IntRect RenderInline::linesBoundingBox() const { IntRect result; // See <rdar://problem/5289721>, for an unknown reason the linked list here is sometimes inconsistent, first is non-zero and last is zero. We have been // unable to reproduce this at all (and consequently unable to figure ot why this is happening). The assert will hopefully catch the problem in debug // builds and help us someday figure out why. We also put in a redundant check of lastLineBox() to avoid the crash for now. ASSERT(!firstLineBox() == !lastLineBox()); // Either both are null or both exist. if (firstLineBox() && lastLineBox()) { // Return the width of the minimal left side and the maximal right side. int leftSide = 0; int rightSide = 0; for (InlineRunBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) { if (curr == firstLineBox() || curr->xPos() < leftSide) leftSide = curr->xPos(); if (curr == firstLineBox() || curr->xPos() + curr->width() > rightSide) rightSide = curr->xPos() + curr->width(); } result.setWidth(rightSide - leftSide); result.setX(leftSide); result.setHeight(lastLineBox()->yPos() + lastLineBox()->height() - firstLineBox()->yPos()); result.setY(firstLineBox()->yPos()); } return result; }
bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) const { if (hitTestAction != HitTestForeground) return false; ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer. // If we have no lines then we have no work to do. if (!firstLineBox()) return false; // We can check the first box and last box and avoid hit testing if we don't // contain the point. This is a quick short-circuit that we can take to avoid walking any lines. // FIXME: This check is flawed in the following extremely obscure way: // if some line in the middle has a huge overflow, it might actually extend below the last line. if ((y >= ty + lastLineBox()->root()->bottomVisibleOverflow()) || (y < ty + firstLineBox()->root()->topVisibleOverflow())) return false; // See if our root lines contain the point. If so, then we hit test // them further. Note that boxes can easily overlap, so we can't make any assumptions // based off positions of our first line box or our last line box. for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) { if (y >= ty + curr->root()->topVisibleOverflow() && y < ty + curr->root()->bottomVisibleOverflow()) { bool inside = curr->nodeAtPoint(request, result, x, y, tx, ty); if (inside) { renderer->updateHitTestResult(result, IntPoint(x - tx, y - ty)); return true; } } } return false; }
int RenderInline::height() const { // See <rdar://problem/5289721>, for an unknown reason the linked list here is sometimes inconsistent, first is non-zero and last is zero. We have been // unable to reproduce this at all (and consequently unable to figure ot why this is happening). The assert will hopefully catch the problem in debug // builds and help us someday figure out why. We also put in a redundant check of lastLineBox() to avoid the crash for now. ASSERT(!firstLineBox() == !lastLineBox()); // Either both are null or both exist. if (firstLineBox() && lastLineBox()) return lastLineBox()->yPos() + lastLineBox()->height() - firstLineBox()->yPos(); return 0; }
bool LineBoxList::anyLineIntersectsRect(LayoutBoxModelObject* renderer, const LayoutRect& rect, const LayoutPoint& offset) const { // We can check the first box and last box and avoid painting/hit testing if we don't // intersect. This is a quick short-circuit that we can take to avoid walking any lines. // FIXME: This check is flawed in the following extremely obscure way: // if some line in the middle has a huge overflow, it might actually extend below the last line. RootInlineBox& firstRootBox = firstLineBox()->root(); RootInlineBox& lastRootBox = lastLineBox()->root(); LayoutUnit firstLineTop = firstLineBox()->logicalTopVisualOverflow(firstRootBox.lineTop()); LayoutUnit lastLineBottom = lastLineBox()->logicalBottomVisualOverflow(lastRootBox.lineBottom()); return rangeIntersectsRect(renderer, firstLineTop, lastLineBottom, rect, offset); }
