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1 /* | |
2 * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved. | |
3 * | |
4 * Redistribution and use in source and binary forms, with or without | |
5 * modification, are permitted provided that the following conditions | |
6 * are met: | |
7 * | |
8 * 1. Redistributions of source code must retain the above | |
9 * copyright notice, this list of conditions and the following | |
10 * disclaimer. | |
11 * 2. Redistributions in binary form must reproduce the above | |
12 * copyright notice, this list of conditions and the following | |
13 * disclaimer in the documentation and/or other materials | |
14 * provided with the distribution. | |
15 * | |
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY | |
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE | |
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, | |
21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR | |
25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF | |
26 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 * SUCH DAMAGE. | |
28 */ | |
29 | |
30 #include "config.h" | |
31 | |
32 #include "core/rendering/RenderFlowThread.h" | |
33 | |
34 #include "core/dom/Node.h" | |
35 #include "core/rendering/FlowThreadController.h" | |
36 #include "core/rendering/HitTestRequest.h" | |
37 #include "core/rendering/HitTestResult.h" | |
38 #include "core/rendering/LayoutRectRecorder.h" | |
39 #include "core/rendering/PaintInfo.h" | |
40 #include "core/rendering/RenderBoxRegionInfo.h" | |
41 #include "core/rendering/RenderInline.h" | |
42 #include "core/rendering/RenderLayer.h" | |
43 #include "core/rendering/RenderRegion.h" | |
44 #include "core/rendering/RenderView.h" | |
45 #include "platform/PODIntervalTree.h" | |
46 #include "platform/geometry/TransformState.h" | |
47 | |
48 namespace WebCore { | |
49 | |
50 RenderFlowThread::RenderFlowThread() | |
51 : RenderBlockFlow(0) | |
52 , m_previousRegionCount(0) | |
53 , m_autoLogicalHeightRegionsCount(0) | |
54 , m_regionsInvalidated(false) | |
55 , m_regionsHaveUniformLogicalWidth(true) | |
56 , m_regionsHaveUniformLogicalHeight(true) | |
57 , m_hasRegionsWithStyling(false) | |
58 , m_dispatchRegionLayoutUpdateEvent(false) | |
59 , m_dispatchRegionOversetChangeEvent(false) | |
60 , m_pageLogicalSizeChanged(false) | |
61 , m_inConstrainedLayoutPhase(false) | |
62 , m_needsTwoPhasesLayout(false) | |
63 { | |
64 setFlowThreadState(InsideOutOfFlowThread); | |
65 } | |
66 | |
67 PassRefPtr<RenderStyle> RenderFlowThread::createFlowThreadStyle(RenderStyle* par
entStyle) | |
68 { | |
69 RefPtr<RenderStyle> newStyle(RenderStyle::create()); | |
70 newStyle->inheritFrom(parentStyle); | |
71 newStyle->setDisplay(BLOCK); | |
72 newStyle->setPosition(AbsolutePosition); | |
73 newStyle->setZIndex(0); | |
74 newStyle->setLeft(Length(0, Fixed)); | |
75 newStyle->setTop(Length(0, Fixed)); | |
76 newStyle->setWidth(Length(100, Percent)); | |
77 newStyle->setHeight(Length(100, Percent)); | |
78 newStyle->font().update(0); | |
79 | |
80 return newStyle.release(); | |
81 } | |
82 | |
83 void RenderFlowThread::styleDidChange(StyleDifference diff, const RenderStyle* o
ldStyle) | |
84 { | |
85 RenderBlock::styleDidChange(diff, oldStyle); | |
86 | |
87 if (oldStyle && oldStyle->writingMode() != style()->writingMode()) | |
88 invalidateRegions(); | |
89 } | |
90 | |
91 void RenderFlowThread::removeFlowChildInfo(RenderObject* child) | |
92 { | |
93 if (child->isBox()) | |
94 removeRenderBoxRegionInfo(toRenderBox(child)); | |
95 clearRenderObjectCustomStyle(child); | |
96 } | |
97 | |
98 void RenderFlowThread::addRegionToThread(RenderRegion* renderRegion) | |
99 { | |
100 ASSERT(renderRegion); | |
101 m_regionList.add(renderRegion); | |
102 renderRegion->setIsValid(true); | |
103 } | |
104 | |
105 void RenderFlowThread::removeRegionFromThread(RenderRegion* renderRegion) | |
106 { | |
107 ASSERT(renderRegion); | |
108 m_regionList.remove(renderRegion); | |
109 } | |
110 | |
111 void RenderFlowThread::invalidateRegions() | |
112 { | |
113 if (m_regionsInvalidated) { | |
114 ASSERT(selfNeedsLayout()); | |
115 return; | |
116 } | |
117 | |
118 m_regionRangeMap.clear(); | |
119 m_breakBeforeToRegionMap.clear(); | |
120 m_breakAfterToRegionMap.clear(); | |
121 setNeedsLayout(); | |
122 | |
123 m_regionsInvalidated = true; | |
124 } | |
125 | |
126 class CurrentRenderFlowThreadDisabler { | |
127 WTF_MAKE_NONCOPYABLE(CurrentRenderFlowThreadDisabler); | |
128 public: | |
129 CurrentRenderFlowThreadDisabler(RenderView* view) | |
130 : m_view(view) | |
131 , m_renderFlowThread(0) | |
132 { | |
133 m_renderFlowThread = m_view->flowThreadController()->currentRenderFlowTh
read(); | |
134 if (m_renderFlowThread) | |
135 view->flowThreadController()->setCurrentRenderFlowThread(0); | |
136 } | |
137 ~CurrentRenderFlowThreadDisabler() | |
138 { | |
139 if (m_renderFlowThread) | |
140 m_view->flowThreadController()->setCurrentRenderFlowThread(m_renderF
lowThread); | |
141 } | |
142 private: | |
143 RenderView* m_view; | |
144 RenderFlowThread* m_renderFlowThread; | |
145 }; | |
146 | |
147 void RenderFlowThread::validateRegions() | |
148 { | |
149 if (m_regionsInvalidated) { | |
150 m_regionsInvalidated = false; | |
151 m_regionsHaveUniformLogicalWidth = true; | |
152 m_regionsHaveUniformLogicalHeight = true; | |
153 | |
154 if (hasRegions()) { | |
155 LayoutUnit previousRegionLogicalWidth = 0; | |
156 LayoutUnit previousRegionLogicalHeight = 0; | |
157 bool firstRegionVisited = false; | |
158 | |
159 for (RenderRegionList::iterator iter = m_regionList.begin(); iter !=
m_regionList.end(); ++iter) { | |
160 RenderRegion* region = *iter; | |
161 ASSERT(!region->needsLayout() || region->isRenderRegionSet()); | |
162 | |
163 region->deleteAllRenderBoxRegionInfo(); | |
164 | |
165 // In the normal layout phase we need to initialize the computed
AutoHeight for auto-height regions. | |
166 // See initializeRegionsComputedAutoHeight for the explanation. | |
167 // Also, if we have auto-height regions we can't assume m_region
sHaveUniformLogicalHeight to be true in the first phase | |
168 // because the auto-height regions don't have their height compu
ted yet. | |
169 if (!inConstrainedLayoutPhase() && region->hasAutoLogicalHeight(
)) { | |
170 region->setComputedAutoHeight(region->maxPageLogicalHeight()
); | |
171 m_regionsHaveUniformLogicalHeight = false; | |
172 } | |
173 | |
174 LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); | |
175 LayoutUnit regionLogicalHeight = region->pageLogicalHeight(); | |
176 | |
177 if (!firstRegionVisited) { | |
178 firstRegionVisited = true; | |
179 } else { | |
180 if (m_regionsHaveUniformLogicalWidth && previousRegionLogica
