VisiblePosition RenderReplaced::positionForCoordinates(int x, int y)
{
InlineBox* box = inlineBoxWrapper();
if (!box)
return VisiblePosition(element(), 0, DOWNSTREAM);
// FIXME: This code is buggy if the replaced element is relative positioned.
RootInlineBox* root = box->root();
int top = root->topOverflow();
int bottom = root->nextRootBox() ? root->nextRootBox()->topOverflow() : root->bottomOverflow();
if (y + yPos() < top)
return VisiblePosition(element(), caretMinOffset(), DOWNSTREAM); // coordinates are above
if (y + yPos() >= bottom)
return VisiblePosition(element(), caretMaxOffset(), DOWNSTREAM); // coordinates are below
if (element()) {
if (x <= width() / 2)
return VisiblePosition(element(), 0, DOWNSTREAM);
return VisiblePosition(element(), 1, DOWNSTREAM);
}
return RenderBox::positionForCoordinates(x, y);
}
VisiblePosition RenderReplaced::positionForCoordinates(int _x, int _y)
{
InlineBox *box = inlineBoxWrapper();
if (!box)
return VisiblePosition(element(), 0, DOWNSTREAM);
RootInlineBox *root = box->root();
int absx, absy;
containingBlock()->absolutePosition(absx, absy);
int top = absy + root->topOverflow();
int bottom = root->nextRootBox() ? absy + root->nextRootBox()->topOverflow() : absy + root->bottomOverflow();
if (_y < top)
return VisiblePosition(element(), caretMinOffset(), DOWNSTREAM); // coordinates are above
if (_y >= bottom)
return VisiblePosition(element(), caretMaxOffset(), DOWNSTREAM); // coordinates are below
if (element()) {
if (_x <= absx + xPos() + (width() / 2))
return VisiblePosition(element(), 0, DOWNSTREAM);
return VisiblePosition(element(), 1, DOWNSTREAM);
}
return RenderBox::positionForCoordinates(_x, _y);
}
VisiblePosition RenderReplaced::positionForPoint(const IntPoint& point)
{
InlineBox* box = inlineBoxWrapper();
if (!box)
return createVisiblePosition(0, DOWNSTREAM);
// FIXME: This code is buggy if the replaced element is relative positioned.
RootInlineBox* root = box->root();
int top = root->topOverflow();
int bottom = root->nextRootBox() ? root->nextRootBox()->topOverflow() : root->bottomOverflow();
if (point.y() + y() < top)
return createVisiblePosition(caretMinOffset(), DOWNSTREAM); // coordinates are above
if (point.y() + y() >= bottom)
return createVisiblePosition(caretMaxOffset(), DOWNSTREAM); // coordinates are below
if (node()) {
if (point.x() <= width() / 2)
return createVisiblePosition(0, DOWNSTREAM);
return createVisiblePosition(1, DOWNSTREAM);
}
return RenderBox::positionForPoint(point);
}
GapRects RenderBlockFlow::inlineSelectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* paintInfo)
{
GapRects result;
bool containsStart = selectionState() == SelectionStart || selectionState() == SelectionBoth;
if (!firstLineBox()) {
if (containsStart) {
// Go ahead and update our lastLogicalTop to be the bottom of the block. <hr>s or empty blocks with height can trip this
// case.
lastLogicalTop = rootBlock->blockDirectionOffset(offsetFromRootBlock) + logicalHeight();
lastLogicalLeft = logicalLeftSelectionOffset(rootBlock, logicalHeight());
lastLogicalRight = logicalRightSelectionOffset(rootBlock, logicalHeight());
}
return result;
}
RootInlineBox* lastSelectedLine = 0;
RootInlineBox* curr;
for (curr = firstRootBox(); curr && !curr->hasSelectedChildren(); curr = curr->nextRootBox()) { }
// Now paint the gaps for the lines.
