| /* |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org> |
| * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org> |
| * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved. |
| * Copyright (C) 2011 Torch Mobile (Beijing) Co. Ltd. All rights reserved. |
| * Copyright (C) 2012 University of Szeged |
| * Copyright (C) 2012 Renata Hodovan <reni@webkit.org> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "config.h" |
| |
| #if ENABLE(SVG) |
| #include "SVGUseElement.h" |
| |
| #include "CachedResourceLoader.h" |
| #include "CachedResourceRequest.h" |
| #include "CachedSVGDocument.h" |
| #include "Document.h" |
| #include "ElementIterator.h" |
| #include "Event.h" |
| #include "EventListener.h" |
| #include "HTMLNames.h" |
| #include "NodeRenderStyle.h" |
| #include "RegisteredEventListener.h" |
| #include "RenderSVGResource.h" |
| #include "RenderSVGTransformableContainer.h" |
| #include "ShadowRoot.h" |
| #include "SVGElementInstance.h" |
| #include "SVGElementRareData.h" |
| #include "SVGElementInstanceList.h" |
| #include "SVGGElement.h" |
| #include "SVGLengthContext.h" |
| #include "SVGNames.h" |
| #include "SVGSMILElement.h" |
| #include "SVGSVGElement.h" |
| #include "SVGSymbolElement.h" |
| #include "StyleResolver.h" |
| #include "XLinkNames.h" |
| #include "XMLDocumentParser.h" |
| #include "XMLSerializer.h" |
| |
| // Dump SVGElementInstance object tree - useful to debug instanceRoot problems |
| // #define DUMP_INSTANCE_TREE |
| |
| // Dump the deep-expanded shadow tree (where the renderers are built from) |
| // #define DUMP_SHADOW_TREE |
| |
| namespace WebCore { |
| |
| // Animated property definitions |
| DEFINE_ANIMATED_LENGTH(SVGUseElement, SVGNames::xAttr, X, x) |
| DEFINE_ANIMATED_LENGTH(SVGUseElement, SVGNames::yAttr, Y, y) |
| DEFINE_ANIMATED_LENGTH(SVGUseElement, SVGNames::widthAttr, Width, width) |
| DEFINE_ANIMATED_LENGTH(SVGUseElement, SVGNames::heightAttr, Height, height) |
| DEFINE_ANIMATED_STRING(SVGUseElement, XLinkNames::hrefAttr, Href, href) |
| DEFINE_ANIMATED_BOOLEAN(SVGUseElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired) |
| |
| BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGUseElement) |
| REGISTER_LOCAL_ANIMATED_PROPERTY(x) |
| REGISTER_LOCAL_ANIMATED_PROPERTY(y) |
| REGISTER_LOCAL_ANIMATED_PROPERTY(width) |
| REGISTER_LOCAL_ANIMATED_PROPERTY(height) |
| REGISTER_LOCAL_ANIMATED_PROPERTY(href) |
| REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired) |
| REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGraphicsElement) |
| END_REGISTER_ANIMATED_PROPERTIES |
| |
| inline SVGUseElement::SVGUseElement(const QualifiedName& tagName, Document& document, bool wasInsertedByParser) |
| : SVGGraphicsElement(tagName, document) |
| , m_x(LengthModeWidth) |
| , m_y(LengthModeHeight) |
| , m_width(LengthModeWidth) |
| , m_height(LengthModeHeight) |
| , m_wasInsertedByParser(wasInsertedByParser) |
| , m_haveFiredLoadEvent(false) |
| , m_needsShadowTreeRecreation(false) |
| , m_svgLoadEventTimer(this, &SVGElement::svgLoadEventTimerFired) |
| { |
| ASSERT(hasCustomStyleResolveCallbacks()); |
| ASSERT(hasTagName(SVGNames::useTag)); |
| registerAnimatedPropertiesForSVGUseElement(); |
| } |
| |
| PassRefPtr<SVGUseElement> SVGUseElement::create(const QualifiedName& tagName, Document& document, bool wasInsertedByParser) |
| { |
| // Always build a #shadow-root for SVGUseElement. |
| RefPtr<SVGUseElement> use = adoptRef(new SVGUseElement(tagName, document, wasInsertedByParser)); |
| use->ensureUserAgentShadowRoot(); |
| return use.release(); |
| } |
| |
| SVGUseElement::~SVGUseElement() |
| { |
| setCachedDocument(0); |
| |
| clearResourceReferences(); |
| } |
| |
| SVGElementInstance* SVGUseElement::instanceRoot() |
| { |
| // If there is no element instance tree, force immediate SVGElementInstance tree |
| // creation by asking the document to invoke our recalcStyle function - as we can't |
| // wait for the lazy creation to happen if e.g. JS wants to access the instanceRoot |
| // object right after creating the element on-the-fly |
| if (!m_targetElementInstance) |
| document().updateLayoutIgnorePendingStylesheets(); |
| |
| return m_targetElementInstance.get(); |
| } |
| |
| SVGElementInstance* SVGUseElement::animatedInstanceRoot() const |
| { |
| // FIXME: Implement me. |
| return 0; |
| } |
| |
| bool SVGUseElement::isSupportedAttribute(const QualifiedName& attrName) |
| { |
| DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ()); |
