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30 #include "core/rendering/RenderLineBoxList.h"
32 #include "core/rendering/HitTestResult.h"
33 #include "core/rendering/InlineTextBox.h"
34 #include "core/rendering/PaintInfo.h"
35 #include "core/rendering/RenderInline.h"
36 #include "core/rendering/RenderView.h"
37 #include "core/rendering/RootInlineBox.h"
44 RenderLineBoxList::~RenderLineBoxList()
46 ASSERT(!m_firstLineBox);
47 ASSERT(!m_lastLineBox);
51 void RenderLineBoxList::appendLineBox(InlineFlowBox* box)
56 m_firstLineBox = m_lastLineBox = box;
58 m_lastLineBox->setNextLineBox(box);
59 box->setPreviousLineBox(m_lastLineBox);
66 void RenderLineBoxList::deleteLineBoxTree()
68 InlineFlowBox* line = m_firstLineBox;
69 InlineFlowBox* nextLine;
71 nextLine = line->nextLineBox();
75 m_firstLineBox = m_lastLineBox = 0;
78 void RenderLineBoxList::extractLineBox(InlineFlowBox* box)
82 m_lastLineBox = box->prevLineBox();
83 if (box == m_firstLineBox)
85 if (box->prevLineBox())
86 box->prevLineBox()->setNextLineBox(0);
87 box->setPreviousLineBox(0);
88 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox())
94 void RenderLineBoxList::attachLineBox(InlineFlowBox* box)
99 m_lastLineBox->setNextLineBox(box);
100 box->setPreviousLineBox(m_lastLineBox);
102 m_firstLineBox = box;
103 InlineFlowBox* last = box;
104 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) {
105 curr->setExtracted(false);
108 m_lastLineBox = last;
113 void RenderLineBoxList::removeLineBox(InlineFlowBox* box)
117 if (box == m_firstLineBox)
118 m_firstLineBox = box->nextLineBox();
119 if (box == m_lastLineBox)
120 m_lastLineBox = box->prevLineBox();
121 if (box->nextLineBox())
122 box->nextLineBox()->setPreviousLineBox(box->prevLineBox());
123 if (box->prevLineBox())
124 box->prevLineBox()->setNextLineBox(box->nextLineBox());
129 void RenderLineBoxList::deleteLineBoxes()
131 if (m_firstLineBox) {
133 for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) {
134 next = curr->nextLineBox();
142 void RenderLineBoxList::dirtyLineBoxes()
144 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox())
145 curr->dirtyLineBoxes();
148 bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect& rect, const LayoutPoint& offset) const
151 if (renderer->isBox())
152 block = toRenderBox(renderer);
154 block = renderer->containingBlock();
155 LayoutUnit physicalStart = block->flipForWritingMode(logicalTop);
156 LayoutUnit physicalEnd = block->flipForWritingMode(logicalBottom);
157 LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart);
158 physicalStart = min(physicalStart, physicalEnd);
160 if (renderer->style()->isHorizontalWritingMode()) {
161 physicalStart += offset.y();
162 if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y())
165 physicalStart += offset.x();
166 if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x())
173 bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* renderer, const LayoutRect& rect, const LayoutPoint& offset, LayoutUnit outlineSize) const
175 // We can check the first box and last box and avoid painting/hit testing if we don't
176 // intersect. This is a quick short-circuit that we can take to avoid walking any lines.
177 // FIXME: This check is flawed in the following extremely obscure way:
178 // if some line in the middle has a huge overflow, it might actually extend below the last line.
179 RootInlineBox* firstRootBox = firstLineBox()->root();
180 RootInlineBox* lastRootBox = lastLineBox()->root();
181 LayoutUnit firstLineTop = firstLineBox()->logicalTopVisualOverflow(firstRootBox->lineTop());
182 LayoutUnit lastLineBottom = lastLineBox()->logicalBottomVisualOverflow(lastRootBox->lineBottom());
183 LayoutUnit logicalTop = firstLineTop - outlineSize;
184 LayoutUnit logicalBottom = outlineSize + lastLineBottom;
186 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, rect, offset);
189 bool RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, InlineFlowBox* box, const PaintInfo& paintInfo, const LayoutPoint& offset) const
191 RootInlineBox* root = box->root();
192 LayoutUnit logicalTop = min<LayoutUnit>(box->logicalTopVisualOverflow(root->lineTop()), root->selectionTop()) - renderer->maximalOutlineSize(paintInfo.phase);
193 LayoutUnit logicalBottom = box->logicalBottomVisualOverflow(root->lineBottom()) + renderer->maximalOutlineSize(paintInfo.phase);
195 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, offset);
198 void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
200 // Only paint during the foreground/selection phases.
201 if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline
202 && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip
203 && paintInfo.phase != PaintPhaseMask)
206 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.
208 // If we have no lines then we have no work to do.