for (; curr && curr->hasSelectedChildren(); curr = curr->nextRootBox()) {
LayoutUnit selTop = curr->selectionTopAdjustedForPrecedingBlock();
LayoutUnit selHeight = curr->selectionHeightAdjustedForPrecedingBlock();
if (!containsStart && !lastSelectedLine && selectionState() != SelectionStart && selectionState() != SelectionBoth) {
result.uniteCenter(blockSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, lastLogicalTop,
lastLogicalLeft, lastLogicalRight, selTop, paintInfo));
}
LayoutRect logicalRect(curr->logicalLeft(), selTop, curr->logicalWidth(), selTop + selHeight);
logicalRect.move(offsetFromRootBlock);
LayoutRect physicalRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, logicalRect);
if (!paintInfo || (physicalRect.y() < paintInfo->rect.maxY() && physicalRect.maxY() > paintInfo->rect.y()))
result.unite(curr->lineSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, selTop, selHeight, paintInfo));
lastSelectedLine = curr;
}
if (containsStart && !lastSelectedLine) {
// VisibleSelection must start just after our last line.
lastSelectedLine = lastRootBox();
}
if (lastSelectedLine && selectionState() != SelectionEnd && selectionState() != SelectionBoth) {
// Go ahead and update our lastY to be the bottom of the last selected line.
lastLogicalTop = rootBlock->blockDirectionOffset(offsetFromRootBlock) + lastSelectedLine->selectionBottom();
lastLogicalLeft = logicalLeftSelectionOffset(rootBlock, lastSelectedLine->selectionBottom());
lastLogicalRight = logicalRightSelectionOffset(rootBlock, lastSelectedLine->selectionBottom());
}
return result;
}
String HitTestResult::innerTextIfTruncated(TextDirection& dir) const
{
for (Node* truncatedNode = m_innerNode.get(); truncatedNode; truncatedNode = truncatedNode->parentNode()) {
if (!truncatedNode->isElementNode())
continue;
if (RenderObject* renderer = truncatedNode->renderer()) {
if (renderer->isRenderBlock()) {
RenderBlock* block = toRenderBlock(renderer);
if (block->style()->textOverflow()) {
for (RootInlineBox* line = block->firstRootBox(); line; line = line->nextRootBox()) {
if (line->hasEllipsisBox()) {
dir = block->style()->direction();
return toElement(truncatedNode)->innerText();
}
}
}
break;
}
}
}
dir = LTR;
return String();
}
String HitTestResult::innerTextIfTruncated(TextDirection& dir) const
{
for (Node* truncatedNode = m_innerNode.get(); truncatedNode; truncatedNode = truncatedNode->parentNode()) {
if (!is<Element>(*truncatedNode))
continue;
if (auto renderer = downcast<Element>(*truncatedNode).renderer()) {
if (is<RenderBlockFlow>(*renderer)) {
RenderBlockFlow& block = downcast<RenderBlockFlow>(*renderer);
if (block.style().textOverflow()) {
for (RootInlineBox* line = block.firstRootBox(); line; line = line->nextRootBox()) {
if (line->hasEllipsisBox()) {
dir = block.style().direction();
return downcast<Element>(*truncatedNode).innerText();
}
}
}
break;
}
}
}
dir = LTR;
return String();
}
PositionWithAffinity RenderSVGText::positionForPoint(const LayoutPoint& pointInContents)
{
RootInlineBox* rootBox = firstRootBox();
if (!rootBox)
return createPositionWithAffinity(0, DOWNSTREAM);
ASSERT(!rootBox->nextRootBox());
ASSERT(childrenInline());
InlineBox* closestBox = toSVGRootInlineBox(rootBox)->closestLeafChildForPosition(pointInContents);
if (!closestBox)
return createPositionWithAffinity(0, DOWNSTREAM);
return closestBox->renderer().positionForPoint(LayoutPoint(pointInContents.x(), closestBox->y()));
}
VisiblePosition RenderSVGText::positionForPoint(const LayoutPoint& pointInContents, const RenderRegion* region)
{
RootInlineBox* rootBox = firstRootBox();
if (!rootBox)
return createVisiblePosition(0, DOWNSTREAM);
ASSERT(!rootBox->nextRootBox());
ASSERT(childrenInline());
InlineBox* closestBox = downcast<SVGRootInlineBox>(*rootBox).closestLeafChildForPosition(pointInContents);
if (!closestBox)
return createVisiblePosition(0, DOWNSTREAM);
return closestBox->renderer().positionForPoint(LayoutPoint(pointInContents.x(), closestBox->y()), region);
}
VisiblePosition RenderSVGText::positionForPoint(const IntPoint& pointInContents)
{
RootInlineBox* rootBox = firstRootBox();
if (!rootBox)