lWidth != regionLogicalWidth) | |
181 m_regionsHaveUniformLogicalWidth = false; | |
182 if (m_regionsHaveUniformLogicalHeight && previousRegionLogic
alHeight != regionLogicalHeight) | |
183 m_regionsHaveUniformLogicalHeight = false; | |
184 } | |
185 | |
186 previousRegionLogicalWidth = regionLogicalWidth; | |
187 } | |
188 } | |
189 } | |
190 | |
191 updateLogicalWidth(); // Called to get the maximum logical width for the reg
ion. | |
192 updateRegionsFlowThreadPortionRect(); | |
193 } | |
194 | |
195 void RenderFlowThread::layout() | |
196 { | |
197 LayoutRectRecorder recorder(*this); | |
198 m_pageLogicalSizeChanged = m_regionsInvalidated && everHadLayout(); | |
199 | |
200 // In case this is the second pass of the normal phase we need to update the
auto-height regions to their initial value. | |
201 // If the region chain was invalidated this will happen anyway. | |
202 if (!m_regionsInvalidated && !inConstrainedLayoutPhase()) | |
203 initializeRegionsComputedAutoHeight(); | |
204 | |
205 validateRegions(); | |
206 | |
207 // This is the first phase of the layout and because we have auto-height reg
ions we'll need a second | |
208 // pass to update the flow with the computed auto-height regions. | |
209 m_needsTwoPhasesLayout = !inConstrainedLayoutPhase() && hasAutoLogicalHeight
Regions(); | |
210 | |
211 CurrentRenderFlowThreadMaintainer currentFlowThreadSetter(this); | |
212 RenderBlockFlow::layout(); | |
213 | |
214 m_pageLogicalSizeChanged = false; | |
215 | |
216 if (lastRegion()) | |
217 lastRegion()->expandToEncompassFlowThreadContentsIfNeeded(); | |
218 | |
219 if (shouldDispatchRegionLayoutUpdateEvent()) | |
220 dispatchRegionLayoutUpdateEvent(); | |
221 | |
222 if (shouldDispatchRegionOversetChangeEvent()) | |
223 dispatchRegionOversetChangeEvent(); | |
224 } | |
225 | |
226 void RenderFlowThread::updateLogicalWidth() | |
227 { | |
228 LayoutUnit logicalWidth = initialLogicalWidth(); | |
229 for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regio
nList.end(); ++iter) { | |
230 RenderRegion* region = *iter; | |
231 ASSERT(!region->needsLayout() || region->isRenderRegionSet()); | |
232 logicalWidth = max(region->pageLogicalWidth(), logicalWidth); | |
233 } | |
234 setLogicalWidth(logicalWidth); | |
235 | |
236 // If the regions have non-uniform logical widths, then insert inset informa
tion for the RenderFlowThread. | |
237 for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regio
nList.end(); ++iter) { | |
238 RenderRegion* region = *iter; | |
239 LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); | |
240 if (regionLogicalWidth != logicalWidth) { | |
241 LayoutUnit logicalLeft = style()->direction() == LTR ? LayoutUnit()
: logicalWidth - regionLogicalWidth; | |
242 region->setRenderBoxRegionInfo(this, logicalLeft, regionLogicalWidth
, false); | |
243 } | |
244 } | |
245 } | |
246 | |
247 void RenderFlowThread::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, L
ogicalExtentComputedValues& computedValues) const | |
248 { | |
249 computedValues.m_position = logicalTop; | |
250 computedValues.m_extent = 0; | |
251 | |
252 for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m
_regionList.end(); ++iter) { | |
253 RenderRegion* region = *iter; | |
254 ASSERT(!region->needsLayout() || region->isRenderRegionSet()); | |
255 | |
256 computedValues.m_extent += region->logicalHeightOfAllFlowThreadContent()
; | |
257 } | |
258 } | |
259 | |
260 LayoutRect RenderFlowThread::computeRegionClippingRect(const LayoutPoint& offset
, const LayoutRect& flowThreadPortionRect, const LayoutRect& flowThreadPortionOv
erflowRect) const | |
261 { | |
262 LayoutRect regionClippingRect(offset + (flowThreadPortionOverflowRect.locati
on() - flowThreadPortionRect.location()), flowThreadPortionOverflowRect.size()); | |
263 if (style()->isFlippedBlocksWritingMode()) | |
264 regionClippingRect.move(flowThreadPortionRect.size() - flowThreadPortion
OverflowRect.size()); | |
265 return regionClippingRect; | |
266 } | |
267 | |
268 void RenderFlowThread::paintFlowThreadPortionInRegion(PaintInfo& paintInfo, Rend
erRegion* region, const LayoutRect& flowThreadPortionRect, const LayoutRect& flo
wThreadPortionOverflowRect, const LayoutPoint& paintOffset) const | |
269 { | |
270 GraphicsContext* context = paintInfo.context; | |
271 if (!context) | |
272 return; | |
273 | |
274 // RenderFlowThread should start painting its content in a position that is
offset | |
275 // from the region rect's current position. The amount of offset is equal to
the location of | |
276 // the flow thread portion in the flow thread's local coordinates. | |
277 // Note that we have to pixel snap the location at which we're going to pain
t, since this is necessary | |
278 // to minimize the amount of incorrect snapping that would otherwise occur. | |
279 // If we tried to paint by applying a non-integral translation, then all the | |
280 // layout code that attempted to pixel snap would be incorrect. | |
281 IntPoint adjustedPaintOffset; | |
282 LayoutPoint portionLocation; | |
283 if (style()->isFlippedBlocksWritingMode()) { | |
284 LayoutRect flippedFlowThreadPortionRect(flowThreadPortionRect); | |
285 flipForWritingMode(flippedFlowThreadPortionRect); | |
286 portionLocation = flippedFlowThreadPortionRect.location(); | |
287 } else { | |
288 portionLocation = flowThreadPortionRect.location(); | |
289 } | |
290 adjustedPaintOffset = roundedIntPoint(paintOffset - portionLocation); | |
291 | |
292 // The clipping rect for the region is set up by assuming the flowThreadPort
ionRect is going to paint offset from adjustedPaintOffset. | |
293 // Remember that we pixel snapped and moved the paintOffset and stored the s
napped result in adjustedPaintOffset. Now we add back in | |
294 // the flowThreadPortionRect's location to get the spot where we expect the
portion to actually paint. This can be non-integral and | |
295 // that's ok. We then pixel snap the resulting clipping rect to account for
snapping that will occur when the flow thread paints. | |
296 IntRect regionClippingRect = pixelSnappedIntRect(computeRegionClippingRect(a
djustedPaintOffset + portionLocation, flowThreadPortionRect, flowThreadPortionOv
erflowRect)); | |
297 | |
298 PaintInfo info(paintInfo); | |
299 info.rect.intersect(regionClippingRect); | |
300 | |
301 if (!info.rect.isEmpty()) { | |
302 context->save(); | |
303 | |
304 context->clip(regionClippingRect); | |
305 | |
306 context->translate(adjustedPaintOffset.x(), adjustedPaintOffset.y()); | |
307 info.rect.moveBy(-adjustedPaintOffset); | |
308 | |
309 if (info.phase == PaintPhaseTextClip) | |
310 info.paintBehavior = PaintBehaviorForceBlackText; | |
311 | |
