void SVGUseElement::buildPendingResource()
{
if (inUseShadowTree())
return;
clearShadowTree();
cancelShadowTreeRecreation();
if (!referencedScope() || !inDocument())
return;
AtomicString id;
Element* target = SVGURIReference::targetElementFromIRIString(hrefString(), treeScope(), &id, externalDocument());
if (!target || !target->inDocument()) {
// If we can't find the target of an external element, just give up.
// We can't observe if the target somewhen enters the external document, nor should we do it.
if (externalDocument())
return;
if (id.isEmpty())
return;
referencedScope()->document().accessSVGExtensions().addPendingResource(id, this);
ASSERT(hasPendingResources());
return;
}
if (target->isSVGElement()) {
buildShadowAndInstanceTree(toSVGElement(target));
invalidateDependentShadowTrees();
}
ASSERT(!m_needsShadowTreeRecreation);
}
void SVGUseElement::invalidateShadowTree()
{
if (!inActiveDocument() || m_needsShadowTreeRecreation)
return;
clearInstanceRoot();
scheduleShadowTreeRecreation();
invalidateDependentShadowTrees();
}
void SVGUseElement::invalidateShadowTree()
{
if (m_needsShadowTreeRecreation)
return;
m_needsShadowTreeRecreation = true;
setNeedsStyleRecalc(ReconstructRenderTree);
invalidateDependentShadowTrees();
}