return createVisiblePosition(0, DOWNSTREAM);
ASSERT(rootBox->isSVGRootInlineBox());
ASSERT(!rootBox->nextRootBox());
ASSERT(childrenInline());
InlineBox* closestBox = static_cast<SVGRootInlineBox*>(rootBox)->closestLeafChildForPosition(pointInContents);
if (!closestBox)
return createVisiblePosition(0, DOWNSTREAM);
return closestBox->renderer()->positionForPoint(IntPoint(pointInContents.x(), closestBox->m_y));
}
VisiblePosition RenderSVGText::positionForPoint(const LayoutPoint& pointInContents, const RenderRegion* region)
{
RootInlineBox* rootBox = firstRootBox();
if (!rootBox)
return createVisiblePosition(0, DOWNSTREAM);
ASSERT_WITH_SECURITY_IMPLICATION(rootBox->isSVGRootInlineBox());
ASSERT(!rootBox->nextRootBox());
ASSERT(childrenInline());
InlineBox* closestBox = toSVGRootInlineBox(rootBox)->closestLeafChildForPosition(pointInContents);
if (!closestBox)
return createVisiblePosition(0, DOWNSTREAM);
return closestBox->renderer().positionForPoint(LayoutPoint(pointInContents.x(), closestBox->y()), region);
}
PositionWithAffinity RenderSVGText::positionForPoint(const LayoutPoint& pointInContents)
{
RootInlineBox* rootBox = firstRootBox();
if (!rootBox)
return createPositionWithAffinity(0, DOWNSTREAM);
ASSERT_WITH_SECURITY_IMPLICATION(rootBox->isSVGRootInlineBox());
ASSERT(!rootBox->nextRootBox());
ASSERT(childrenInline());
InlineBox* closestBox = static_cast<SVGRootInlineBox*>(rootBox)->closestLeafChildForPosition(pointInContents);
if (!closestBox)
return createPositionWithAffinity(0, DOWNSTREAM);
return closestBox->renderer()->positionForPoint(LayoutPoint(pointInContents.x(), closestBox->y()));
}
void LineBoxList::dirtyLinesFromChangedChild(LayoutObject* container, LayoutObject* child)
{
if (!container->parent() || (container->isLayoutBlock() && (container->selfNeedsLayout() || !container->isLayoutBlockFlow())))
return;
LayoutInline* inlineContainer = container->isLayoutInline() ? toLayoutInline(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;
LayoutObject* curr = 0;
ListHashSet<LayoutObject*, 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 = toLayoutBox(curr)->inlineBoxWrapper();
if (wrapper)
box = &wrapper->root();
} else if (curr->isText()) {
InlineTextBox* textBox = toLayoutText(curr)->lastTextBox();
if (textBox)
box = &textBox->root();
} else if (curr->isLayoutInline()) {
InlineBox* lastSiblingBox = toLayoutInline(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 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."
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();
}
}
void RenderFlow::dirtyLinesFromChangedChild(RenderObject* child, bool adding)
{
if (!parent() || selfNeedsLayout() || isTable())
return;
// For an empty inline, go ahead and propagate the check up to our parent.
if (isInline() && !firstLineBox())
return parent()->dirtyLinesFromChangedChild(this);
// 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;
for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) {
if (curr->isFloatingOrPositioned())
continue;
if (curr->isReplaced()) {
InlineBox* wrapper = curr->inlineBoxWrapper();
if (wrapper)
box = wrapper->root();
}
else if (curr->isText()) {
InlineTextBox* textBox = static_cast<RenderText*>(curr)->lastTextBox();
if (textBox)
box = textBox->root();
}
else if (curr->isInlineFlow()) {
InlineRunBox* runBox = static_cast<RenderFlow*>(curr)->lastLineBox();
if (runBox)
box = runBox->root();
}
if (box)
break;
}
if (!box && firstLineBox())
box = firstLineBox()->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();
if (child->isBR() || (curr && curr->isBR())) {
adjacentBox = box->nextRootBox();
if (adjacentBox)
adjacentBox->markDirty();
}
}
}
void RenderRubyRun::getOverhang(bool firstLine, RenderObject* startRenderer, RenderObject* endRenderer, int& startOverhang, int& endOverhang) const
{
ASSERT(!needsLayout());
startOverhang = 0;
endOverhang = 0;
RenderRubyBase* rubyBase = this->rubyBase();
RenderRubyText* rubyText = this->rubyText();
if (!rubyBase || !rubyText)
return;
if (!rubyBase->firstRootBox())
return;
int logicalWidth = this->logicalWidth();
// No more than half a ruby is allowed to overhang.
