"
41 #include "render_canvas.h"
42 #include "render_layer.h"
43 #include "rendering/render_position.h"
44
45 #include <xml/dom_nodeimpl.h>
46 #include <xml/dom_docimpl.h>
47 #include <xml/dom_selection.h>
48 #include <html/html_formimpl.h>
49
50 #include <khtmlview.h>
51 #include <khtml_part.h>
52
53 using namespace DOM;
54
55 namespace khtml
56 {
57
58 // -------------------------------------------------------------------------------------------------------
59
60 // Our MarginInfo state used when laying out block children.
MarginInfo(RenderBlock * block,int top,int bottom)61 RenderBlock::MarginInfo::MarginInfo(RenderBlock *block, int top, int bottom)
62 {
63 // Whether or not we can collapse our own margins with our children. We don't do this
64 // if we had any border/padding (obviously), if we're the root or HTML elements, or if
65 // we're positioned, floating, a table cell.
66 m_canCollapseWithChildren = !block->isCanvas() && !block->isRoot() && !block->isPositioned() &&
67 !block->isFloating() && !block->isTableCell() && !block->hasOverflowClip() && !block->isInlineBlockOrInlineTable();
68
69 m_canCollapseTopWithChildren = m_canCollapseWithChildren && (top == 0) /*&& block->style()->marginTopCollapse() != MSEPARATE */;
70
71 // If any height other than auto is specified in CSS, then we don't collapse our bottom
72 // margins with our children's margins. To do otherwise would be to risk odd visual
73 // effects when the children overflow out of the parent block and yet still collapse
74 // with it. We also don't collapse if we have any bottom border/padding.
75 m_canCollapseBottomWithChildren = m_canCollapseWithChildren && (bottom == 0) &&
76 (block->style()->height().isAuto() && block->style()->height().isZero()) /*&& block->style()->marginBottomCollapse() != MSEPARATE*/;
77
78 m_quirkContainer = block->isTableCell() || block->isBody() /*|| block->style()->marginTopCollapse() == MDISCARD ||
79 block->style()->marginBottomCollapse() == MDISCARD*/;
80
81 m_atTopOfBlock = true;
82 m_atBottomOfBlock = false;
83
84 m_posMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(true) : 0;
85 m_negMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(false) : 0;
86
87 m_selfCollapsingBlockClearedFloat = false;
88
89 m_topQuirk = m_bottomQuirk = m_determinedTopQuirk = false;
90 }
91
92 // -------------------------------------------------------------------------------------------------------
93
RenderBlock(DOM::NodeImpl * node)94 RenderBlock::RenderBlock(DOM::NodeImpl *node)
95 : RenderFlow(node)
96 {
97 m_childrenInline = true;
98 m_floatingObjects = nullptr;
99 m_positionedObjects = nullptr;
100 m_firstLine = false;
101 m_avoidPageBreak = false;
102 m_clearStatus = CNONE;
103 m_maxTopPosMargin = m_maxTopNegMargin = m_maxBottomPosMargin = m_maxBottomNegMargin = 0;
104 m_topMarginQuirk = m_bottomMarginQuirk = false;
105 m_overflowHeight = m_overflowWidth = 0;
106 m_overflowLeft = m_overflowTop = 0;
107 }
108
~RenderBlock()109 RenderBlock::~RenderBlock()
110 {
111 if (m_floatingObjects) {
112 QListIterator<FloatingObject *> it(*m_floatingObjects);
113 while (it.hasNext()) {
114 delete it.next();
115 }
116 }
117 delete m_floatingObjects;
118 delete m_positionedObjects;
119 }
120
setStyle(RenderStyle * _style)121 void RenderBlock::setStyle(RenderStyle *_style)
122 {
123 setReplaced(_style->isDisplayReplacedType());
124
125 RenderFlow::setStyle(_style);
126
127 // ### we could save this call when the change only affected
128 // non inherited properties
129 RenderObject *child = firstChild();
130 while (child != nullptr) {
131 if (child->isAnonymousBlock()) {
132 RenderStyle *newStyle = new RenderStyle();
133 newStyle->inheritFrom(style());
134 newStyle->setDisplay(BLOCK);
135 child->setStyle(newStyle);
136 }
137 child = child->nextSibling();
138 }
139
140 if (attached()) {
141 // Update generated content and ::inside
142 updateReplacedContent();
143 // Update pseudos for :before and :after
144 updatePseudoChildren();
145 }
146
147 // handled by close() during parsing
148 // ### remove close move upto updatePseudo
149 if (!document()->parsing()) {
150 updateFirstLetter();
151 }
152 }
153
154 // Attach handles initial setStyle that requires parent nodes
attach()155 void RenderBlock::attach()
156 {
157 RenderFlow::attach();
158
159 updateReplacedContent();
160 updatePseudoChildren();
161 }
162
isFirstLetterPunct(const QChar * c)163 static inline bool isFirstLetterPunct(const QChar *c)
164 {
165 // CSS2.1/3 definition for ::first-letter doesn't include Pc or Pd.
166 if (c->isPunct()) {
167 QChar::Category cat = c->category();
168 return cat != QChar::Punctuation_Connector &&
169 cat != QChar::Punctuation_Dash;
170 }
171 return false;
172 }
173
updateFirstLetter()174 void RenderBlock::updateFirstLetter()
175 {
176 // Only blocks with inline-children can generate a first-letter
177 if (!childrenInline() || !firstChild()) {
178 return;
179 }
180
181 // Don't recurse
182 if (style()->styleType() == RenderStyle::FIRST_LETTER) {
183 return;
184 }
185
186 // The first-letter style is inheritable.
187 RenderStyle *pseudoStyle = style()->getPseudoStyle(RenderStyle::FIRST_LETTER);
188 RenderObject *o = this;
189 while (o && !pseudoStyle) {
190 // ### We should ignore empty preceding siblings
191 if (o->parent() && o->parent()->firstChild() == this) {
192 o = o->parent();
193 } else {
194 break;
195 }
196 pseudoStyle = o->style()->getPseudoStyle(RenderStyle::FIRST_LETTER);
197 };
198
199 // FIXME: Currently we don't delete first-letters, this is
200 // handled instead in NodeImpl::diff by issuing Detach on first-letter changes.
201 if (!pseudoStyle) {
202 return;
203 }
204
205 // Drill into inlines looking for our first text child.
206 RenderObject *firstText = firstChild();
207 while (firstText && firstText->needsLayout() && !firstText->isFloating() && !firstText->isRenderBlock() && !firstText->isReplaced() && !firstText->isText())
208 // ### We should skip first children with only white-space and punctuation
209 {
210 firstText = firstText->firstChild();
211 }
212
213 if (firstText && firstText->isText() && !firstText->isBR()) {
214 RenderObject *firstLetterObject = nullptr;
215 // Find the old first-letter
216 if (firstText->parent()->style()->styleType() == RenderStyle::FIRST_LETTER) {
217 firstLetterObject = firstText->parent();
218 }
219
220 // Force inline display (except for floating first-letters)
221 pseudoStyle->setDisplay(pseudoStyle->isFloating() ? BLOCK : INLINE);
222 pseudoStyle->setPosition(PSTATIC); // CSS2 says first-letter can't be positioned.
223
224 if (firstLetterObject != nullptr) {
225 firstLetterObject->setStyle(pseudoStyle);
226 RenderStyle *newStyle = new RenderStyle();
227 newStyle->inheritFrom(pseudoStyle);
228 firstText->setStyle(newStyle);
229 return;
230 }
231
232 RenderText *textObj = static_cast<RenderText *>(firstText);
233 RenderObject *firstLetterContainer = firstText->parent();
234
235 firstLetterObject = RenderFlow::createFlow(node(), pseudoStyle, renderArena());
236 firstLetterObject->setIsAnonymous(true);
237 firstLetterContainer->addChild(firstLetterObject, firstLetterContainer->firstChild());
238
239 // if this object is the result of a :begin, then the text may have not been
240 // generated yet if it is a counter
241 if (textObj->recalcMinMax()) {
242 textObj->recalcMinMaxWidths();
243 }
244
245 // The original string is going to be either a generated content string or a DOM node's
246 // string. We want the original string before it got transformed in case first-letter has
247 // no text-transform or a different text-transform applied to it.
248 DOMStringImpl *oldText = textObj->originalString();
249 if (!oldText) {
250 oldText = textObj->string();
251 }
252 // ### In theory a first-letter can stretch across multiple text objects, if they only contain
253 // punctuation and white-space
254 if (oldText->l >= 1) {
255 oldText->ref();
256 // begin: we need skip leading whitespace so that RenderBlock::findNextLineBreak
257 // won't think we're continuing from a previous run
258 unsigned int begin = 0; // the position that first-letter begins
259 unsigned int length = 0; // the position that "the rest" begins
260 while (length < oldText->l && (oldText->s + length)->isSpace()) {
261 length++;
262 }
263 begin = length;
264 while (length < oldText->l &&
265 (isFirstLetterPunct(oldText->s + length) || (oldText->s + length)->isSpace())) {
266 length++;
267 }
268 if (length < oldText->l &&
269 !((oldText->s + length)->isSpace() || isFirstLetterPunct(oldText->s + length))) {
270 length++;
271 }
272 while (length < oldText->l && isFirstLetterPunct(oldText->s + length)) {
273 length++;
274 }
275
276 // we need to generated a remainingText object even if no text is left
277 // because it holds the place and style for the old textObj
278 RenderTextFragment *remainingText =
279 new(renderArena()) RenderTextFragment(textObj->node(), oldText, length, oldText->l - length);
280 remainingText->setIsAnonymous(textObj->isAnonymous());
281 remainingText->setStyle(textObj->style());
282 if (remainingText->element()) {
283 remainingText->element()->setRenderer(remainingText);
284 }
285
286 RenderObject *nextObj = textObj->nextSibling();
287 textObj->detach();
288 firstLetterContainer->addChild(remainingText, nextObj);
289
290 RenderTextFragment *letter =
291 new(renderArena()) RenderTextFragment(remainingText->node(), oldText, begin, length - begin);
292 letter->setIsAnonymous(remainingText->isAnonymous());
293 RenderStyle *newStyle = new RenderStyle();
294 newStyle->inheritFrom(pseudoStyle);
295 letter->setStyle(newStyle);
296 firstLetterObject->addChild(letter);
297 oldText->deref();
298
299 remainingText->setFirstLetter(letter);
300 }
301 firstLetterObject->close();
302 }
303 }
304
addChildToFlow(RenderObject * newChild,RenderObject * beforeChild)305 void RenderBlock::addChildToFlow(RenderObject *newChild, RenderObject *beforeChild)
306 {
307 // Make sure we don't append things after :after-generated content if we have it.
308 if (!beforeChild && lastChild() && lastChild()->style()->styleType() == RenderStyle::AFTER) {
309 beforeChild = lastChild();
310 }
311
312 bool madeBoxesNonInline = false;
313
314 // If the requested beforeChild is not one of our children, then this is most likely because
315 // there is an anonymous block box within this object that contains the beforeChild. So
316 // just insert the child into the anonymous block box instead of here. This may also be
317 // needed in cases of things like anonymous tables.
318 if (beforeChild && beforeChild->parent() != this) {
319
320 KHTMLAssert(beforeChild->parent());
321
322 // In the special case where we are prepending a block-level element before
323 // something contained inside an anonymous block, we can just prepend it before
324 // the anonymous block.
325 if (!newChild->isInline() && beforeChild->parent()->isAnonymousBlock() &&
326 beforeChild->parent()->parent() == this &&
327 beforeChild->parent()->firstChild() == beforeChild) {
328 return addChildToFlow(newChild, beforeChild->parent());
329 }
330
331 // Otherwise find our kid inside which the beforeChild is, and delegate to it.
332 // This may be many levels deep due to anonymous tables, table sections, etc.
333 RenderObject *responsible = beforeChild->parent();
334 while (responsible->parent() != this) {
335 responsible = responsible->parent();
336 }
337
338 return responsible->addChild(newChild, beforeChild);
339 }
340
341 // prevent elements that haven't received a layout yet from getting painted by pushing
342 // them far above the top of the page
343 if (!newChild->isInline()) {
344 newChild->setPos(newChild->xPos(), -500000);
345 }
346
347 // A block has to either have all of its children inline, or all of its children as blocks.
348 // So, if our children are currently inline and a block child has to be inserted, we move all our
349 // inline children into anonymous block boxes
350 if (m_childrenInline && !newChild->isInline() && !newChild->isFloatingOrPositioned()) {
351 // This is a block with inline content. Wrap the inline content in anonymous blocks.
352 makeChildrenNonInline(beforeChild);
353 madeBoxesNonInline = true;
354
355 if (beforeChild && beforeChild->parent() != this) {
356 beforeChild = beforeChild->parent();
357 KHTMLAssert(beforeChild->isAnonymousBlock());
358 KHTMLAssert(beforeChild->parent() == this);
359 }
360 } else if (!m_childrenInline && !newChild->isFloatingOrPositioned()) {
361 // If we're inserting an inline child but all of our children are blocks, then we have to make sure
362 // it is put into an anomyous block box. We try to use an existing anonymous box if possible, otherwise
363 // a new one is created and inserted into our list of children in the appropriate position.
364 if (newChild->isInline()) {
365 if (beforeChild) {
366 if (beforeChild->previousSibling() && beforeChild->previousSibling()->isAnonymousBlock()) {
367 beforeChild->previousSibling()->addChild(newChild);
368 return;
369 }
370 } else {
371 if (m_last && m_last->isAnonymousBlock()) {
372 m_last->addChild(newChild);
373 return;
374 }
375 }
376
377 // no suitable existing anonymous box - create a new one
378 RenderBlock *newBox = createAnonymousBlock();
379 RenderBox::addChild(newBox, beforeChild);
380 newBox->addChild(newChild);
381
382 //the above may actually destroy newBox in case an anonymous
383 //table got created, and made the anonymous block redundant.
384 //so look up what to hide indirectly.
385 RenderObject *toHide = newChild;
386 while (toHide->parent() != this) {
387 toHide = toHide->parent();
388 }
389
390 toHide->setPos(toHide->xPos(), -500000);
391 return;
392 } else {
393 // We are adding another block child... if the current last child is an anonymous box
394 // then it needs to be closed.
395 // ### get rid of the closing thing altogether this will only work during initial parsing
396 if (lastChild() && lastChild()->isAnonymous()) {
397 lastChild()->close();
398 }
399 }
400 }
401
402 RenderBox::addChild(newChild, beforeChild);
403 // ### care about aligned stuff
404
405 if (madeBoxesNonInline && isAnonymousBlock()) {
406 parent()->removeSuperfluousAnonymousBlockChild(this);
407 }
408 // we might be deleted now
409 }
410
getInlineRun(RenderObject * start,RenderObject * stop,RenderObject * & inlineRunStart,RenderObject * & inlineRunEnd)411 static void getInlineRun(RenderObject *start, RenderObject *stop,
412 RenderObject *&inlineRunStart,
413 RenderObject *&inlineRunEnd)
414 {
415 // Beginning at |start| we find the largest contiguous run of inlines that
416 // we can. We denote the run with start and end points, |inlineRunStart|
417 // and |inlineRunEnd|. Note that these two values may be the same if
418 // we encounter only one inline.
419 //
420 // We skip any non-inlines we encounter as long as we haven't found any
421 // inlines yet.
422 //
423 //
424 // |stop| indicates a non-inclusive stop point. Regardless of whether |stop|
425 // is inline or not, we will not include it in a run with inlines before it. It's as though we encountered
426 // a non-inline.
427
428 RenderObject *curr = start;
429 bool sawInline;
430 do {
431 while (curr && !(curr->isInline() || curr->isFloatingOrPositioned())) {
432 curr = curr->nextSibling();
433 }
434
435 inlineRunStart = inlineRunEnd = curr;
436
437 if (!curr) {
438 return; // No more inline children to be found.
439 }
440
441 sawInline = curr->isInline();
442
443 curr = curr->nextSibling();
444 while (curr && (curr->isInline() || curr->isFloatingOrPositioned()) && (curr != stop)) {
445 inlineRunEnd = curr;
446 if (curr->isInline()) {
447 sawInline = true;
448 }
449 curr = curr->nextSibling();
450 }
451 } while (!sawInline);
452
453 }
454
deleteLineBoxTree()455 void RenderBlock::deleteLineBoxTree()
456 {
457 InlineFlowBox *line = m_firstLineBox;
458 InlineFlowBox *nextLine;
459 while (line) {
460 nextLine = line->nextFlowBox();
461 line->deleteLine(renderArena());
462 line = nextLine;
463 }
464 m_firstLineBox = m_lastLineBox = nullptr;
465 }
466
baselinePosition(bool firstLine) const467 short RenderBlock::baselinePosition(bool firstLine) const
468 {
469 // CSS2.1-10.8.1 "The baseline of an 'inline-block' is the baseline of its last line box
470 // in the normal flow, unless it has either no in-flow line boxes or if its 'overflow'
471 // property has a computed value other than 'visible', in which case the baseline is the bottom margin edge."
472
473 if (isReplaced() && !hasOverflowClip() && !needsLayout()) {
474 int res = getBaselineOfLastLineBox();
475 if (res != -1) {
476 return res + marginTop();
477 }
478 }
479 return RenderBox::baselinePosition(firstLine);
480 }
481
getBaselineOfLastLineBox() const482 int RenderBlock::getBaselineOfLastLineBox() const
483 {
484 if (!isBlockFlow()) {
485 return -1;
486 }
487
488 if (childrenInline()) {
489 // if (!firstLineBox() && hasLineIfEmpty())
490 // return RenderFlow::baselinePosition(true) + borderTop() + paddingTop();
491 if (lastLineBox()) {
492 return lastLineBox()->yPos() + lastLineBox()->baseline();
493 }
494 return -1;
495 } else {
496 // bool haveNormalFlowChild = false;
497 for (RenderObject *curr = lastChild(); curr; curr = curr->previousSibling()) {
498 if (!curr->isFloatingOrPositioned() && curr->isBlockFlow()) {
499 // haveNormalFlowChild = true;
500 int result = static_cast<RenderBlock *>(curr)->getBaselineOfLastLineBox();
501 if (result != -1) {
502 return curr->yPos() + result; // Translate to our coordinate space.
503 }
504 }
505 }
506 // if (!haveNormalFlowChild && isRenderButton()) // hasLineIfEmpty()
507 // return RenderFlow::baselinePosition(true) + borderTop() + paddingTop();
508 }
509
510 return -1;
511 }
512
makeChildrenNonInline(RenderObject * insertionPoint)513 void RenderBlock::makeChildrenNonInline(RenderObject *insertionPoint)
514 {
515 // makeChildrenNonInline takes a block whose children are *all* inline and it
516 // makes sure that inline children are coalesced under anonymous
517 // blocks. If |insertionPoint| is defined, then it represents the insertion point for
518 // the new block child that is causing us to have to wrap all the inlines. This
519 // means that we cannot coalesce inlines before |insertionPoint| with inlines following
520 // |insertionPoint|, because the new child is going to be inserted in between the inlines,
521 // splitting them.