| if (supportedAttributes.isEmpty()) { |
| SVGLangSpace::addSupportedAttributes(supportedAttributes); |
| SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes); |
| SVGURIReference::addSupportedAttributes(supportedAttributes); |
| supportedAttributes.add(SVGNames::xAttr); |
| supportedAttributes.add(SVGNames::yAttr); |
| supportedAttributes.add(SVGNames::widthAttr); |
| supportedAttributes.add(SVGNames::heightAttr); |
| } |
| return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName); |
| } |
| |
| void SVGUseElement::parseAttribute(const QualifiedName& name, const AtomicString& value) |
| { |
| SVGParsingError parseError = NoError; |
| |
| if (!isSupportedAttribute(name)) |
| SVGGraphicsElement::parseAttribute(name, value); |
| else if (name == SVGNames::xAttr) |
| setXBaseValue(SVGLength::construct(LengthModeWidth, value, parseError)); |
| else if (name == SVGNames::yAttr) |
| setYBaseValue(SVGLength::construct(LengthModeHeight, value, parseError)); |
| else if (name == SVGNames::widthAttr) |
| setWidthBaseValue(SVGLength::construct(LengthModeWidth, value, parseError, ForbidNegativeLengths)); |
| else if (name == SVGNames::heightAttr) |
| setHeightBaseValue(SVGLength::construct(LengthModeHeight, value, parseError, ForbidNegativeLengths)); |
| else if (SVGLangSpace::parseAttribute(name, value) |
| || SVGExternalResourcesRequired::parseAttribute(name, value) |
| || SVGURIReference::parseAttribute(name, value)) { |
| } else |
| ASSERT_NOT_REACHED(); |
| |
| reportAttributeParsingError(parseError, name, value); |
| } |
| |
| #if !ASSERT_DISABLED |
| static inline bool isWellFormedDocument(Document& document) |
| { |
| if (document.isSVGDocument() || document.isXHTMLDocument()) |
| return static_cast<XMLDocumentParser*>(document.parser())->wellFormed(); |
| return true; |
| } |
| #endif |
| |
| Node::InsertionNotificationRequest SVGUseElement::insertedInto(ContainerNode& rootParent) |
| { |
| // This functions exists to assure assumptions made in the code regarding SVGElementInstance creation/destruction are satisfied. |
| SVGGraphicsElement::insertedInto(rootParent); |
| if (!rootParent.inDocument()) |
| return InsertionDone; |
| ASSERT(!m_targetElementInstance || !isWellFormedDocument(document())); |
| ASSERT(!hasPendingResources() || !isWellFormedDocument(document())); |
| if (!m_wasInsertedByParser) |
| buildPendingResource(); |
| SVGExternalResourcesRequired::insertedIntoDocument(this); |
| return InsertionDone; |
| } |
| |
| void SVGUseElement::removedFrom(ContainerNode& rootParent) |
| { |
| SVGGraphicsElement::removedFrom(rootParent); |
| if (rootParent.inDocument()) |
| clearResourceReferences(); |
| } |
| |
| Document* SVGUseElement::referencedDocument() const |
| { |
| if (!isExternalURIReference(href(), document())) |
| return &document(); |
| return externalDocument(); |
| } |
| |
| Document* SVGUseElement::externalDocument() const |
| { |
| if (m_cachedDocument && m_cachedDocument->isLoaded()) { |
| // Gracefully handle error condition. |
| if (m_cachedDocument->errorOccurred()) |
| return 0; |
| ASSERT(m_cachedDocument->document()); |
| return m_cachedDocument->document(); |
| } |
| return 0; |
| } |
| |
| void SVGUseElement::svgAttributeChanged(const QualifiedName& attrName) |
| { |
| if (!isSupportedAttribute(attrName)) { |
| SVGGraphicsElement::svgAttributeChanged(attrName); |
| return; |
| } |
| |
| SVGElementInstance::InvalidationGuard invalidationGuard(this); |
| |
| RenderObject* renderer = this->renderer(); |
| if (attrName == SVGNames::xAttr |
| || attrName == SVGNames::yAttr |
| || attrName == SVGNames::widthAttr |
| || attrName == SVGNames::heightAttr) { |
| updateRelativeLengthsInformation(); |
| if (renderer) |
| RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer); |
| return; |
| } |
| |
| if (SVGExternalResourcesRequired::handleAttributeChange(this, attrName)) |
| return; |
| |
| if (SVGURIReference::isKnownAttribute(attrName)) { |
| bool isExternalReference = isExternalURIReference(href(), document()); |
| if (isExternalReference) { |
| URL url = document().completeURL(href()); |
| if (url.hasFragmentIdentifier()) { |
| CachedResourceRequest request(ResourceRequest(url.string())); |
| request.setInitiator(this); |
| setCachedDocument(document().cachedResourceLoader()->requestSVGDocument(request)); |
| } |
| } else |
| setCachedDocument(0); |
| |
| if (!m_wasInsertedByParser) |
| buildPendingResource(); |
| |
| return; |
| } |
| |