int logicalLeftOverhang = rubyText->style(firstLine)->fontSize() / 2;
int logicalRightOverhang = logicalLeftOverhang;
for (RootInlineBox* rootInlineBox = rubyBase->firstRootBox(); rootInlineBox; rootInlineBox = rootInlineBox->nextRootBox()) {
logicalLeftOverhang = min<int>(logicalLeftOverhang, rootInlineBox->logicalLeft());
logicalRightOverhang = min<int>(logicalRightOverhang, logicalWidth - rootInlineBox->logicalRight());
}
startOverhang = style()->isLeftToRightDirection() ? logicalLeftOverhang : logicalRightOverhang;
endOverhang = style()->isLeftToRightDirection() ? logicalRightOverhang : logicalLeftOverhang;
if (!startRenderer || !startRenderer->isText() || startRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
startOverhang = 0;
if (!endRenderer || !endRenderer->isText() || endRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
endOverhang = 0;
}
void RenderRubyRun::getOverhang(bool firstLine, RenderObject* startRenderer, RenderObject* endRenderer, int& startOverhang, int& endOverhang) const
{
ASSERT(!needsLayout());
startOverhang = 0;
endOverhang = 0;
RenderRubyBase* rubyBase = this->rubyBase();
RenderRubyText* rubyText = this->rubyText();
if (!rubyBase || !rubyText)
return;
if (!rubyBase->firstRootBox())
return;
int logicalWidth = this->logicalWidth();
int logicalLeftOverhang = numeric_limits<int>::max();
int logicalRightOverhang = numeric_limits<int>::max();
for (RootInlineBox* rootInlineBox = rubyBase->firstRootBox(); rootInlineBox; rootInlineBox = rootInlineBox->nextRootBox()) {
logicalLeftOverhang = min<int>(logicalLeftOverhang, rootInlineBox->logicalLeft());
logicalRightOverhang = min<int>(logicalRightOverhang, logicalWidth - rootInlineBox->logicalRight());
}
startOverhang = style()->isLeftToRightDirection() ? logicalLeftOverhang : logicalRightOverhang;
endOverhang = style()->isLeftToRightDirection() ? logicalRightOverhang : logicalLeftOverhang;
if (!startRenderer || !startRenderer->isText() || startRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
startOverhang = 0;
if (!endRenderer || !endRenderer->isText() || endRenderer->style(firstLine)->fontSize() > rubyBase->style(firstLine)->fontSize())
endOverhang = 0;
// We overhang a ruby only if the neighboring render object is a text.
// We can overhang the ruby by no more than half the width of the neighboring text
// and no more than half the font size.
int halfWidthOfFontSize = rubyText->style(firstLine)->fontSize() / 2;
if (startOverhang)
startOverhang = min<int>(startOverhang, min<int>(toRenderText(startRenderer)->minLogicalWidth(), halfWidthOfFontSize));
if (endOverhang)
endOverhang = min<int>(endOverhang, min<int>(toRenderText(endRenderer)->minLogicalWidth(), halfWidthOfFontSize));
}
void RenderLineBoxList::dirtyLinesFromChangedChild(RenderBoxModelObject& container, RenderObject& child)
{
ASSERT(is<RenderInline>(container) || is<RenderBlockFlow>(container));
if (!container.parent() || (is<RenderBlockFlow>(container) && container.selfNeedsLayout()))
return;
RenderInline* inlineContainer = is<RenderInline>(container) ? &downcast<RenderInline>(container) : nullptr;
InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox();
// If we have no first line box, then just bail early.
if (!firstBox) {
// For an empty inline, 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 = nullptr;
RenderObject* current;
for (current = child.previousSibling(); current; current = current->previousSibling()) {
if (current->isFloatingOrOutOfFlowPositioned())
continue;
if (current->isReplaced()) {
if (auto wrapper = downcast<RenderBox>(*current).inlineBoxWrapper())
box = &wrapper->root();
} if (is<RenderLineBreak>(*current)) {
if (auto wrapper = downcast<RenderLineBreak>(*current).inlineBoxWrapper())
box = &wrapper->root();
} else if (is<RenderText>(*current)) {
if (InlineTextBox* textBox = downcast<RenderText>(*current).lastTextBox())
box = &textBox->root();
} else if (is<RenderInline>(*current)) {
InlineBox* lastSiblingBox = downcast<RenderInline>(*current).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) {
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."