522 KHTMLAssert(isReplacedBlock() || !isInline());
523 KHTMLAssert(!insertionPoint || insertionPoint->parent() == this);
524
525 deleteLineBoxTree();
526
527 m_childrenInline = false;
528
529 RenderObject *child = firstChild();
530
531 while (child) {
532 RenderObject *inlineRunStart, *inlineRunEnd;
533 getInlineRun(child, insertionPoint, inlineRunStart, inlineRunEnd);
534
535 if (!inlineRunStart) {
536 break;
537 }
538
539 child = inlineRunEnd->nextSibling();
540
541 RenderBlock *box = createAnonymousBlock();
542 insertChildNode(box, inlineRunStart);
543 RenderObject *o = inlineRunStart;
544 while (o != inlineRunEnd) {
545 RenderObject *no = o;
546 o = no->nextSibling();
547 box->appendChildNode(removeChildNode(no));
548 }
549 box->appendChildNode(removeChildNode(inlineRunEnd));
550 box->close();
551 box->setPos(box->xPos(), -500000);
552 }
553 }
554
makePageBreakAvoidBlocks()555 void RenderBlock::makePageBreakAvoidBlocks()
556 {
557 KHTMLAssert(!childrenInline());
558 KHTMLAssert(canvas()->pagedMode());
559
560 RenderObject *breakAfter = firstChild();
561 RenderObject *breakBefore = breakAfter ? breakAfter->nextSibling() : nullptr;
562
563 RenderBlock *pageRun = nullptr;
564
565 // ### Should follow margin-collapsing rules, skipping self-collapsing blocks
566 // and exporting page-breaks from first/last child when collapsing with parent margin.
567 while (breakAfter) {
568 if (breakAfter->isRenderBlock() && !breakAfter->childrenInline()) {
569 static_cast<RenderBlock *>(breakAfter)->makePageBreakAvoidBlocks();
570 }
571 EPageBreak pbafter = breakAfter->style()->pageBreakAfter();
572 EPageBreak pbbefore = breakBefore ? breakBefore->style()->pageBreakBefore() : PBALWAYS;
573 if ((pbafter == PBAVOID && pbbefore == PBAVOID) ||
574 (pbafter == PBAVOID && pbbefore == PBAUTO) ||
575 (pbafter == PBAUTO && pbbefore == PBAVOID)) {
576 if (!pageRun) {
577 pageRun = createAnonymousBlock();
578 pageRun->m_avoidPageBreak = true;
579 pageRun->setChildrenInline(false);
580 }
581 pageRun->appendChildNode(removeChildNode(breakAfter));
582 } else {
583 if (pageRun) {
584 pageRun->appendChildNode(removeChildNode(breakAfter));
585 pageRun->close();
586 insertChildNode(pageRun, breakBefore);
587 pageRun = nullptr;
588 }
589 }
590 breakAfter = breakBefore;
591 breakBefore = breakBefore ? breakBefore->nextSibling() : nullptr;
592 }
593
594 // recurse into positioned block children as well.
595 if (m_positionedObjects) {
596 RenderObject *obj;
597 QListIterator<RenderObject *> it(*m_positionedObjects);
598 while (it.hasNext()) {
599 obj = it.next();
600 if (obj->isRenderBlock() && !obj->childrenInline()) {
601 static_cast<RenderBlock *>(obj)->makePageBreakAvoidBlocks();
602 }
603 }
604 }
605
606 // recurse into floating block children.
607 if (m_floatingObjects) {
608 FloatingObject *obj;
609 QListIterator<FloatingObject *> it(*m_floatingObjects);
610 while (it.hasNext()) {
611 obj = it.next();
612 if (obj->node->isRenderBlock() && !obj->node->childrenInline()) {
613 static_cast<RenderBlock *>(obj->node)->makePageBreakAvoidBlocks();
614 }
615 }
616 }
617 }
618
removeChild(RenderObject * oldChild)619 void RenderBlock::removeChild(RenderObject *oldChild)
620 {
621 // If this child is a block, and if our previous and next siblings are
622 // both anonymous blocks with inline content, then we can go ahead and
623 // fold the inline content back together.
624 RenderObject *prev = oldChild->previousSibling();
625 RenderObject *next = oldChild->nextSibling();
626 RenderObject *lc = nullptr;
627 bool mergedBlocks = false;
628 bool checkContinuationMerge = false;
629 if (!documentBeingDestroyed() && !isInline() && !oldChild->isInline() && !oldChild->continuation()) {
630 if (prev && prev->isAnonymousBlock() && prev->childrenInline() &&
631 next && next->isAnonymousBlock() && next->childrenInline()) {
632 // Take all the children out of the |next| block and put them in
633 // the |prev| block.
634 RenderObject *o = next->firstChild();
635 while (o) {
636 RenderObject *no = o;
637 o = no->nextSibling();
638 prev->appendChildNode(next->removeChildNode(no));
639 }
640
641 // Detach the now-empty block.
642 static_cast<RenderBlock *>(next)->deleteLineBoxTree();
643 next->detach();
644
645 mergedBlocks = true;
646 }
647
648 // Check if there are continuations we could merge
649 checkContinuationMerge = (mergedBlocks || (!prev && !next)) && continuation() && isAnonymousBlock() && continuation()->isRenderInline() &&
650 previousSibling() && previousSibling()->isAnonymousBlock() && (lc = previousSibling()->lastChild());
651
652 if (checkContinuationMerge) {
653 while (lc->lastChild() && lc->continuation()) {
654 lc = lc->lastChild();
655 }
656 checkContinuationMerge = lc->isRenderInline() && lc->continuation() && (lc->continuation() == this);
657 }
658 if (checkContinuationMerge) {
659 RenderObject *prev = lc->parent();
660 RenderObject *cont = continuation()->parent();
661 while (prev && cont) {
662 if (prev == previousSibling() && cont == nextSibling() && cont->isAnonymousBlock()) {
663 break;
664 }
665 if (!prev->continuation() || prev->continuation() != cont) {
666 checkContinuationMerge = false;
667 break;
668 }
669 prev = prev->parent();
670 cont = cont->parent();
671 }
672 }
673 }
674
675 RenderFlow::removeChild(oldChild);
676
677 if (mergedBlocks && prev && !prev->previousSibling() && !prev->nextSibling()) {
678 // The remerge has knocked us down to containing only a single anonymous
679 // box. We can go ahead and pull the content right back up into our
680 // box.
681 RenderBlock *anonBlock = static_cast<RenderBlock *>(prev);
682 m_childrenInline = true;
683 RenderObject *o = anonBlock->firstChild();
684 while (o) {
685 RenderObject *no = o;
686 o = no->nextSibling();
687 appendChildNode(anonBlock->removeChildNode(no));
688 }
689
690 // Detach the now-empty block.
691 anonBlock->deleteLineBoxTree();
692 anonBlock->detach();
693 }
694 if (checkContinuationMerge && ((!prev && !next) || m_childrenInline)) {
695 // |oldChild| was a block that split an inline into continuations.
696 // Now that we only have inline content left, we may merge back those continuations
697 // into a single inline.
698 assert(lc->isRenderInline());
699 RenderFlow *prev = static_cast<RenderFlow *>(lc);
700 while (RenderFlow *next = prev->continuation()) {
701 RenderObject *o = next->firstChild();
702 while (o) {
703 RenderObject *no = o;
704 o = no->nextSibling();
705 prev->appendChildNode(next->removeChildNode(no));
706 }
707 prev->setContinuation(next->continuation());
708 next->setContinuation(nullptr);
709 if (next != this) {
710 next->detach();
711 prev = static_cast<RenderFlow *>(prev->parent());
712 assert(!prev || prev->isRenderInline() || prev->isRenderBlock());
713 }
714 }
715 assert(nextSibling() && nextSibling()->isAnonymousBlock());
716 if (!nextSibling()->firstChild()) {
717 static_cast<RenderBlock *>(nextSibling())->deleteLineBoxTree();
718 nextSibling()->detach();
719 }
720 deleteLineBoxTree();
721 detach();
722 }
723 }
724
isSelfCollapsingBlock() const725 bool RenderBlock::isSelfCollapsingBlock() const
726 {
727 // We are not self-collapsing if we
728 // (a) have a non-zero height according to layout (an optimization to avoid wasting time)
729 // (b) are a table,
730 // (c) have border/padding,
731 // (d) have a min-height
732 if (m_height > 0 ||
733 isTable() || (borderBottom() + paddingBottom() + borderTop() + paddingTop()) != 0 ||
734 style()->minHeight().isPositive()) {
735 return false;
736 }
737
738 bool hasAutoHeight = style()->height().isAuto();
739 if (style()->height().isPercent() && !style()->htmlHacks()) {
740 hasAutoHeight = true;
741 for (RenderBlock *cb = containingBlock(); !cb->isCanvas(); cb = cb->containingBlock()) {
742 if (cb->style()->height().isFixed() || cb->isTableCell()) {
743 hasAutoHeight = false;
744 }
745 }
746 }
747
748 // If the height is 0 or auto, then whether or not we are a self-collapsing block depends
749 // on whether we have content that is all self-collapsing or not.
750 if (hasAutoHeight || ((style()->height().isFixed() || style()->height().isPercent()) && style()->height().isZero())) {
751 // If the block has inline children, see if we generated any line boxes. If we have any
752 // line boxes, then we can't be self-collapsing, since we have content.
753 if (childrenInline()) {
754 return !firstLineBox();
755 }
756
757 // Whether or not we collapse is dependent on whether all our normal flow children
758 // are also self-collapsing.
759 for (RenderObject *child = firstChild(); child; child = child->nextSibling()) {
760 if (child->isFloatingOrPositioned()) {
761 continue;
762 }
763 if (!child->isSelfCollapsingBlock()) {
764 return false;
765 }
766 }
767 return true;
768 }
769 return false;
770 }
771
layout()772 void RenderBlock::layout()
773 {
774 // Table cells call layoutBlock directly, so don't add any logic here. Put code into
775 // layoutBlock().
776 layoutBlock(false);
777 }
778
layoutBlock(bool relayoutChildren)779 void RenderBlock::layoutBlock(bool relayoutChildren)
780 {
781 if (isInline() && !isReplacedBlock()) {
782 setNeedsLayout(false);
783 return;
784 }
785 // qCDebug(KHTML_LOG) << renderName() << " " << this << "::layoutBlock() start";
786 // QTime t;
787 // t.start();
788 KHTMLAssert(needsLayout());
789 KHTMLAssert(minMaxKnown());
790
791 if (canvas()->pagedMode()) {
792 relayoutChildren = true;
793 }
794
795 if (markedForRepaint()) {
796 repaintDuringLayout();
797 setMarkedForRepaint(false);
798 }
799
800 if (!relayoutChildren && posChildNeedsLayout() && !normalChildNeedsLayout() && !selfNeedsLayout()) {
801 // All we have to is lay out our positioned objects.
802 layoutPositionedObjects(relayoutChildren);
803 if (hasOverflowClip()) {
804 m_layer->checkScrollbarsAfterLayout();
805 }
806 setNeedsLayout(false);
807 return;
808 }
809
810 int oldWidth = m_width;
811
812 calcWidth();
813 m_overflowWidth = m_width;
814 m_overflowLeft = 0;
815 if (style()->direction() == LTR) {
816 int cw = 0;
817 if (style()->textIndent().isPercent()) {
818 cw = containingBlock()->contentWidth();
819 }
820 m_overflowLeft = qMin(0, style()->textIndent().minWidth(cw));
821 }
822
823 if (oldWidth != m_width) {
824 relayoutChildren = true;
825 }
826
827 // qCDebug(KHTML_LOG) << floatingObjects << "," << oldWidth << ","
828 // << m_width << ","<< needsLayout() << "," << isAnonymousBox() << ","
829 // << isPositioned();
830
831 #ifdef DEBUG_LAYOUT
832 qCDebug(KHTML_LOG) << renderName() << "(RenderBlock) " << this << " ::layout() width=" << m_width << ", needsLayout=" << needsLayout();
833 if (containingBlock() == static_cast<RenderObject *>(this)) {
834 qCDebug(KHTML_LOG) << renderName() << ": containingBlock == this";
835 }
836 #endif
837
838 clearFloats();
839
840 int previousHeight = m_height;
841 m_height = 0;
842 m_overflowHeight = 0;
843 m_clearStatus = CNONE;
844
845 // We use four values, maxTopPos, maxPosNeg, maxBottomPos, and maxBottomNeg, to track
846 // our current maximal positive and negative margins. These values are used when we
847 // are collapsed with adjacent blocks, so for example, if you have block A and B
848 // collapsing together, then you'd take the maximal positive margin from both A and B
849 // and subtract it from the maximal negative margin from both A and B to get the
850 // true collapsed margin. This algorithm is recursive, so when we finish layout()
851 // our block knows its current maximal positive/negative values.
852 //
853 // Start out by setting our margin values to our current margins. Table cells have
854 // no margins, so we don't fill in the values for table cells.
855 if (!isTableCell()) {
856 initMaxMarginValues();
857
858 m_topMarginQuirk = style()->marginTop().isQuirk();
859 m_bottomMarginQuirk = style()->marginBottom().isQuirk();
860
861 if (element() && element()->id() == ID_FORM && static_cast<HTMLFormElementImpl *>(element())->isMalformed())
862 // See if this form is malformed (i.e., unclosed). If so, don't give the form
863 // a bottom margin.
864 {
865 m_maxBottomPosMargin = m_maxBottomNegMargin = 0;
866 }
867 }
868
869 if (scrollsOverflow() && m_layer) {
870 // For overflow:scroll blocks, ensure we have both scrollbars in place always.
871 if (style()->overflowX() == OSCROLL) {
872 m_layer->showScrollbar(Qt::Horizontal, true);
873 }
874 if (style()->overflowY() == OSCROLL) {
875 m_layer->showScrollbar(Qt::Vertical, true);
876 }
877 }
878
879 setContainsPageBreak(false);
880
881 if (childrenInline()) {
882 layoutInlineChildren(relayoutChildren);
883 } else {
884 layoutBlockChildren(relayoutChildren);
885 }
886
887 // Expand our intrinsic height to encompass floats.
888 int toAdd = borderBottom() + paddingBottom();
889 if (m_layer && scrollsOverflowX() && style()->height().isAuto()) {
890 toAdd += m_layer->horizontalScrollbarHeight();
891 }
892 if (floatBottom() + toAdd > m_height && (isFloatingOrPositioned() || flowAroundFloats())) {
893 m_overflowHeight = m_height = floatBottom() + toAdd;
894 }
895
896 int oldHeight = m_height;
897 calcHeight();
898 if (oldHeight != m_height) {
899 m_overflowHeight -= toAdd;
900 if (m_layer && scrollsOverflowY()) {
901 // overflow-height only includes padding-bottom when it scrolls
902 m_overflowHeight += paddingBottom();
903 }
904 // If the block got expanded in size, then increase our overflowheight to match.
905 if (m_overflowHeight < m_height) {
906 m_overflowHeight = m_height;
907 }
908 }
909 if (previousHeight != m_height) {
910 relayoutChildren = true;
911 }
912
913 if (isTableCell()) {
914 // Table cells need to grow to accommodate both overhanging floats and
915 // blocks that have overflowed content.
916 // Check for an overhanging float first.
917 // FIXME: This needs to look at the last flow, not the last child.
918 if (lastChild() && lastChild()->hasOverhangingFloats() && !lastChild()->hasOverflowClip()) {
919 KHTMLAssert(lastChild()->isRenderBlock());
920 m_height = lastChild()->yPos() + static_cast<RenderBlock *>(lastChild())->floatBottom();
921 m_height += borderBottom() + paddingBottom();
922 }
923
924 if (m_overflowHeight > m_height && !hasOverflowClip()) {
925 m_height = m_overflowHeight + borderBottom() + paddingBottom();
926 }
927 }
928
929 if (hasOverhangingFloats() && ((isFloating() && style()->height().isAuto()) || isTableCell())) {
930 m_height = floatBottom();
931 m_height += borderBottom() + paddingBottom();
932 }
933
934 if (canvas()->pagedMode()) {
935 #ifdef PAGE_DEBUG
936 qCDebug(KHTML_LOG) << renderName() << " Page Bottom: " << pageTopAfter(0);
937 qCDebug(KHTML_LOG) << renderName() << " Bottom: " << m_height;
938 #endif
939 bool needsPageBreak = false;
940 int xpage = crossesPageBreak(0, m_height);
941 if (xpage) {
942 needsPageBreak = true;
943 #ifdef PAGE_DEBUG
944 qCDebug(KHTML_LOG) << renderName() << " crosses to page " << xpage;
945 #endif
946 }
947 if (needsPageBreak && !containsPageBreak()) {
948 setNeedsPageClear(true);
949 #ifdef PAGE_DEBUG
950 qCDebug(KHTML_LOG) << renderName() << " marked for page-clear";
951 #endif
952 }
953 }
954
955 layoutPositionedObjects(relayoutChildren);
956
957 // Always ensure our overflow width/height are at least as large as our width/height.
958 m_overflowWidth = qMax(m_overflowWidth, (int)m_width);
959 m_overflowHeight = qMax(m_overflowHeight, m_height);
960
961 // Update our scrollbars if we're overflow:auto/scroll now that we know if
962 // we overflow or not.
963 if (hasOverflowClip() && m_layer) {
964 m_layer->checkScrollbarsAfterLayout();
965 }
966
967 setNeedsLayout(false);
968 }
969
adjustPositionedBlock(RenderObject * child,const MarginInfo & marginInfo)970 void RenderBlock::adjustPositionedBlock(RenderObject *child, const MarginInfo &marginInfo)
971 {
972 if (child->isBox() && child->hasStaticX()) {
973 if (style()->direction() == LTR) {
974 static_cast<RenderBox *>(child)->setStaticX(borderLeft() + paddingLeft());
975 } else {
976 static_cast<RenderBox *>(child)->setStaticX(borderRight() + paddingRight());
977 }
978 }
979
980 if (child->isBox() && child->hasStaticY()) {
981 int y = m_height;
982 if (!marginInfo.canCollapseWithTop()) {
983 child->calcVerticalMargins();
984 int marginTop = child->marginTop();
985 int collapsedTopPos = marginInfo.posMargin();
986 int collapsedTopNeg = marginInfo.negMargin();
987 if (marginTop > 0) {
988 if (marginTop > collapsedTopPos) {
989 collapsedTopPos = marginTop;
990 }
991 } else {
992 if (-marginTop > collapsedTopNeg) {
993 collapsedTopNeg = -marginTop;
994 }
995 }
996 y += (collapsedTopPos - collapsedTopNeg) - marginTop;
997 }
998 static_cast<RenderBox *>(child)->setStaticY(y);
999 }
1000 }
1001
adjustFloatingBlock(const MarginInfo & marginInfo)1002 void RenderBlock::adjustFloatingBlock(const MarginInfo &marginInfo)
1003 {
1004 // The float should be positioned taking into account the bottom margin
1005 // of the previous flow. We add that margin into the height, get the
1006 // float positioned properly, and then subtract the margin out of the
1007 // height again. In the case of self-collapsing blocks, we always just
1008 // use the top margins, since the self-collapsing block collapsed its
1009 // own bottom margin into its top margin.
