| /* |
| * 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" |
| |
| #include "core/svg/SVGUseElement.h" |
| |
| #include "bindings/core/v8/ExceptionStatePlaceholder.h" |
| #include "core/SVGNames.h" |
| #include "core/XLinkNames.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/ElementTraversal.h" |
| #include "core/events/Event.h" |
| #include "core/dom/shadow/ElementShadow.h" |
| #include "core/dom/shadow/ShadowRoot.h" |
| #include "core/fetch/FetchRequest.h" |
| #include "core/fetch/ResourceFetcher.h" |
| #include "core/layout/svg/LayoutSVGTransformableContainer.h" |
| #include "core/svg/SVGGElement.h" |
| #include "core/svg/SVGLengthContext.h" |
| #include "core/svg/SVGSVGElement.h" |
| #include "core/xml/parser/XMLDocumentParser.h" |
| |
| namespace blink { |
| |
| static SVGUseEventSender& svgUseLoadEventSender() |
| { |
| DEFINE_STATIC_LOCAL(SVGUseEventSender, sharedLoadEventSender, (EventTypeNames::load)); |
| return sharedLoadEventSender; |
| } |
| |
| inline SVGUseElement::SVGUseElement(Document& document) |
| : SVGGraphicsElement(SVGNames::useTag, document) |
| , SVGURIReference(this) |
| , m_x(SVGAnimatedLength::create(this, SVGNames::xAttr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths)) |
| , m_y(SVGAnimatedLength::create(this, SVGNames::yAttr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths)) |
| , m_width(SVGAnimatedLength::create(this, SVGNames::widthAttr, SVGLength::create(SVGLengthMode::Width), ForbidNegativeLengths)) |
| , m_height(SVGAnimatedLength::create(this, SVGNames::heightAttr, SVGLength::create(SVGLengthMode::Height), ForbidNegativeLengths)) |
| , m_haveFiredLoadEvent(false) |
| , m_needsShadowTreeRecreation(false) |
| { |
| ASSERT(hasCustomStyleCallbacks()); |
| |
| addToPropertyMap(m_x); |
| addToPropertyMap(m_y); |
| addToPropertyMap(m_width); |
| addToPropertyMap(m_height); |
| } |
| |
| PassRefPtrWillBeRawPtr<SVGUseElement> SVGUseElement::create(Document& document) |
| { |
| // Always build a user agent #shadow-root for SVGUseElement. |
| RefPtrWillBeRawPtr<SVGUseElement> use = adoptRefWillBeNoop(new SVGUseElement(document)); |
| use->ensureUserAgentShadowRoot(); |
| return use.release(); |
| } |
| |
| SVGUseElement::~SVGUseElement() |
| { |
| setDocumentResource(0); |
| #if !ENABLE(OILPAN) |
| clearShadowTree(); |
| cancelShadowTreeRecreation(); |
| #endif |
| svgUseLoadEventSender().cancelEvent(this); |
| } |
| |
| DEFINE_TRACE(SVGUseElement) |
| { |
| visitor->trace(m_x); |
| visitor->trace(m_y); |
| visitor->trace(m_width); |
| visitor->trace(m_height); |
| visitor->trace(m_targetElementInstance); |
| SVGGraphicsElement::trace(visitor); |
| SVGURIReference::trace(visitor); |
| } |
| |
| #if ENABLE(ASSERT) |
| static inline bool isWellFormedDocument(Document* document) |
| { |
| if (document->isXMLDocument()) |
| 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())); |
| invalidateShadowTree(); |
| return InsertionDone; |
| } |
| |
| void SVGUseElement::removedFrom(ContainerNode* rootParent) |
| { |
| SVGGraphicsElement::removedFrom(rootParent); |
| if (rootParent->inDocument()) { |
| clearShadowTree(); |
| cancelShadowTreeRecreation(); |
| } |
| } |
| |
| TreeScope* SVGUseElement::referencedScope() const |
| { |
| if (isStructurallyExternal()) |
| return externalDocument(); |
| return &treeScope(); |
| } |
| |
| Document* SVGUseElement::externalDocument() const |
| { |
| if (m_resource && m_resource->isLoaded()) { |
| // Gracefully handle error condition. |
| if (m_resource->errorOccurred()) |
| return nullptr; |
| ASSERT(m_resource->document()); |
| return m_resource->document(); |
| } |
| return nullptr; |
| } |
| |
| void transferUseWidthAndHeightIfNeeded(const SVGUseElement& use, SVGElement* shadowElement, const SVGElement& originalElement) |
| { |
| DEFINE_STATIC_LOCAL(const AtomicString, hundredPercentString, ("100%", AtomicString::ConstructFromLiteral)); |
| ASSERT(shadowElement); |
| if (isSVGSymbolElement(*shadowElement)) { |