if (RootInlineBox* prevBox = box->prevRootBox())
prevBox->markDirty();
// FIXME: We shouldn't need to always dirty the next line. This is only strictly
// necessary some of the time, in situations involving BRs.
if (RootInlineBox* nextBox = box->nextRootBox()) {
nextBox->markDirty();
// Dedicated linebox for floats may be added as the last rootbox. If this occurs with BRs inside inlines that propagte their lineboxes to
// the parent flow, we need to invalidate it explicitly.
// FIXME: We should be able to figure out the actual "changed child" even when we are calling through empty inlines recursively.
if (is<RenderInline>(child) && !downcast<RenderInline>(child).firstLineBoxIncludingCulling()) {
auto* lastRootBox = nextBox->blockFlow().lastRootBox();
if (lastRootBox->isTrailingFloatsRootInlineBox() && !lastRootBox->isDirty())
lastRootBox->markDirty();
}
}
}
}
bool RenderTextLineBoxes::dirtyRange(RenderText& renderer, unsigned start, unsigned end, int lengthDelta)
{
RootInlineBox* firstRootBox = nullptr;
RootInlineBox* lastRootBox = nullptr;
// Dirty all text boxes that include characters in between offset and offset+len.
bool dirtiedLines = false;
for (auto current = m_first; current; current = current->nextTextBox()) {
// FIXME: This shouldn't rely on the end of a dirty line box. See https://bugs.webkit.org/show_bug.cgi?id=97264
// Text run is entirely before the affected range.
if (current->end() < start)
continue;
// Text run is entirely after the affected range.
if (current->start() > end) {
current->offsetRun(lengthDelta);
auto& rootBox = current->root();
if (!firstRootBox) {
firstRootBox = &rootBox;
if (!dirtiedLines) {
// The affected area was in between two runs. Go ahead and mark the root box of
// the run after the affected area as dirty.
firstRootBox->markDirty();
dirtiedLines = true;
}
}
lastRootBox = &rootBox;
continue;
}
if (current->end() >= start && current->end() <= end) {
// Text run overlaps with the left end of the affected range.
current->dirtyLineBoxes();
dirtiedLines = true;
continue;
}
if (current->start() <= start && current->end() >= end) {
// Text run subsumes the affected range.
current->dirtyLineBoxes();
dirtiedLines = true;
continue;
}
if (current->start() <= end && current->end() >= end) {
// Text run overlaps with right end of the affected range.
current->dirtyLineBoxes();
dirtiedLines = true;
continue;
}
}
// Now we have to walk all of the clean lines and adjust their cached line break information
// to reflect our updated offsets.
if (lastRootBox)
lastRootBox = lastRootBox->nextRootBox();
if (firstRootBox) {
auto previousRootBox = firstRootBox->prevRootBox();
if (previousRootBox)
firstRootBox = previousRootBox;
} else if (m_last) {
ASSERT(!lastRootBox);
firstRootBox = &m_last->root();
firstRootBox->markDirty();
dirtiedLines = true;
}
for (auto current = firstRootBox; current && current != lastRootBox; current = current->nextRootBox()) {
if (current->lineBreakObj() == &renderer && current->lineBreakPos() > end)
current->setLineBreakPos(current->lineBreakPos() + lengthDelta);
}
// If the text node is empty, dirty the line where new text will be inserted.
if (!m_first && renderer.parent()) {
renderer.parent()->dirtyLinesFromChangedChild(&renderer);
dirtiedLines = true;
}
return dirtiedLines;
}
void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child)
{
if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isBlockFlow())))
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;
for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) {
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| has been inserted before the first element in the linebox, but after collapsed leading
// space, the search for |child|'s linebox will go past the leading space to the previous linebox and select that
// one as |box|. If we hit that situation here, dirty the |box| actually containing the child too.
bool insertedAfterLeadingSpace = box->lineBreakObj() == child->previousSibling();
if (adjacentBox && (adjacentBox->lineBreakObj() == child || child->isBR() || (curr && curr->isBR()) || insertedAfterLeadingSpace))
adjacentBox->markDirty();
}
}