1010 //
1011 // Note also that the previous flow may collapse its margin into the top of
1012 // our block. If this is the case, then we do not add the margin in to our
1013 // height when computing the position of the float. This condition can be tested
1014 // for by simply calling canCollapseWithTop. See
1015 // https://www.hixie.ch/tests/adhoc/css/box/block/margin-collapse/046.html for
1016 // an example of this scenario.
1017 int marginOffset = marginInfo.canCollapseWithTop() ? 0 : marginInfo.margin();
1018 m_height += marginOffset;
1019 positionNewFloats();
1020 m_height -= marginOffset;
1021 }
1022
handleSpecialChild(RenderObject * child,const MarginInfo & marginInfo,CompactInfo & compactInfo,bool & handled)1023 RenderObject *RenderBlock::handleSpecialChild(RenderObject *child, const MarginInfo &marginInfo, CompactInfo &compactInfo, bool &handled)
1024 {
1025 // Handle positioned children first.
1026 RenderObject *next = handlePositionedChild(child, marginInfo, handled);
1027 if (handled) {
1028 return next;
1029 }
1030
1031 // Handle floating children next.
1032 next = handleFloatingChild(child, marginInfo, handled);
1033 if (handled) {
1034 return next;
1035 }
1036
1037 // See if we have a compact element. If we do, then try to tuck the compact element into the margin space of the next block.
1038 next = handleCompactChild(child, compactInfo, marginInfo, handled);
1039 if (handled) {
1040 return next;
1041 }
1042
1043 // Finally, see if we have a run-in element.
1044 return handleRunInChild(child, handled);
1045 }
1046
handlePositionedChild(RenderObject * child,const MarginInfo & marginInfo,bool & handled)1047 RenderObject *RenderBlock::handlePositionedChild(RenderObject *child, const MarginInfo &marginInfo, bool &handled)
1048 {
1049 if (child->isPositioned()) {
1050 handled = true;
1051 if (!child->inPosObjectList()) {
1052 child->containingBlock()->insertPositionedObject(child);
1053 }
1054 adjustPositionedBlock(child, marginInfo);
1055 return child->nextSibling();
1056 }
1057 return nullptr;
1058 }
1059
handleFloatingChild(RenderObject * child,const MarginInfo & marginInfo,bool & handled)1060 RenderObject *RenderBlock::handleFloatingChild(RenderObject *child, const MarginInfo &marginInfo, bool &handled)
1061 {
1062 if (child->isFloating()) {
1063 handled = true;
1064 insertFloatingObject(child);
1065 adjustFloatingBlock(marginInfo);
1066 return child->nextSibling();
1067 }
1068 return nullptr;
1069 }
1070
isAnonymousWhitespace(RenderObject * o)1071 static inline bool isAnonymousWhitespace(RenderObject *o)
1072 {
1073 if (!o->isAnonymous()) {
1074 return false;
1075 }
1076 RenderObject *fc = o->firstChild();
1077 return fc && fc == o->lastChild() && fc->isText() && static_cast<RenderText *>(fc)->stringLength() == 1 &&
1078 static_cast<RenderText *>(fc)->text()[0].unicode() == ' ';
1079 }
1080
handleCompactChild(RenderObject * child,CompactInfo & compactInfo,const MarginInfo & marginInfo,bool & handled)1081 RenderObject *RenderBlock::handleCompactChild(RenderObject *child, CompactInfo &compactInfo, const MarginInfo &marginInfo, bool &handled)
1082 {
1083 if (!child->isCompact()) {
1084 return nullptr;
1085 }
1086 // FIXME: We only deal with one compact at a time. It is unclear what should be
1087 // done if multiple contiguous compacts are encountered. For now we assume that
1088 // compact A followed by another compact B should simply be treated as block A.
1089 if (!compactInfo.compact() && (child->childrenInline() || child->isReplaced())) {
1090 // Get the next non-positioned/non-floating RenderBlock.
1091 RenderObject *next = child->nextSibling();
1092 RenderObject *curr = next;
1093 while (curr && (curr->isFloatingOrPositioned() || isAnonymousWhitespace(curr) || curr->isAnonymousBlock())) {
1094 curr = curr->nextSibling();
1095 }
1096 if (curr && curr->isRenderBlock() && !curr->isCompact() && !curr->isRunIn()) {
1097 curr->calcWidth(); // So that horizontal margins are correct.
1098 // Need to compute margins for the child as though it is a block.
1099 child->style()->setDisplay(BLOCK);
1100 child->calcWidth();
1101 child->style()->setDisplay(COMPACT);
1102
1103 int childMargins = child->marginLeft() + child->marginRight();
1104 int margin = style()->direction() == LTR ? curr->marginLeft() : curr->marginRight();
1105 if (margin >= (childMargins + child->maxWidth())) {
1106 // The compact will fit in the margin.
1107 handled = true;
1108 compactInfo.set(child, curr);
1109 child->layoutIfNeeded();
1110 int off = marginInfo.margin();
1111 m_height += off + curr->marginTop() < child->marginTop() ?
1112 child->marginTop() - curr->marginTop() - off : 0;
1113
1114 child->setPos(0, 0); // This position will be updated to reflect the compact's
1115 // desired position and the line box for the compact will
1116 // pick that position up.
1117 return next;
1118 }
1119 }
1120 }
1121 child->style()->setDisplay(BLOCK);
1122 child->layoutIfNeeded();
1123 child->style()->setDisplay(COMPACT);
1124 return nullptr;
1125 }
1126
adjustSizeForCompactIfNeeded(RenderObject * child,CompactInfo & compactInfo)1127 void RenderBlock::adjustSizeForCompactIfNeeded(RenderObject *child, CompactInfo &compactInfo)
1128 {
1129 // if the compact is bigger than the block it was run into
1130 // then "this" block should take the height of the compact
1131 if (compactInfo.matches(child)) {
1132 // We have a compact child to squeeze in.
1133 RenderObject *compactChild = compactInfo.compact();
1134 if (compactChild->height() > child->height()) {
1135 m_height += compactChild->height() - child->height();
1136 }
1137 }
1138 }
1139
insertCompactIfNeeded(RenderObject * child,CompactInfo & compactInfo)1140 void RenderBlock::insertCompactIfNeeded(RenderObject *child, CompactInfo &compactInfo)
1141 {
1142 if (compactInfo.matches(child)) {
1143 // We have a compact child to squeeze in.
1144 RenderObject *compactChild = compactInfo.compact();
1145 int compactXPos = borderLeft() + paddingLeft() + compactChild->marginLeft();
1146 if (style()->direction() == RTL) {
1147 compactChild->calcWidth(); // have to do this because of the capped maxwidth
1148 compactXPos = width() - borderRight() - paddingRight() -
1149 compactChild->width() - compactChild->marginRight();
1150 }
1151
1152 int compactYPos = child->yPos() + child->borderTop() + child->paddingTop()
1153 - compactChild->paddingTop() - compactChild->borderTop();
1154 int adj = 0;
1155 KHTMLAssert(child->isRenderBlock());
1156 InlineRunBox *b = static_cast<RenderBlock *>(child)->firstLineBox();
1157 InlineRunBox *c = static_cast<RenderBlock *>(compactChild)->firstLineBox();
1158 if (b && c) {
1159 // adjust our vertical position
1160 int vpos = compactChild->getVerticalPosition(true, child);
1161 if (vpos == PositionBottom) {
1162 adj = b->height() > c->height() ? (b->height() + b->yPos() - c->height() - c->yPos()) : 0;
1163 } else if (vpos == PositionTop) {
1164 adj = b->yPos() - c->yPos();
1165 } else {
1166 adj = vpos;
1167 }
1168 compactYPos += adj;
1169 }
1170 Length newLineHeight(qMax(compactChild->lineHeight(true) + adj, (int)child->lineHeight(true)), khtml::Fixed);
1171 child->style()->setLineHeight(newLineHeight);
1172 child->setNeedsLayout(true, false);
1173 child->layout();
1174
1175 compactChild->setPos(compactXPos, compactYPos); // Set the x position.
1176 compactInfo.clear();
1177 }
1178 }
1179
handleRunInChild(RenderObject * child,bool & handled)1180 RenderObject *RenderBlock::handleRunInChild(RenderObject *child, bool &handled)
1181 {
1182 if (!child->isRunIn()) {
1183 return nullptr;
1184 }
1185 // See if we have a run-in element with inline children. If the
1186 // children aren't inline, then just treat the run-in as a normal
1187 // block.
1188 if (child->childrenInline() || child->isReplaced()) {
1189 // Get the next non-positioned/non-floating RenderBlock.
1190 RenderObject *curr = child->nextSibling();
1191 while (curr && (curr->isFloatingOrPositioned() || isAnonymousWhitespace(curr) || curr->isAnonymousBlock())) {
1192 curr = curr->nextSibling();
1193 }
1194 if (curr && (curr->isRenderBlock() && curr->childrenInline() && !curr->isCompact() && !curr->isRunIn())) {
1195 // The block acts like an inline, so just null out its
1196 // position.
1197 handled = true;
1198 child->setInline(true);
1199 child->setPos(0, 0);
1200
1201 // Remove the child.
1202 RenderObject *next = child->nextSibling();
1203 removeChildNode(child);
1204
1205 // Now insert the child under |curr|.
1206 curr->insertChildNode(child, curr->firstChild());
1207 return next;
1208 }
1209 }
1210 return nullptr;
1211 }
1212
collapseMargins(RenderObject * child,MarginInfo & marginInfo,int yPosEstimate)1213 int RenderBlock::collapseMargins(RenderObject *child, MarginInfo &marginInfo, int yPosEstimate)
1214 {
1215 Q_UNUSED(yPosEstimate);
1216 // Get our max pos and neg top margins.
1217 int posTop = child->maxTopMargin(true);
1218 int negTop = child->maxTopMargin(false);
1219
1220 // For self-collapsing blocks, collapse our bottom margins into our
1221 // top to get new posTop and negTop values.
1222 if (child->isSelfCollapsingBlock()) {
1223 posTop = qMax(posTop, (int)child->maxBottomMargin(true));
1224 negTop = qMax(negTop, (int)child->maxBottomMargin(false));
1225 }
1226
1227 // See if the top margin is quirky. We only care if this child has
1228 // margins that will collapse with us.
1229 bool topQuirk = child->isTopMarginQuirk() /*|| style()->marginTopCollapse() == MDISCARD*/;
1230
1231 if (marginInfo.canCollapseWithTop()) {
1232 // This child is collapsing with the top of the
1233 // block. If it has larger margin values, then we need to update
1234 // our own maximal values.
1235 if (!style()->htmlHacks() || !marginInfo.quirkContainer() || !topQuirk) {
1236 m_maxTopPosMargin = qMax(posTop, (int)m_maxTopPosMargin);
1237 m_maxTopNegMargin = qMax(negTop, (int)m_maxTopNegMargin);
1238 }
1239
1240 // The minute any of the margins involved isn't a quirk, don't
1241 // collapse it away, even if the margin is smaller (www.webreference.com
1242 // has an example of this, a <dt> with 0.8em author-specified inside
1243 // a <dl> inside a <td>.
1244 if (!marginInfo.determinedTopQuirk() && !topQuirk && (posTop - negTop)) {
1245 m_topMarginQuirk = false;
1246 marginInfo.setDeterminedTopQuirk(true);
1247 }
1248
1249 if (!marginInfo.determinedTopQuirk() && topQuirk && marginTop() == 0)
1250 // We have no top margin and our top child has a quirky margin.
1251 // We will pick up this quirky margin and pass it through.
1252 // This deals with the <td><div><p> case.
1253 // Don't do this for a block that split two inlines though. You do
1254 // still apply margins in this case.
1255 {
1256 m_topMarginQuirk = true;
1257 }
1258 }
1259
1260 if (marginInfo.quirkContainer() && marginInfo.atTopOfBlock() && (posTop - negTop)) {
1261 marginInfo.setTopQuirk(topQuirk);
1262 }
1263
1264 int ypos = m_height;
1265 if (child->isSelfCollapsingBlock()) {
1266 // This child has no height. We need to compute our
1267 // position before we collapse the child's margins together,
1268 // so that we can get an accurate position for the zero-height block.
1269 int collapsedTopPos = qMax(marginInfo.posMargin(), (int)child->maxTopMargin(true));
1270 int collapsedTopNeg = qMax(marginInfo.negMargin(), (int)child->maxTopMargin(false));
1271 marginInfo.setMargin(collapsedTopPos, collapsedTopNeg);
1272
1273 // Now collapse the child's margins together, which means examining our
1274 // bottom margin values as well.
1275 marginInfo.setPosMarginIfLarger(child->maxBottomMargin(true));
1276 marginInfo.setNegMarginIfLarger(child->maxBottomMargin(false));
1277
1278 if (!marginInfo.canCollapseWithTop())
1279 // We need to make sure that the position of the self-collapsing block
1280 // is correct, since it could have overflowing content
1281 // that needs to be positioned correctly (e.g., a block that
1282 // had a specified height of 0 but that actually had subcontent).
1283 {
1284 ypos = m_height + collapsedTopPos - collapsedTopNeg;
1285 }
1286 } else {
1287 #ifdef APPLE_CHANGES
1288 if (child->style()->marginTopCollapse() == MSEPARATE) {
1289 m_height += marginInfo.margin() + child->marginTop();
1290 ypos = m_height;
1291 } else
1292 #endif
1293 if (!marginInfo.atTopOfBlock() ||
1294 (!marginInfo.canCollapseTopWithChildren()
1295 && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.topQuirk()))) {
1296 // We're collapsing with a previous sibling's margins and not
1297 // with the top of the block.
1298 m_height += qMax(marginInfo.posMargin(), posTop) - qMax(marginInfo.negMargin(), negTop);
1299 ypos = m_height;
1300 }
1301
1302 marginInfo.setPosMargin(child->maxBottomMargin(true));
1303 marginInfo.setNegMargin(child->maxBottomMargin(false));
1304
1305 if (marginInfo.margin()) {
1306 marginInfo.setBottomQuirk(child->isBottomMarginQuirk() /*|| style()->marginBottomCollapse() == MDISCARD*/);
1307 }
1308
1309 marginInfo.setSelfCollapsingBlockClearedFloat(false);
1310 }
1311 return ypos;
1312 }
1313
clearFloatsIfNeeded(RenderObject * child,MarginInfo & marginInfo,int oldTopPosMargin,int oldTopNegMargin,int yPos)1314 int RenderBlock::clearFloatsIfNeeded(RenderObject *child, MarginInfo &marginInfo, int oldTopPosMargin, int oldTopNegMargin, int yPos)
1315 {
1316 int heightIncrease = getClearDelta(child, yPos);
1317 if (heightIncrease) {
1318
1319 // Increase our height by the amount we had to clear.
1320 bool selfCollapsing = child->isSelfCollapsingBlock();
1321 if (!selfCollapsing) {
1322 m_height += heightIncrease;
1323 } else {
1324 // For self-collapsing blocks that clear, they may end up collapsing
1325 // into the bottom of the parent block. We simulate this behavior by
1326 // setting our positive margin value to compensate for the clear.
1327 marginInfo.setPosMargin(qMax(0, child->yPos() - m_height));
1328 marginInfo.setNegMargin(0);
1329 marginInfo.setSelfCollapsingBlockClearedFloat(true);
1330 }
1331
1332 if (marginInfo.canCollapseWithTop()) {
1333 // We can no longer collapse with the top of the block since a clear
1334 // occurred. The empty blocks collapse into the cleared block.
1335 // FIXME: This isn't quite correct. Need clarification for what to do
1336 // if the height the cleared block is offset by is smaller than the
1337 // margins involved.
1338 m_maxTopPosMargin = oldTopPosMargin;
1339 m_maxTopNegMargin = oldTopNegMargin;
1340 marginInfo.setAtTopOfBlock(false);
1341 }
1342 /*
1343 // If our value of clear caused us to be repositioned vertically to be
1344 // underneath a float, we might have to do another layout to take into account
1345 // the extra space we now have available.
1346 if (!selfCollapsing && !child->style()->width().isFixed() && child->usesLineWidth())
1347 // The child's width is a percentage of the line width.
1348 // When the child shifts to clear an item, its width can
1349 // change (because it has more available line width).
1350 // So go ahead and mark the item as dirty.
1351 child->setChildNeedsLayout(true);
1352 if (!child->flowAroundFloats() && child->hasFloats())
1353 child->markAllDescendantsWithFloatsForLayout();
1354 child->layoutIfNeeded();
1355 */
1356 return yPos + heightIncrease;
1357 }
1358 return yPos;
1359 }
1360
canClear(RenderObject * child,PageBreakLevel level)1361 bool RenderBlock::canClear(RenderObject *child, PageBreakLevel level)
1362 {
1363 KHTMLAssert(child->parent() && child->parent() == this);
1364 KHTMLAssert(canvas()->pagedMode());
1365
1366 // Positioned elements cannot be moved. Only normal flow and floating.
1367 if (child->isPositioned() || child->isRelPositioned()) {
1368 return false;
1369 }
1370
1371 switch (level) {
1372 case PageBreakNormal:
1373 // check page-break-inside: avoid
1374 if (!style()->pageBreakInside())
1375 // we cannot, but can our parent?
1376 if (!parent()->canClear(this, level)) {
1377 return false;
1378 }
1379 case PageBreakHarder:
1380 // check page-break-after/before: avoid
1381 if (m_avoidPageBreak)
1382 // we cannot, but can our parent?
1383 if (!parent()->canClear(this, level)) {
1384 return false;
1385 }
1386 case PageBreakForced:
1387 // child is larger than page-height and is forced to break
1388 if (child->height() > canvas()->pageHeight()) {
1389 return false;
1390 }
1391 return true;
1392 }
1393 assert(false);
1394 return false;
1395 }
1396
clearPageBreak(RenderObject * child,int pageBottom)1397 void RenderBlock::clearPageBreak(RenderObject *child, int pageBottom)
1398 {
1399 KHTMLAssert(child->parent() && child->parent() == this);
1400 KHTMLAssert(canvas()->pagedMode());
1401
1402 if (child->yPos() >= pageBottom) {
1403 return;
1404 }
1405
1406 int heightIncrease = 0;
1407
1408 heightIncrease = pageBottom - child->yPos();
1409
1410 // ### should never happen, canClear should have been called to detect it.
