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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"
42 RenderLineBoxList::~RenderLineBoxList()
44 ASSERT(!m_firstLineBox);
45 ASSERT(!m_lastLineBox);
49 void RenderLineBoxList::appendLineBox(InlineFlowBox* box)
54 m_firstLineBox = m_lastLineBox = box;
56 m_lastLineBox->setNextLineBox(box);
57 box->setPreviousLineBox(m_lastLineBox);
64 void RenderLineBoxList::deleteLineBoxTree()
66 InlineFlowBox* line = m_firstLineBox;
67 InlineFlowBox* nextLine;
69 nextLine = line->nextLineBox();
73 m_firstLineBox = m_lastLineBox = 0;
76 void RenderLineBoxList::extractLineBox(InlineFlowBox* box)
80 m_lastLineBox = box->prevLineBox();
81 if (box == m_firstLineBox)
83 if (box->prevLineBox())
84 box->prevLineBox()->setNextLineBox(0);
85 box->setPreviousLineBox(0);
86 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox())
92 void RenderLineBoxList::attachLineBox(InlineFlowBox* box)
97 m_lastLineBox->setNextLineBox(box);
98 box->setPreviousLineBox(m_lastLineBox);
100 m_firstLineBox = box;
101 InlineFlowBox* last = box;
102 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) {
103 curr->setExtracted(false);
106 m_lastLineBox = last;
111 void RenderLineBoxList::removeLineBox(InlineFlowBox* box)
115 if (box == m_firstLineBox)
116 m_firstLineBox = box->nextLineBox();
117 if (box == m_lastLineBox)
118 m_lastLineBox = box->prevLineBox();
119 if (box->nextLineBox())
120 box->nextLineBox()->setPreviousLineBox(box->prevLineBox());
121 if (box->prevLineBox())
122 box->prevLineBox()->setNextLineBox(box->nextLineBox());
127 void RenderLineBoxList::deleteLineBoxes()
129 if (m_firstLineBox) {
131 for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) {
132 next = curr->nextLineBox();
140 void RenderLineBoxList::dirtyLineBoxes()
142 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox())
143 curr->dirtyLineBoxes();
146 bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect& rect, const LayoutPoint& offset) const
149 if (renderer->isBox())
150 block = toRenderBox(renderer);
152 block = renderer->containingBlock();
153 LayoutUnit physicalStart = block->flipForWritingMode(logicalTop);
154 LayoutUnit physicalEnd = block->flipForWritingMode(logicalBottom);
155 LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart);
156 physicalStart = std::min(physicalStart, physicalEnd);
158 if (renderer->style()->isHorizontalWritingMode()) {
159 physicalStart += offset.y();
160 if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y())
163 physicalStart += offset.x();
164 if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x())
171 bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* renderer, const LayoutRect& rect, const LayoutPoint& offset) const
173 // We can check the first box and last box and avoid painting/hit testing if we don't
174 // intersect. This is a quick short-circuit that we can take to avoid walking any lines.
175 // FIXME: This check is flawed in the following extremely obscure way:
176 // if some line in the middle has a huge overflow, it might actually extend below the last line.
177 RootInlineBox& firstRootBox = firstLineBox()->root();
178 RootInlineBox& lastRootBox = lastLineBox()->root();
179 LayoutUnit firstLineTop = firstLineBox()->logicalTopVisualOverflow(firstRootBox.lineTop());
180 LayoutUnit lastLineBottom = lastLineBox()->logicalBottomVisualOverflow(lastRootBox.lineBottom());
182 return rangeIntersectsRect(renderer, firstLineTop, lastLineBottom, rect, offset);
185 bool RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, InlineFlowBox* box, const PaintInfo& paintInfo, const LayoutPoint& offset) const
187 RootInlineBox& root = box->root();
188 LayoutUnit logicalTop = std::min<LayoutUnit>(box->logicalTopVisualOverflow(root.lineTop()), root.selectionTop());
189 LayoutUnit logicalBottom = box->logicalBottomVisualOverflow(root.lineBottom());
191 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, offset);
194 void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
196 // Only paint during the foreground/selection phases.
197 if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline
198 && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip
199 && paintInfo.phase != PaintPhaseMask)
202 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.
204 // If we have no lines then we have no work to do.
208 if (!anyLineIntersectsRect(renderer, paintInfo.rect, paintOffset))
211 PaintInfo info(paintInfo);
212 ListHashSet<RenderInline*> outlineObjects;
213 info.setOutlineObjects(&outlineObjects);
215 // See if our root lines intersect with the dirty rect. If so, then we paint
216 // them. Note that boxes can easily overlap, so we can't make any assumptions
217 // based off positions of our first line box or our last line box.
