static inline bool findPreviousAndNextAttributes(LayoutSVGText* root, LayoutSVGInlineText* locateElement, SVGTextLayoutAttributes*& previous, SVGTextLayoutAttributes*& next)
{
ASSERT(root);
ASSERT(locateElement);
bool stopAfterNext = false;
LayoutObject* current = root->firstChild();
while (current) {
if (current->isSVGInlineText()) {
LayoutSVGInlineText* text = toLayoutSVGInlineText(current);
if (locateElement != text) {
if (stopAfterNext) {
next = text->layoutAttributes();
return true;
}
previous = text->layoutAttributes();
} else {
stopAfterNext = true;
}
} else if (current->isSVGInline()) {
// Descend into text content (if possible).
if (LayoutObject* child = toLayoutSVGInline(current)->firstChild()) {
current = child;
continue;
}
}
current = current->nextInPreOrderAfterChildren(root);
}
return false;
}
void LayoutSVGText::subtreeChildWillBeRemoved(LayoutObject* child, Vector<SVGTextLayoutAttributes*, 2>& affectedAttributes)
{
ASSERT(child);
if (!shouldHandleSubtreeMutations())
return;
checkLayoutAttributesConsistency(this, m_layoutAttributes);
// The positioning elements cache depends on the size of each text layoutObject in the
// subtree. If this changes, clear the cache. It's going to be rebuilt below.
m_layoutAttributesBuilder.clearTextPositioningElements();
if (m_layoutAttributes.isEmpty() || !child->isSVGInlineText())
return;
// This logic requires that the 'text' child is still inserted in the tree.
LayoutSVGInlineText* text = toLayoutSVGInlineText(child);
SVGTextLayoutAttributes* previous = nullptr;
SVGTextLayoutAttributes* next = nullptr;
if (!documentBeingDestroyed())
findPreviousAndNextAttributes(this, text, previous, next);
if (previous)
affectedAttributes.append(previous);
if (next)
affectedAttributes.append(next);
size_t position = m_layoutAttributes.find(text->layoutAttributes());
ASSERT(position != kNotFound);
m_layoutAttributes.remove(position);
}