| if (!renderer) |
| return; |
| |
| if (SVGLangSpace::isKnownAttribute(attrName) |
| || SVGExternalResourcesRequired::isKnownAttribute(attrName)) { |
| invalidateShadowTree(); |
| return; |
| } |
| |
| ASSERT_NOT_REACHED(); |
| } |
| |
| bool SVGUseElement::willRecalcStyle(Style::Change) |
| { |
| if (!m_wasInsertedByParser && m_needsShadowTreeRecreation && renderer() && needsStyleRecalc()) |
| buildPendingResource(); |
| return true; |
| } |
| |
| #ifdef DUMP_INSTANCE_TREE |
| static void dumpInstanceTree(unsigned int& depth, String& text, SVGElementInstance* targetInstance) |
| { |
| SVGElement* element = targetInstance->correspondingElement(); |
| ASSERT(element); |
| |
| if (element->hasTagName(SVGNames::useTag)) { |
| if (toSVGUseElement(element)->cachedDocumentIsStillLoading()) |
| return; |
| } |
| |
| SVGElement* shadowTreeElement = targetInstance->shadowTreeElement(); |
| ASSERT(shadowTreeElement); |
| |
| SVGUseElement* directUseElement = targetInstance->directUseElement(); |
| String directUseElementName = directUseElement ? directUseElement->nodeName() : "null"; |
| |
| String elementId = element->getIdAttribute(); |
| String elementNodeName = element->nodeName(); |
| String shadowTreeElementNodeName = shadowTreeElement->nodeName(); |
| String parentNodeName = element->parentNode() ? element->parentNode()->nodeName() : "null"; |
| String firstChildNodeName = element->firstChild() ? element->firstChild()->nodeName() : "null"; |
| |
| for (unsigned int i = 0; i < depth; ++i) |
| text += " "; |
| |
| text += String::format("SVGElementInstance this=%p, (parentNode=%s (%p), firstChild=%s (%p), correspondingElement=%s (%p), directUseElement=%s (%p), shadowTreeElement=%s (%p), id=%s)\n", |
| targetInstance, parentNodeName.latin1().data(), element->parentNode(), firstChildNodeName.latin1().data(), element->firstChild(), |
| elementNodeName.latin1().data(), element, directUseElementName.latin1().data(), directUseElement, shadowTreeElementNodeName.latin1().data(), shadowTreeElement, elementId.latin1().data()); |
| |
| for (unsigned int i = 0; i < depth; ++i) |
| text += " "; |
| |
| const HashSet<SVGElementInstance*>& elementInstances = element->instancesForElement(); |
| text += "Corresponding element is associated with " + String::number(elementInstances.size()) + " instance(s):\n"; |
| |
| const HashSet<SVGElementInstance*>::const_iterator end = elementInstances.end(); |
| for (HashSet<SVGElementInstance*>::const_iterator it = elementInstances.begin(); it != end; ++it) { |
| for (unsigned int i = 0; i < depth; ++i) |
| text += " "; |
| |
| text += String::format(" -> SVGElementInstance this=%p, (refCount: %i, shadowTreeElement in document? %i)\n", |
| *it, (*it)->refCount(), (*it)->shadowTreeElement()->inDocument()); |
| } |
| |
| ++depth; |
| |
| for (SVGElementInstance* instance = targetInstance->firstChild(); instance; instance = instance->nextSibling()) |
| dumpInstanceTree(depth, text, instance); |
| |
| --depth; |
| } |
| #endif |
| |
| static bool isDisallowedElement(const Element& element) |
| { |
| // Spec: "Any 'svg', 'symbol', 'g', graphics element or other 'use' is potentially a template object that can be re-used |
| // (i.e., "instanced") in the SVG document via a 'use' element." |
| // "Graphics Element" is defined as 'circle', 'ellipse', 'image', 'line', 'path', 'polygon', 'polyline', 'rect', 'text' |
| // Excluded are anything that is used by reference or that only make sense to appear once in a document. |
| |
| if (!element.isSVGElement()) |
| return true; |
| |
| DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, allowedElementTags, ()); |
| if (allowedElementTags.isEmpty()) { |
| allowedElementTags.add(SVGNames::aTag); |
| allowedElementTags.add(SVGNames::circleTag); |
| allowedElementTags.add(SVGNames::descTag); |
| allowedElementTags.add(SVGNames::ellipseTag); |
| allowedElementTags.add(SVGNames::gTag); |
| allowedElementTags.add(SVGNames::imageTag); |
| allowedElementTags.add(SVGNames::lineTag); |
| allowedElementTags.add(SVGNames::metadataTag); |
| allowedElementTags.add(SVGNames::pathTag); |
| allowedElementTags.add(SVGNames::polygonTag); |
| allowedElementTags.add(SVGNames::polylineTag); |
| allowedElementTags.add(SVGNames::rectTag); |
| allowedElementTags.add(SVGNames::svgTag); |
| allowedElementTags.add(SVGNames::switchTag); |
| allowedElementTags.add(SVGNames::symbolTag); |
| allowedElementTags.add(SVGNames::textTag); |
| allowedElementTags.add(SVGNames::textPathTag); |