| // Spec (<use> on <symbol>): 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. |
| shadowElement->setAttribute(SVGNames::widthAttr, use.width()->isSpecified() ? AtomicString(use.width()->currentValue()->valueAsString()) : hundredPercentString); |
| shadowElement->setAttribute(SVGNames::heightAttr, use.height()->isSpecified() ? AtomicString(use.height()->currentValue()->valueAsString()) : hundredPercentString); |
| } else if (isSVGSVGElement(*shadowElement)) { |
| // Spec (<use> on <svg>): If attributes width and/or height are provided on the 'use' element, then these |
| // values will override the corresponding attributes on the 'svg' in the generated tree. |
| if (use.width()->isSpecified()) |
| shadowElement->setAttribute(SVGNames::widthAttr, AtomicString(use.width()->currentValue()->valueAsString())); |
| else |
| shadowElement->setAttribute(SVGNames::widthAttr, originalElement.getAttribute(SVGNames::widthAttr)); |
| if (use.height()->isSpecified()) |
| shadowElement->setAttribute(SVGNames::heightAttr, AtomicString(use.height()->currentValue()->valueAsString())); |
| else |
| shadowElement->setAttribute(SVGNames::heightAttr, originalElement.getAttribute(SVGNames::heightAttr)); |
| } |
| } |
| |
| bool SVGUseElement::isPresentationAttribute(const QualifiedName& attrName) const |
| { |
| if (attrName == SVGNames::xAttr || attrName == SVGNames::yAttr) |
| return true; |
| return SVGGraphicsElement::isPresentationAttribute(attrName); |
| } |
| |
| bool SVGUseElement::isPresentationAttributeWithSVGDOM(const QualifiedName& attrName) const |
| { |
| if (attrName == SVGNames::xAttr || attrName == SVGNames::yAttr) |
| return true; |
| return SVGGraphicsElement::isPresentationAttributeWithSVGDOM(attrName); |
| } |
| |
| void SVGUseElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style) |
| { |
| RefPtrWillBeRawPtr<SVGAnimatedPropertyBase> property = propertyFromAttribute(name); |
| if (property == m_x) |
| addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyX, *m_x->currentValue()); |
| else if (property == m_y) |
| addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyY, *m_y->currentValue()); |
| else |
| SVGGraphicsElement::collectStyleForPresentationAttribute(name, value, style); |
| } |
| |
| 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()); |
| if (url.hasFragmentIdentifier()) { |
| FetchRequest request(ResourceRequest(url), localName()); |
| setDocumentResource(DocumentResource::fetchSVGDocument(request, document().fetcher())); |
| } |
| } else { |
| setDocumentResource(0); |
| } |
| |
| invalidateShadowTree(); |
| |
| return; |
| } |
| |
| SVGGraphicsElement::svgAttributeChanged(attrName); |
| } |
| |
| static bool isDisallowedElement(Node* node) |
| { |
| // 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. |
| // We must also allow the shadow roots of other use elements. |
| if (node->isShadowRoot() || node->isTextNode()) |
| return false; |
| |
| if (!node->isSVGElement()) |
| return true; |
| |
| Element* element = toElement(node); |
| |
| 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::tspanTag); |
| allowedElementTags.add(SVGNames::useTag); |
| } |
| return !allowedElementTags.contains<SVGAttributeHashTranslator>(element->tagQName()); |
| } |
| |
| static bool subtreeContainsDisallowedElement(Node* start) |
| { |
| if (isDisallowedElement(start)) |
| return true; |
| |
| for (Node* cur = start->firstChild(); cur; cur = cur->nextSibling()) { |
| if (subtreeContainsDisallowedElement(cur)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void SVGUseElement::scheduleShadowTreeRecreation() |
| { |
| if (inUseShadowTree()) |
| return; |
| m_needsShadowTreeRecreation = true; |
| document().scheduleUseShadowTreeUpdate(*this); |
| } |
| |
| void SVGUseElement::cancelShadowTreeRecreation() |
| { |
| m_needsShadowTreeRecreation = false; |
| document().unscheduleUseShadowTreeUpdate(*this); |
| } |
| |
| void SVGUseElement::clearInstanceRoot() |
| { |
| if (m_targetElementInstance) |
| m_targetElementInstance = nullptr; |
| } |
| |
