void SVGUseElement::svgAttributeChanged(const QualifiedName& attrName) {
if (attrName == SVGNames::xAttr || attrName == SVGNames::yAttr ||
attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr) {
SVGElement::InvalidationGuard invalidationGuard(this);
if (attrName == SVGNames::xAttr || attrName == SVGNames::yAttr) {
invalidateSVGPresentationAttributeStyle();
setNeedsStyleRecalc(LocalStyleChange,
StyleChangeReasonForTracing::fromAttribute(attrName));
}
updateRelativeLengthsInformation();
if (m_targetElementInstance) {
ASSERT(m_targetElementInstance->correspondingElement());
transferUseWidthAndHeightIfNeeded(
*this, *m_targetElementInstance,
*m_targetElementInstance->correspondingElement());
}
LayoutObject* object = this->layoutObject();
if (object)
markForLayoutAndParentResourceInvalidation(object);
return;
}
if (SVGURIReference::isKnownAttribute(attrName)) {
SVGElement::InvalidationGuard invalidationGuard(this);
updateTargetReference();
invalidateShadowTree();
return;
}
SVGGraphicsElement::svgAttributeChanged(attrName);
}
void SVGUseElement::buildShadowAndInstanceTree(SVGElement* target)
{
ASSERT(!m_targetElementInstance);
ASSERT(!m_needsShadowTreeRecreation);
// <use> creates a "user agent" shadow root. Do not build the shadow/instance tree for <use>
// elements living in a user agent shadow tree because they will get expanded in a second
// pass -- see expandUseElementsInShadowTree().
if (inUseShadowTree())
return;
// Do not allow self-referencing.
// 'target' may be null, if it's a non SVG namespaced element.
if (!target || target == this || isDisallowedElement(target))
return;
// Set up root SVG element in shadow tree.
RefPtrWillBeRawPtr<Element> newChild = target->cloneElementWithoutChildren();
m_targetElementInstance = toSVGElement(newChild.get());
ShadowRoot* shadowTreeRootElement = userAgentShadowRoot();
shadowTreeRootElement->appendChild(newChild.release());
// Clone the target subtree into the shadow tree, not handling <use> and <symbol> yet.
// SVG specification does not say a word about <use> & cycles. My view on this is: just ignore it!
// Non-appearing <use> content is easier to debug, then half-appearing content.
if (!buildShadowTree(target, m_targetElementInstance.get(), false)) {
clearShadowTree();
return;
}
if (instanceTreeIsLoading(m_targetElementInstance.get()))
return;
// Assure shadow tree building was successfull
ASSERT(m_targetElementInstance);
ASSERT(m_targetElementInstance->correspondingUseElement() == this);
ASSERT(m_targetElementInstance->correspondingElement() == target);
// Expand all <use> elements in the shadow tree.
// Expand means: replace the actual <use> element by what it references.
if (!expandUseElementsInShadowTree(m_targetElementInstance.get())) {
clearShadowTree();
return;
}
// Expand all <symbol> elements in the shadow tree.
// Expand means: replace the actual <symbol> element by the <svg> element.
expandSymbolElementsInShadowTree(toSVGElement(shadowTreeRootElement->firstChild()));
m_targetElementInstance = toSVGElement(shadowTreeRootElement->firstChild());
transferUseWidthAndHeightIfNeeded(*this, m_targetElementInstance.get(), *m_targetElementInstance->correspondingElement());
ASSERT(m_targetElementInstance->parentNode() == shadowTreeRootElement);
// Update relative length information.