312 layer()->paint(context, info.rect, info.paintBehavior, 0, region, PaintL
ayerTemporaryClipRects); | |
313 | |
314 context->restore(); | |
315 } | |
316 } | |
317 | |
318 bool RenderFlowThread::nodeAtPoint(const HitTestRequest& request, HitTestResult&
result, const HitTestLocation& locationInContainer, const LayoutPoint& accumula
tedOffset, HitTestAction hitTestAction) | |
319 { | |
320 if (hitTestAction == HitTestBlockBackground) | |
321 return false; | |
322 return RenderBlock::nodeAtPoint(request, result, locationInContainer, accumu
latedOffset, hitTestAction); | |
323 } | |
324 | |
325 bool RenderFlowThread::hitTestFlowThreadPortionInRegion(RenderRegion* region, co
nst LayoutRect& flowThreadPortionRect, const LayoutRect& flowThreadPortionOverfl
owRect, const HitTestRequest& request, HitTestResult& result, const HitTestLocat
ion& locationInContainer, const LayoutPoint& accumulatedOffset) const | |
326 { | |
327 LayoutRect regionClippingRect = computeRegionClippingRect(accumulatedOffset,
flowThreadPortionRect, flowThreadPortionOverflowRect); | |
328 if (!regionClippingRect.contains(locationInContainer.point())) | |
329 return false; | |
330 | |
331 LayoutSize renderFlowThreadOffset; | |
332 if (style()->isFlippedBlocksWritingMode()) { | |
333 LayoutRect flippedFlowThreadPortionRect(flowThreadPortionRect); | |
334 flipForWritingMode(flippedFlowThreadPortionRect); | |
335 renderFlowThreadOffset = accumulatedOffset - flippedFlowThreadPortionRec
t.location(); | |
336 } else { | |
337 renderFlowThreadOffset = accumulatedOffset - flowThreadPortionRect.locat
ion(); | |
338 } | |
339 | |
340 // Always ignore clipping, since the RenderFlowThread has nothing to do with
the bounds of the FrameView. | |
341 HitTestRequest newRequest(request.type() | HitTestRequest::IgnoreClipping |
HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent); | |
342 | |
343 // Make a new temporary HitTestLocation in the new region. | |
344 HitTestLocation newHitTestLocation(locationInContainer, -renderFlowThreadOff
set, region); | |
345 | |
346 bool isPointInsideFlowThread = layer()->hitTest(newRequest, newHitTestLocati
on, result); | |
347 | |
348 // FIXME: Should we set result.m_localPoint back to the RenderRegion's coord
inate space or leave it in the RenderFlowThread's coordinate | |
349 // space? Right now it's staying in the RenderFlowThread's coordinate space,
which may end up being ok. We will know more when we get around to | |
350 // patching positionForPoint. | |
351 return isPointInsideFlowThread; | |
352 } | |
353 | |
354 bool RenderFlowThread::shouldRepaint(const LayoutRect& r) const | |
355 { | |
356 if (view()->document().printing() || r.isEmpty()) | |
357 return false; | |
358 | |
359 return true; | |
360 } | |
361 | |
362 void RenderFlowThread::repaintRectangleInRegions(const LayoutRect& repaintRect)
const | |
363 { | |
364 if (!shouldRepaint(repaintRect) || !hasValidRegionInfo()) | |
365 return; | |
366 | |
367 LayoutStateDisabler layoutStateDisabler(view()); // We can't use layout stat
e to repaint, since the regions are somewhere else. | |
368 | |
369 // We can't use currentFlowThread as it is possible to have interleaved flow
threads and the wrong one could be used. | |
370 // Let each region figure out the proper enclosing flow thread. | |
371 CurrentRenderFlowThreadDisabler disabler(view()); | |
372 | |
373 for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m
_regionList.end(); ++iter) { | |
374 RenderRegion* region = *iter; | |
375 | |
376 region->repaintFlowThreadContent(repaintRect); | |
377 } | |
378 } | |
379 | |
380 RenderRegion* RenderFlowThread::regionAtBlockOffset(LayoutUnit offset, bool exte
ndLastRegion, RegionAutoGenerationPolicy autoGenerationPolicy) | |
381 { | |
382 ASSERT(!m_regionsInvalidated); | |
383 | |
384 if (autoGenerationPolicy == AllowRegionAutoGeneration) | |
385 autoGenerateRegionsToBlockOffset(offset); | |
386 | |
387 if (offset <= 0) | |
388 return m_regionList.isEmpty() ? 0 : m_regionList.first(); | |
389 | |
390 RegionSearchAdapter adapter(offset); | |
391 m_regionIntervalTree.allOverlapsWithAdapter<RegionSearchAdapter>(adapter); | |
392 | |
393 // If no region was found, the offset is in the flow thread overflow. | |
394 // The last region will contain the offset if extendLastRegion is set or if
the last region is a set. | |
395 if (!adapter.result() && !m_regionList.isEmpty() && (extendLastRegion || m_r
egionList.last()->isRenderRegionSet())) | |
396 return m_regionList.last(); | |
397 | |
398 return adapter.result(); | |
399 } | |
400 | |
401 RenderRegion* RenderFlowThread::regionFromAbsolutePointAndBox(IntPoint absoluteP
oint, const RenderBox* flowedBox) | |
402 { | |
403 if (!flowedBox) | |
404 return 0; | |
405 | |
406 RenderRegion* startRegion = 0; | |
407 RenderRegion* endRegion = 0; | |
408 getRegionRangeForBox(flowedBox, startRegion, endRegion); | |
409 | |
410 if (!startRegion) | |
411 return 0; | |
412 | |
413 for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter
!= m_regionList.end(); ++iter) { | |
414 RenderRegion* region = *iter; | |
415 IntRect regionAbsoluteRect(roundedIntPoint(region->localToAbsolute()), r
oundedIntSize(region->frameRect().size())); | |
416 if (regionAbsoluteRect.contains(absolutePoint)) | |
417 return region; | |
418 | |
419 if (region == endRegion) | |
420 break; | |
421 } | |
422 | |
423 return 0; | |
424 } | |
425 | |
426 LayoutPoint RenderFlowThread::adjustedPositionRelativeToOffsetParent(const Rende
rBoxModelObject& boxModelObject, const LayoutPoint& startPoint) | |
427 { | |
428 LayoutPoint referencePoint = startPoint; | |
429 | |
430 // FIXME: This needs to be adapted for different writing modes inside the fl
ow thread. | |
431 RenderRegion* startRegion = regionAtBlockOffset(referencePoint.y()); | |
432 if (startRegion) { | |
433 RenderBoxModelObject* startRegionBox = startRegion->isRenderNamedFlowFra
gment() ? toRenderBoxModelObject(startRegion->parent()) : startRegion; | |
434 // Take into account the offset coordinates of the region. | |
435 RenderObject* currObject = startRegionBox; | |
436 RenderObject* currOffsetParentRenderer; | |
437 Element* currOffsetParentElement; | |
438 while ((currOffsetParentElement = currObject->offsetParent()) && (currOf
fsetParentRenderer = currOffsetParentElement->renderer())) { | |
439 if (currObject->isBoxModelObject()) | |
440 referencePoint.move(toRenderBoxModelObject(currObject)->offsetLe
ft(), toRenderBoxModelObject(currObject)->offsetTop()); | |
441 | |
442 // Since we're looking for the offset relative to the body, we must
also | |
443 // take into consideration the borders of the region's offsetParent. | |
444 if (currOffsetParentRenderer->isBox() && !currOffsetParentRenderer->