1411 if (child->height() > canvas()->pageHeight()) {
1412 // qCDebug(KHTML_LOG) << "### child is too large to clear: " << child->height() << " > " << canvas()->pageHeight();
1413 return;
1414 }
1415
1416 // The child needs to be lowered. Move the child so that it just clears the break.
1417 child->setPos(child->xPos(), pageBottom);
1418
1419 #ifdef PAGE_DEBUG
1420 qCDebug(KHTML_LOG) << "Cleared block " << heightIncrease << "px";
1421 #endif
1422
1423 // Increase our height by the amount we had to clear.
1424 m_height += heightIncrease;
1425
1426 // We might have to do another layout to take into account
1427 // the extra space we now have available.
1428 if (!child->style()->width().isFixed() && child->usesLineWidth())
1429 // The child's width is a percentage of the line width.
1430 // When the child shifts to clear a page-break, its width can
1431 // change (because it has more available line width).
1432 // So go ahead and mark the item as dirty.
1433 {
1434 child->setChildNeedsLayout(true);
1435 }
1436 if (!child->flowAroundFloats() && child->hasFloats()) {
1437 child->markAllDescendantsWithFloatsForLayout();
1438 }
1439 if (child->containsPageBreak()) {
1440 child->setNeedsLayout(true);
1441 }
1442 child->layoutIfNeeded();
1443
1444 child->setAfterPageBreak(true);
1445 }
1446
estimateVerticalPosition(RenderObject * child,const MarginInfo & marginInfo)1447 int RenderBlock::estimateVerticalPosition(RenderObject *child, const MarginInfo &marginInfo)
1448 {
1449 // FIXME: We need to eliminate the estimation of vertical position, because
1450 // when it's wrong we sometimes trigger a pathological relayout if there are
1451 // intruding floats.
1452 int yPosEstimate = m_height;
1453 if (!marginInfo.canCollapseWithTop()) {
1454 int childMarginTop = child->selfNeedsLayout() ? child->marginTop() : child->collapsedMarginTop();
1455 yPosEstimate += qMax(marginInfo.margin(), childMarginTop);
1456 }
1457 yPosEstimate += getClearDelta(child, yPosEstimate);
1458 return yPosEstimate;
1459 }
1460
determineHorizontalPosition(RenderObject * child)1461 void RenderBlock::determineHorizontalPosition(RenderObject *child)
1462 {
1463 if (style()->direction() == LTR) {
1464 int xPos = borderLeft() + paddingLeft();
1465
1466 if (m_layer && scrollsOverflowY() && m_layer->hasReversedScrollbar()) {
1467 xPos += m_layer->verticalScrollbarWidth();
1468 }
1469
1470 // Add in our left margin.
1471 int chPos = xPos + child->marginLeft();
1472
1473 // Some objects (e.g., tables, horizontal rules, overflow:auto blocks) avoid floats. They need
1474 // to shift over as necessary to dodge any floats that might get in the way.
1475 if (child->flowAroundFloats()) {
1476 int leftOff = leftOffset(m_height);
1477 if (style()->textAlign() != KHTML_CENTER && !child->style()->marginLeft().isAuto()) {
1478 if (child->marginLeft() < 0) {
1479 leftOff += child->marginLeft();
1480 }
1481 chPos = qMax(chPos, leftOff); // Let the float sit in the child's margin if it can fit.
1482 } else if (leftOff != xPos) {
1483 // The object is shifting right. The object might be centered, so we need to
1484 // recalculate our horizontal margins. Note that the containing block content
1485 // width computation will take into account the delta between |leftOff| and |xPos|
1486 // so that we can just pass the content width in directly to the |calcHorizontalMargins|
1487 // function.
1488 static_cast<RenderBox *>(child)->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->yPos()));
1489 chPos = leftOff + child->marginLeft();
1490 }
1491 }
1492
1493 child->setPos(chPos, child->yPos());
1494 } else {
1495 int xPos = m_width - borderRight() - paddingRight();
1496 if (m_layer && scrollsOverflowY() && !m_layer->hasReversedScrollbar()) {
1497 xPos -= m_layer->verticalScrollbarWidth();
1498 }
1499 int chPos = xPos - (child->width() + child->marginRight());
1500 if (child->flowAroundFloats()) {
1501 int rightOff = rightOffset(m_height);
1502 if (style()->textAlign() != KHTML_CENTER && !child->style()->marginRight().isAuto()) {
1503 if (child->marginRight() < 0) {
1504 rightOff -= child->marginRight();
1505 }
1506 chPos = qMin(chPos, rightOff - child->width()); // Let the float sit in the child's margin if it can fit.
1507 } else if (rightOff != xPos) {
1508 // The object is shifting left. The object might be centered, so we need to
1509 // recalculate our horizontal margins. Note that the containing block content
1510 // width computation will take into account the delta between |rightOff| and |xPos|
1511 // so that we can just pass the content width in directly to the |calcHorizontalMargins|
1512 // function.
1513 static_cast<RenderBox *>(child)->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->yPos()));
1514 chPos = rightOff - child->marginRight() - child->width();
1515 }
1516 }
1517 child->setPos(chPos, child->yPos());
1518 }
1519 }
1520
setCollapsedBottomMargin(const MarginInfo & marginInfo)1521 void RenderBlock::setCollapsedBottomMargin(const MarginInfo &marginInfo)
1522 {
1523 if (marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()) {
1524 // Update our max pos/neg bottom margins, since we collapsed our bottom margins
1525 // with our children.
1526 m_maxBottomPosMargin = qMax((int)m_maxBottomPosMargin, marginInfo.posMargin());
1527 m_maxBottomNegMargin = qMax((int)m_maxBottomNegMargin, marginInfo.negMargin());
1528
1529 if (!marginInfo.bottomQuirk()) {
1530 m_bottomMarginQuirk = false;
1531 }
1532
1533 if (marginInfo.bottomQuirk() && marginBottom() == 0)
1534 // We have no bottom margin and our last child has a quirky margin.
1535 // We will pick up this quirky margin and pass it through.
1536 // This deals with the <td><div><p> case.
1537 {
1538 m_bottomMarginQuirk = true;
1539 }
1540 }
1541 }
1542
handleBottomOfBlock(int top,int bottom,MarginInfo & marginInfo)1543 void RenderBlock::handleBottomOfBlock(int top, int bottom, MarginInfo &marginInfo)
1544 {
1545 // If our last flow was a self-collapsing block that cleared a float, then we don't
1546 // collapse it with the bottom of the block.
1547 if (!marginInfo.selfCollapsingBlockClearedFloat()) {
1548 marginInfo.setAtBottomOfBlock(true);
1549 }
1550
1551 // If we can't collapse with children then go ahead and add in the bottom margin.
1552 if (!marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()
1553 && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.bottomQuirk())) {
1554 m_height += marginInfo.margin();
1555 }
1556
1557 // Now add in our bottom border/padding.
1558 m_height += bottom;
1559
1560 // Negative margins can cause our height to shrink below our minimal height (border/padding).
1561 // If this happens, ensure that the computed height is increased to the minimal height.
1562 m_height = qMax(m_height, top + bottom);
1563
1564 // Always make sure our overflow height is at least our height.
1565 m_overflowHeight = qMax(m_height, m_overflowHeight);
1566
1567 // Update our bottom collapsed margin info.
1568 setCollapsedBottomMargin(marginInfo);
1569 }
1570
layoutBlockChildren(bool relayoutChildren)1571 void RenderBlock::layoutBlockChildren(bool relayoutChildren)
1572 {
1573 #ifdef DEBUG_LAYOUT
1574 qCDebug(KHTML_LOG) << renderName() << " layoutBlockChildren( " << this << " ), relayoutChildren=" << relayoutChildren;
1575 #endif
1576
1577 int top = borderTop() + paddingTop();
1578 int bottom = borderBottom() + paddingBottom();
1579 if (m_layer && scrollsOverflowX() && style()->height().isAuto()) {
1580 bottom += m_layer->horizontalScrollbarHeight();
1581 }
1582
1583 m_height = m_overflowHeight = top;
1584
1585 // The margin struct caches all our current margin collapsing state.
1586 // The compact struct caches state when we encounter compacts.
1587 MarginInfo marginInfo(this, top, bottom);
1588 CompactInfo compactInfo;
1589
1590 // Fieldsets need to find their legend and position it inside the border of the object.
1591 // The legend then gets skipped during normal layout.
1592 RenderObject *legend = layoutLegend(relayoutChildren);
1593
1594 PageBreakInfo pageBreakInfo(pageTopAfter(0));
1595
1596 int previousFloatBottom = 0;
1597 RenderObject *child = firstChild();
1598 while (child != nullptr) {
1599 if (legend == child) {
1600 child = child->nextSibling();
1601 continue; // Skip the legend, since it has already been positioned up in the fieldset's border.
1602 }
1603
1604 int oldTopPosMargin = m_maxTopPosMargin;
1605 int oldTopNegMargin = m_maxTopNegMargin;
1606
1607 // make sure we relayout children if we need it.
1608 if ((!child->isPositioned() || child->isPosWithStaticDim()) && (relayoutChildren ||
1609 (child->isReplaced() && (child->style()->width().isPercent() || child->style()->height().isPercent())) ||
1610 (child->isRenderBlock() && child->style()->height().isPercent()) ||
1611 (child->isBody() && child->style()->htmlHacks()))) {
1612 child->setChildNeedsLayout(true);
1613 }
1614
1615 // Handle the four types of special elements first. These include positioned content, floating content, compacts and
1616 // run-ins. When we encounter these four types of objects, we don't actually lay them out as normal flow blocks.
1617 bool handled = false;
1618 RenderObject *next = handleSpecialChild(child, marginInfo, compactInfo, handled);
1619 if (handled) {
1620 child = next;
1621 continue;
1622 }
1623
1624 // The child is a normal flow object. Compute its vertical margins now.
1625 child->calcVerticalMargins();
1626
1627 #ifdef APPLE_CHANGES /* margin-*-collapse not merged yet */
1628 // Do not allow a collapse if the margin top collapse style is set to SEPARATE.
1629 if (child->style()->marginTopCollapse() == MSEPARATE) {
1630 marginInfo.setAtTopOfBlock(false);
1631 marginInfo.clearMargin();
1632 }
1633 #endif
1634
1635 // Try to guess our correct y position. In most cases this guess will
1636 // be correct. Only if we're wrong (when we compute the real y position)
1637 // will we have to potentially relayout.
1638 int yPosEstimate = estimateVerticalPosition(child, marginInfo);
1639 bool markDescendantsWithFloats = false;
1640 if (yPosEstimate != child->yPos() && !child->flowAroundFloats() && child->hasFloats()) {
1641 markDescendantsWithFloats = true;
1642 } else if (!child->flowAroundFloats() || child->usesLineWidth()) {
1643 // If an element might be affected by the presence of floats, then always mark it for
1644 // layout.
1645 int fb = qMax(previousFloatBottom, floatBottom());
1646 if (fb > yPosEstimate) {
1647 markDescendantsWithFloats = true;
1648 }
1649 }
1650
1651 if (child->isRenderBlock()) {
1652 if (markDescendantsWithFloats) {
1653 child->markAllDescendantsWithFloatsForLayout();
1654 }
1655 previousFloatBottom = qMax(previousFloatBottom, child->yPos() + static_cast<RenderBlock *>(child)->floatBottom());
1656 }
1657
1658 // Go ahead and position the child as though it didn't collapse with the top.
1659 child->setPos(child->xPos(), yPosEstimate);
1660 child->layoutIfNeeded();
1661
1662 // Now determine the correct ypos based on examination of collapsing margin
1663 // values.
1664 int yBeforeClear = collapseMargins(child, marginInfo, yPosEstimate);
1665
1666 // Now check for clear.
1667 int yAfterClear = clearFloatsIfNeeded(child, marginInfo, oldTopPosMargin, oldTopNegMargin, yBeforeClear);
1668
1669 child->setPos(child->xPos(), yAfterClear);
1670
1671 // Now we have a final y position. See if it really does end up being different from our estimate.
1672 if (yAfterClear != yPosEstimate) {
1673 if (child->usesLineWidth()) {
1674 // The child's width depends on the line width.
1675 // When the child shifts to clear an item, its width can
1676 // change (because it has more available line width).
1677 // So go ahead and mark the item as dirty.
1678 child->setChildNeedsLayout(true, false);
1679 }
1680
1681 if (!child->flowAroundFloats() && child->hasFloats()) {
1682 child->markAllDescendantsWithFloatsForLayout();
1683 }
1684
1685 // Our guess was wrong. Make the child lay itself out again.
1686 child->layoutIfNeeded();
1687 }
1688
1689 // We are no longer at the top of the block if we encounter a non-empty child.
1690 // This has to be done after checking for clear, so that margins can be reset if a clear occurred.
1691 if (marginInfo.atTopOfBlock() && !child->isSelfCollapsingBlock()) {
1692 marginInfo.setAtTopOfBlock(false);
1693 }
1694
1695 // Now place the child in the correct horizontal position
1696 determineHorizontalPosition(child);
1697
1698 adjustSizeForCompactIfNeeded(child, compactInfo);
1699 // Update our height now that the child has been placed in the correct position.
1700 m_height += child->height();
1701
1702 #ifdef APPLE_CHANGES
1703 if (child->style()->marginBottomCollapse() == MSEPARATE) {
1704 m_height += child->marginBottom();
1705 marginInfo.clearMargin();
1706 }
1707 #endif
1708
1709 // Check for page-breaks
1710 if (canvas()->pagedMode()) {
1711 clearChildOfPageBreaks(child, pageBreakInfo, marginInfo);
1712 }
1713
1714 if (child->hasOverhangingFloats() && !child->flowAroundFloats()) {
1715 // need to add the child's floats to our floating objects list, but not in the case where
1716 // overflow is auto/scroll
1717 addOverHangingFloats(static_cast<RenderBlock *>(child), -child->xPos(), -child->yPos(), true);
1718 }
1719
1720 // See if this child has made our overflow need to grow.
1721 int effX = child->effectiveXPos();
1722 int effY = child->effectiveYPos();
1723 m_overflowWidth = qMax(effX + child->effectiveWidth(), m_overflowWidth);
1724 m_overflowLeft = qMin(effX, m_overflowLeft);
1725 m_overflowHeight = qMax(effY + child->effectiveHeight(), m_overflowHeight);
1726 m_overflowTop = qMin(effY, m_overflowTop);
1727
1728 // Insert our compact into the block margin if we have one.
1729 insertCompactIfNeeded(child, compactInfo);
1730
1731 child = child->nextSibling();
1732 }
1733
1734 // The last child had forced page-break-after
1735 if (pageBreakInfo.forcePageBreak()) {
1736 m_height = pageBreakInfo.pageBottom();
1737 }
1738
1739 // Now do the handling of the bottom of the block, adding in our bottom border/padding and
1740 // determining the correct collapsed bottom margin information.
1741 handleBottomOfBlock(top, bottom, marginInfo);
1742
1743 setNeedsLayout(false);
1744 }
1745
clearChildOfPageBreaks(RenderObject * child,PageBreakInfo & pageBreakInfo,MarginInfo & marginInfo)1746 void RenderBlock::clearChildOfPageBreaks(RenderObject *child, PageBreakInfo &pageBreakInfo, MarginInfo &marginInfo)
1747 {
1748 (void)marginInfo;
1749 int childTop = child->yPos();
1750 int childBottom = child->yPos() + child->height();
1751 #ifdef PAGE_DEBUG
1752 qCDebug(KHTML_LOG) << renderName() << " ChildTop: " << childTop << " ChildBottom: " << childBottom;
1753 #endif
1754
1755 bool forcePageBreak = pageBreakInfo.forcePageBreak() || child->style()->pageBreakBefore() == PBALWAYS;
1756 #ifdef PAGE_DEBUG
1757 if (forcePageBreak) {
1758 qCDebug(KHTML_LOG) << renderName() << "Forced break required";
1759 }
1760 #endif
1761
1762 int xpage = crossesPageBreak(childTop, childBottom);
1763 if (xpage || forcePageBreak) {
1764 if (!forcePageBreak && child->containsPageBreak() && !child->needsPageClear()) {
1765 #ifdef PAGE_DEBUG
1766 qCDebug(KHTML_LOG) << renderName() << " Child contains page-break to page " << xpage;
1767 #endif
1768 // ### Actually this assumes floating children are breaking/clearing
1769 // nicely as well.
1770 setContainsPageBreak(true);
1771 } else {
1772 bool doBreak = true;
1773 // don't break before the first child or when page-break-inside is avoid
1774 if (!forcePageBreak && (!style()->pageBreakInside() || m_avoidPageBreak || child == firstChild())) {
1775 if (parent() && parent()->canClear(this, (m_avoidPageBreak) ? PageBreakHarder : PageBreakNormal)) {
1776 #ifdef PAGE_DEBUG
1777 qCDebug(KHTML_LOG) << renderName() << "Avoid page-break inside";
1778 #endif
1779 child->setNeedsPageClear(false);
1780 setNeedsPageClear(true);
1781 doBreak = false;
1782 }
1783 #ifdef PAGE_DEBUG
1784 else {
1785 qCDebug(KHTML_LOG) << renderName() << "Ignoring page-break avoid";
1786 }
1787 #endif
1788 }
1789 if (doBreak) {
1790 #ifdef PAGE_DEBUG
1791 qCDebug(KHTML_LOG) << renderName() << " Clearing child of page-break";
1792 qCDebug(KHTML_LOG) << renderName() << " child top of page " << xpage;
1793 #endif
1794 clearPageBreak(child, pageBreakInfo.pageBottom());
1795 child->setNeedsPageClear(false);
1796 setContainsPageBreak(true);
1797 }
1798 }
1799 pageBreakInfo.setPageBottom(pageBreakInfo.pageBottom() + canvas()->pageHeight());
1800 } else if (child->yPos() >= pageBreakInfo.pageBottom()) {
1801 bool doBreak = true;
1802 #ifdef PAGE_DEBUG
1803 qCDebug(KHTML_LOG) << "Page-break between children";
1804 #endif
1805 if (!style()->pageBreakInside() || m_avoidPageBreak) {
1806 if (parent() && parent()->canClear(this, (m_avoidPageBreak) ? PageBreakHarder : PageBreakNormal)) {
1807 #ifdef PAGE_DEBUG
1808 qCDebug(KHTML_LOG) << "Avoid page-break inside";
1809 #endif
1810 child->setNeedsPageClear(false);
1811 setNeedsPageClear(true);
1812 doBreak = false;
1813 }
1814 #ifdef PAGE_DEBUG
1815 else {
1816 qCDebug(KHTML_LOG) << "Ignoring page-break avoid";
1817 }
1818 #endif
1819 }
1820 if (doBreak) {
1821 // Break between children
1822 setContainsPageBreak(true);
1823 // ### Should collapse top-margin with page-margin
1824 }
1825 pageBreakInfo.setPageBottom(pageBreakInfo.pageBottom() + canvas()->pageHeight());
1826 }
1827
1828 // Do we need a forced page-break before next child?