updateRelativeLengthsInformation();
}
void SVGUseElement::svgAttributeChanged(const QualifiedName& attrName)
{
if (attrName == SVGNames::xAttr
|| attrName == SVGNames::yAttr
|| attrName == SVGNames::widthAttr
|| attrName == SVGNames::heightAttr) {
SVGElement::InvalidationGuard invalidationGuard(this);
if (attrName == SVGNames::xAttr
|| attrName == SVGNames::yAttr) {
invalidateSVGPresentationAttributeStyle();
setNeedsStyleRecalc(LocalStyleChange,
StyleChangeReasonForTracing::fromAttribute(attrName));
}
updateRelativeLengthsInformation();
if (m_targetElementInstance) {
ASSERT(m_targetElementInstance->correspondingElement());
transferUseWidthAndHeightIfNeeded(*this, m_targetElementInstance.get(), *m_targetElementInstance->correspondingElement());
}
LayoutObject* object = this->layoutObject();
if (object)
markForLayoutAndParentResourceInvalidation(object);
return;
}
if (SVGURIReference::isKnownAttribute(attrName)) {
SVGElement::InvalidationGuard invalidationGuard(this);
if (isStructurallyExternal()) {
KURL url = document().completeURL(hrefString());
const KURL& existingURL = m_resource ? m_resource->url() : KURL();
if (url.hasFragmentIdentifier() && !equalIgnoringFragmentIdentifier(url, existingURL)) {
FetchRequest request(ResourceRequest(url), localName());
setDocumentResource(DocumentResource::fetchSVGDocument(request, document().fetcher()));
}
} else {
setDocumentResource(nullptr);
}
invalidateShadowTree();
return;
}
SVGGraphicsElement::svgAttributeChanged(attrName);
}
bool SVGUseElement::expandUseElementsInShadowTree(SVGElement* element)
{
ASSERT(element);
// Why expand the <use> elements in the shadow tree here, and not just
// do this directly in buildShadowTree, if we encounter a <use> element?
//
// Short answer: Because we may miss to expand some elements. For example, if a <symbol>
// contains <use> tags, we'd miss them. So once we're done with setting up the
// actual shadow tree (after the special case modification for svg/symbol) we have
// to walk it completely and expand all <use> elements.
if (isSVGUseElement(*element)) {
SVGUseElement* use = toSVGUseElement(element);
ASSERT(!use->resourceIsStillLoading());
SVGElement* target = 0;
if (hasCycleUseReferencing(toSVGUseElement(use->correspondingElement()), use, target))
return false;
if (target && isDisallowedElement(target))
return false;
// Don't ASSERT(target) here, it may be "pending", too.
// Setup sub-shadow tree root node
RefPtrWillBeRawPtr<SVGGElement> cloneParent = SVGGElement::create(referencedScope()->document());
cloneParent->setCorrespondingElement(use->correspondingElement());
// Move already cloned elements to the new <g> element
for (RefPtrWillBeRawPtr<Node> child = use->firstChild(); child; ) {
RefPtrWillBeRawPtr<Node> nextChild = child->nextSibling();
cloneParent->appendChild(child);
child = nextChild.release();
}
// Spec: In the generated content, the 'use' will be replaced by 'g', where all attributes from the
// 'use' element except for x, y, width, height and xlink:href are transferred to the generated 'g' element.
transferUseAttributesToReplacedElement(use, cloneParent.get());
if (target) {
RefPtrWillBeRawPtr<Node> newChild = cloneNodeAndAssociate(*target);
ASSERT(newChild->isSVGElement());
transferUseWidthAndHeightIfNeeded(*use, toSVGElement(newChild.get()), *target);
cloneParent->appendChild(newChild.release());
}
// We don't walk the target tree element-by-element, and clone each element,
// but instead use cloneElementWithChildren(). This is an optimization for the common
// case where <use> doesn't contain disallowed elements (ie. <foreignObject>).
// Though if there are disallowed elements in the subtree, we have to remove them.
// For instance: <use> on <g> containing <foreignObject> (indirect case).
if (subtreeContainsDisallowedElement(cloneParent.get()))
removeDisallowedElementsFromSubtree(*cloneParent);
RefPtrWillBeRawPtr<SVGElement> replacingElement(cloneParent.get());
// Replace <use> with referenced content.
ASSERT(use->parentNode());
use->parentNode()->replaceChild(cloneParent.release(), use);
// Expand the siblings because the *element* is replaced and we will
// lose the sibling chain when we are back from recursion.
element = replacingElement.get();
for (RefPtrWillBeRawPtr<SVGElement> sibling = Traversal<SVGElement>::nextSibling(*element); sibling; sibling = Traversal<SVGElement>::nextSibling(*sibling)) {
if (!expandUseElementsInShadowTree(sibling.get()))
return false;
}
}
for (RefPtrWillBeRawPtr<SVGElement> child = Traversal<SVGElement>::firstChild(*element); child; child = Traversal<SVGElement>::nextSibling(*child)) {
if (!expandUseElementsInShadowTree(child.get()))
return false;
}
return true;
}