212 LayoutUnit outlineSize = renderer->maximalOutlineSize(paintInfo.phase);
213 if (!anyLineIntersectsRect(renderer, paintInfo.rect, paintOffset, outlineSize))
216 PaintInfo info(paintInfo);
217 ListHashSet<RenderInline*> outlineObjects;
218 info.setOutlineObjects(&outlineObjects);
220 // See if our root lines intersect with the dirty rect. If so, then we paint
221 // them. Note that boxes can easily overlap, so we can't make any assumptions
222 // based off positions of our first line box or our last line box.
223 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
224 if (lineIntersectsDirtyRect(renderer, curr, info, paintOffset)) {
225 RootInlineBox* root = curr->root();
226 curr->paint(info, paintOffset, root->lineTop(), root->lineBottom());
230 if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) {
231 ListHashSet<RenderInline*>::iterator end = info.outlineObjects()->end();
232 for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects()->begin(); it != end; ++it) {
233 RenderInline* flow = *it;
234 flow->paintOutline(info, paintOffset);
236 info.outlineObjects()->clear();
240 bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const
242 if (hitTestAction != HitTestForeground)
245 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer.
247 // If we have no lines then we have no work to do.
251 LayoutPoint point = locationInContainer.point();
252 LayoutRect rect = firstLineBox()->isHorizontal() ?
253 IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) :
254 IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1);
256 if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset))
259 // See if our root lines contain the point. If so, then we hit test
260 // them further. Note that boxes can easily overlap, so we can't make any assumptions
261 // based off positions of our first line box or our last line box.
262 for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) {
263 RootInlineBox* root = curr->root();
264 if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(root->lineTop()), curr->logicalBottomVisualOverflow(root->lineBottom()), rect, accumulatedOffset)) {
265 bool inside = curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, root->lineTop(), root->lineBottom());
267 renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
276 void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child)
278 if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isRenderBlockFlow())))
281 RenderInline* inlineContainer = container->isRenderInline() ? toRenderInline(container) : 0;
282 InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox();
284 // If we have no first line box, then just bail early.
286 // For an empty inline, go ahead and propagate the check up to our parent, unless the parent
288 if (container->isInline() && !container->ancestorLineBoxDirty()) {
289 container->parent()->dirtyLinesFromChangedChild(container);
290 container->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
295 // Try to figure out which line box we belong in. First try to find a previous
296 // line box by examining our siblings. If we didn't find a line box, then use our
297 // parent's first line box.
298 RootInlineBox* box = 0;
299 RenderObject* curr = 0;
300 for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) {
301 if (curr->isFloatingOrOutOfFlowPositioned())
304 if (curr->isReplaced()) {
305 InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper();
307 box = wrapper->root();
308 } else if (curr->isText()) {
309 InlineTextBox* textBox = toRenderText(curr)->lastTextBox();
311 box = textBox->root();
312 } else if (curr->isRenderInline()) {
313 InlineBox* lastSiblingBox = toRenderInline(curr)->lastLineBoxIncludingCulling();
315 box = lastSiblingBox->root();
322 if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) {
323 // https://bugs.webkit.org/show_bug.cgi?id=60778
324 // We may have just removed a <br> with no line box that was our first child. In this case
325 // we won't find a previous sibling, but firstBox can be pointing to a following sibling.
326 // This isn't good enough, since we won't locate the root line box that encloses the removed
327 // <br>. We have to just over-invalidate a bit and go up to our parent.
328 if (!inlineContainer->ancestorLineBoxDirty()) {
329 inlineContainer->parent()->dirtyLinesFromChangedChild(inlineContainer);
330 inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
334 box = firstBox->root();
337 // If we found a line box, then dirty it.
339 RootInlineBox* adjacentBox;
342 // dirty the adjacent lines that might be affected
343 // NOTE: we dirty the previous line because RootInlineBox objects cache
344 // the address of the first object on the next line after a BR, which we may be
345 // invalidating here. For more info, see how RenderBlock::layoutInlineChildren
346 // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak,
347 // despite the name, actually returns the first RenderObject after the BR.
348 // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize."
349 adjacentBox = box->prevRootBox();
351 adjacentBox->markDirty();
352 adjacentBox = box->nextRootBox();
353 // If |child| has been inserted before the first element in the linebox, but after collapsed leading
354 // space, the search for |child|'s linebox will go past the leading space to the previous linebox and select that
355 // one as |box|. If we hit that situation here, dirty the |box| actually containing the child too.
356 bool insertedAfterLeadingSpace = box->lineBreakObj() == child->previousSibling();
357 if (adjacentBox && (adjacentBox->lineBreakObj() == child || child->isBR() || (curr && curr->isBR())
358 || insertedAfterLeadingSpace || isIsolated(container->style()->unicodeBidi()))) {
359 adjacentBox->markDirty();
366 void RenderLineBoxList::checkConsistency() const
368 #ifdef CHECK_CONSISTENCY
369 const InlineFlowBox* prev = 0;
370 for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextLineBox()) {
371 ASSERT(child->prevLineBox() == prev);
374 ASSERT(prev == m_lastLineBox);