| allowedElementTags.add(SVGNames::titleTag); |
| allowedElementTags.add(SVGNames::trefTag); |
| allowedElementTags.add(SVGNames::tspanTag); |
| allowedElementTags.add(SVGNames::useTag); |
| } |
| return !allowedElementTags.contains<SVGAttributeHashTranslator>(element.tagQName()); |
| } |
| |
| static bool subtreeContainsDisallowedElement(SVGElement& start) |
| { |
| auto descendants = elementDescendants(start); |
| for (auto element = descendants.begin(), end = descendants.end(); element != end; ++element) { |
| if (isDisallowedElement(*element)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void SVGUseElement::clearResourceReferences() |
| { |
| // FIXME: We should try to optimize this, to at least allow partial reclones. |
| if (ShadowRoot* shadowTreeRootElement = shadowRoot()) |
| shadowTreeRootElement->removeChildren(); |
| |
| if (m_targetElementInstance) { |
| m_targetElementInstance->detach(); |
| m_targetElementInstance = 0; |
| } |
| |
| m_needsShadowTreeRecreation = false; |
| |
| document().accessSVGExtensions()->removeAllTargetReferencesForElement(this); |
| } |
| |
| void SVGUseElement::buildPendingResource() |
| { |
| if (!referencedDocument() || isInShadowTree()) |
| return; |
| clearResourceReferences(); |
| if (!inDocument()) |
| return; |
| |
| String id; |
| Element* target = SVGURIReference::targetElementFromIRIString(href(), document(), &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; |
| |
| referencedDocument()->accessSVGExtensions()->addPendingResource(id, this); |
| ASSERT(hasPendingResources()); |
| return; |
| } |
| |
| if (target->isSVGElement()) { |
| buildShadowAndInstanceTree(toSVGElement(target)); |
| invalidateDependentShadowTrees(); |
| } |
| |
| ASSERT(!m_needsShadowTreeRecreation); |
| } |
| |
| void SVGUseElement::buildShadowAndInstanceTree(SVGElement* target) |
| { |
| ASSERT(!m_targetElementInstance); |
| |
| // Do not build the shadow/instance tree for <use> elements living in a shadow tree. |
| // The will be expanded soon anyway - see expandUseElementsInShadowTree(). |
| if (isInShadowTree()) |
| return; |
| |
| // Do not allow self-referencing. |
| // 'target' may be null, if it's a non SVG namespaced element. |
| if (!target || target == this) |
| return; |
| |
| // Why a seperated instance/shadow tree? SVG demands it: |
| // The instance tree is accesable from JavaScript, and has to |
| // expose a 1:1 copy of the referenced tree, whereas internally we need |
| // to alter the tree for correct "use-on-symbol", "use-on-svg" support. |
| |
| // Build instance tree. Create root SVGElementInstance object for the first sub-tree node. |
| // |
| // Spec: If the 'use' element references a simple graphics element such as a 'rect', then there is only a |
| // single SVGElementInstance object, and the correspondingElement attribute on this SVGElementInstance object |
| // is the SVGRectElement that corresponds to the referenced 'rect' element. |
| m_targetElementInstance = SVGElementInstance::create(this, this, target); |
| |
| // Eventually enter recursion to build SVGElementInstance objects for the sub-tree children |
| bool foundProblem = false; |
| buildInstanceTree(target, m_targetElementInstance.get(), foundProblem, false); |
| |
| if (instanceTreeIsLoading(m_targetElementInstance.get())) |
| return; |
| |
| // 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 (foundProblem) { |
| clearResourceReferences(); |
| return; |
| } |
| |
| // Assure instance tree building was successfull |
| ASSERT(m_targetElementInstance); |
| ASSERT(!m_targetElementInstance->shadowTreeElement()); |
| ASSERT(m_targetElementInstance->correspondingUseElement() == this); |
| ASSERT(m_targetElementInstance->directUseElement() == this); |
| ASSERT(m_targetElementInstance->correspondingElement() == target); |
| |
| ShadowRoot* shadowTreeRootElement = shadowRoot(); |
| ASSERT(shadowTreeRootElement); |
| |
| // Build shadow tree from instance tree |
| // This also handles the special cases: <use> on <symbol>, <use> on <svg>. |
| buildShadowTree(target, m_targetElementInstance.get()); |
| |
| // Expand all <use> elements in the shadow tree. |
| // Expand means: replace the actual <use> element by what it references. |
| expandUseElementsInShadowTree(shadowTreeRootElement); |
| |
| // Expand all <symbol> elements in the shadow tree. |
| // Expand means: replace the actual <symbol> element by the <svg> element. |
| expandSymbolElementsInShadowTree(shadowTreeRootElement); |