1829 pageBreakInfo.setForcePageBreak(false);
1830 if (child->style()->pageBreakAfter() == PBALWAYS) {
1831 pageBreakInfo.setForcePageBreak(true);
1832 }
1833 }
1834
layoutPositionedObjects(bool relayoutChildren)1835 void RenderBlock::layoutPositionedObjects(bool relayoutChildren)
1836 {
1837 if (m_positionedObjects) {
1838 for (int i = 0; i < m_positionedObjects->size(); i++) { // size() can grow during loop
1839 RenderObject *const r = m_positionedObjects->at(i);
1840 if (r->markedForRepaint()) {
1841 r->repaintDuringLayout();
1842 r->setMarkedForRepaint(false);
1843 }
1844 if (relayoutChildren || (r->isPosWithStaticDim() && r->parent() != this && r->parent()->isBlockFlow())) {
1845 r->setChildNeedsLayout(true, false);
1846 r->dirtyFormattingContext(false);
1847 }
1848 r->layoutIfNeeded();
1849 }
1850 }
1851 }
1852
paint(PaintInfo & pI,int _tx,int _ty)1853 void RenderBlock::paint(PaintInfo &pI, int _tx, int _ty)
1854 {
1855 _tx += m_x;
1856 _ty += m_y;
1857
1858 // check if we need to do anything at all...
1859 if (!isRoot() && !isInlineFlow() && !isRelPositioned() && !isPositioned()) {
1860 int h = m_overflowHeight;
1861 int yPos = _ty;
1862 if (m_floatingObjects && floatBottom() > h) {
1863 h = floatBottom();
1864 }
1865
1866 yPos += overflowTop();
1867
1868 int os = maximalOutlineSize(pI.phase);
1869 if ((yPos > pI.r.bottom() + os) || (_ty + h <= pI.r.y() - os)) {
1870 return;
1871 }
1872 }
1873
1874 paintObject(pI, _tx, _ty);
1875 }
1876
paintObject(PaintInfo & pI,int _tx,int _ty,bool shouldPaintOutline)1877 void RenderBlock::paintObject(PaintInfo &pI, int _tx, int _ty, bool shouldPaintOutline)
1878 {
1879 #ifdef DEBUG_LAYOUT
1880 qCDebug(KHTML_LOG) << renderName() << "(RenderBlock) " << this << " ::paintObject() w/h = (" << width() << "/" << height() << ")";
1881 #endif
1882
1883 // If we're a repositioned run-in, don't paint background/borders.
1884 bool inlineFlow = isInlineFlow();
1885
1886 // 1. paint background, borders etc
1887 if (!inlineFlow &&
1888 (pI.phase == PaintActionElementBackground || pI.phase == PaintActionChildBackground) &&
1889 shouldPaintBackgroundOrBorder() && style()->visibility() == VISIBLE) {
1890 paintBoxDecorations(pI, _tx, _ty);
1891 }
1892
1893 if (pI.phase == PaintActionElementBackground) {
1894 return;
1895 }
1896 if (pI.phase == PaintActionChildBackgrounds) {
1897 pI.phase = PaintActionChildBackground;
1898 }
1899
1900 // 2. paint contents
1901 int scrolledX = _tx;
1902 int scrolledY = _ty;
1903 if (hasOverflowClip() && m_layer) {
1904 m_layer->subtractScrollOffset(scrolledX, scrolledY);
1905 }
1906
1907 if (childrenInline()) {
1908 paintLines(pI, scrolledX, scrolledY);
1909 } else {
1910 for (RenderObject *child = firstChild(); child; child = child->nextSibling())
1911 if (!child->layer() && !child->isFloating()) {
1912 child->paint(pI, scrolledX, scrolledY);
1913 }
1914 }
1915
1916 // 3. paint floats.
1917 if (!inlineFlow && (pI.phase == PaintActionFloat || pI.phase == PaintActionSelection)) {
1918 paintFloats(pI, scrolledX, scrolledY, pI.phase == PaintActionSelection);
1919 }
1920
1921 // 4. paint outline.
1922 if (shouldPaintOutline && !inlineFlow && pI.phase == PaintActionOutline &&
1923 style()->outlineWidth() && style()->visibility() == VISIBLE) {
1924 paintOutline(pI.p, _tx, _ty, width(), height(), style());
1925 }
1926
1927 // 5. paint caret.
1928 /*
1929 If the caret's node's render object's containing block is this block,
1930 and the paint action is PaintActionForeground,
1931 then paint the caret.
1932 */
1933 if ((!canvas()->hasSelection() && pI.phase == PaintActionForeground)
1934 || pI.phase == PaintActionSelection) {
1935 KHTMLPart *part = document()->part();
1936 const Selection &s = part->caret();
1937 NodeImpl *baseNode = s.extent().node();
1938 RenderObject *renderer = baseNode ? baseNode->renderer() : nullptr;
1939 if (renderer && renderer->containingBlock() == this && (part->isCaretMode() || baseNode->isContentEditable())) {
1940 part->paintCaret(pI.p, pI.r);
1941 part->paintDragCaret(pI.p, pI.r);
1942 }
1943 }
1944
1945 #ifdef BOX_DEBUG
1946 if (style() && style()->visibility() == VISIBLE) {
1947 if (isAnonymous()) {
1948 outlineBox(pI.p, _tx, _ty, "green");
1949 }
1950 if (isFloating()) {
1951 outlineBox(pI.p, _tx, _ty, "yellow");
1952 } else {
1953 outlineBox(pI.p, _tx, _ty);
1954 }
1955 }
1956 #endif
1957 }
1958
visibleFloatingRegion(int x,int y) const1959 QRegion RenderBlock::visibleFloatingRegion(int x, int y) const
1960 {
1961 if (!m_floatingObjects) {
1962 return QRegion();
1963 }
1964 FloatingObject *fo;
1965 QRegion r;
1966 QListIterator<FloatingObject *> it(*m_floatingObjects);
1967 while (it.hasNext()) {
1968 fo = it.next();
1969 if (!fo->noPaint && !fo->node->layer() && fo->node->style()->visibility() == VISIBLE) {
1970 const RenderStyle *s = fo->node->style();
1971 int ow = s->outlineSize();
1972 if (s->backgroundImage() || s->backgroundColor().isValid() || s->hasBorder() || fo->node->isReplaced() || ow) {
1973 r += QRect(x - ow + fo->left + fo->node->marginLeft(),
1974 y - ow + fo->startY + fo->node->marginTop(),
1975 fo->width + ow * 2 - fo->node->marginLeft() - fo->node->marginRight(),
1976 fo->endY - fo->startY + ow * 2 - fo->node->marginTop() - fo->node->marginBottom());
1977 } else {
1978 r += fo->node->visibleFlowRegion(x + fo->left + fo->node->marginLeft(), y + fo->startY + fo->node->marginTop());
1979 }
1980 }
1981 }
1982 return r;
1983 }
1984
paintFloats(PaintInfo & pI,int _tx,int _ty,bool paintSelection)1985 void RenderBlock::paintFloats(PaintInfo &pI, int _tx, int _ty, bool paintSelection)
1986 {
1987 if (!m_floatingObjects) {
1988 return;
1989 }
1990
1991 FloatingObject *r;
1992 QListIterator<FloatingObject *> it(*m_floatingObjects);
1993 while (it.hasNext()) {
1994 r = it.next();
1995 // Only paint the object if our noPaint flag isn't set.
1996 if (r->node->isFloating() && !r->noPaint && !r->node->layer()) {
1997 PaintAction oldphase = pI.phase;
1998 if (paintSelection) {
1999 pI.phase = PaintActionSelection;
2000 r->node->paint(pI, _tx + r->left - r->node->xPos() + r->node->marginLeft(),
2001 _ty + r->startY - r->node->yPos() + r->node->marginTop());
2002 } else {
2003 pI.phase = PaintActionElementBackground;
2004 r->node->paint(pI,
2005 _tx + r->left - r->node->xPos() + r->node->marginLeft(),
2006 _ty + r->startY - r->node->yPos() + r->node->marginTop());
2007 pI.phase = PaintActionChildBackgrounds;
2008 r->node->paint(pI,
2009 _tx + r->left - r->node->xPos() + r->node->marginLeft(),
2010 _ty + r->startY - r->node->yPos() + r->node->marginTop());
2011 pI.phase = PaintActionFloat;
2012 r->node->paint(pI,
2013 _tx + r->left - r->node->xPos() + r->node->marginLeft(),
2014 _ty + r->startY - r->node->yPos() + r->node->marginTop());
2015 pI.phase = PaintActionForeground;
2016 r->node->paint(pI,
2017 _tx + r->left - r->node->xPos() + r->node->marginLeft(),
2018 _ty + r->startY - r->node->yPos() + r->node->marginTop());
2019 pI.phase = PaintActionOutline;
2020 r->node->paint(pI,
2021 _tx + r->left - r->node->xPos() + r->node->marginLeft(),
2022 _ty + r->startY - r->node->yPos() + r->node->marginTop());
2023 }
2024 pI.phase = oldphase;
2025 }
2026 }
2027 }
2028
insertPositionedObject(RenderObject * o)2029 void RenderBlock::insertPositionedObject(RenderObject *o)
2030 {
2031 // Create the list of special objects if we don't aleady have one
2032 if (!m_positionedObjects) {
2033 m_positionedObjects = new QList<RenderObject *>;
2034 }
2035
2036 // Create the special object entry & append it to the list
2037 m_positionedObjects->append(o);
2038 o->setInPosObjectList();
2039 }
2040
removePositionedObject(RenderObject * o)2041 void RenderBlock::removePositionedObject(RenderObject *o)
2042 {
2043 if (m_positionedObjects) {
2044 m_positionedObjects->removeAll(o);
2045 if (m_positionedObjects->isEmpty()) {
2046 delete m_positionedObjects;
2047 m_positionedObjects = nullptr;
2048 }
2049 }
2050 o->setInPosObjectList(false);
2051 }
2052
insertFloatingObject(RenderObject * o)2053 void RenderBlock::insertFloatingObject(RenderObject *o)
2054 {
2055 // Create the list of special objects if we don't aleady have one
2056 if (!m_floatingObjects) {
2057 m_floatingObjects = new QList<FloatingObject *>;
2058 } else {
2059 // Don't insert the object again if it's already in the list
2060 QListIterator<FloatingObject *> it(*m_floatingObjects);
2061 FloatingObject *f;
2062 while (it.hasNext()) {
2063 f = it.next();
2064 if (f->node == o) {
2065 return;
2066 }
2067 }
2068 }
2069
2070 // Create the special object entry & append it to the list
2071
2072 FloatingObject *newObj;
2073 if (o->isFloating()) {
2074 // floating object
2075 o->layoutIfNeeded();
2076
2077 if (o->style()->floating() & FLEFT) {
2078 newObj = new FloatingObject(FloatingObject::FloatLeft);
2079 } else {
2080 newObj = new FloatingObject(FloatingObject::FloatRight);
2081 }
2082
2083 newObj->startY = -500000;
2084 newObj->endY = -500000;
2085 newObj->width = o->width() + o->marginLeft() + o->marginRight();
2086 } else {
2087 // We should never get here, as insertFloatingObject() should only ever be called with floating
2088 // objects.
2089 KHTMLAssert(false);
2090 newObj = nullptr; // keep gcc's uninitialized variable warnings happy
2091 }
2092
2093 newObj->node = o;
2094
2095 m_floatingObjects->append(newObj);
2096 }
2097
removeFloatingObject(RenderObject * o)2098 void RenderBlock::removeFloatingObject(RenderObject *o)
2099 {
2100 if (m_floatingObjects) {
2101 QMutableListIterator<FloatingObject *> it(*m_floatingObjects);
2102 while (it.hasNext()) {
2103 if (it.next()->node == o) {
2104 delete it.peekPrevious();
2105 it.remove();
2106 }
2107 }
2108 }
2109 }
2110
positionNewFloats()2111 void RenderBlock::positionNewFloats()
2112 {
2113 if (!m_floatingObjects) {
2114 return;
2115 }
2116 QListIterator<FloatingObject *> it(*m_floatingObjects);
2117 it.toBack();
2118 if (!it.hasPrevious() || it.previous()->startY != -500000) {
2119 return;
2120 }
2121 FloatingObject *lastFloat;
2122 while (1) {
2123 lastFloat = it.hasPrevious() ? it.previous() : nullptr;
2124 if (!lastFloat || lastFloat->startY != -500000) {
2125 if (lastFloat) {
2126 it.next();
2127 }
2128 break;
2129 }
2130 }
2131 int y = m_height;
2132
2133 // the float can not start above the y position of the last positioned float.
2134 if (lastFloat && lastFloat->startY > y) {
2135 y = lastFloat->startY;
2136 }
2137
2138 KHTMLAssert(it.hasNext());
2139 FloatingObject *f = it.next();
2140
2141 while (f) {
2142 //skip elements copied from elsewhere and positioned elements
2143 if (f->node->containingBlock() != this) {
2144 f = it.hasNext() ? it.next() : nullptr;
2145 continue;
2146 }
2147
2148 RenderObject *o = f->node;
2149 int _height = o->height() + o->marginTop() + o->marginBottom();
2150
2151 // floats avoid page-breaks
2152 if (canvas()->pagedMode()) {
2153 int top = y;
2154 int bottom = y + o->height();
2155 if (crossesPageBreak(top, bottom) && o->height() < canvas()->pageHeight()) {
2156 int newY = pageTopAfter(top);
2157 #ifdef PAGE_DEBUG
2158 qCDebug(KHTML_LOG) << renderName() << " clearing float " << newY - y << "px";
2159 #endif
2160 y = newY;
2161 }
2162 }
2163
2164 int ro = rightOffset(); // Constant part of right offset.
2165 int lo = leftOffset(); // Constant part of left offset.
2166 int fwidth = f->width; // The width we look for.
2167 //qCDebug(KHTML_LOG) << " Object width: " << fwidth << " available width: " << ro - lo;
2168
2169 // in quirk mode, floated auto-width tables try to fit within remaining linewidth
2170 bool ftQuirk = o->isTable() && style()->htmlHacks() && o->style()->width().isAuto();
2171 if (ftQuirk) {
2172 fwidth = qMin(o->minWidth() + o->marginLeft() + o->marginRight(), fwidth);
2173 }
2174
2175 if (ro - lo < fwidth) {
2176 fwidth = ro - lo; // Never look for more than what will be available.
