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/*
* 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
}