isBody()) | |
445 referencePoint.move(toRenderBox(currOffsetParentRenderer)->borde
rLeft(), toRenderBox(currOffsetParentRenderer)->borderTop()); | |
446 | |
447 currObject = currOffsetParentRenderer; | |
448 } | |
449 | |
450 // We need to check if any of this box's containing blocks start in a di
fferent region | |
451 // and if so, drop the object's top position (which was computed relativ
e to its containing block | |
452 // and is no longer valid) and recompute it using the region in which it
flows as reference. | |
453 bool wasComputedRelativeToOtherRegion = false; | |
454 const RenderBlock* objContainingBlock = boxModelObject.containingBlock()
; | |
455 while (objContainingBlock && !objContainingBlock->isRenderNamedFlowThrea
d()) { | |
456 // Check if this object is in a different region. | |
457 RenderRegion* parentStartRegion = 0; | |
458 RenderRegion* parentEndRegion = 0; | |
459 getRegionRangeForBox(objContainingBlock, parentStartRegion, parentEn
dRegion); | |
460 if (parentStartRegion && parentStartRegion != startRegion) { | |
461 wasComputedRelativeToOtherRegion = true; | |
462 break; | |
463 } | |
464 objContainingBlock = objContainingBlock->containingBlock(); | |
465 } | |
466 | |
467 if (wasComputedRelativeToOtherRegion) { | |
468 if (boxModelObject.isBox()) { | |
469 // Use borderBoxRectInRegion to account for variations such as p
ercentage margins. | |
470 LayoutRect borderBoxRect = toRenderBox(&boxModelObject)->borderB
oxRectInRegion(startRegion, RenderBox::DoNotCacheRenderBoxRegionInfo); | |
471 referencePoint.move(borderBoxRect.location().x(), 0); | |
472 } | |
473 | |
474 // Get the logical top coordinate of the current object. | |
475 LayoutUnit top = 0; | |
476 if (boxModelObject.isRenderBlock()) { | |
477 top = toRenderBlock(&boxModelObject)->offsetFromLogicalTopOfFirs
tPage(); | |
478 } else { | |
479 if (boxModelObject.containingBlock()) | |
480 top = boxModelObject.containingBlock()->offsetFromLogicalTop
OfFirstPage(); | |
481 | |
482 if (boxModelObject.isBox()) | |
483 top += toRenderBox(&boxModelObject)->topLeftLocation().y(); | |
484 else if (boxModelObject.isRenderInline()) | |
485 top -= toRenderInline(&boxModelObject)->borderTop(); | |
486 } | |
487 | |
488 // Get the logical top of the region this object starts in | |
489 // and compute the object's top, relative to the region's top. | |
490 LayoutUnit regionLogicalTop = startRegion->pageLogicalTopForOffset(t
op); | |
491 LayoutUnit topRelativeToRegion = top - regionLogicalTop; | |
492 referencePoint.setY(startRegionBox->offsetTop() + topRelativeToRegio
n); | |
493 | |
494 // Since the top has been overriden, check if the | |
495 // relative/sticky positioning must be reconsidered. | |
496 if (boxModelObject.isRelPositioned()) | |
497 referencePoint.move(0, boxModelObject.relativePositionOffset().h
eight()); | |
498 else if (boxModelObject.isStickyPositioned()) | |
499 referencePoint.move(0, boxModelObject.stickyPositionOffset().hei
ght()); | |
500 } | |
501 | |
502 // Since we're looking for the offset relative to the body, we must also | |
503 // take into consideration the borders of the region. | |
504 referencePoint.move(startRegionBox->borderLeft(), startRegionBox->border
Top()); | |
505 } | |
506 | |
507 return referencePoint; | |
508 } | |
509 | |
510 LayoutUnit RenderFlowThread::pageLogicalTopForOffset(LayoutUnit offset) | |
511 { | |
512 RenderRegion* region = regionAtBlockOffset(offset); | |
513 return region ? region->pageLogicalTopForOffset(offset) : LayoutUnit(); | |
514 } | |
515 | |
516 LayoutUnit RenderFlowThread::pageLogicalWidthForOffset(LayoutUnit offset) | |
517 { | |
518 RenderRegion* region = regionAtBlockOffset(offset, true); | |
519 return region ? region->pageLogicalWidth() : contentLogicalWidth(); | |
520 } | |
521 | |
522 LayoutUnit RenderFlowThread::pageLogicalHeightForOffset(LayoutUnit offset) | |
523 { | |
524 RenderRegion* region = regionAtBlockOffset(offset); | |
525 if (!region) | |
526 return 0; | |
527 | |
528 return region->pageLogicalHeight(); | |
529 } | |
530 | |
531 LayoutUnit RenderFlowThread::pageRemainingLogicalHeightForOffset(LayoutUnit offs
et, PageBoundaryRule pageBoundaryRule) | |
532 { | |
533 RenderRegion* region = regionAtBlockOffset(offset); | |
534 if (!region) | |
535 return 0; | |
536 | |
537 LayoutUnit pageLogicalTop = region->pageLogicalTopForOffset(offset); | |
538 LayoutUnit pageLogicalHeight = region->pageLogicalHeight(); | |
539 LayoutUnit pageLogicalBottom = pageLogicalTop + pageLogicalHeight; | |
540 LayoutUnit remainingHeight = pageLogicalBottom - offset; | |
541 if (pageBoundaryRule == IncludePageBoundary) { | |
542 // If IncludePageBoundary is set, the line exactly on the top edge of a | |
543 // region will act as being part of the previous region. | |
544 remainingHeight = intMod(remainingHeight, pageLogicalHeight); | |
545 } | |
546 return remainingHeight; | |
547 } | |
548 | |
549 RenderRegion* RenderFlowThread::mapFromFlowToRegion(TransformState& transformSta
te) const | |
550 { | |
551 if (!hasValidRegionInfo()) | |
552 return 0; | |
553 | |
554 LayoutRect boxRect = transformState.mappedQuad().enclosingBoundingBox(); | |
555 flipForWritingMode(boxRect); | |
556 | |
557 // FIXME: We need to refactor RenderObject::absoluteQuads to be able to spli
t the quads across regions, | |
558 // for now we just take the center of the mapped enclosing box and map it to
a region. | |
559 // Note: Using the center in order to avoid rounding errors. | |
560 | |
561 LayoutPoint center = boxRect.center(); | |
562 RenderRegion* renderRegion = const_cast<RenderFlowThread*>(this)->regionAtBl
ockOffset(isHorizontalWritingMode() ? center.y() : center.x(), true, DisallowReg
ionAutoGeneration); | |
563 if (!renderRegion) | |
564 return 0; | |
565 | |
566 LayoutRect flippedRegionRect(renderRegion->flowThreadPortionRect()); | |
567 flipForWritingMode(flippedRegionRect); | |
568 | |
569 transformState.move(renderRegion->contentBoxRect().location() - flippedRegio
nRect.location()); | |
570 | |
571 return renderRegion; | |
572 } | |
573 | |
574 void RenderFlowThread::removeRenderBoxRegionInfo(RenderBox* box) | |
575 { | |
576 if (!hasRegions()) | |
577 return; | |
578 | |
579 // If the region chain was invalidated the next layout will clear the box in
formation from all the regions. | |
580 if (m_regionsInvalidated) { | |
581 ASSERT(selfNeedsLayout()); | |
582 return; | |
583 } | |
584 | |
585 RenderRegion* startRegion; | |
586 RenderRegion* endRegion; | |
587 getRegionRangeForBox(box, startRegion, endRegion); | |
588 | |
589 for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter
!= m_regionList.end(); ++iter) { | |