| |
| // Now that the shadow tree is completly expanded, we can associate |
| // shadow tree elements <-> instances in the instance tree. |
| associateInstancesWithShadowTreeElements(shadowTreeRootElement->firstChild(), m_targetElementInstance.get()); |
| |
| // If no shadow tree element is present, this means that the reference root |
| // element was removed, as it is disallowed (ie. <use> on <foreignObject>) |
| // Do NOT leave an inconsistent instance tree around, instead destruct it. |
| if (!m_targetElementInstance->shadowTreeElement()) { |
| clearResourceReferences(); |
| return; |
| } |
| |
| ASSERT(m_targetElementInstance->shadowTreeElement()->parentNode() == shadowTreeRootElement); |
| |
| // Transfer event listeners assigned to the referenced element to our shadow tree elements. |
| transferEventListenersToShadowTree(m_targetElementInstance.get()); |
| |
| // Update relative length information. |
| updateRelativeLengthsInformation(); |
| |
| // Eventually dump instance tree |
| #ifdef DUMP_INSTANCE_TREE |
| String text; |
| unsigned int depth = 0; |
| |
| dumpInstanceTree(depth, text, m_targetElementInstance.get()); |
| fprintf(stderr, "\nDumping <use> instance tree:\n%s\n", text.latin1().data()); |
| #endif |
| |
| // Eventually dump shadow tree |
| #ifdef DUMP_SHADOW_TREE |
| RefPtr<XMLSerializer> serializer = XMLSerializer::create(); |
| String markup = serializer->serializeToString(shadowTreeRootElement, ASSERT_NO_EXCEPTION); |
| fprintf(stderr, "Dumping <use> shadow tree markup:\n%s\n", markup.latin1().data()); |
| #endif |
| } |
| |
| RenderElement* SVGUseElement::createRenderer(PassRef<RenderStyle> style) |
| { |
| return new RenderSVGTransformableContainer(*this, std::move(style)); |
| } |
| |
| static bool isDirectReference(const Node* node) |
| { |
| return node->hasTagName(SVGNames::pathTag) |
| || node->hasTagName(SVGNames::rectTag) |
| || node->hasTagName(SVGNames::circleTag) |
| || node->hasTagName(SVGNames::ellipseTag) |
| || node->hasTagName(SVGNames::polygonTag) |
| || node->hasTagName(SVGNames::polylineTag) |
| || node->hasTagName(SVGNames::textTag); |
| } |
| |
| void SVGUseElement::toClipPath(Path& path) |
| { |
| ASSERT(path.isEmpty()); |
| |
| Node* n = m_targetElementInstance ? m_targetElementInstance->shadowTreeElement() : 0; |
| if (!n) |
| return; |
| |
| if (n->isSVGElement() && toSVGElement(n)->isSVGGraphicsElement()) { |
| if (!isDirectReference(n)) |
| // Spec: Indirect references are an error (14.3.5) |
| document().accessSVGExtensions()->reportError("Not allowed to use indirect reference in <clip-path>"); |
| else { |
| toSVGGraphicsElement(n)->toClipPath(path); |
| // FIXME: Avoid manual resolution of x/y here. Its potentially harmful. |
| SVGLengthContext lengthContext(this); |
| path.translate(FloatSize(x().value(lengthContext), y().value(lengthContext))); |
| path.transform(animatedLocalTransform()); |
| } |
| } |
| } |
| |
| RenderElement* SVGUseElement::rendererClipChild() const |
| { |
| Node* n = m_targetElementInstance ? m_targetElementInstance->shadowTreeElement() : 0; |
| if (!n) |
| return 0; |
| |
| if (n->isSVGElement() && isDirectReference(n)) |
| return toSVGElement(n)->renderer(); |
| |
| return 0; |
| } |
| |
| void SVGUseElement::buildInstanceTree(SVGElement* target, SVGElementInstance* targetInstance, bool& foundProblem, bool foundUse) |
| { |
| ASSERT(target); |
| ASSERT(targetInstance); |
| |
| // Spec: If the referenced object is itself a 'use', or if there are 'use' subelements within the referenced |
| // object, the instance tree will contain recursive expansion of the indirect references to form a complete tree. |
| bool targetHasUseTag = target->hasTagName(SVGNames::useTag); |
| SVGElement* newTarget = 0; |
| if (targetHasUseTag) { |
| foundProblem = hasCycleUseReferencing(toSVGUseElement(target), targetInstance, newTarget); |
| if (foundProblem) |
| return; |
| |
| // We only need to track first degree <use> dependencies. Indirect references are handled |
| // as the invalidation bubbles up the dependency chain. |
| if (!foundUse) { |
| document().accessSVGExtensions()->addElementReferencingTarget(this, target); |
| foundUse = true; |
| } |
| } else if (isDisallowedElement(*target)) { |
| foundProblem = true; |
| return; |
| } |
| |
| // A general description from the SVG spec, describing what buildInstanceTree() actually does. |
| // |
| // Spec: If the 'use' element references a 'g' which contains two 'rect' elements, then the instance tree |