2177 }
2178
2179 if (o->style()->clear() & CLEFT) {
2180 y = qMax(leftBottom(), y);
2181 }
2182 if (o->style()->clear() & CRIGHT) {
2183 y = qMax(rightBottom(), y);
2184 }
2185
2186 bool canClearLine;
2187 if (o->style()->floating() & FLEFT) {
2188 int heightRemainingLeft = 1;
2189 int heightRemainingRight = 1;
2190 int fx = leftRelOffset(y, lo, false, &heightRemainingLeft, &canClearLine);
2191 if (canClearLine) {
2192 while (rightRelOffset(y, ro, false, &heightRemainingRight) - fx < fwidth) {
2193 y += qMin(heightRemainingLeft, heightRemainingRight);
2194 fx = leftRelOffset(y, lo, false, &heightRemainingLeft);
2195 }
2196 }
2197 if (ftQuirk && (rightRelOffset(y, ro, false) - fx < f->width)) {
2198 o->setPos(o->xPos(), y + o->marginTop());
2199 o->setChildNeedsLayout(true, false);
2200 o->layoutIfNeeded();
2201 _height = o->height() + o->marginTop() + o->marginBottom();
2202 f->width = o->width() + o->marginLeft() + o->marginRight();
2203 }
2204 f->left = fx;
2205 //qCDebug(KHTML_LOG) << "positioning left aligned float at (" << fx + o->marginLeft() << "/" << y + o->marginTop() << ") fx=" << fx;
2206 o->setPos(fx + o->marginLeft(), y + o->marginTop());
2207 } else {
2208 int heightRemainingLeft = 1;
2209 int heightRemainingRight = 1;
2210 int fx = rightRelOffset(y, ro, false, &heightRemainingRight, &canClearLine);
2211 if (canClearLine) {
2212 while (fx - leftRelOffset(y, lo, false, &heightRemainingLeft) < fwidth) {
2213 y += qMin(heightRemainingLeft, heightRemainingRight);
2214 fx = rightRelOffset(y, ro, false, &heightRemainingRight);
2215 }
2216 }
2217 if (ftQuirk && (fx - leftRelOffset(y, lo, false) < f->width)) {
2218 o->setPos(o->xPos(), y + o->marginTop());
2219 o->setChildNeedsLayout(true, false);
2220 o->layoutIfNeeded();
2221 _height = o->height() + o->marginTop() + o->marginBottom();
2222 f->width = o->width() + o->marginLeft() + o->marginRight();
2223 }
2224 f->left = fx - f->width;
2225 //qCDebug(KHTML_LOG) << "positioning right aligned float at (" << fx - o->marginRight() - o->width() << "/" << y + o->marginTop() << ")";
2226 o->setPos(fx - o->marginRight() - o->width(), y + o->marginTop());
2227 }
2228
2229 if (m_layer && hasOverflowClip()) {
2230 if (o->xPos() + o->width() > m_overflowWidth) {
2231 m_overflowWidth = o->xPos() + o->width();
2232 } else if (o->xPos() < m_overflowLeft) {
2233 m_overflowLeft = o->xPos();
2234 }
2235 }
2236
2237 f->startY = y;
2238 f->endY = f->startY + _height;
2239
2240 //qCDebug(KHTML_LOG) << "floatingObject x/y= (" << f->left << "/" << f->startY << "-" << f->width << "/" << f->endY - f->startY << ")";
2241
2242 f = it.hasNext() ? it.next() : nullptr;
2243 }
2244 }
2245
newLine()2246 void RenderBlock::newLine()
2247 {
2248 positionNewFloats();
2249 // set y position
2250 int newY = 0;
2251 switch (m_clearStatus) {
2252 case CLEFT:
2253 newY = leftBottom();
2254 break;
2255 case CRIGHT:
2256 newY = rightBottom();
2257 break;
2258 case CBOTH:
2259 newY = floatBottom();
2260 default:
2261 break;
2262 }
2263 if (m_height < newY) {
2264 // qCDebug(KHTML_LOG) << "adjusting y position";
2265 m_height = newY;
2266 }
2267 m_clearStatus = CNONE;
2268 }
2269
2270 int
leftOffset() const2271 RenderBlock::leftOffset() const
2272 {
2273 int left = borderLeft() + paddingLeft();
2274 if (m_layer && scrollsOverflowY() && m_layer->hasReversedScrollbar()) {
2275 left += m_layer->verticalScrollbarWidth();
2276 }
2277 return left;
2278 }
2279
2280 int
leftRelOffset(int y,int fixedOffset,bool applyTextIndent,int * heightRemaining,bool * canClearLine) const2281 RenderBlock::leftRelOffset(int y, int fixedOffset, bool applyTextIndent, int *heightRemaining, bool *canClearLine) const
2282 {
2283 int left = fixedOffset;
2284 if (canClearLine) {
2285 *canClearLine = true;
2286 }
2287
2288 if (m_floatingObjects) {
2289 if (heightRemaining) {
2290 *heightRemaining = 1;
2291 }
2292 FloatingObject *r;
2293 QListIterator<FloatingObject *> it(*m_floatingObjects);
2294 while (it.hasNext()) {
2295 r = it.next();
2296 //qCDebug(KHTML_LOG) <<(void *)this << " left: sy, ey, x, w " << r->startY << "," << r->endY << "," << r->left << "," << r->width << " ";
2297 if (r->startY <= y && r->endY > y &&
2298 r->type == FloatingObject::FloatLeft &&
2299 r->left + r->width > left) {
2300 left = r->left + r->width;
2301 if (heightRemaining) {
2302 *heightRemaining = r->endY - y;
2303 }
2304 if (canClearLine) {
2305 *canClearLine = (r->node->style()->floating() != FLEFT_ALIGN);
2306 }
2307 }
2308 }
2309 }
2310
2311 if (applyTextIndent && m_firstLine && style()->direction() == LTR) {
2312 int cw = 0;
2313 if (style()->textIndent().isPercent()) {
2314 cw = containingBlock()->contentWidth();
2315 }
2316 left += style()->textIndent().minWidth(cw);
2317 }
2318
2319 //qCDebug(KHTML_LOG) << "leftOffset(" << y << ") = " << left;
2320 return left;
2321 }
2322
2323 int
rightOffset() const2324 RenderBlock::rightOffset() const
2325 {
2326 int right = m_width - borderRight() - paddingRight();
2327 if (m_layer && scrollsOverflowY() && !m_layer->hasReversedScrollbar()) {
2328 right -= m_layer->verticalScrollbarWidth();
2329 }
2330 return right;
2331 }
2332
2333 int
rightRelOffset(int y,int fixedOffset,bool applyTextIndent,int * heightRemaining,bool * canClearLine) const2334 RenderBlock::rightRelOffset(int y, int fixedOffset, bool applyTextIndent, int *heightRemaining, bool *canClearLine) const
2335 {
2336 int right = fixedOffset;
2337 if (canClearLine) {
2338 *canClearLine = true;
2339 }
2340
2341 if (m_floatingObjects) {
2342 if (heightRemaining) {
2343 *heightRemaining = 1;
2344 }
2345 FloatingObject *r;
2346 QListIterator<FloatingObject *> it(*m_floatingObjects);
2347 while (it.hasNext()) {
2348 r = it.next();
2349 //qCDebug(KHTML_LOG) << "right: sy, ey, x, w " << r->startY << "," << r->endY << "," << r->left << "," << r->width << " ";
2350 if (r->startY <= y && r->endY > y &&
2351 r->type == FloatingObject::FloatRight &&
2352 r->left < right) {
2353 right = r->left;
2354 if (heightRemaining) {
2355 *heightRemaining = r->endY - y;
2356 }
2357 if (canClearLine) {
2358 *canClearLine = (r->node->style()->floating() != FRIGHT_ALIGN);
2359 }
2360 }
2361 }
2362 }
2363
2364 if (applyTextIndent && m_firstLine && style()->direction() == RTL) {
2365 int cw = 0;
2366 if (style()->textIndent().isPercent()) {
2367 cw = containingBlock()->contentWidth();
2368 }
2369 right -= style()->textIndent().minWidth(cw);
2370 }
2371
2372 //qCDebug(KHTML_LOG) << "rightOffset(" << y << ") = " << right;
2373 return right;
2374 }
2375
2376 unsigned short
lineWidth(int y,bool * canClearLine) const2377 RenderBlock::lineWidth(int y, bool *canClearLine) const
2378 {
2379 //qCDebug(KHTML_LOG) << "lineWidth(" << y << ")=" << rightOffset(y) - leftOffset(y);
2380 int result;
2381 if (canClearLine) {
2382 bool rightCanClearLine;
2383 bool leftCanClearLine;
2384 result = rightOffset(y, &rightCanClearLine) - leftOffset(y, &leftCanClearLine);
2385 *canClearLine = rightCanClearLine && leftCanClearLine;
2386 } else {
2387 result = rightOffset(y) - leftOffset(y);
2388 }
2389 return (result < 0) ? 0 : result;
2390 }
2391
2392 int
nearestFloatBottom(int height) const2393 RenderBlock::nearestFloatBottom(int height) const
2394 {
2395 if (!m_floatingObjects) {
2396 return 0;
2397 }
2398
2399 int bottom = INT_MAX;
2400 FloatingObject *r;
2401 QListIterator<FloatingObject *> it(*m_floatingObjects);
2402 while (it.hasNext()) {
2403 r = it.next();
2404 if (r->endY > height) {
2405 bottom = qMin(r->endY, bottom);
2406 }
2407 }
2408
2409 return bottom == INT_MAX ? 0 : bottom;
2410 }
2411
floatBottom() const2412 int RenderBlock::floatBottom() const
2413 {
2414 if (!m_floatingObjects) {
2415 return 0;
2416 }
2417 int bottom = 0;
2418 FloatingObject *r;
2419 QListIterator<FloatingObject *> it(*m_floatingObjects);
2420 while (it.hasNext()) {
2421 r = it.next();
2422 if (r->endY > bottom) {
2423 bottom = r->endY;
2424 }
2425 }
2426 return bottom;
2427 }
2428
lowestPosition(bool includeOverflowInterior,bool includeSelf) const2429 int RenderBlock::lowestPosition(bool includeOverflowInterior, bool includeSelf) const
2430 {
2431 int bottom = RenderFlow::lowestPosition(includeOverflowInterior, includeSelf);
2432 if (!includeOverflowInterior && hasOverflowClip()) {
2433 return bottom;
2434 }
2435 if (includeSelf && m_overflowHeight > bottom) {
2436 bottom = m_overflowHeight;
2437 }
2438
2439 if (m_floatingObjects) {
2440 FloatingObject *r;
2441 QListIterator<FloatingObject *> it(*m_floatingObjects);
2442 while (it.hasNext()) {
2443 r = it.next();
2444 if (!r->noPaint) {
2445 int lp = r->startY + r->node->marginTop() + r->node->lowestPosition(false);
2446 bottom = qMax(bottom, lp);
2447 }
2448 }
2449 }
2450 bottom = qMax(bottom, lowestAbsolutePosition());
2451
2452 if (!includeSelf && lastLineBox()) {
2453 int lp = lastLineBox()->yPos() + lastLineBox()->height();
2454 bottom = qMax(bottom, lp);
2455 }
2456
2457 return bottom;
2458 }
2459
lowestAbsolutePosition() const2460 int RenderBlock::lowestAbsolutePosition() const
2461 {
2462 if (!m_positionedObjects) {
2463 return 0;
2464 }
2465
2466 // Fixed positioned objects do not scroll and thus should not constitute
2467 // part of the lowest position.
2468 int bottom = 0;
2469 RenderObject *r;
2470 QListIterator<RenderObject *> it(*m_positionedObjects);
2471 while (it.hasNext()) {
2472 r = it.next();
2473 if (r->style()->position() == PFIXED) {
2474 continue;
2475 }
2476 int lp = r->yPos() + r->lowestPosition(false);
2477 bottom = qMax(bottom, lp);
2478 }
2479 return bottom;
2480 }
2481
rightmostPosition(bool includeOverflowInterior,bool includeSelf) const2482 int RenderBlock::rightmostPosition(bool includeOverflowInterior, bool includeSelf) const
2483 {
2484 int right = RenderFlow::rightmostPosition(includeOverflowInterior, includeSelf);
2485 if (!includeOverflowInterior && hasOverflowClip()) {
2486 return right;
2487 }
2488 if (includeSelf && m_overflowWidth > right) {
2489 right = m_overflowWidth;
2490 }
2491
2492 if (m_floatingObjects) {
2493 FloatingObject *r;
2494 QListIterator<FloatingObject *> it(*m_floatingObjects);
2495 while (it.hasNext()) {
2496 r = it.next();
2497 if (!r->noPaint) {
2498 int rp = r->left + r->node->marginLeft() + r->node->rightmostPosition(false);
2499 right = qMax(right, rp);
2500 }
2501 }
2502 }
2503 right = qMax(right, rightmostAbsolutePosition());
2504
2505 if (!includeSelf && firstLineBox()) {
2506 for (InlineRunBox *currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) {
2507 int rp = currBox->xPos() + currBox->width();
2508 right = qMax(right, rp);
2509 }
2510 }
2511
2512 return right;
2513 }
2514
rightmostAbsolutePosition() const2515 int RenderBlock::rightmostAbsolutePosition() const
2516 {
2517 if (!m_positionedObjects) {
2518 return 0;
2519 }
2520 int right = 0;
2521 RenderObject *r;
2522 QListIterator<RenderObject *> it(*m_positionedObjects);
2523 while (it.hasNext()) {
2524 r = it.next();
2525 if (r->style()->position() == PFIXED) {
2526 continue;
2527 }
2528 int rp = r->xPos() + r->rightmostPosition(false);
2529 right = qMax(right, rp);
2530 }
2531 return right;
2532 }
2533
leftmostPosition(bool includeOverflowInterior,bool includeSelf) const2534 int RenderBlock::leftmostPosition(bool includeOverflowInterior, bool includeSelf) const
2535 {
2536 int left = RenderFlow::leftmostPosition(includeOverflowInterior, includeSelf);
2537 if (!includeOverflowInterior && hasOverflowClip()) {
2538 return left;
2539 }
2540
2541 if (includeSelf && m_overflowLeft < left) {
2542 left = m_overflowLeft;
2543 }
2544
2545 if (m_floatingObjects) {
2546 FloatingObject *r;
2547 QListIterator<FloatingObject *> it(*m_floatingObjects);
2548 while (it.hasNext()) {
2549 r = it.next();
2550 if (!r->noPaint) {
2551 int lp = r->left + r->node->marginLeft() + r->node->leftmostPosition(false);
2552 left = qMin(left, lp);
2553 }
2554 }
2555 }
2556 left = qMin(left, leftmostAbsolutePosition());
2557
2558 if (!includeSelf && firstLineBox()) {
2559 for (InlineRunBox *currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) {
2560 left = qMin(left, (int)currBox->xPos());
2561 }
2562 }
2563
2564 return left;
2565 }
2566
leftmostAbsolutePosition() const2567 int RenderBlock::leftmostAbsolutePosition() const
2568 {
2569 if (!m_positionedObjects) {
2570 return 0;
2571 }
2572 int left = 0;
2573 RenderObject *r;
2574 QListIterator<RenderObject *> it(*m_positionedObjects);
2575 while (it.hasNext()) {
2576 r = it.next();
2577 if (r->style()->position() == PFIXED) {
2578 continue;
2579 }
2580 int lp = r->xPos() + r->leftmostPosition(false);
2581 left = qMin(left, lp);
2582 }
2583 return left;
2584 }
2585
highestPosition(bool includeOverflowInterior,bool includeSelf) const2586 int RenderBlock::highestPosition(bool includeOverflowInterior, bool includeSelf) const
2587 {
2588 int top = RenderFlow::highestPosition(includeOverflowInterior, includeSelf);
2589 if (!includeOverflowInterior && hasOverflowClip()) {
2590 return top;
2591 }
2592
2593 if (includeSelf && m_overflowTop < top) {
2594 top = m_overflowTop;
2595 }
2596
2597 if (m_floatingObjects) {
2598 FloatingObject *r;
2599 QListIterator<FloatingObject *> it(*m_floatingObjects);
2600 while (it.hasNext()) {
2601 r = it.next();
2602 if (!r->noPaint) {
2603 int hp = r->startY + r->node->marginTop() + r->node->highestPosition(false);
2604 top = qMin(top, hp);
2605 }
2606 }
2607 }
2608 top = qMin(top, highestAbsolutePosition());
2609
2610 if (!includeSelf && firstLineBox()) {
2611 top = qMin(top, (int)firstLineBox()->yPos());
2612 }
2613
2614 return top;
2615 }
2616
highestAbsolutePosition() const2617 int RenderBlock::highestAbsolutePosition() const
2618 {
2619 if (!m_positionedObjects) {
2620 return 0;
2621 }
2622 int top = 0;
2623 RenderObject *r;
2624 QListIterator<RenderObject *> it(*m_positionedObjects);
2625 while (it.hasNext()) {
2626 r = it.next();
2627 if (r->style()->position() == PFIXED) {
2628 continue;
2629 }
2630 int hp = r->yPos() + r->highestPosition(false);
2631 hp = qMin(top, hp);
2632 }
2633 return top;
2634 }
2635
2636 int
leftBottom()2637 RenderBlock::leftBottom()
2638 {
2639 if (!m_floatingObjects) {
2640 return 0;
2641 }
2642 int bottom = 0;
2643 FloatingObject *r;
2644 QListIterator<FloatingObject *> it(*m_floatingObjects);
2645 while (it.hasNext()) {
2646 r = it.next();
2647 if (r->endY > bottom && r->type == FloatingObject::FloatLeft) {
2648 bottom = r->endY;
2649 }
2650 }
2651 return bottom;
2652 }
2653
2654 int
rightBottom()2655 RenderBlock::rightBottom()
2656 {
2657 if (!m_floatingObjects) {
2658 return 0;
2659 }
2660 int bottom = 0;
2661 FloatingObject *r;
2662 QListIterator<FloatingObject *> it(*m_floatingObjects);
2663 while (it.hasNext()) {
2664 r = it.next();
2665 if (r->endY > bottom && r->type == FloatingObject::FloatRight) {
2666 bottom = r->endY;
2667 }
2668 }
2669 return bottom;
2670 }
2671
2672 void
clearFloats()2673 RenderBlock::clearFloats()
2674 {
2675 if (m_floatingObjects) {
2676 QListIterator<FloatingObject *> it(*m_floatingObjects);
2677 while (it.hasNext()) {
2678 delete it.next();
2679 }
2680 m_floatingObjects->clear();
2681 }
2682
2683 // we are done if the element defines a new block formatting context
2684 if (flowAroundFloats() || isRoot() || isCanvas() || isFloatingOrPositioned() || isTableCell()) {
2685 return;
2686 }
2687
2688 RenderObject *prev = previousSibling();
2689
2690 // find the element to copy the floats from
2691 // pass non-flows
2692 // pass fAF's
2693 bool parentHasFloats = false;
2694 while (prev) {
2695 if (!prev->isRenderBlock() || prev->isFloatingOrPositioned() || prev->flowAroundFloats()) {
2696 if (prev->isFloating() && parent()->isRenderBlock()) {
2697 parentHasFloats = true;
2698 }
2699 prev = prev->previousSibling();
2700 } else {
2701 break;
2702 }
2703 }
2704
2705 int offset = m_y;
2706 if (parentHasFloats) {
2707 addOverHangingFloats(static_cast<RenderBlock *>(parent()),
2708 parent()->borderLeft() + parent()->paddingLeft(), offset, false);
2709 }
2710
2711 int xoffset = 0;
2712 if (prev) {
2713 if (prev->isTableCell()) {
2714 return;
2715 }
2716 offset -= prev->yPos();
2717 } else {
2718 prev = parent();
2719 if (!prev) {
2720 return;
2721 }
2722 xoffset += prev->borderLeft() + prev->paddingLeft();
2723 }
2724 //qCDebug(KHTML_LOG) << "RenderBlock::clearFloats found previous "<< (void *)this << " prev=" << (void *)prev;
2725
2726 // add overhanging special objects from the previous RenderBlock
2727 if (!prev->isRenderBlock()) {
2728 return;
2729 }
2730 RenderBlock *flow = static_cast<RenderBlock *>(prev);
2731 if (!flow->m_floatingObjects) {
2732 return;
2733 }
2734 if (flow->floatBottom() > offset) {
2735 addOverHangingFloats(flow, xoffset, offset, false);
2736 }
2737 }
2738
addOverHangingFloats(RenderBlock * flow,int xoff,int offset,bool child)2739 void RenderBlock::addOverHangingFloats(RenderBlock *flow, int xoff, int offset, bool child)
2740 {
2741 #ifdef DEBUG_LAYOUT
2742 qCDebug(KHTML_LOG) << (void *)this << ": adding overhanging floats xoff=" << xoff << " offset=" << offset << " child=" << child;
2743 #endif
2744
2745 // Prevent floats from being added to the canvas by the root element, e.g., <html>.
2746 if (!flow->m_floatingObjects || (child && flow->isRoot())) {
2747 return;
2748 }
2749
2750 // if I am clear of my floats, don't add them
2751 // the CSS spec also mentions that child floats
2752 // are not cleared.
2753 if (!child && style()->clear() == CBOTH) {
2754 return;
2755 }
2756
2757 QListIterator<FloatingObject *> it(*flow->m_floatingObjects);
2758 FloatingObject *r;
2759 while (it.hasNext()) {
2760 r = it.next();
2761
2762 if (!child && r->type == FloatingObject::FloatLeft && style()->clear() == CLEFT) {
2763 continue;
2764 }
2765 if (!child && r->type == FloatingObject::FloatRight && style()->clear() == CRIGHT) {
2766 continue;
2767 }
2768
2769 if ((!child && r->endY > offset) ||
2770 (child && flow->yPos() + r->endY > height())) {
2771 if (child && !r->crossedLayer) {
2772 if (flow->enclosingLayer() == enclosingLayer()) {
2773 // Set noPaint to true only if we didn't cross layers.
2774 r->noPaint = true;
2775 } else {
2776 r->crossedLayer = true;
2777 }
2778 }
2779
2780 // don't insert it twice!
2781 if (!containsFloat(r->node)) {
2782 FloatingObject *floatingObj = new FloatingObject(KDE_CAST_BF_ENUM(FloatingObject::Type, r->type));
2783 floatingObj->startY = r->startY - offset;
2784 floatingObj->endY = r->endY - offset;
2785 floatingObj->left = r->left - xoff;
2786 // Applying the child's margin makes no sense in the case where the child was passed in.