590 RenderRegion* region = *iter; | |
591 region->removeRenderBoxRegionInfo(box); | |
592 if (region == endRegion) | |
593 break; | |
594 } | |
595 | |
596 #ifndef NDEBUG | |
597 // We have to make sure we did not leave any RenderBoxRegionInfo attached. | |
598 for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regio
nList.end(); ++iter) { | |
599 RenderRegion* region = *iter; | |
600 ASSERT(!region->renderBoxRegionInfo(box)); | |
601 } | |
602 #endif | |
603 | |
604 m_regionRangeMap.remove(box); | |
605 } | |
606 | |
607 bool RenderFlowThread::logicalWidthChangedInRegionsForBlock(const RenderBlock* b
lock) | |
608 { | |
609 if (!hasRegions()) | |
610 return false; | |
611 | |
612 RenderRegion* startRegion; | |
613 RenderRegion* endRegion; | |
614 getRegionRangeForBox(block, startRegion, endRegion); | |
615 | |
616 // When the region chain is invalidated the box information is discarded so
we must assume the width has changed. | |
617 if (m_pageLogicalSizeChanged && !startRegion) | |
618 return true; | |
619 | |
620 // Not necessary for the flow thread, since we already computed the correct
info for it. | |
621 if (block == this) | |
622 return false; | |
623 | |
624 for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter
!= m_regionList.end(); ++iter) { | |
625 RenderRegion* region = *iter; | |
626 ASSERT(!region->needsLayout() || region->isRenderRegionSet()); | |
627 | |
628 OwnPtr<RenderBoxRegionInfo> oldInfo = region->takeRenderBoxRegionInfo(bl
ock); | |
629 if (!oldInfo) | |
630 continue; | |
631 | |
632 LayoutUnit oldLogicalWidth = oldInfo->logicalWidth(); | |
633 RenderBoxRegionInfo* newInfo = block->renderBoxRegionInfo(region); | |
634 if (!newInfo || newInfo->logicalWidth() != oldLogicalWidth) | |
635 return true; | |
636 | |
637 if (region == endRegion) | |
638 break; | |
639 } | |
640 | |
641 return false; | |
642 } | |
643 | |
644 LayoutUnit RenderFlowThread::contentLogicalWidthOfFirstRegion() const | |
645 { | |
646 RenderRegion* firstValidRegionInFlow = firstRegion(); | |
647 if (!firstValidRegionInFlow) | |
648 return 0; | |
649 return isHorizontalWritingMode() ? firstValidRegionInFlow->contentWidth() :
firstValidRegionInFlow->contentHeight(); | |
650 } | |
651 | |
652 LayoutUnit RenderFlowThread::contentLogicalHeightOfFirstRegion() const | |
653 { | |
654 RenderRegion* firstValidRegionInFlow = firstRegion(); | |
655 if (!firstValidRegionInFlow) | |
656 return 0; | |
657 return isHorizontalWritingMode() ? firstValidRegionInFlow->contentHeight() :
firstValidRegionInFlow->contentWidth(); | |
658 } | |
659 | |
660 LayoutUnit RenderFlowThread::contentLogicalLeftOfFirstRegion() const | |
661 { | |
662 RenderRegion* firstValidRegionInFlow = firstRegion(); | |
663 if (!firstValidRegionInFlow) | |
664 return 0; | |
665 return isHorizontalWritingMode() ? firstValidRegionInFlow->flowThreadPortion
Rect().x() : firstValidRegionInFlow->flowThreadPortionRect().y(); | |
666 } | |
667 | |
668 RenderRegion* RenderFlowThread::firstRegion() const | |
669 { | |
670 if (!hasValidRegionInfo()) | |
671 return 0; | |
672 return m_regionList.first(); | |
673 } | |
674 | |
675 RenderRegion* RenderFlowThread::lastRegion() const | |
676 { | |
677 if (!hasValidRegionInfo()) | |
678 return 0; | |
679 return m_regionList.last(); | |
680 } | |
681 | |
682 void RenderFlowThread::clearRenderObjectCustomStyle(const RenderObject* object, | |
683 const RenderRegion* oldStartRegion, const RenderRegion* oldEndRegion, | |
684 const RenderRegion* newStartRegion, const RenderRegion* newEndRegion) | |
685 { | |
686 // Clear the styles for the object in the regions. | |
687 // The styles are not cleared for the regions that are contained in both ran
ges. | |
688 bool insideOldRegionRange = false; | |
689 bool insideNewRegionRange = false; | |
690 for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regio
nList.end(); ++iter) { | |
691 RenderRegion* region = *iter; | |
692 | |
693 if (oldStartRegion == region) | |
694 insideOldRegionRange = true; | |
695 if (newStartRegion == region) | |
696 insideNewRegionRange = true; | |
697 | |
698 if (!(insideOldRegionRange && insideNewRegionRange)) | |
699 region->clearObjectStyleInRegion(object); | |
700 | |
701 if (oldEndRegion == region) | |
702 insideOldRegionRange = false; | |
703 if (newEndRegion == region) | |
704 insideNewRegionRange = false; | |
705 } | |
706 } | |
707 | |
708 void RenderFlowThread::setRegionRangeForBox(const RenderBox* box, LayoutUnit off
setFromLogicalTopOfFirstPage) | |
709 { | |
710 if (!hasRegions()) | |
711 return; | |
712 | |
713 // FIXME: Not right for differing writing-modes. | |
714 RenderRegion* startRegion = regionAtBlockOffset(offsetFromLogicalTopOfFirstP
age, true); | |
715 RenderRegion* endRegion = regionAtBlockOffset(offsetFromLogicalTopOfFirstPag
e + box->logicalHeight(), true); | |
716 RenderRegionRangeMap::iterator it = m_regionRangeMap.find(box); | |
717 if (it == m_regionRangeMap.end()) { | |
718 m_regionRangeMap.set(box, RenderRegionRange(startRegion, endRegion)); | |
719 clearRenderObjectCustomStyle(box); | |
720 return; | |
721 } | |
722 | |
723 // If nothing changed, just bail. | |
724 RenderRegionRange& range = it->value; | |
725 if (range.startRegion() == startRegion && range.endRegion() == endRegion) | |
726 return; | |
727 | |
728 // Delete any info that we find before our new startRegion and after our new
endRegion. | |
729 for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regio
nList.end(); ++iter) { | |
730 RenderRegion* region = *iter; | |
731 if (region == startRegion) { | |
732 iter = m_regionList.find(endRegion); | |
733 continue; | |
734 } | |
735 | |
736 region->removeRenderBoxRegionInfo(box); | |
737 | |
738 if (region == range.endRegion()) | |
739 break; | |
740 } | |
741 | |
742 clearRenderObjectCustomStyle(box, range.startRegion(), range.endRegion(), st
artRegion, endRegion); | |
743 range.setRange(startRegion, endRegion); | |
744 } | |
745 | |
746 void RenderFlowThread::getRegionRangeForBox(const RenderBox* box, RenderRegion*&
startRegion, RenderRegion*& endRegion) const | |
747 { | |
748 startRegion = 0; | |
749 endRegion = 0; | |
750 RenderRegionRangeMap::const_iterator it = m_regionRangeMap.find(box); | |
751 if (it == m_regionRangeMap.end()) | |
752 return; | |
753 | |
754 const RenderRegionRange& range = it->value; | |
755 startRegion = range.startRegion(); | |
756 endRegion = range.endRegion(); | |
757 ASSERT(m_regionList.contains(startRegion) && m_regionList.contains(endRegion
)); | |
758 } | |
759 | |
760 void RenderFlowThread::applyBreakAfterContent(LayoutUnit clientHeight) | |
761 { | |
762 // Simulate a region break at height. If it points inside an auto logical he