bool LineBoxList::hitTest(LayoutBoxModelObject* renderer, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const { if (hitTestAction != HitTestForeground) return false; ASSERT(renderer->isLayoutBlock() || (renderer->isLayoutInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer. // If we have no lines then we have no work to do. if (!firstLineBox()) return false; LayoutPoint point = locationInContainer.point(); LayoutRect rect(firstLineBox()->isHorizontal() ? IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) : IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1)); if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset)) return false; // See if our root lines contain the point. If so, then we hit test // them further. Note that boxes can easily overlap, so we can't make any assumptions // based off positions of our first line box or our last line box. for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) { RootInlineBox& root = curr->root(); if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(root.lineTop()), curr->logicalBottomVisualOverflow(root.lineBottom()), rect, accumulatedOffset)) { bool inside = curr->nodeAtPoint(result, locationInContainer, accumulatedOffset, root.lineTop(), root.lineBottom()); if (inside) { renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset)); return true; } } } return false; }
void RenderLineBoxList::paint(RenderBoxModelObject* renderer, RenderObject::PaintInfo& paintInfo, int tx, int ty) const { // Only paint during the foreground/selection phases.(只有画前景和选择才会跑到这里) if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip && paintInfo.phase != PaintPhaseMask) return; ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer. // If we have no lines then we have no work to do. if (!firstLineBox()) return; // We can check the first box and last box and avoid painting if we don't // intersect. This is a quick short-circuit that we can take to avoid walking any lines. // FIXME: This check is flawed in the following extremely obscure way: // if some line in the middle has a huge overflow, it might actually extend below the last line. int yPos = firstLineBox()->topVisibleOverflow() - renderer->maximalOutlineSize(paintInfo.phase); int h = renderer->maximalOutlineSize(paintInfo.phase) + lastLineBox()->bottomVisibleOverflow() - yPos; // 要画的inline块(从第一行到最后一行的)整个高度 yPos += ty; // 起始高度 if (yPos >= paintInfo.rect.bottom() || yPos + h <= paintInfo.rect.y()) return; RenderObject::PaintInfo info(paintInfo); ListHashSet<RenderInline*> outlineObjects; info.outlineObjects = &outlineObjects; // See if our root lines intersect with the dirty rect. If so, then we paint // them. Note that boxes can easily overlap, so we can't make any assumptions // based off positions of our first line box or our last line box. RenderView* v = renderer->view(); bool usePrintRect = !v->printRect().isEmpty(); for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) { // 开始对每行进行绘制 if (usePrintRect) { // FIXME: This is a feeble effort to avoid splitting a line across two pages. // It is utterly inadequate, and this should not be done at paint time at all. // The whole way objects break across pages needs to be redone. // Try to avoid splitting a line vertically, but only if it's less than the height // of the entire page. if (curr->bottomVisibleOverflow() - curr->topVisibleOverflow() <= v->printRect().height()) { if (ty + curr->bottomVisibleOverflow() > v->printRect().bottom()) { if (ty + curr->topVisibleOverflow() < v->truncatedAt()) v->setBestTruncatedAt(ty + curr->root()->topVisibleOverflow(), renderer); // If we were able to truncate, don't paint. if (ty + curr->topVisibleOverflow() >= v->truncatedAt()) break; } } } int top = min(curr->topVisibleOverflow(), curr->root()->selectionTop()) - renderer->maximalOutlineSize(info.phase); // 高点 int bottom = curr->bottomVisibleOverflow() + renderer->maximalOutlineSize(info.phase); // 底点 h = bottom - top; // 高度 yPos = ty + top; // 开始绘制点 v->setMinimumColumnHeight(h); if (yPos < info.rect.bottom() && yPos + h > info.rect.y()) curr->paint(info, tx, ty); // 开始绘制该行 } if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) { ListHashSet<RenderInline*>::iterator end = info.outlineObjects->end(); for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects->begin(); it != end; ++it) { RenderInline* flow = *it; flow->paintOutline(info.context, tx, ty); } info.outlineObjects->clear(); } }