2787 // since his own margin was added already through the subtraction of the |xoff| variable
2788 // above. |xoff| will equal -flow->marginLeft() in this case, so it's already been taken
2789 // into account. Only apply this code if |child| is false, since otherwise the left margin
2790 // will get applied twice. -dwh
2791 if (!child && flow != parent()) {
2792 floatingObj->left += flow->marginLeft();
2793 }
2794 if (!child) {
2795 floatingObj->left -= marginLeft();
2796 floatingObj->noPaint = true;
2797 } else {
2798 floatingObj->noPaint = (r->crossedLayer || !r->noPaint);
2799 floatingObj->crossedLayer = r->crossedLayer;
2800 }
2801
2802 floatingObj->width = r->width;
2803 floatingObj->node = r->node;
2804 if (!m_floatingObjects) {
2805 m_floatingObjects = new QList<FloatingObject *>;
2806 }
2807 m_floatingObjects->append(floatingObj);
2808 #ifdef DEBUG_LAYOUT
2809 qCDebug(KHTML_LOG) << "addOverHangingFloats x/y= (" << floatingObj->left << "/" << floatingObj->startY << "-" << floatingObj->width << "/" << floatingObj->endY - floatingObj->startY << ")";
2810 #endif
2811 }
2812 }
2813 }
2814 }
2815
containsFloat(RenderObject * o) const2816 bool RenderBlock::containsFloat(RenderObject *o) const
2817 {
2818 if (m_floatingObjects) {
2819 QListIterator<FloatingObject *> it(*m_floatingObjects);
2820 while (it.hasNext()) {
2821 if (it.next()->node == o) {
2822 return true;
2823 }
2824 }
2825 }
2826 return false;
2827 }
2828
markAllDescendantsWithFloatsForLayout(RenderObject * floatToRemove)2829 void RenderBlock::markAllDescendantsWithFloatsForLayout(RenderObject *floatToRemove)
2830 {
2831 dirtyFormattingContext(false);
2832 setChildNeedsLayout(true);
2833
2834 if (floatToRemove) {
2835 removeFloatingObject(floatToRemove);
2836 }
2837
2838 // Iterate over our children and mark them as needed.
2839 if (!childrenInline()) {
2840 for (RenderObject *child = firstChild(); child; child = child->nextSibling()) {
2841 if (isBlockFlow() && !child->isFloatingOrPositioned() &&
2842 ((floatToRemove ? child->containsFloat(floatToRemove) : child->hasFloats()) || child->usesLineWidth())) {
2843 child->markAllDescendantsWithFloatsForLayout(floatToRemove);
2844 }
2845 }
2846 }
2847 }
2848
getClearDelta(RenderObject * child,int yPos)2849 int RenderBlock::getClearDelta(RenderObject *child, int yPos)
2850 {
2851 if (!hasFloats()) {
2852 return 0;
2853 }
2854
2855 //qCDebug(KHTML_LOG) << "getClearDelta on child " << child << " oldheight=" << m_height;
2856 bool clearSet = child->style()->clear() != CNONE;
2857 int bottom = 0;
2858 switch (child->style()->clear()) {
2859 case CNONE:
2860 break;
2861 case CLEFT:
2862 bottom = leftBottom();
2863 break;
2864 case CRIGHT:
2865 bottom = rightBottom();
2866 break;
2867 case CBOTH:
2868 bottom = floatBottom();
2869 break;
2870 }
2871
2872 // We also clear floats if we are too big to sit on the same line as
2873 // a float, and happen to flow around floats.
2874 int result = clearSet ? qMax(0, bottom - yPos) : 0;
2875 if (!result && child->flowAroundFloats()) {
2876 bool canClear = true;
2877 bool needsRecalc = child->usesLineWidth();
2878 int cury = yPos;
2879 int childw = 0;
2880 int aw = contentWidth();
2881 #if 0
2882 // this is a silly Gecko compatibility hack - enable only if it becomes
2883 // necessary, and then check regularly with new Gecko versions
2884 if (!style()->hasBorder()) {
2885 RenderObject *ps = child;
2886 while ((ps = ps->previousSibling())) {
2887 if (!ps->isFloating() && !ps->isPositioned()) {
2888 break;
2889 }
2890 }
2891 if (!ps) {
2892 return 0;
2893 }
2894 }
2895 #endif
2896 while (true) {
2897 int curw = lineWidth(cury, &canClear);
2898 if (!canClear || curw == aw) {
2899 return cury - yPos;
2900 }
2901 if (!childw || needsRecalc) {
2902 int oy = child->yPos();
2903 int ow = child->width();
2904 child->setPos(child->xPos(), cury);
2905 child->calcWidth();
2906 childw = child->width();
2907 child->setPos(child->xPos(), oy);
2908 child->setWidth(ow);
2909 }
2910 if (childw <= curw) {
2911 return cury - yPos;
2912 }
2913 if (!(cury = nearestFloatBottom(cury))) {
2914 return 0;
2915 }
2916 }
2917 }
2918 return result;
2919 }
2920
isPointInScrollbar(int _x,int _y,int _tx,int _ty)2921 bool RenderBlock::isPointInScrollbar(int _x, int _y, int _tx, int _ty)
2922 {
2923 if (!scrollsOverflow() || !m_layer) {
2924 return false;
2925 }
2926
2927 if (m_layer->verticalScrollbarWidth()) {
2928 bool rtl = QApplication::isRightToLeft();
2929 QRect vertRect(_tx + (rtl ? borderLeft() : width() - borderRight() - m_layer->verticalScrollbarWidth()),
2930 _ty + borderTop() - borderTopExtra(),
2931 m_layer->verticalScrollbarWidth(),
2932 height() + borderTopExtra() + borderBottomExtra() - borderTop() - borderBottom());
2933 if (vertRect.contains(_x, _y)) {
2934 RenderLayer::gScrollBar = m_layer->verticalScrollbar();
2935 return true;
2936 }
2937 }
2938
2939 if (m_layer->horizontalScrollbarHeight()) {
2940 QRect horizRect(_tx + borderLeft(),
2941 _ty + height() - borderBottom() + borderBottomExtra() - m_layer->horizontalScrollbarHeight(),
2942 width() - borderLeft() - borderRight(),
2943 m_layer->horizontalScrollbarHeight());
2944 if (horizRect.contains(_x, _y)) {
2945 RenderLayer::gScrollBar = m_layer->horizontalScrollbar();
2946 return true;
2947 }
2948 }
2949
2950 return false;
2951 }
2952
nodeAtPoint(NodeInfo & info,int _x,int _y,int _tx,int _ty,HitTestAction hitTestAction,bool inBox)2953 bool RenderBlock::nodeAtPoint(NodeInfo &info, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction, bool inBox)
2954 {
2955 bool inScrollbar = isPointInScrollbar(_x, _y, _tx + xPos(), _ty + yPos());
2956 if (inScrollbar && hitTestAction != HitTestChildrenOnly) {
2957 inBox = true;
2958 }
2959
2960 if (hitTestAction != HitTestSelfOnly && m_floatingObjects && !inScrollbar) {
2961 int stx = _tx + xPos();
2962 int sty = _ty + yPos();
2963 if (hasOverflowClip() && m_layer) {
2964 m_layer->subtractScrollOffset(stx, sty);
2965 }
2966 FloatingObject *o;
2967 QListIterator<FloatingObject *> it(*m_floatingObjects);
2968 it.toBack();
2969 while (it.hasPrevious()) {
2970 o = it.previous();
2971 if (!o->noPaint && !o->node->layer())
2972 inBox |= o->node->nodeAtPoint(info, _x, _y,
2973 stx + o->left + o->node->marginLeft() - o->node->xPos(),
2974 sty + o->startY + o->node->marginTop() - o->node->yPos(), HitTestAll);
2975 }
2976 }
2977 inBox |= RenderFlow::nodeAtPoint(info, _x, _y, _tx, _ty, hitTestAction, inBox);
2978 return inBox;
2979 }
2980
positionForBox(InlineBox * box,bool start) const2981 RenderPosition RenderBlock::positionForBox(InlineBox *box, bool start) const
2982 {
2983 if (!box) {
2984 return RenderPosition();
2985 }
2986
2987 if (!box->object()->element()) {
2988 return RenderPosition(element(), start ? caretMinOffset() : caretMaxOffset());
2989 }
2990
2991 if (!box->isInlineTextBox()) {
2992 return RenderPosition(box->object()->element(), start ? box->object()->caretMinOffset() : box->object()->caretMaxOffset());
2993 }
2994
2995 InlineTextBox *textBox = static_cast<InlineTextBox *>(box);
2996 return RenderPosition(box->object()->element(), start ? textBox->start() : textBox->start() + textBox->len());
2997 }
2998
positionForRenderer(RenderObject * renderer,bool start) const2999 RenderPosition RenderBlock::positionForRenderer(RenderObject *renderer, bool start) const
3000 {
3001 if (!renderer) {
3002 return RenderPosition(element(), 0);
3003 }
3004
3005 NodeImpl *node = renderer->element() ? renderer->element() : element();
3006 if (!node) {
3007 return RenderPosition();
3008 }
3009
3010 long offset = start ? node->caretMinOffset() : node->caretMaxOffset();
3011 return RenderPosition(node, offset);
3012 }
3013
positionForCoordinates(int _x,int _y)3014 RenderPosition RenderBlock::positionForCoordinates(int _x, int _y)
3015 {
3016 if (isTable()) {
3017 return RenderFlow::positionForCoordinates(_x, _y);
3018 }
3019
3020 int absx, absy;
3021 absolutePosition(absx, absy);
3022
3023 int top = absy + borderTop() + paddingTop();
3024 int bottom = top + contentHeight();
3025
3026 if (_y < top)
3027 // y coordinate is above block
3028 {
3029 return positionForRenderer(firstLeafChild(), true);
3030 }
3031
3032 if (_y >= bottom)
3033 // y coordinate is below block
3034 {
3035 return positionForRenderer(lastLeafChild(), false);
3036 }
3037
3038 if (childrenInline()) {
3039 if (!firstRootBox()) {
3040 return Position(element(), 0);
3041 }
3042
3043 if (_y >= top && _y < absy + firstRootBox()->topOverflow())
3044 // y coordinate is above first root line box
3045 {
3046 return positionForBox(firstRootBox()->firstLeafChild(), true);
3047 }
3048
3049 // look for the closest line box in the root box which is at the passed-in y coordinate
3050 for (RootInlineBox *root = firstRootBox(); root; root = root->nextRootBox()) {
3051 top = absy + root->topOverflow();
3052 // set the bottom based on whether there is a next root box
3053 if (root->nextRootBox()) {
3054 bottom = absy + root->nextRootBox()->topOverflow();
3055 } else {
3056 bottom = absy + root->bottomOverflow();
3057 }
3058 // check if this root line box is located at this y coordinate
3059 if (_y >= top && _y < bottom && root->firstChild()) {
3060 InlineBox *closestBox = root->closestLeafChildForXPos(_x, absx);
3061 if (closestBox) {
3062 // pass the box a y position that is inside it
3063 return closestBox->object()->positionForCoordinates(_x, absy + closestBox->m_y);
3064 }
3065 }
3066 }
3067
3068 if (lastRootBox())
3069 // y coordinate is below last root line box
3070 {
3071 return positionForBox(lastRootBox()->lastLeafChild(), false);
3072 }
3073
3074 return RenderPosition(element(), 0);
3075 }
3076
3077 // see if any child blocks exist at this y coordinate
3078 for (RenderObject *renderer = firstChild(); renderer; renderer = renderer->nextSibling()) {
3079 if (renderer->isFloatingOrPositioned()) {
3080 continue;
3081 }
3082 renderer->absolutePosition(absx, top);
3083 RenderObject *next = renderer->nextSibling();
3084 while (next && next->isFloatingOrPositioned()) {
3085 next = next->nextSibling();
3086 }
3087 if (next) {
3088 next->absolutePosition(absx, bottom);
3089 } else {
3090 bottom = top + contentHeight();
3091 }
3092 if (_y >= top && _y < bottom) {
3093 return renderer->positionForCoordinates(_x, _y);
3094 }
3095 }
3096
3097 // pass along to the first child
3098 if (firstChild()) {
3099 return firstChild()->positionForCoordinates(_x, _y);
3100 }
3101
3102 // still no luck...return this render object's element and offset 0
3103 return RenderPosition(element(), 0);
3104 }
3105
calcMinMaxWidth()3106 void RenderBlock::calcMinMaxWidth()
3107 {
3108 KHTMLAssert(!minMaxKnown());
3109
3110 #ifdef DEBUG_LAYOUT
3111 qCDebug(KHTML_LOG) << renderName() << "(RenderBlock)::calcMinMaxWidth() this=" << this;
3112 #endif
3113 if (!isTableCell() && style()->width().isFixed() && style()->width().isPositive()) {
3114 m_minWidth = m_maxWidth = calcContentWidth(style()->width().value());
3115 } else {
3116 m_minWidth = 0;
3117 m_maxWidth = 0;
3118
3119 bool noWrap = !style()->autoWrap();
3120 if (childrenInline()) {
3121 calcInlineMinMaxWidth();
3122 } else {
3123 calcBlockMinMaxWidth();
3124 }
3125
3126 if (m_maxWidth < m_minWidth) {
3127 m_maxWidth = m_minWidth;
3128 }
3129
3130 if (noWrap && childrenInline()) {
3131 m_minWidth = m_maxWidth;
3132
3133 // A horizontal marquee with inline children has no minimum width.
3134 if (style()->overflowX() == OMARQUEE && m_layer && m_layer->marquee() &&
3135 m_layer->marquee()->isHorizontal() && !m_layer->marquee()->isUnfurlMarquee()) {
3136 m_minWidth = 0;
3137 }
3138 }
3139
3140 if (isTableCell()) {
3141 Length w = static_cast<RenderTableCell *>(this)->styleOrColWidth();
3142 if (w.isFixed() && w.isPositive()) {
3143 m_maxWidth = qMax((int)m_minWidth, calcContentWidth(w.value()));
3144 }
3145 }
3146 }
3147
3148 if (style()->minWidth().isFixed() && style()->minWidth().isPositive()) {
3149 m_maxWidth = qMax(m_maxWidth, (int)calcContentWidth(style()->minWidth().value()));
3150 m_minWidth = qMax(m_minWidth, (short)calcContentWidth(style()->minWidth().value()));
3151 }
3152
3153 if (style()->maxWidth().isFixed() && !style()->maxWidth().isUndefined()) {
3154 m_maxWidth = qMin(m_maxWidth, (int)calcContentWidth(style()->maxWidth().value()));
3155 m_minWidth = qMin(m_minWidth, (short)calcContentWidth(style()->maxWidth().value()));
3156 }
3157
3158 int toAdd = 0;
3159 toAdd = borderLeft() + borderRight() + paddingLeft() + paddingRight();
3160
3161 m_minWidth += toAdd;
3162 m_maxWidth += toAdd;
3163
3164 setMinMaxKnown();
3165
3166 //qCDebug(KHTML_LOG) << "Text::calcMinMaxWidth(" << this << "): min = " << m_minWidth << " max = " << m_maxWidth;
3167 // ### compare with min/max width set in style sheet...
3168 }
3169
3170 // bidi.cpp defines the following functions too.
3171 // Maybe these should not be static, after all...
3172
getBPMWidth(int childValue,Length cssUnit)3173 static int getBPMWidth(int childValue, Length cssUnit)
3174 {
3175 if (!cssUnit.isAuto()) {
3176 return (cssUnit.isFixed() ? cssUnit.value() : childValue);
3177 }
3178 return 0;
3179 }
3180
getBorderPaddingMargin(RenderObject * child,bool endOfInline)3181 static int getBorderPaddingMargin(RenderObject *child, bool endOfInline)
3182 {
3183 RenderStyle *cstyle = child->style();
3184 int result = 0;
3185 bool leftSide = (cstyle->direction() == LTR) ? !endOfInline : endOfInline;
3186 result += getBPMWidth((leftSide ? child->marginLeft() : child->marginRight()),
3187 (leftSide ? cstyle->marginLeft() :
3188 cstyle->marginRight()));
3189 result += getBPMWidth((leftSide ? child->paddingLeft() : child->paddingRight()),
3190 (leftSide ? cstyle->paddingLeft() :
3191 cstyle->paddingRight()));
3192 result += leftSide ? child->borderLeft() : child->borderRight();
3193 return result;
3194 }
3195
stripTrailingSpace(bool preserveWS,int & inlineMax,int & inlineMin,RenderObject * trailingSpaceChild)3196 static void stripTrailingSpace(bool preserveWS,
3197 int &inlineMax, int &inlineMin,
3198 RenderObject *trailingSpaceChild)
3199 {
3200 if (!preserveWS && trailingSpaceChild && trailingSpaceChild->isText()) {
3201 // Collapse away the trailing space at the end of a block.
3202 RenderText *t = static_cast<RenderText *>(trailingSpaceChild);
3203 const Font *f = t->htmlFont(false);
3204 QChar space[1]; space[0] = ' ';
3205 int spaceWidth = f->charWidth(space, 1, 0, true/*fast algo*/);
3206 inlineMax -= spaceWidth;
3207 if (inlineMin > inlineMax) {
3208 inlineMin = inlineMax;
3209 }
3210 }
3211 }
3212
calcInlineMinMaxWidth()3213 void RenderBlock::calcInlineMinMaxWidth()
3214 {
3215 int inlineMax = 0;
3216 int inlineMin = 0;
3217
3218 int cw = containingBlock()->contentWidth();
3219
3220 // If we are at the start of a line, we want to ignore all white-space.
3221 // Also strip spaces if we previously had text that ended in a trailing space.
3222 bool stripFrontSpaces = true;
3223
3224 bool isTcQuirk = isTableCell() && style()->htmlHacks() && style()->width().isAuto();
3225
3226 RenderObject *trailingSpaceChild = nullptr;
3227
3228 bool autoWrap, oldAutoWrap;
3229 autoWrap = oldAutoWrap = style()->autoWrap();
3230
3231 InlineMinMaxIterator childIterator(this, this);
3232 bool addedTextIndent = false; // Only gets added in once.
3233 RenderObject *prevFloat = nullptr;
3234 while (RenderObject *child = childIterator.next()) {
3235 autoWrap = child->isReplaced() ? child->parent()->style()->autoWrap() : child->style()->autoWrap();
3236
3237 if (!child->isBR()) {
3238 // Step One: determine whether or not we need to go ahead and
3239 // terminate our current line. Each discrete chunk can become
3240 // the new min-width, if it is the widest chunk seen so far, and
3241 // it can also become the max-width.
3242
3243 // Children fall into three categories:
3244 // (1) An inline flow object. These objects always have a min/max of 0,
3245 // and are included in the iteration solely so that their margins can
3246 // be added in.
