| /* |
| * 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 "core/layout/line/LineBoxList.h" |
| |
| #include "core/layout/HitTestResult.h" |
| #include "core/layout/api/LineLayoutBox.h" |
| #include "core/layout/api/LineLayoutBoxModel.h" |
| #include "core/layout/api/LineLayoutInline.h" |
| #include "core/layout/api/LineLayoutItem.h" |
| #include "core/layout/line/InlineTextBox.h" |
| #include "core/layout/line/RootInlineBox.h" |
| #include "core/paint/InlinePainter.h" |
| #include "core/paint/PaintInfo.h" |
| |
| namespace blink { |
| |
| #if ENABLE(ASSERT) |
| LineBoxList::~LineBoxList() { |
| ASSERT(!m_firstLineBox); |
| ASSERT(!m_lastLineBox); |
| } |
| #endif |
| |
| void LineBoxList::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 LineBoxList::deleteLineBoxTree() { |
| InlineFlowBox* line = m_firstLineBox; |
| InlineFlowBox* nextLine; |
| while (line) { |
| nextLine = line->nextLineBox(); |
| line->deleteLine(); |
| line = nextLine; |
| } |
| m_firstLineBox = m_lastLineBox = nullptr; |
| } |
| |
| void LineBoxList::extractLineBox(InlineFlowBox* box) { |
| checkConsistency(); |
| |
| m_lastLineBox = box->prevLineBox(); |
| if (box == m_firstLineBox) |
| m_firstLineBox = nullptr; |
| if (box->prevLineBox()) |
| box->prevLineBox()->setNextLineBox(nullptr); |
| box->setPreviousLineBox(nullptr); |
| for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) |
| curr->setExtracted(); |
| |
| checkConsistency(); |
| } |
| |
| void LineBoxList::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 LineBoxList::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 LineBoxList::deleteLineBoxes() { |
| if (m_firstLineBox) { |
| InlineFlowBox* next; |
| for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) { |
| next = curr->nextLineBox(); |
| curr->destroy(); |
| } |
| m_firstLineBox = nullptr; |
| m_lastLineBox = nullptr; |
| } |
| } |
| |
| void LineBoxList::dirtyLineBoxes() { |
| for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) |
| curr->dirtyLineBoxes(); |
| } |
| |
| bool LineBoxList::rangeIntersectsRect(LineLayoutBoxModel layoutObject, |
| LayoutUnit logicalTop, |
| LayoutUnit logicalBottom, |
| const CullRect& cullRect, |
| const LayoutPoint& offset) const { |
| LineLayoutBox block; |
| if (layoutObject.isBox()) |
| block = LineLayoutBox(layoutObject); |
| else |
| block = layoutObject.containingBlock(); |
| LayoutUnit physicalStart = block.flipForWritingMode(logicalTop); |
| LayoutUnit physicalEnd = block.flipForWritingMode(logicalBottom); |
| LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart); |
| physicalStart = std::min(physicalStart, physicalEnd); |
| |
| if (layoutObject.style()->isHorizontalWritingMode()) { |
| physicalStart += offset.y(); |
| return cullRect.intersectsVerticalRange(physicalStart, |
| physicalStart + physicalExtent); |
| } else { |
| physicalStart += offset.x(); |
| return cullRect.intersectsHorizontalRange(physicalStart, |
| physicalStart + physicalExtent); |
| } |
| } |
| |
| bool LineBoxList::anyLineIntersectsRect(LineLayoutBoxModel layoutObject, |
| const CullRect& cullRect, |
| 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(layoutObject, firstLineTop, lastLineBottom, |
| cullRect, offset); |
| } |
| |
| bool LineBoxList::lineIntersectsDirtyRect(LineLayoutBoxModel layoutObject, |
| InlineFlowBox* box, |
| const CullRect& cullRect, |
| 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(layoutObject, logicalTop, logicalBottom, cullRect, |
| offset); |
| } |
| |
| bool LineBoxList::hitTest(LineLayoutBoxModel layoutObject, |
| HitTestResult& result, |
| const HitTestLocation& locationInContainer, |
| const LayoutPoint& accumulatedOffset, |
| HitTestAction hitTestAction) const { |
| if (hitTestAction != HitTestForeground) |
| return false; |
| |
| // The only way an inline could hit test like this is if it has a layer. |
| DCHECK(layoutObject.isLayoutBlock() || |
| (layoutObject.isLayoutInline() && layoutObject.hasLayer())); |
| |
| // If we have no lines then we have no work to do. |
| if (!firstLineBox()) |
| return false; |
