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30 #include "core/rendering/RenderLineBoxList.h"
32 #include "core/paint/InlinePainter.h"
33 #include "core/rendering/HitTestResult.h"
34 #include "core/rendering/InlineTextBox.h"
35 #include "core/rendering/PaintInfo.h"
36 #include "core/rendering/RenderInline.h"
37 #include "core/rendering/RenderView.h"
38 #include "core/rendering/RootInlineBox.h"
43 RenderLineBoxList::~RenderLineBoxList()
45 ASSERT(!m_firstLineBox);
46 ASSERT(!m_lastLineBox);
50 void RenderLineBoxList::appendLineBox(InlineFlowBox* box)
55 m_firstLineBox = m_lastLineBox = box;
57 m_lastLineBox->setNextLineBox(box);
58 box->setPreviousLineBox(m_lastLineBox);
65 void RenderLineBoxList::deleteLineBoxTree()
67 InlineFlowBox* line = m_firstLineBox;
68 InlineFlowBox* nextLine;
70 nextLine = line->nextLineBox();
74 m_firstLineBox = m_lastLineBox = 0;
77 void RenderLineBoxList::extractLineBox(InlineFlowBox* box)
81 m_lastLineBox = box->prevLineBox();
82 if (box == m_firstLineBox)
84 if (box->prevLineBox())
85 box->prevLineBox()->setNextLineBox(0);
86 box->setPreviousLineBox(0);
87 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox())
93 void RenderLineBoxList::attachLineBox(InlineFlowBox* box)
98 m_lastLineBox->setNextLineBox(box);
99 box->setPreviousLineBox(m_lastLineBox);
101 m_firstLineBox = box;
102 InlineFlowBox* last = box;
103 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) {
104 curr->setExtracted(false);
107 m_lastLineBox = last;
112 void RenderLineBoxList::removeLineBox(InlineFlowBox* box)
116 if (box == m_firstLineBox)
117 m_firstLineBox = box->nextLineBox();
118 if (box == m_lastLineBox)
119 m_lastLineBox = box->prevLineBox();
120 if (box->nextLineBox())
121 box->nextLineBox()->setPreviousLineBox(box->prevLineBox());
122 if (box->prevLineBox())
123 box->prevLineBox()->setNextLineBox(box->nextLineBox());
128 void RenderLineBoxList::deleteLineBoxes()
130 if (m_firstLineBox) {
132 for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) {
133 next = curr->nextLineBox();
141 void RenderLineBoxList::dirtyLineBoxes()
143 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox())
144 curr->dirtyLineBoxes();
147 bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect& rect, const LayoutPoint& offset) const
150 if (renderer->isBox())
151 block = toRenderBox(renderer);
153 block = renderer->containingBlock();
154 LayoutUnit physicalStart = block->flipForWritingMode(logicalTop);
155 LayoutUnit physicalEnd = block->flipForWritingMode(logicalBottom);
156 LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart);
157 physicalStart = std::min(physicalStart, physicalEnd);
159 if (renderer->style()->isHorizontalWritingMode()) {
160 physicalStart += offset.y();
161 if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y())
164 physicalStart += offset.x();
165 if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x())
172 bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* renderer, const LayoutRect& rect, const LayoutPoint& offset) const
174 // We can check the first box and last box and avoid painting/hit testing if we don't
175 // intersect. This is a quick short-circuit that we can take to avoid walking any lines.
176 // FIXME: This check is flawed in the following extremely obscure way:
177 // if some line in the middle has a huge overflow, it might actually extend below the last line.
178 RootInlineBox& firstRootBox = firstLineBox()->root();
179 RootInlineBox& lastRootBox = lastLineBox()->root();
180 LayoutUnit firstLineTop = firstLineBox()->logicalTopVisualOverflow(firstRootBox.lineTop());
181 LayoutUnit lastLineBottom = lastLineBox()->logicalBottomVisualOverflow(lastRootBox.lineBottom());
183 return rangeIntersectsRect(renderer, firstLineTop, lastLineBottom, rect, offset);
186 bool RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, InlineFlowBox* box, const PaintInfo& paintInfo, const LayoutPoint& offset) const
188 RootInlineBox& root = box->root();
189 LayoutUnit logicalTop = std::min<LayoutUnit>(box->logicalTopVisualOverflow(root.lineTop()), root.selectionTop());
190 LayoutUnit logicalBottom = box->logicalBottomVisualOverflow(root.lineBottom());
192 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, offset);
195 bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const
197 if (hitTestAction != HitTestForeground)
200 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer.