ight region, | |
763 // then it may determine the region computed autoheight. | |
764 addForcedRegionBreak(clientHeight, this, false); | |
765 } | |
766 | |
767 bool RenderFlowThread::regionInRange(const RenderRegion* targetRegion, const Ren
derRegion* startRegion, const RenderRegion* endRegion) const | |
768 { | |
769 ASSERT(targetRegion); | |
770 | |
771 for (RenderRegionList::const_iterator it = m_regionList.find(const_cast<Rend
erRegion*>(startRegion)); it != m_regionList.end(); ++it) { | |
772 const RenderRegion* currRegion = *it; | |
773 if (targetRegion == currRegion) | |
774 return true; | |
775 if (currRegion == endRegion) | |
776 break; | |
777 } | |
778 | |
779 return false; | |
780 } | |
781 | |
782 // Check if the content is flown into at least a region with region styling rule
s. | |
783 void RenderFlowThread::checkRegionsWithStyling() | |
784 { | |
785 bool hasRegionsWithStyling = false; | |
786 for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regio
nList.end(); ++iter) { | |
787 RenderRegion* region = *iter; | |
788 if (region->hasCustomRegionStyle()) { | |
789 hasRegionsWithStyling = true; | |
790 break; | |
791 } | |
792 } | |
793 m_hasRegionsWithStyling = hasRegionsWithStyling; | |
794 } | |
795 | |
796 bool RenderFlowThread::objectInFlowRegion(const RenderObject* object, const Rend
erRegion* region) const | |
797 { | |
798 ASSERT(object); | |
799 ASSERT(region); | |
800 | |
801 RenderFlowThread* flowThread = object->flowThreadContainingBlock(); | |
802 if (flowThread != this) | |
803 return false; | |
804 if (!m_regionList.contains(const_cast<RenderRegion*>(region))) | |
805 return false; | |
806 | |
807 RenderBox* enclosingBox = object->enclosingBox(); | |
808 RenderRegion* enclosingBoxStartRegion = 0; | |
809 RenderRegion* enclosingBoxEndRegion = 0; | |
810 getRegionRangeForBox(enclosingBox, enclosingBoxStartRegion, enclosingBoxEndR
egion); | |
811 if (!regionInRange(region, enclosingBoxStartRegion, enclosingBoxEndRegion)) | |
812 return false; | |
813 | |
814 if (object->isBox()) | |
815 return true; | |
816 | |
817 LayoutRect objectABBRect = object->absoluteBoundingBoxRect(true); | |
818 if (!objectABBRect.width()) | |
819 objectABBRect.setWidth(1); | |
820 if (!objectABBRect.height()) | |
821 objectABBRect.setHeight(1); | |
822 if (objectABBRect.intersects(region->absoluteBoundingBoxRect(true))) | |
823 return true; | |
824 | |
825 if (region == lastRegion()) { | |
826 // If the object does not intersect any of the enclosing box regions | |
827 // then the object is in last region. | |
828 for (RenderRegionList::const_iterator it = m_regionList.find(enclosingBo
xStartRegion); it != m_regionList.end(); ++it) { | |
829 const RenderRegion* currRegion = *it; | |
830 if (currRegion == region) | |
831 break; | |
832 if (objectABBRect.intersects(currRegion->absoluteBoundingBoxRect(tru
e))) | |
833 return false; | |
834 } | |
835 return true; | |
836 } | |
837 | |
838 return false; | |
839 } | |
840 | |
841 #ifndef NDEBUG | |
842 bool RenderFlowThread::isAutoLogicalHeightRegionsCountConsistent() const | |
843 { | |
844 unsigned autoLogicalHeightRegions = 0; | |
845 for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m
_regionList.end(); ++iter) { | |
846 const RenderRegion* region = *iter; | |
847 if (region->hasAutoLogicalHeight()) | |
848 autoLogicalHeightRegions++; | |
849 } | |
850 | |
851 return autoLogicalHeightRegions == m_autoLogicalHeightRegionsCount; | |
852 } | |
853 #endif | |
854 | |
855 // During the normal layout phase of the named flow the regions are initialized
with a height equal to their max-height. | |
856 // This way unforced breaks are automatically placed when a region is full and t
he content height/position correctly estimated. | |
857 // Also, the region where a forced break falls is exactly the region found at th
e forced break offset inside the flow content. | |
858 void RenderFlowThread::initializeRegionsComputedAutoHeight(RenderRegion* startRe
gion) | |
859 { | |
860 ASSERT(!inConstrainedLayoutPhase()); | |
861 if (!hasAutoLogicalHeightRegions()) | |
862 return; | |
863 | |
864 RenderRegionList::iterator regionIter = startRegion ? m_regionList.find(star
tRegion) : m_regionList.begin(); | |
865 for (; regionIter != m_regionList.end(); ++regionIter) { | |
866 RenderRegion* region = *regionIter; | |
867 if (region->hasAutoLogicalHeight()) | |
868 region->setComputedAutoHeight(region->maxPageLogicalHeight()); | |
869 } | |
870 } | |
871 | |
872 void RenderFlowThread::markAutoLogicalHeightRegionsForLayout() | |
873 { | |
874 ASSERT(hasAutoLogicalHeightRegions()); | |
875 | |
876 for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regio
nList.end(); ++iter) { | |
877 RenderRegion* region = *iter; | |
878 if (!region->hasAutoLogicalHeight()) | |
879 continue; | |
880 | |
881 // FIXME: We need to find a way to avoid marking all the regions ancesto
rs for layout | |
882 // as we are already inside layout. | |
883 region->setNeedsLayout(); | |
884 } | |
885 } | |
886 | |
887 void RenderFlowThread::updateRegionsFlowThreadPortionRect(const RenderRegion* la
stRegionWithContent) | |
888 { | |
889 ASSERT(!lastRegionWithContent || (!inConstrainedLayoutPhase() && hasAutoLogi
calHeightRegions())); | |
890 LayoutUnit logicalHeight = 0; | |
891 bool emptyRegionsSegment = false; | |
892 // FIXME: Optimize not to clear the interval all the time. This implies manu
ally managing the tree nodes lifecycle. | |
893 m_regionIntervalTree.clear(); | |
894 m_regionIntervalTree.initIfNeeded(); | |
895 for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regio
nList.end(); ++iter) { | |
896 RenderRegion* region = *iter; | |
897 | |
898 // If we find an empty auto-height region, clear the computedAutoHeight
value. | |
899 if (emptyRegionsSegment && region->hasAutoLogicalHeight()) | |
900 region->clearComputedAutoHeight(); | |
901 | |
902 LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); | |
903 LayoutUnit regionLogicalHeight = std::min<LayoutUnit>(RenderFlowThread::
maxLogicalHeight() - logicalHeight, region->logicalHeightOfAllFlowThreadContent(
)); | |
904 | |
905 LayoutRect regionRect(style()->direction() == LTR ? LayoutUnit() : logic
alWidth() - regionLogicalWidth, logicalHeight, regionLogicalWidth, regionLogical
Height); | |
906 | |
907 region->setFlowThreadPortionRect(isHorizontalWritingMode() ? regionRect
: regionRect.transposedRect()); | |
908 | |
909 m_regionIntervalTree.add(RegionIntervalTree::createInterval(logicalHeigh
t, logicalHeight + regionLogicalHeight, region)); | |
910 | |
911 logicalHeight += regionLogicalHeight; | |
912 | |
913 // Once we find the last region with content the next regions are consid
ered empty. | |