| |
| LayoutPoint point = locationInContainer.point(); |
| IntRect hitSearchBoundingBox = locationInContainer.boundingBox(); |
| |
| CullRect cullRect(firstLineBox()->isHorizontal() |
| ? IntRect(point.x().toInt(), hitSearchBoundingBox.y(), |
| 1, hitSearchBoundingBox.height()) |
| : IntRect(hitSearchBoundingBox.x(), point.y().toInt(), |
| hitSearchBoundingBox.width(), 1)); |
| |
| if (!anyLineIntersectsRect(layoutObject, cullRect, 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( |
| layoutObject, curr->logicalTopVisualOverflow(root.lineTop()), |
| curr->logicalBottomVisualOverflow(root.lineBottom()), cullRect, |
| accumulatedOffset)) { |
| bool inside = |
| curr->nodeAtPoint(result, locationInContainer, accumulatedOffset, |
| root.lineTop(), root.lineBottom()); |
| if (inside) { |
| layoutObject.updateHitTestResult( |
| result, |
| locationInContainer.point() - toLayoutSize(accumulatedOffset)); |
| return true; |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| void LineBoxList::dirtyLinesFromChangedChild(LineLayoutItem container, |
| LineLayoutItem child, |
| bool canDirtyAncestors) { |
| if (!container.parent() || |
| (container.isLayoutBlock() && |
| (container.selfNeedsLayout() || !container.isLayoutBlockFlow()))) |
| return; |
| |
| LineLayoutInline inlineContainer = container.isLayoutInline() |
| ? LineLayoutInline(container) |
| : LineLayoutInline(); |
| |
| // If we are attaching children dirtying lines is unnecessary as we will do a |
| // full layout of the inline's contents anyway. |
| if (inlineContainer && inlineContainer.node() && |
| inlineContainer.node()->needsAttach()) |
| return; |
| |
| 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() && |
| canDirtyAncestors) { |
| container.parent().dirtyLinesFromChangedChild(container); |
| // Mark the container to avoid dirtying the same lines again across |
| // multiple destroy() calls of the same subtree. |
| container.setAncestorLineBoxDirty(); |
| } |
| 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 = nullptr; |
| LineLayoutItem curr = nullptr; |
| for (curr = child.previousSibling(); curr; curr = curr.previousSibling()) { |
| if (curr.isFloatingOrOutOfFlowPositioned()) |
| continue; |
| |
| if (curr.isAtomicInlineLevel()) { |
| InlineBox* wrapper = LineLayoutBox(curr).inlineBoxWrapper(); |
| if (wrapper) |
| box = &wrapper->root(); |
| } else if (curr.isText()) { |
| InlineTextBox* textBox = LineLayoutText(curr).lastTextBox(); |
| if (textBox) |
| box = &textBox->root(); |
| } else if (curr.isLayoutInline()) { |
| InlineBox* lastSiblingBox = |
| LineLayoutInline(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() && canDirtyAncestors) { |
| inlineContainer.parent().dirtyLinesFromChangedChild(inlineContainer); |
| // Mark the container to avoid dirtying the same lines again across |
| // multiple destroy() calls of the same subtree. |
| inlineContainer.setAncestorLineBoxDirty(); |
| } |
| return; |
| } |
| box = &firstBox->root(); |
| } |
| |
| // If we found a line box, then dirty it. |
| if (box) { |
| 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 LayoutBlock:: |
| // layoutInlineChildren calls setLineBreakInfo with the result of |
| // findNextLineBreak. findNextLineBreak, despite the name, actually returns |
| // the first LayoutObject after the BR. <rdar://problem/3849947> "Typing |
| // after pasting line does not appear until after window resize." |
| if (RootInlineBox* prevRootBox = box->prevRootBox()) |
| prevRootBox->markDirty(); |
| // 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 (RootInlineBox* nextRootBox = box->nextRootBox()) |
| nextRootBox->markDirty(); |
| } |
| } |
| |
| #if ENABLE(ASSERT) |
| void LineBoxList::checkConsistency() const { |
| #ifdef CHECK_CONSISTENCY |
| const InlineFlowBox* prev = nullptr; |
| for (const InlineFlowBox* child = m_firstLineBox; child; |
| child = child->nextLineBox()) { |
| ASSERT(child->prevLineBox() == prev); |
| prev = child; |
| } |
| ASSERT(prev == m_lastLineBox); |
| #endif |
| } |
| |
| #endif |
| |
| } // namespace blink |