3247 //
3248 // (2) An inline non-text non-flow object, e.g., an inline replaced element.
3249 // These objects can always be on a line by themselves, so in this situation
3250 // we need to go ahead and break the current line, and then add in our own
3251 // margins and min/max width on its own line, and then terminate the line.
3252 //
3253 // (3) A text object. Text runs can have breakable characters at the start,
3254 // the middle or the end. They may also lose whitespace off the front if
3255 // we're already ignoring whitespace. In order to compute accurate min-width
3256 // information, we need three pieces of information.
3257 // (a) the min-width of the first non-breakable run. Should be 0 if the text string
3258 // starts with whitespace.
3259 // (b) the min-width of the last non-breakable run. Should be 0 if the text string
3260 // ends with whitespace.
3261 // (c) the min/max width of the string (trimmed for whitespace).
3262 //
3263 // If the text string starts with whitespace, then we need to go ahead and
3264 // terminate our current line (unless we're already in a whitespace stripping
3265 // mode.
3266 //
3267 // If the text string has a breakable character in the middle, but didn't start
3268 // with whitespace, then we add the width of the first non-breakable run and
3269 // then end the current line. We then need to use the intermediate min/max width
3270 // values (if any of them are larger than our current min/max). We then look at
3271 // the width of the last non-breakable run and use that to start a new line
3272 // (unless we end in whitespace).
3273 RenderStyle *cstyle = child->style();
3274 int childMin = 0;
3275 int childMax = 0;
3276
3277 if (!child->isText()) {
3278 // Case (1) and (2). Inline replaced and inline flow elements.
3279 if (child->isInlineFlow()) {
3280 // Add in padding/border/margin from the appropriate side of
3281 // the element.
3282 int bpm = getBorderPaddingMargin(child, childIterator.endOfInline);
3283 childMin += bpm;
3284 childMax += bpm;
3285
3286 inlineMin += childMin;
3287 inlineMax += childMax;
3288 if (child->isWordBreak()) {
3289 // End a line and start a new line.
3290 m_minWidth = qMax(inlineMin, (int)m_minWidth);
3291 inlineMin = 0;
3292 }
3293 } else {
3294 // Inline replaced elements add in their margins to their min/max values.
3295 int margins = 0;
3296 LengthType type = cstyle->marginLeft().type();
3297 if (type == Fixed) {
3298 margins += cstyle->marginLeft().value();
3299 }
3300 type = cstyle->marginRight().type();
3301 if (type == Fixed) {
3302 margins += cstyle->marginRight().value();
3303 }
3304 childMin += margins;
3305 childMax += margins;
3306 }
3307 }
3308
3309 if (!child->isRenderInline() && !child->isText()) {
3310 // Case (2). Inline replaced elements and floats.
3311
3312 // Common wrapping quirk
3313 bool qBreak = isTcQuirk && !child->isFloating();
3314
3315 childMin += child->minWidth();
3316 childMax += child->maxWidth();
3317
3318 // Check our "clear" setting.
3319 bool clearPreviousFloat = false;
3320 if (child->isFloating()) {
3321 if (prevFloat &&
3322 (((prevFloat->style()->floating() & FLEFT) && (child->style()->clear() & CLEFT)) ||
3323 ((prevFloat->style()->floating() & FRIGHT) && (child->style()->clear() & CRIGHT)))) {
3324 clearPreviousFloat = true;
3325 }
3326 prevFloat = child;
3327 }
3328
3329 if ((!qBreak && (autoWrap || oldAutoWrap)) || clearPreviousFloat) {
3330 if (m_minWidth < inlineMin) {
3331 m_minWidth = inlineMin;
3332 }
3333 inlineMin = 0;
3334 }
3335
3336 // If we're supposed to clear the previous float, then terminate maxwidth as well.
3337 if (clearPreviousFloat) {
3338 m_maxWidth = qMax(inlineMax, m_maxWidth);
3339 inlineMax = 0;
3340 }
3341
3342 // Add in text-indent. This is added in only once.
3343 int ti = 0;
3344 if (!addedTextIndent) {
3345 addedTextIndent = true;
3346 ti = style()->textIndent().minWidth(cw);
3347 childMin += ti;
3348 childMax += ti;
3349 }
3350
3351 // Add our width to the max.
3352 inlineMax += childMax;
3353
3354 if ((!autoWrap && !child->isFloating()) || qBreak) {
3355 inlineMin += childMin;
3356 } else {
3357 // Now check our line.
3358 m_minWidth = qMax(childMin, (int)m_minWidth);
3359
3360 // Now start a new line.
3361 inlineMin = 0;
3362 }
3363
3364 // We are no longer stripping whitespace at the start of
3365 // a line.
3366 if (!child->isFloating()) {
3367 stripFrontSpaces = false;
3368 trailingSpaceChild = nullptr;
3369 }
3370 } else if (child->isText()) {
3371 // Case (3). Text.
3372 RenderText *t = static_cast<RenderText *>(child);
3373
3374 // Determine if we have a breakable character. Pass in
3375 // whether or not we should ignore any spaces at the front
3376 // of the string. If those are going to be stripped out,
3377 // then they shouldn't be considered in the breakable char
3378 // check.
3379 bool hasBreakableChar, hasBreak;
3380 int beginMin, endMin;
3381 bool beginWS, endWS;
3382 int beginMax, endMax;
3383 t->trimmedMinMaxWidth(beginMin, beginWS, endMin, endWS, hasBreakableChar,
3384 hasBreak, beginMax, endMax,
3385 childMin, childMax, stripFrontSpaces);
3386
3387 // This text object is insignificant and will not be rendered. Just
3388 // continue.
3389 if (!hasBreak && childMax == 0) {
3390 continue;
3391 }
3392
3393 if (stripFrontSpaces) {
3394 trailingSpaceChild = child;
3395 } else {
3396 trailingSpaceChild = nullptr;
3397 }
3398
3399 // Add in text-indent. This is added in only once.
3400 int ti = 0;
3401 if (!addedTextIndent) {
3402 addedTextIndent = true;
3403 ti = style()->textIndent().minWidth(cw);
3404 childMin += ti; beginMin += ti;
3405 childMax += ti; beginMax += ti;
3406 }
3407
3408 // If we have no breakable characters at all,
3409 // then this is the easy case. We add ourselves to the current
3410 // min and max and continue.
3411 if (!hasBreakableChar) {
3412 inlineMin += childMin;
3413 } else {
3414 // We have a breakable character. Now we need to know if
3415 // we start and end with whitespace.
3416 if (beginWS) {
3417 // Go ahead and end the current line.
3418 if (m_minWidth < inlineMin) {
3419 m_minWidth = inlineMin;
3420 }
3421 } else {
3422 inlineMin += beginMin;
3423 if (m_minWidth < inlineMin) {
3424 m_minWidth = inlineMin;
3425 }
3426 childMin -= ti;
3427 }
3428
3429 inlineMin = childMin;
3430
3431 if (endWS) {
3432 // We end in whitespace, which means we can go ahead
3433 // and end our current line.
3434 if (m_minWidth < inlineMin) {
3435 m_minWidth = inlineMin;
3436 }
3437 inlineMin = 0;
3438 } else {
3439 if (m_minWidth < inlineMin) {
3440 m_minWidth = inlineMin;
3441 }
3442 inlineMin = endMin;
3443 }
3444 }
3445
3446 if (hasBreak) {
3447 inlineMax += beginMax;
3448 if (m_maxWidth < inlineMax) {
3449 m_maxWidth = inlineMax;
3450 }
3451 if (m_maxWidth < childMax) {
3452 m_maxWidth = childMax;
3453 }
3454 inlineMax = endMax;
3455 } else {
3456 inlineMax += childMax;
3457 }
3458 }
3459
3460 // Ignore spaces after a list marker.
3461 if (child->isListMarker()) {
3462 stripFrontSpaces = true;
3463 }
3464 } else {
3465 if (m_minWidth < inlineMin) {
3466 m_minWidth = inlineMin;
3467 }
3468 if (m_maxWidth < inlineMax) {
3469 m_maxWidth = inlineMax;
3470 }
3471 inlineMin = inlineMax = 0;
3472 stripFrontSpaces = true;
3473 trailingSpaceChild = nullptr;
3474 }
3475
3476 oldAutoWrap = autoWrap;
3477 }
3478
3479 stripTrailingSpace(style()->preserveWS(), inlineMax, inlineMin, trailingSpaceChild);
3480
3481 if (m_minWidth < inlineMin) {
3482 m_minWidth = inlineMin;
3483 }
3484 if (m_maxWidth < inlineMax) {
3485 m_maxWidth = inlineMax;
3486 }
3487 // qCDebug(KHTML_LOG) << "m_minWidth=" << m_minWidth
3488 // << " m_maxWidth=" << m_maxWidth;
3489 }
3490
3491 // Use a very large value (in effect infinite).
3492 #define BLOCK_MAX_WIDTH 15000
3493
calcBlockMinMaxWidth()3494 void RenderBlock::calcBlockMinMaxWidth()
3495 {
3496 bool nowrap = !style()->autoWrap();
3497
3498 RenderObject *child = firstChild();
3499 int floatLeftWidth = 0, floatRightWidth = 0;
3500
3501 while (child != nullptr) {
3502 // positioned children don't affect the minmaxwidth
3503 if (child->isPositioned()) {
3504 child = child->nextSibling();
3505 continue;
3506 }
3507
3508 if (child->isFloating() || child->flowAroundFloats()) {
3509 int floatTotalWidth = floatLeftWidth + floatRightWidth;
3510 if (child->style()->clear() & CLEFT) {
3511 m_maxWidth = qMax(floatTotalWidth, m_maxWidth);
3512 floatLeftWidth = 0;
3513 }
3514 if (child->style()->clear() & CRIGHT) {
3515 m_maxWidth = qMax(floatTotalWidth, m_maxWidth);
3516 floatRightWidth = 0;
3517 }
3518 }
3519
3520 Length ml = child->style()->marginLeft();
3521 Length mr = child->style()->marginRight();
3522
3523 // Call calcWidth on the child to ensure that our margins are
3524 // up to date. This method can be called before the child has actually
3525 // calculated its margins (which are computed inside calcWidth).
3526 if (ml.isPercent() || mr.isPercent()) {
3527 calcWidth();
3528 }
3529
3530 // A margin basically has three types: fixed, percentage, and auto (variable).
3531 // Auto margins simply become 0 when computing min/max width.
3532 // Fixed margins can be added in as is.
3533 // Percentage margins are computed as a percentage of the width we calculated in
3534 // the calcWidth call above. In this case we use the actual cached margin values on
3535 // the RenderObject itself.
3536 int margin = 0, marginLeft = 0, marginRight = 0;
3537 if (ml.isFixed()) {
3538 marginLeft += ml.value();
3539 } else if (ml.isPercent()) {
3540 marginLeft += child->marginLeft();
3541 }
3542
3543 if (mr.isFixed()) {
3544 marginRight += mr.value();
3545 } else if (mr.isPercent()) {
3546 marginRight += child->marginRight();
3547 }
3548
3549 margin = marginLeft + marginRight;
3550
3551 int w = child->minWidth() + margin;
3552 if (m_minWidth < w) {
3553 m_minWidth = w;
3554 }
3555
3556 // IE ignores tables for calculation of nowrap. Makes some sense.
3557 if (nowrap && !child->isTable() && m_maxWidth < w) {
3558 m_maxWidth = w;
3559 }
3560
3561 w = child->maxWidth() + margin;
3562
3563 if (!child->isFloating()) {
3564 if (child->flowAroundFloats()) {
3565 // Determine a left and right max value based on whether or not the floats can fit in the
3566 // margins of the object. For negative margins, we will attempt to overlap the float if the negative margin
3567 // is smaller than the float width.
3568 int maxLeft = marginLeft > 0 ? qMax(floatLeftWidth, marginLeft) : floatLeftWidth + marginLeft;
3569 int maxRight = marginRight > 0 ? qMax(floatRightWidth, marginRight) : floatRightWidth + marginRight;
3570 w = child->maxWidth() + maxLeft + maxRight;
3571 w = qMax(w, floatLeftWidth + floatRightWidth);
3572 } else {
3573 m_maxWidth = qMax(floatLeftWidth + floatRightWidth, m_maxWidth);
3574 }
3575 floatLeftWidth = floatRightWidth = 0;
3576 }
3577
3578 if (child->isFloating()) {
3579 if (style()->floating() & FLEFT) {
3580 floatLeftWidth += w;
3581 } else {
3582 floatRightWidth += w;
3583 }
3584 } else if (m_maxWidth < w) {
3585 m_maxWidth = w;
3586 }
3587
3588 // A very specific WinIE quirk.
3589 // Example:
3590 /*
3591 <div style="position:absolute; width:100px; top:50px;">
3592 <div style="position:absolute;left:0px;top:50px;height:50px;background-color:green">
3593 <table style="width:100%"><tr><td></table>
3594 </div>
3595 </div>
3596 */
3597 // In the above example, the inner absolute positioned block should have a computed width
3598 // of 100px because of the table.
3599 // We can achieve this effect by making the maxwidth of blocks that contain tables
3600 // with percentage widths be infinite (as long as they are not inside a table cell).
3601 if (style()->htmlHacks() && child->style()->width().isPercent() &&
3602 !isTableCell() && child->isTable() && m_maxWidth < BLOCK_MAX_WIDTH) {
3603 RenderBlock *cb = containingBlock();
3604 while (!cb->isCanvas() && !cb->isTableCell()) {
3605 cb = cb->containingBlock();
3606 }
3607 if (!cb->isTableCell()) {
3608 m_maxWidth = BLOCK_MAX_WIDTH;
3609 }
3610 }
3611 child = child->nextSibling();
3612 }
3613 m_maxWidth = qMax(floatLeftWidth + floatRightWidth, m_maxWidth);
3614 }
3615
close()3616 void RenderBlock::close()
3617 {
3618 if (lastChild() && lastChild()->isAnonymousBlock()) {
3619 lastChild()->close();
3620 }
3621 updateFirstLetter();
3622 RenderFlow::close();
3623 }
3624
getBaselineOfFirstLineBox()3625 int RenderBlock::getBaselineOfFirstLineBox()
3626 {
3627 if (m_firstLineBox) {
3628 return m_firstLineBox->yPos() + m_firstLineBox->baseline();
3629 }
3630
3631 if (isInline()) {
3632 return -1; // We're inline and had no line box, so we have no baseline we can return.
3633 }
3634
3635 for (RenderObject *curr = firstChild(); curr; curr = curr->nextSibling()) {
3636 int result = curr->getBaselineOfFirstLineBox();
3637 if (result != -1) {
3638 return curr->yPos() + result; // Translate to our coordinate space.
3639 }
3640 }
3641
3642 return -1;
3643 }
3644
getFirstLineBox()3645 InlineFlowBox *RenderBlock::getFirstLineBox()
3646 {
3647 if (m_firstLineBox) {
3648 return m_firstLineBox;
3649 }
3650
3651 if (isInline()) {
3652 return nullptr; // We're inline and had no line box, so we have no baseline we can return.
3653 }
3654
3655 for (RenderObject *curr = firstChild(); curr; curr = curr->nextSibling()) {
3656 InlineFlowBox *result = curr->getFirstLineBox();
3657 if (result) {
3658 return result;
3659 }
3660 }
3661
3662 return nullptr;
3663 }
3664
inRootBlockContext() const3665 bool RenderBlock::inRootBlockContext() const
3666 {
3667 if (isTableCell() || isFloatingOrPositioned() || hasOverflowClip()) {
3668 return false;
3669 }
3670
3671 if (isRoot() || isCanvas()) {
3672 return true;
3673 }
3674
3675 return containingBlock()->inRootBlockContext();
3676 }
3677
renderName() const3678 const char *RenderBlock::renderName() const
3679 {
3680 if (isFloating()) {
3681 return "RenderBlock (floating)";
3682 }
3683 if (isPositioned()) {
3684 return "RenderBlock (positioned)";
3685 }
3686 if (isAnonymousBlock() && m_avoidPageBreak) {
3687 return "RenderBlock (avoidPageBreak)";
3688 }
3689 if (isAnonymousBlock()) {
3690 return "RenderBlock (anonymous)";
3691 } else if (isAnonymous()) {
3692 return "RenderBlock (generated)";
3693 }
3694 if (isRelPositioned()) {
3695 return "RenderBlock (relative positioned)";
3696 }
3697 if (style() && style()->display() == COMPACT) {
3698 return "RenderBlock (compact)";
3699 }
3700 if (style() && style()->display() == RUN_IN) {
3701 return "RenderBlock (run-in)";
3702 }
3703 return "RenderBlock";
3704 }
3705
3706 #ifdef ENABLE_DUMP
printTree(int indent) const3707 void RenderBlock::printTree(int indent) const
3708 {
3709 RenderFlow::printTree(indent);
3710
3711 if (m_floatingObjects) {
3712 QListIterator<FloatingObject *> it(*m_floatingObjects);
3713 FloatingObject *r;
3714 while (it.hasNext()) {
3715 r = it.next();
3716 QString s;
3717 s.fill(' ', indent);
3718 qCDebug(KHTML_LOG) << s << renderName() << ": " <<
3719 (r->type == FloatingObject::FloatLeft ? "FloatLeft" : "FloatRight") <<
3720 "[" << r->node->renderName() << ": " << (void *)r->node << "] (" << r->startY << " - " << r->endY << ")" << "width: " << r->width;
3721 }
3722 }
3723 }
3724
dump(QTextStream & stream,const QString & ind) const3725 void RenderBlock::dump(QTextStream &stream, const QString &ind) const
3726 {
3727 RenderFlow::dump(stream, ind);
3728
3729 if (m_childrenInline) {
3730 stream << QLatin1String(" childrenInline");
3731 }
3732 // FIXME: currently only print pre to not mess up regression
3733 if (style()->preserveWS()) {
3734 stream << " pre";
3735 }
3736 if (m_firstLine) {
3737 stream << QLatin1String(" firstLine");
3738 }
3739
3740 if (m_floatingObjects && !m_floatingObjects->isEmpty()) {
3741 stream << QLatin1String(" special(");
3742 QListIterator<FloatingObject *> it(*m_floatingObjects);
3743 FloatingObject *r;
3744 bool first = true;
3745 while (it.hasNext()) {
3746 r = it.next();
3747 if (!first) {
3748 stream << QLatin1Char(',');
3749 }
3750 stream << r->node->renderName();
3751 first = false;
3752 }
3753 stream << QLatin1Char(')');
3754 }
3755
3756 // ### EClear m_clearStatus
3757 }
3758 #endif
3759
3760 #undef DEBUG
3761 #undef DEBUG_LAYOUT
3762 #undef BOX_DEBUG
3763
3764 } // namespace khtml
3765
3766