914 if (lastRegionWithContent == region) | |
915 emptyRegionsSegment = true; | |
916 } | |
917 | |
918 ASSERT(!lastRegionWithContent || emptyRegionsSegment); | |
919 } | |
920 | |
921 // Even if we require the break to occur at offsetBreakInFlowThread, because reg
ions may have min/max-height values, | |
922 // it is possible that the break will occur at a different offset than the origi
nal one required. | |
923 // offsetBreakAdjustment measures the different between the requested break offs
et and the current break offset. | |
924 bool RenderFlowThread::addForcedRegionBreak(LayoutUnit offsetBreakInFlowThread,
RenderObject* breakChild, bool isBefore, LayoutUnit* offsetBreakAdjustment) | |
925 { | |
926 // We take breaks into account for height computation for auto logical heigh
t regions | |
927 // only in the layout phase in which we lay out the flows threads unconstrai
ned | |
928 // and we use the content breaks to determine the computedAutoHeight for | |
929 // auto logical height regions. | |
930 if (inConstrainedLayoutPhase()) | |
931 return false; | |
932 | |
933 // Breaks can come before or after some objects. We need to track these obje
cts, so that if we get | |
934 // multiple breaks for the same object (for example because of multiple layo
uts on the same object), | |
935 // we need to invalidate every other region after the old one and start comp
uting from fresh. | |
936 RenderObjectToRegionMap& mapToUse = isBefore ? m_breakBeforeToRegionMap : m_
breakAfterToRegionMap; | |
937 RenderObjectToRegionMap::iterator iter = mapToUse.find(breakChild); | |
938 if (iter != mapToUse.end()) { | |
939 RenderRegionList::iterator regionIter = m_regionList.find(iter->value); | |
940 ASSERT_WITH_SECURITY_IMPLICATION(regionIter != m_regionList.end()); | |
941 ASSERT((*regionIter)->hasAutoLogicalHeight()); | |
942 initializeRegionsComputedAutoHeight(*regionIter); | |
943 | |
944 // We need to update the regions flow thread portion rect because we are
going to process | |
945 // a break on these regions. | |
946 updateRegionsFlowThreadPortionRect(); | |
947 } | |
948 | |
949 // Simulate a region break at offsetBreakInFlowThread. If it points inside a
n auto logical height region, | |
950 // then it determines the region computed auto height. | |
951 RenderRegion* region = regionAtBlockOffset(offsetBreakInFlowThread); | |
952 if (!region) | |
953 return false; | |
954 | |
955 bool lastBreakAfterContent = breakChild == this; | |
956 bool hasComputedAutoHeight = false; | |
957 | |
958 LayoutUnit currentRegionOffsetInFlowThread = isHorizontalWritingMode() ? reg
ion->flowThreadPortionRect().y() : region->flowThreadPortionRect().x(); | |
959 LayoutUnit offsetBreakInCurrentRegion = offsetBreakInFlowThread - currentReg
ionOffsetInFlowThread; | |
960 | |
961 if (region->hasAutoLogicalHeight()) { | |
962 // A forced break can appear only in an auto-height region that didn't h
ave a forced break before. | |
963 // This ASSERT is a good-enough heuristic to verify the above condition. | |
964 ASSERT(region->maxPageLogicalHeight() == region->computedAutoHeight()); | |
965 | |
966 mapToUse.set(breakChild, region); | |
967 | |
968 hasComputedAutoHeight = true; | |
969 | |
970 // Compute the region height pretending that the offsetBreakInCurrentReg
ion is the logicalHeight for the auto-height region. | |
971 LayoutUnit regionComputedAutoHeight = region->constrainContentBoxLogical
HeightByMinMax(offsetBreakInCurrentRegion, -1); | |
972 | |
973 // The new height of this region needs to be smaller than the initial va
lue, the max height. A forced break is the only way to change the initial | |
974 // height of an auto-height region besides content ending. | |
975 ASSERT(regionComputedAutoHeight <= region->maxPageLogicalHeight()); | |
976 | |
977 region->setComputedAutoHeight(regionComputedAutoHeight); | |
978 | |
979 currentRegionOffsetInFlowThread += regionComputedAutoHeight; | |
980 } else { | |
981 currentRegionOffsetInFlowThread += isHorizontalWritingMode() ? region->f
lowThreadPortionRect().height() : region->flowThreadPortionRect().width(); | |
982 } | |
983 | |
984 // If the break was found inside an auto-height region its size changed so w
e need to recompute the flow thread portion rectangles. | |
985 // Also, if this is the last break after the content we need to clear the co
mputedAutoHeight value on the last empty regions. | |
986 if (hasAutoLogicalHeightRegions() && lastBreakAfterContent) | |
987 updateRegionsFlowThreadPortionRect(region); | |
988 else if (hasComputedAutoHeight) | |
989 updateRegionsFlowThreadPortionRect(); | |
990 | |
991 if (offsetBreakAdjustment) | |
992 *offsetBreakAdjustment = max<LayoutUnit>(0, currentRegionOffsetInFlowThr
ead - offsetBreakInFlowThread); | |
993 | |
994 return hasComputedAutoHeight; | |
995 } | |
996 | |
997 void RenderFlowThread::incrementAutoLogicalHeightRegions() | |
998 { | |
999 if (!m_autoLogicalHeightRegionsCount) | |
1000 view()->flowThreadController()->incrementFlowThreadsWithAutoLogicalHeigh
tRegions(); | |
1001 ++m_autoLogicalHeightRegionsCount; | |
1002 } | |
1003 | |
1004 void RenderFlowThread::decrementAutoLogicalHeightRegions() | |
1005 { | |
1006 ASSERT(m_autoLogicalHeightRegionsCount > 0); | |
1007 --m_autoLogicalHeightRegionsCount; | |
1008 if (!m_autoLogicalHeightRegionsCount) | |
1009 view()->flowThreadController()->decrementFlowThreadsWithAutoLogicalHeigh
tRegions(); | |
1010 } | |
1011 | |
1012 void RenderFlowThread::collectLayerFragments(LayerFragments& layerFragments, con
st LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect) | |
1013 { | |
1014 ASSERT(!m_regionsInvalidated); | |
1015 | |
1016 for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m
_regionList.end(); ++iter) { | |
1017 RenderRegion* region = *iter; | |
1018 region->collectLayerFragments(layerFragments, layerBoundingBox, dirtyRec
t); | |
1019 } | |
1020 } | |
1021 | |
1022 LayoutRect RenderFlowThread::fragmentsBoundingBox(const LayoutRect& layerBoundin
gBox) | |
1023 { | |
1024 ASSERT(!m_regionsInvalidated); | |
1025 | |
1026 LayoutRect result; | |
1027 for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m
_regionList.end(); ++iter) { | |
1028 RenderRegion* region = *iter; | |
1029 LayerFragments fragments; | |
1030 region->collectLayerFragments(fragments, layerBoundingBox, PaintInfo::in
finiteRect()); | |
1031 for (size_t i = 0; i < fragments.size(); ++i) { | |
1032 const LayerFragment& fragment = fragments.at(i); | |
1033 LayoutRect fragmentRect(layerBoundingBox); | |
1034 fragmentRect.intersect(fragment.paginationClip); | |
1035 fragmentRect.moveBy(fragment.paginationOffset); | |
1036 result.unite(fragmentRect); | |
1037 } | |
