| /* |
| * Copyright (C) 2008 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "core/rendering/RenderLineBoxList.h" |
| |
| #include "core/paint/InlinePainter.h" |
| #include "core/rendering/HitTestResult.h" |
| #include "core/rendering/InlineTextBox.h" |
| #include "core/rendering/PaintInfo.h" |
| #include "core/rendering/RenderInline.h" |
| #include "core/rendering/RenderView.h" |
| #include "core/rendering/RootInlineBox.h" |
| |
| namespace blink { |
| |
| #if ENABLE(ASSERT) |
| RenderLineBoxList::~RenderLineBoxList() |
| { |
| ASSERT(!m_firstLineBox); |
| ASSERT(!m_lastLineBox); |
| } |
| #endif |
| |
| void RenderLineBoxList::appendLineBox(InlineFlowBox* box) |
| { |
| checkConsistency(); |
| |
| if (!m_firstLineBox) |
| m_firstLineBox = m_lastLineBox = box; |
| else { |
| m_lastLineBox->setNextLineBox(box); |
| box->setPreviousLineBox(m_lastLineBox); |
| m_lastLineBox = box; |
| } |
| |
| checkConsistency(); |
| } |
| |
| void RenderLineBoxList::deleteLineBoxTree() |
| { |
| InlineFlowBox* line = m_firstLineBox; |
| InlineFlowBox* nextLine; |
| while (line) { |
| nextLine = line->nextLineBox(); |
| line->deleteLine(); |
| line = nextLine; |
| } |
| m_firstLineBox = m_lastLineBox = 0; |
| } |
| |
| void RenderLineBoxList::extractLineBox(InlineFlowBox* box) |
| { |
| checkConsistency(); |
| |
| m_lastLineBox = box->prevLineBox(); |
| if (box == m_firstLineBox) |
| m_firstLineBox = 0; |
| if (box->prevLineBox()) |
| box->prevLineBox()->setNextLineBox(0); |
| box->setPreviousLineBox(0); |
| for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) |
| curr->setExtracted(); |
| |
| checkConsistency(); |
| } |
| |
| void RenderLineBoxList::attachLineBox(InlineFlowBox* box) |
| { |
| checkConsistency(); |
| |
| if (m_lastLineBox) { |
| m_lastLineBox->setNextLineBox(box); |
| box->setPreviousLineBox(m_lastLineBox); |
| } else |
| m_firstLineBox = box; |
| InlineFlowBox* last = box; |
| for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) { |
| curr->setExtracted(false); |
| last = curr; |
| } |
| m_lastLineBox = last; |
| |
| checkConsistency(); |
| } |
| |
| void RenderLineBoxList::removeLineBox(InlineFlowBox* box) |
| { |
| checkConsistency(); |
| |
| if (box == m_firstLineBox) |
| m_firstLineBox = box->nextLineBox(); |
| if (box == m_lastLineBox) |
| m_lastLineBox = box->prevLineBox(); |
| if (box->nextLineBox()) |
| box->nextLineBox()->setPreviousLineBox(box->prevLineBox()); |
| if (box->prevLineBox()) |
| box->prevLineBox()->setNextLineBox(box->nextLineBox()); |
| |
| checkConsistency(); |
| } |
| |
| void RenderLineBoxList::deleteLineBoxes() |
| { |
| if (m_firstLineBox) { |
| InlineFlowBox* next; |
| for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) { |
| next = curr->nextLineBox(); |
| curr->destroy(); |
| } |
| m_firstLineBox = 0; |
| m_lastLineBox = 0; |
| } |
| } |
| |
| void RenderLineBoxList::dirtyLineBoxes() |
| { |
| for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) |
| curr->dirtyLineBoxes(); |
| } |
| |
| bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect& rect, const LayoutPoint& offset) const |
| { |
| RenderBox* block; |
| if (renderer->isBox()) |
| block = toRenderBox(renderer); |
| else |
| block = renderer->containingBlock(); |
| LayoutUnit physicalStart = block->flipForWritingMode(logicalTop); |
| LayoutUnit physicalEnd = block->flipForWritingMode(logicalBottom); |
| LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart); |
| physicalStart = std::min(physicalStart, physicalEnd); |
| |
| if (renderer->style()->isHorizontalWritingMode()) { |
| physicalStart += offset.y(); |
| if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y()) |
| return false; |
| } else { |
| physicalStart += offset.x(); |
| if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x()) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* 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 RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, InlineFlowBox* box, const PaintInfo& paintInfo, const LayoutPoint& offset) const |
| { |
| RootInlineBox& root = box->root(); |
| LayoutUnit logicalTop = std::min<LayoutUnit>(box->logicalTopVisualOverflow(root.lineTop()), root.selectionTop()); |
| LayoutUnit logicalBottom = box->logicalBottomVisualOverflow(root.lineBottom()); |
| |
| return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, offset); |
| } |
| |
| bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, 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; |
| |
| 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(request, result, locationInContainer, accumulatedOffset, root.lineTop(), root.lineBottom()); |
| if (inside) { |
| renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset)); |
| return true; |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child) |
| { |
| if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isRenderBlockFlow()))) |
| return; |
| |
| RenderInline* inlineContainer = container->isRenderInline() ? toRenderInline(container) : 0; |
| InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox(); |
| |
| // If we have no first line box, then just bail early. |
| if (!firstBox) { |
| // For an empty inline, go ahead and propagate the check up to our parent, unless the parent |
| // is already dirty. |
| if (container->isInline() && !container->ancestorLineBoxDirty()) { |
| container->parent()->dirtyLinesFromChangedChild(container); |
| container->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree. |
| } |
| return; |
| } |
| |
| // Try to figure out which line box we belong in. First try to find a previous |
| // line box by examining our siblings. If we didn't find a line box, then use our |
| // parent's first line box. |
| RootInlineBox* box = 0; |
| RenderObject* curr = 0; |
| ListHashSet<RenderObject*, 16> potentialLineBreakObjects; |
| potentialLineBreakObjects.add(child); |
| for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) { |
| potentialLineBreakObjects.add(curr); |
| |
| if (curr->isFloatingOrOutOfFlowPositioned()) |
| continue; |
| |
| if (curr->isReplaced()) { |
| InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper(); |
| if (wrapper) |
| box = &wrapper->root(); |
| } else if (curr->isText()) { |
| InlineTextBox* textBox = toRenderText(curr)->lastTextBox(); |
| if (textBox) |
| box = &textBox->root(); |
| } else if (curr->isRenderInline()) { |
| InlineBox* lastSiblingBox = toRenderInline(curr)->lastLineBoxIncludingCulling(); |
| if (lastSiblingBox) |
| box = &lastSiblingBox->root(); |
| } |
| |
| if (box) |
| break; |
| } |
| if (!box) { |
| if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) { |
| // https://bugs.webkit.org/show_bug.cgi?id=60778 |
| // We may have just removed a <br> with no line box that was our first child. In this case |
| // we won't find a previous sibling, but firstBox can be pointing to a following sibling. |
| // This isn't good enough, since we won't locate the root line box that encloses the removed |
| // <br>. We have to just over-invalidate a bit and go up to our parent. |
| if (!inlineContainer->ancestorLineBoxDirty()) { |
| inlineContainer->parent()->dirtyLinesFromChangedChild(inlineContainer); |
| inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree. |
| } |
| return; |
| } |
| box = &firstBox->root(); |
| } |
| |
| // If we found a line box, then dirty it. |
| if (box) { |
| RootInlineBox* adjacentBox; |
| box->markDirty(); |
| |
| // dirty the adjacent lines that might be affected |
| // NOTE: we dirty the previous line because RootInlineBox objects cache |
| // the address of the first object on the next line after a BR, which we may be |
| // invalidating here. For more info, see how RenderBlock::layoutInlineChildren |
| // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak, |
| // despite the name, actually returns the first RenderObject after the BR. |
| // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize." |
| adjacentBox = box->prevRootBox(); |
| if (adjacentBox) |
| adjacentBox->markDirty(); |
| adjacentBox = box->nextRootBox(); |
| // 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 |
| // 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. |
| if (adjacentBox && (potentialLineBreakObjects.contains(box->lineBreakObj()) || potentialLineBreakObjects.contains(adjacentBox->lineBreakObj()) || child->isBR() || isIsolated(container->style()->unicodeBidi()))) |
| adjacentBox->markDirty(); |
| } |
| } |
| |
| #if ENABLE(ASSERT) |
| |
| void RenderLineBoxList::checkConsistency() const |
| { |
| #ifdef CHECK_CONSISTENCY |
| const InlineFlowBox* prev = 0; |
| for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextLineBox()) { |
| ASSERT(child->prevLineBox() == prev); |
| prev = child; |
| } |
| ASSERT(prev == m_lastLineBox); |
| #endif |
| } |
| |
| #endif |
| |
| } |