| // contains three SVGElementInstance objects, a root SVGElementInstance object whose correspondingElement |
| // is the SVGGElement object for the 'g', and then two child SVGElementInstance objects, each of which has |
| // its correspondingElement that is an SVGRectElement object. |
| |
| auto svgChildren = childrenOfType<SVGElement>(*target); |
| for (auto element = svgChildren.begin(), end = svgChildren.end(); element != end; ++element) { |
| // Skip any non-svg nodes or any disallowed element. |
| if (isDisallowedElement(*element)) |
| continue; |
| |
| // Create SVGElementInstance object, for both container/non-container nodes. |
| RefPtr<SVGElementInstance> instance = SVGElementInstance::create(this, 0, &*element); |
| SVGElementInstance* instancePtr = instance.get(); |
| targetInstance->appendChild(instance.release()); |
| |
| // Enter recursion, appending new instance tree nodes to the "instance" object. |
| buildInstanceTree(&*element, instancePtr, foundProblem, foundUse); |
| if (foundProblem) |
| return; |
| } |
| |
| if (!targetHasUseTag || !newTarget) |
| return; |
| |
| RefPtr<SVGElementInstance> newInstance = SVGElementInstance::create(this, toSVGUseElement(target), newTarget); |
| SVGElementInstance* newInstancePtr = newInstance.get(); |
| targetInstance->appendChild(newInstance.release()); |
| buildInstanceTree(newTarget, newInstancePtr, foundProblem, foundUse); |
| } |
| |
| bool SVGUseElement::hasCycleUseReferencing(SVGUseElement* use, SVGElementInstance* targetInstance, SVGElement*& newTarget) |
| { |
| ASSERT(referencedDocument()); |
| Element* targetElement = SVGURIReference::targetElementFromIRIString(use->href(), *referencedDocument()); |
| newTarget = 0; |
| if (targetElement && targetElement->isSVGElement()) |
| newTarget = toSVGElement(targetElement); |
| |
| if (!newTarget) |
| return false; |
| |
| // Shortcut for self-references |
| if (newTarget == this) |
| return true; |
| |
| AtomicString targetId = newTarget->getIdAttribute(); |
| SVGElementInstance* instance = targetInstance->parentNode(); |
| while (instance) { |
| SVGElement* element = instance->correspondingElement(); |
| |
| if (element->hasID() && element->getIdAttribute() == targetId && &element->document() == &newTarget->document()) |
| return true; |
| |
| instance = instance->parentNode(); |
| } |
| return false; |
| } |
| |
| static inline void removeDisallowedElementsFromSubtree(SVGElement& subtree) |
| { |
| ASSERT(!subtree.inDocument()); |
| Vector<Element*> toRemove; |
| auto it = elementDescendants(subtree).begin(); |
| auto end = elementDescendants(subtree).end(); |
| while (it != end) { |
| if (isDisallowedElement(*it)) { |
| toRemove.append(&*it); |
| it.traverseNextSkippingChildren(); |
| continue; |
| } |
| ++it; |
| } |
| // The subtree is not in document so this won't generate events that could mutate the tree. |
| for (unsigned i = 0; i < toRemove.size(); ++i) |
| toRemove[i]->parentNode()->removeChild(toRemove[i]); |
| } |
| |
| void SVGUseElement::buildShadowTree(SVGElement* target, SVGElementInstance* targetInstance) |
| { |
| ASSERT(target); // FIXME: Don't be a pointer! |
| |
| // For instance <use> on <foreignObject> (direct case). |
| if (isDisallowedElement(*target)) |
| return; |
| |
| RefPtr<SVGElement> newChild = static_pointer_cast<SVGElement>(targetInstance->correspondingElement()->cloneElementWithChildren()); |
| |
| // 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(*newChild)) |
| removeDisallowedElementsFromSubtree(*newChild); |
| |
| shadowRoot()->appendChild(newChild.release()); |
| } |
| |
| void SVGUseElement::expandUseElementsInShadowTree(Node* 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. Ie. if a <symbol> |
| // contains <use> tags, we'd miss them. So once we're done with settin' 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 (element->hasTagName(SVGNames::useTag)) { |
| SVGUseElement* use = toSVGUseElement(element); |
| ASSERT(!use->cachedDocumentIsStillLoading()); |
| |
| ASSERT(referencedDocument()); |
| Element* targetElement = SVGURIReference::targetElementFromIRIString(use->href(), *referencedDocument()); |
| SVGElement* target = 0; |
| if (targetElement && targetElement->isSVGElement()) |
| target = toSVGElement(targetElement); |
| |
| // Don't ASSERT(target) here, it may be "pending", too. |
| // Setup sub-shadow tree root node |