1038 } | |
1039 | |
1040 return result; | |
1041 } | |
1042 | |
1043 bool RenderFlowThread::cachedOffsetFromLogicalTopOfFirstRegion(const RenderBox*
box, LayoutUnit& result) const | |
1044 { | |
1045 RenderBoxToOffsetMap::const_iterator offsetIterator = m_boxesToOffsetMap.fin
d(box); | |
1046 if (offsetIterator == m_boxesToOffsetMap.end()) | |
1047 return false; | |
1048 | |
1049 result = offsetIterator->value; | |
1050 return true; | |
1051 } | |
1052 | |
1053 void RenderFlowThread::setOffsetFromLogicalTopOfFirstRegion(const RenderBox* box
, LayoutUnit offset) | |
1054 { | |
1055 m_boxesToOffsetMap.set(box, offset); | |
1056 } | |
1057 | |
1058 void RenderFlowThread::clearOffsetFromLogicalTopOfFirstRegion(const RenderBox* b
ox) | |
1059 { | |
1060 ASSERT(m_boxesToOffsetMap.contains(box)); | |
1061 m_boxesToOffsetMap.remove(box); | |
1062 } | |
1063 | |
1064 const RenderBox* RenderFlowThread::currentStatePusherRenderBox() const | |
1065 { | |
1066 const RenderObject* currentObject = m_statePusherObjectsStack.isEmpty() ? 0
: m_statePusherObjectsStack.last(); | |
1067 if (currentObject && currentObject->isBox()) | |
1068 return toRenderBox(currentObject); | |
1069 | |
1070 return 0; | |
1071 } | |
1072 | |
1073 void RenderFlowThread::pushFlowThreadLayoutState(const RenderObject* object) | |
1074 { | |
1075 if (const RenderBox* currentBoxDescendant = currentStatePusherRenderBox()) { | |
1076 LayoutState* layoutState = currentBoxDescendant->view()->layoutState(); | |
1077 if (layoutState && layoutState->isPaginated()) { | |
1078 ASSERT(layoutState->renderer() == currentBoxDescendant); | |
1079 LayoutSize offsetDelta = layoutState->m_layoutOffset - layoutState->
m_pageOffset; | |
1080 setOffsetFromLogicalTopOfFirstRegion(currentBoxDescendant, currentBo
xDescendant->isHorizontalWritingMode() ? offsetDelta.height() : offsetDelta.widt
h()); | |
1081 } | |
1082 } | |
1083 | |
1084 m_statePusherObjectsStack.add(object); | |
1085 } | |
1086 | |
1087 void RenderFlowThread::popFlowThreadLayoutState() | |
1088 { | |
1089 m_statePusherObjectsStack.removeLast(); | |
1090 | |
1091 if (const RenderBox* currentBoxDescendant = currentStatePusherRenderBox()) { | |
1092 LayoutState* layoutState = currentBoxDescendant->view()->layoutState(); | |
1093 if (layoutState && layoutState->isPaginated()) | |
1094 clearOffsetFromLogicalTopOfFirstRegion(currentBoxDescendant); | |
1095 } | |
1096 } | |
1097 | |
1098 LayoutUnit RenderFlowThread::offsetFromLogicalTopOfFirstRegion(const RenderBlock
* currentBlock) const | |
1099 { | |
1100 // First check if we cached the offset for the block if it's an ancestor con
taining block of the box | |
1101 // being currently laid out. | |
1102 LayoutUnit offset; | |
1103 if (cachedOffsetFromLogicalTopOfFirstRegion(currentBlock, offset)) | |
1104 return offset; | |
1105 | |
1106 // If it's the current box being laid out, use the layout state. | |
1107 const RenderBox* currentBoxDescendant = currentStatePusherRenderBox(); | |
1108 if (currentBlock == currentBoxDescendant) { | |
1109 LayoutState* layoutState = view()->layoutState(); | |
1110 ASSERT(layoutState->renderer() == currentBlock); | |
1111 ASSERT(layoutState && layoutState->isPaginated()); | |
1112 LayoutSize offsetDelta = layoutState->m_layoutOffset - layoutState->m_pa
geOffset; | |
1113 return currentBoxDescendant->isHorizontalWritingMode() ? offsetDelta.hei
ght() : offsetDelta.width(); | |
1114 } | |
1115 | |
1116 // As a last resort, take the slow path. | |
1117 LayoutRect blockRect(0, 0, currentBlock->width(), currentBlock->height()); | |
1118 while (currentBlock && !currentBlock->isRenderFlowThread()) { | |
1119 RenderBlock* containerBlock = currentBlock->containingBlock(); | |
1120 ASSERT(containerBlock); | |
1121 if (!containerBlock) | |
1122 return 0; | |
1123 LayoutPoint currentBlockLocation = currentBlock->location(); | |
1124 | |
1125 if (containerBlock->style()->writingMode() != currentBlock->style()->wri
tingMode()) { | |
1126 // We have to put the block rect in container coordinates | |
1127 // and we have to take into account both the container and current b
lock flipping modes | |
1128 if (containerBlock->style()->isFlippedBlocksWritingMode()) { | |
1129 if (containerBlock->isHorizontalWritingMode()) | |
1130 blockRect.setY(currentBlock->height() - blockRect.maxY()); | |
1131 else | |
1132 blockRect.setX(currentBlock->width() - blockRect.maxX()); | |
1133 } | |
1134 currentBlock->flipForWritingMode(blockRect); | |
1135 } | |
1136 blockRect.moveBy(currentBlockLocation); | |
1137 currentBlock = containerBlock; | |
1138 } | |
1139 | |
1140 return currentBlock->isHorizontalWritingMode() ? blockRect.y() : blockRect.x
(); | |
1141 } | |
1142 | |
1143 void RenderFlowThread::RegionSearchAdapter::collectIfNeeded(const RegionInterval
& interval) | |
1144 { | |
1145 if (m_result) | |
1146 return; | |
1147 if (interval.low() <= m_offset && interval.high() > m_offset) | |
1148 m_result = interval.data(); | |
1149 } | |
1150 | |
1151 void RenderFlowThread::mapLocalToContainer(const RenderLayerModelObject* repaint
Container, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFi
xed) const | |
1152 { | |
1153 if (this == repaintContainer) | |
1154 return; | |
1155 | |
1156 if (RenderRegion* region = mapFromFlowToRegion(transformState)) { | |
1157 // FIXME: The cast below is probably not the best solution, we may need
to find a better way. | |
1158 static_cast<const RenderObject*>(region)->mapLocalToContainer(region->co
ntainerForRepaint(), transformState, mode, wasFixed); | |
1159 } | |
1160 } | |
1161 | |
1162 CurrentRenderFlowThreadMaintainer::CurrentRenderFlowThreadMaintainer(RenderFlowT
hread* renderFlowThread) | |
1163 : m_renderFlowThread(renderFlowThread) | |
1164 , m_previousRenderFlowThread(0) | |
1165 { | |
1166 if (!m_renderFlowThread) | |
1167 return; | |
1168 RenderView* view = m_renderFlowThread->view(); | |
1169 m_previousRenderFlowThread = view->flowThreadController()->currentRenderFlow
Thread(); | |
1170 ASSERT(!m_previousRenderFlowThread || !renderFlowThread->isRenderNamedFlowTh
read()); | |
1171 view->flowThreadController()->setCurrentRenderFlowThread(m_renderFlowThread)
; | |
1172 } | |
1173 | |
1174 CurrentRenderFlowThreadMaintainer::~CurrentRenderFlowThreadMaintainer() | |
1175 { | |
1176 if (!m_renderFlowThread) | |
1177 return; | |
1178 RenderView* view = m_renderFlowThread->view(); | |
1179 ASSERT(view->flowThreadController()->currentRenderFlowThread() == m_renderFl
owThread); | |
1180 view->flowThreadController()->setCurrentRenderFlowThread(m_previousRenderFlo
wThread); | |
1181 } | |
1182 | |
1183 | |
1184 } // namespace WebCore | |
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