202 // If we have no lines then we have no work to do.
206 LayoutPoint point = locationInContainer.point();
207 LayoutRect rect = firstLineBox()->isHorizontal() ?
208 IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) :
209 IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1);
211 if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset))
214 // See if our root lines contain the point. If so, then we hit test
215 // them further. Note that boxes can easily overlap, so we can't make any assumptions
216 // based off positions of our first line box or our last line box.
217 for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) {
218 RootInlineBox& root = curr->root();
219 if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(root.lineTop()), curr->logicalBottomVisualOverflow(root.lineBottom()), rect, accumulatedOffset)) {
220 bool inside = curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, root.lineTop(), root.lineBottom());
222 renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
231 void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child)
233 if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isRenderBlockFlow())))
236 RenderInline* inlineContainer = container->isRenderInline() ? toRenderInline(container) : 0;
237 InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox();
239 // If we have no first line box, then just bail early.
241 // For an empty inline, go ahead and propagate the check up to our parent, unless the parent
243 if (container->isInline() && !container->ancestorLineBoxDirty()) {
244 container->parent()->dirtyLinesFromChangedChild(container);
245 container->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
250 // Try to figure out which line box we belong in. First try to find a previous
251 // line box by examining our siblings. If we didn't find a line box, then use our
252 // parent's first line box.
253 RootInlineBox* box = 0;
254 RenderObject* curr = 0;
255 ListHashSet<RenderObject*, 16> potentialLineBreakObjects;
256 potentialLineBreakObjects.add(child);
257 for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) {
258 potentialLineBreakObjects.add(curr);
260 if (curr->isFloatingOrOutOfFlowPositioned())
263 if (curr->isReplaced()) {
264 InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper();
266 box = &wrapper->root();
267 } else if (curr->isText()) {
268 InlineTextBox* textBox = toRenderText(curr)->lastTextBox();
270 box = &textBox->root();
271 } else if (curr->isRenderInline()) {
272 InlineBox* lastSiblingBox = toRenderInline(curr)->lastLineBoxIncludingCulling();
274 box = &lastSiblingBox->root();
281 if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) {
282 // https://bugs.webkit.org/show_bug.cgi?id=60778
283 // We may have just removed a <br> with no line box that was our first child. In this case
284 // we won't find a previous sibling, but firstBox can be pointing to a following sibling.
285 // This isn't good enough, since we won't locate the root line box that encloses the removed
286 // <br>. We have to just over-invalidate a bit and go up to our parent.
287 if (!inlineContainer->ancestorLineBoxDirty()) {
288 inlineContainer->parent()->dirtyLinesFromChangedChild(inlineContainer);
289 inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
293 box = &firstBox->root();
296 // If we found a line box, then dirty it.
298 RootInlineBox* adjacentBox;
301 // dirty the adjacent lines that might be affected
302 // NOTE: we dirty the previous line because RootInlineBox objects cache
303 // the address of the first object on the next line after a BR, which we may be
304 // invalidating here. For more info, see how RenderBlock::layoutInlineChildren
305 // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak,
306 // despite the name, actually returns the first RenderObject after the BR.
307 // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize."
308 adjacentBox = box->prevRootBox();
310 adjacentBox->markDirty();
311 adjacentBox = box->nextRootBox();
312 // 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
313 // 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.
314 if (adjacentBox && (potentialLineBreakObjects.contains(box->lineBreakObj()) || potentialLineBreakObjects.contains(adjacentBox->lineBreakObj()) || child->isBR() || isIsolated(container->style()->unicodeBidi())))
315 adjacentBox->markDirty();
321 void RenderLineBoxList::checkConsistency() const
323 #ifdef CHECK_CONSISTENCY
324 const InlineFlowBox* prev = 0;
325 for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextLineBox()) {
326 ASSERT(child->prevLineBox() == prev);
329 ASSERT(prev == m_lastLineBox);