| RefPtr<SVGGElement> cloneParent = SVGGElement::create(SVGNames::gTag, *referencedDocument()); |
| use->cloneChildNodes(cloneParent.get()); |
| |
| // 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 && !isDisallowedElement(*target)) { |
| RefPtr<Element> newChild = target->cloneElementWithChildren(); |
| ASSERT(newChild->isSVGElement()); |
| 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)) |
| removeDisallowedElementsFromSubtree(*cloneParent); |
| |
| RefPtr<Node> 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 (RefPtr<Node> sibling = element->nextSibling(); sibling; sibling = sibling->nextSibling()) |
| expandUseElementsInShadowTree(sibling.get()); |
| } |
| |
| for (RefPtr<Node> child = element->firstChild(); child; child = child->nextSibling()) |
| expandUseElementsInShadowTree(child.get()); |
| } |
| |
| void SVGUseElement::expandSymbolElementsInShadowTree(Node* element) |
| { |
| if (element->hasTagName(SVGNames::symbolTag)) { |
| // Spec: The referenced 'symbol' and its contents are deep-cloned into the generated tree, |
| // with the exception that the 'symbol' is replaced by an 'svg'. This generated 'svg' will |
| // always have explicit values for attributes width and height. If attributes width and/or |
| // height are provided on the 'use' element, then these attributes will be transferred to |
| // the generated 'svg'. If attributes width and/or height are not specified, the generated |
| // 'svg' element will use values of 100% for these attributes. |
| RefPtr<SVGSVGElement> svgElement = SVGSVGElement::create(SVGNames::svgTag, *referencedDocument()); |
| |
| // Transfer all data (attributes, etc.) from <symbol> to the new <svg> element. |
| svgElement->cloneDataFromElement(*toElement(element)); |
| |
| // Only clone symbol children, and add them to the new <svg> element |
| for (Node* child = element->firstChild(); child; child = child->nextSibling()) { |
| RefPtr<Node> newChild = child->cloneNode(true); |
| svgElement->appendChild(newChild.release()); |
| } |
| |
| // We don't walk the target tree element-by-element, and clone each element, |
| // but instead use cloneNode(deep=true). 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(*svgElement)) |
| removeDisallowedElementsFromSubtree(*svgElement); |
| |
| RefPtr<Node> replacingElement(svgElement.get()); |
| |
| // Replace <symbol> with <svg>. |
| element->parentNode()->replaceChild(svgElement.release(), element); |
| |
| // 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 (RefPtr<Node> sibling = element->nextSibling(); sibling; sibling = sibling->nextSibling()) |
| expandSymbolElementsInShadowTree(sibling.get()); |
| } |
| |
| for (RefPtr<Node> child = element->firstChild(); child; child = child->nextSibling()) |
| expandSymbolElementsInShadowTree(child.get()); |
| } |
| |
| void SVGUseElement::transferEventListenersToShadowTree(SVGElementInstance* target) |
| { |
| if (!target) |
| return; |
| |
| SVGElement* originalElement = target->correspondingElement(); |
| ASSERT(originalElement); |
| |
| if (SVGElement* shadowTreeElement = target->shadowTreeElement()) { |
| if (EventTargetData* data = originalElement->eventTargetData()) |
| data->eventListenerMap.copyEventListenersNotCreatedFromMarkupToTarget(shadowTreeElement); |
| } |
| |
| for (SVGElementInstance* instance = target->firstChild(); instance; instance = instance->nextSibling()) |
| transferEventListenersToShadowTree(instance); |
| } |
| |
| void SVGUseElement::associateInstancesWithShadowTreeElements(Node* target, SVGElementInstance* targetInstance) |
| { |
| if (!target || !targetInstance) |
| return; |
| |
| SVGElement* originalElement = targetInstance->correspondingElement(); |
| |
| if (originalElement->hasTagName(SVGNames::useTag)) { |
| // <use> gets replaced by <g> |
| ASSERT(target->nodeName() == SVGNames::gTag); |
| } else if (originalElement->hasTagName(SVGNames::symbolTag)) { |
| // <symbol> gets replaced by <svg> |
| ASSERT(target->nodeName() == SVGNames::svgTag); |
| } else |
| ASSERT(target->nodeName() == originalElement->nodeName()); |
| |
| SVGElement* element = 0; |
| if (target->isSVGElement()) |
| element = toSVGElement(target); |
| |
| ASSERT(!targetInstance->shadowTreeElement()); |
| targetInstance->setShadowTreeElement(element); |
| element->setCorrespondingElement(originalElement); |
| |
| Node* node = target->firstChild(); |
| for (SVGElementInstance* instance = targetInstance->firstChild(); node && instance; instance = instance->nextSibling()) { |