218 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
219 if (lineIntersectsDirtyRect(renderer, curr, info, paintOffset)) {
220 RootInlineBox& root = curr->root();
221 curr->paint(info, paintOffset, root.lineTop(), root.lineBottom());
225 if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) {
226 ListHashSet<RenderInline*>::iterator end = info.outlineObjects()->end();
227 for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects()->begin(); it != end; ++it) {
228 RenderInline* flow = *it;
229 flow->paintOutline(info, paintOffset);
231 info.outlineObjects()->clear();
235 bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const
237 if (hitTestAction != HitTestForeground)
240 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer.
242 // If we have no lines then we have no work to do.
246 LayoutPoint point = locationInContainer.point();
247 LayoutRect rect = firstLineBox()->isHorizontal() ?
248 IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) :
249 IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1);
251 if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset))
254 // See if our root lines contain the point. If so, then we hit test
255 // them further. Note that boxes can easily overlap, so we can't make any assumptions
256 // based off positions of our first line box or our last line box.
257 for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) {
258 RootInlineBox& root = curr->root();
259 if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(root.lineTop()), curr->logicalBottomVisualOverflow(root.lineBottom()), rect, accumulatedOffset)) {
260 bool inside = curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, root.lineTop(), root.lineBottom());
262 renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
271 void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child)
273 if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isRenderBlockFlow())))
276 RenderInline* inlineContainer = container->isRenderInline() ? toRenderInline(container) : 0;
277 InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox();
279 // If we have no first line box, then just bail early.
281 // For an empty inline, go ahead and propagate the check up to our parent, unless the parent
283 if (container->isInline() && !container->ancestorLineBoxDirty()) {
284 container->parent()->dirtyLinesFromChangedChild(container);
285 container->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
290 // Try to figure out which line box we belong in. First try to find a previous
291 // line box by examining our siblings. If we didn't find a line box, then use our
292 // parent's first line box.
293 RootInlineBox* box = 0;
294 RenderObject* curr = 0;
295 ListHashSet<RenderObject*, 16> potentialLineBreakObjects;
296 potentialLineBreakObjects.add(child);
297 for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) {
298 potentialLineBreakObjects.add(curr);
300 if (curr->isFloatingOrOutOfFlowPositioned())
303 if (curr->isReplaced()) {
304 InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper();
306 box = &wrapper->root();
307 } else if (curr->isText()) {
308 InlineTextBox* textBox = toRenderText(curr)->lastTextBox();
310 box = &textBox->root();
311 } else if (curr->isRenderInline()) {
312 InlineBox* lastSiblingBox = toRenderInline(curr)->lastLineBoxIncludingCulling();
314 box = &lastSiblingBox->root();
321 if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) {
322 // https://bugs.webkit.org/show_bug.cgi?id=60778
323 // We may have just removed a <br> with no line box that was our first child. In this case
324 // we won't find a previous sibling, but firstBox can be pointing to a following sibling.
325 // This isn't good enough, since we won't locate the root line box that encloses the removed
326 // <br>. We have to just over-invalidate a bit and go up to our parent.
327 if (!inlineContainer->ancestorLineBoxDirty()) {
328 inlineContainer->parent()->dirtyLinesFromChangedChild(inlineContainer);
329 inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
333 box = &firstBox->root();
336 // If we found a line box, then dirty it.
338 RootInlineBox* adjacentBox;
341 // dirty the adjacent lines that might be affected
342 // NOTE: we dirty the previous line because RootInlineBox objects cache
343 // the address of the first object on the next line after a BR, which we may be
344 // invalidating here. For more info, see how RenderBlock::layoutInlineChildren
345 // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak,
346 // despite the name, actually returns the first RenderObject after the BR.
347 // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize."
348 adjacentBox = box->prevRootBox();
350 adjacentBox->markDirty();
351 adjacentBox = box->nextRootBox();
352 // If |child| or any of its immediately previous siblings with culled lineboxes is the object after a line-break in |box| or the linebox after it
353 // then that means |child| actually sits on the linebox after |box| (or is its line-break object) and so we need to dirty it as well.
354 if (adjacentBox && (potentialLineBreakObjects.contains(box->lineBreakObj()) || potentialLineBreakObjects.contains(adjacentBox->lineBreakObj()) || child->isBR() || isIsolated(container->style()->unicodeBidi())))
355 adjacentBox->markDirty();
361 void RenderLineBoxList::checkConsistency() const
363 #ifdef CHECK_CONSISTENCY
364 const InlineFlowBox* prev = 0;
365 for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextLineBox()) {
366 ASSERT(child->prevLineBox() == prev);
369 ASSERT(prev == m_lastLineBox);