| // Skip any non-svg elements in shadow tree |
| while (node && !node->isSVGElement()) |
| node = node->nextSibling(); |
| |
| if (!node) |
| break; |
| |
| associateInstancesWithShadowTreeElements(node, instance); |
| node = node->nextSibling(); |
| } |
| } |
| |
| SVGElementInstance* SVGUseElement::instanceForShadowTreeElement(Node* element) const |
| { |
| if (!m_targetElementInstance) { |
| ASSERT(!inDocument()); |
| return 0; |
| } |
| |
| return instanceForShadowTreeElement(element, m_targetElementInstance.get()); |
| } |
| |
| SVGElementInstance* SVGUseElement::instanceForShadowTreeElement(Node* element, SVGElementInstance* instance) const |
| { |
| ASSERT(element); |
| ASSERT(instance); |
| |
| // We're dispatching a mutation event during shadow tree construction |
| // this instance hasn't yet been associated to a shadowTree element. |
| if (!instance->shadowTreeElement()) |
| return 0; |
| |
| if (element == instance->shadowTreeElement()) |
| return instance; |
| |
| for (SVGElementInstance* current = instance->firstChild(); current; current = current->nextSibling()) { |
| if (SVGElementInstance* search = instanceForShadowTreeElement(element, current)) |
| return search; |
| } |
| |
| return 0; |
| } |
| |
| void SVGUseElement::invalidateShadowTree() |
| { |
| if (!renderer() || m_needsShadowTreeRecreation) |
| return; |
| m_needsShadowTreeRecreation = true; |
| setNeedsStyleRecalc(); |
| invalidateDependentShadowTrees(); |
| } |
| |
| void SVGUseElement::invalidateDependentShadowTrees() |
| { |
| // Recursively invalidate dependent <use> shadow trees |
| const HashSet<SVGElementInstance*>& instances = instancesForElement(); |
| const HashSet<SVGElementInstance*>::const_iterator end = instances.end(); |
| for (HashSet<SVGElementInstance*>::const_iterator it = instances.begin(); it != end; ++it) { |
| if (SVGUseElement* element = (*it)->correspondingUseElement()) { |
| ASSERT(element->inDocument()); |
| element->invalidateShadowTree(); |
| } |
| } |
| } |
| |
| void SVGUseElement::transferUseAttributesToReplacedElement(SVGElement* from, SVGElement* to) const |
| { |
| ASSERT(from); |
| ASSERT(to); |
| |
| to->cloneDataFromElement(*from); |
| |
| to->removeAttribute(SVGNames::xAttr); |
| to->removeAttribute(SVGNames::yAttr); |
| to->removeAttribute(SVGNames::widthAttr); |
| to->removeAttribute(SVGNames::heightAttr); |
| to->removeAttribute(XLinkNames::hrefAttr); |
| } |
| |
| bool SVGUseElement::selfHasRelativeLengths() const |
| { |
| if (x().isRelative() |
| || y().isRelative() |
| || width().isRelative() |
| || height().isRelative()) |
| return true; |
| |
| if (!m_targetElementInstance) |
| return false; |
| |
| SVGElement* element = m_targetElementInstance->correspondingElement(); |
| if (!element) |
| return false; |
| |
| return element->hasRelativeLengths(); |
| } |
| |
| void SVGUseElement::notifyFinished(CachedResource* resource) |
| { |
| if (!inDocument()) |
| return; |
| |
| invalidateShadowTree(); |
| if (resource->errorOccurred()) |
| dispatchEvent(Event::create(eventNames().errorEvent, false, false)); |
| else if (!resource->wasCanceled()) |
| SVGExternalResourcesRequired::dispatchLoadEvent(this); |
| } |
| |
| bool SVGUseElement::cachedDocumentIsStillLoading() |
| { |
| if (m_cachedDocument && m_cachedDocument->isLoading()) |
| return true; |
| return false; |
| } |
| |
| bool SVGUseElement::instanceTreeIsLoading(SVGElementInstance* targetElementInstance) |
| { |
| for (SVGElementInstance* instance = targetElementInstance->firstChild(); instance; instance = instance->nextSibling()) { |
| if (SVGUseElement* use = instance->correspondingUseElement()) { |
| if (use->cachedDocumentIsStillLoading()) |
| return true; |
| } |
| if (instance->hasChildNodes()) |
| instanceTreeIsLoading(instance); |
| } |
| return false; |
| } |
| |
| void SVGUseElement::finishParsingChildren() |
| { |
| SVGGraphicsElement::finishParsingChildren(); |
| SVGExternalResourcesRequired::finishParsingChildren(); |
| if (m_wasInsertedByParser) { |
| buildPendingResource(); |
| m_wasInsertedByParser = false; |
| } |
| } |
| |
| void SVGUseElement::setCachedDocument(CachedResourceHandle<CachedSVGDocument> cachedDocument) |
| { |
| if (m_cachedDocument == cachedDocument) |
| return; |
| |
| if (m_cachedDocument) |
| m_cachedDocument->removeClient(this); |
| |
| m_cachedDocument = cachedDocument; |
| if (m_cachedDocument) |
| m_cachedDocument->addClient(this); |
| } |
| |
| } |
| |
| #endif // ENABLE(SVG) |