| void SVGUseElement::clearShadowTree() |
| { |
| clearInstanceRoot(); |
| |
| // FIXME: We should try to optimize this, to at least allow partial reclones. |
| if (ShadowRoot* shadowTreeRootElement = userAgentShadowRoot()) |
| shadowTreeRootElement->removeChildren(OmitSubtreeModifiedEvent); |
| |
| removeAllOutgoingReferences(); |
| } |
| |
| 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); |
| } |
| |
| static PassRefPtrWillBeRawPtr<Node> cloneNodeAndAssociate(Node& toClone) |
| { |
| RefPtrWillBeRawPtr<Node> clone = toClone.cloneNode(false); |
| if (!clone->isSVGElement()) |
| return clone.release(); |
| |
| SVGElement& svgElement = toSVGElement(toClone); |
| ASSERT(!svgElement.correspondingElement()); |
| toSVGElement(clone.get())->setCorrespondingElement(&svgElement); |
| if (EventTargetData* data = toClone.eventTargetData()) |
| data->eventListenerMap.copyEventListenersNotCreatedFromMarkupToTarget(clone.get()); |
| TrackExceptionState exceptionState; |
| for (Node* node = toClone.firstChild(); node && !exceptionState.hadException(); node = node->nextSibling()) |
| clone->appendChild(cloneNodeAndAssociate(*node), exceptionState); |
| return clone.release(); |
| } |
| |
| 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(); |
| } |
| |
| LayoutObject* SVGUseElement::createLayoutObject(const ComputedStyle&) |
| { |
| return new LayoutSVGTransformableContainer(this); |
| } |
| |
| static bool isDirectReference(const SVGElement& element) |
| { |
| return isSVGPathElement(element) |
| || isSVGRectElement(element) |
| || isSVGCircleElement(element) |
| || isSVGEllipseElement(element) |
| || isSVGPolygonElement(element) |
| || isSVGPolylineElement(element) |
| || isSVGTextElement(element); |
| } |
| |
| void SVGUseElement::toClipPath(Path& path) const |
| { |
| ASSERT(path.isEmpty()); |
| |
| const SVGGraphicsElement* element = targetGraphicsElementForClipping(); |
| |
| if (!element) |
| return; |
| |
| if (element->isSVGGeometryElement()) { |
| toSVGGeometryElement(*element).toClipPath(path); |
| // FIXME: Avoid manual resolution of x/y here. Its potentially harmful. |
| SVGLengthContext lengthContext(this); |
| path.translate(FloatSize(m_x->currentValue()->value(lengthContext), m_y->currentValue()->value(lengthContext))); |
| path.transform(calculateAnimatedLocalTransform()); |
| } |
| } |
| |
| SVGGraphicsElement* SVGUseElement::targetGraphicsElementForClipping() const |
| { |
| Node* n = userAgentShadowRoot()->firstChild(); |
| if (!n || !n->isSVGElement()) |
| return nullptr; |
| |
| SVGElement& element = toSVGElement(*n); |
| |
| if (!element.isSVGGraphicsElement()) |
| return nullptr; |
| |
| // Spec: "If a <use> element is a child of a clipPath element, it must directly |
| // reference <path>, <text> or basic shapes elements. Indirect references are an |
| // error and the clipPath element must be ignored." |
| // http://dev.w3.org/fxtf/css-masking-1/#the-clip-path |
| if (!isDirectReference(element)) { |
| // Spec: Indirect references are an error (14.3.5) |
| document().accessSVGExtensions().reportError("Not allowed to use indirect reference in <clip-path>"); |
| return nullptr; |
| } |
| |
| return &toSVGGraphicsElement(element); |
| } |
| |
| bool SVGUseElement::buildShadowTree(SVGElement* target, SVGElement* targetInstance, 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. |
| if (isSVGUseElement(*target)) { |
| // We only need to track first degree <use> dependencies. Indirect references are handled |
| // as the invalidation bubbles up the dependency chain. |
| if (!foundUse && !isStructurallyExternal()) { |
| addReferenceTo(target); |
| foundUse = true; |
| } |
| } else if (isDisallowedElement(target)) { |
| return false; |
| } |
| |
| targetInstance->setCorrespondingElement(target); |
| if (EventTargetData* data = target->eventTargetData()) |
| data->eventListenerMap.copyEventListenersNotCreatedFromMarkupToTarget(targetInstance); |
| |
| for (Node* child = target->firstChild(); child; child = child->nextSibling()) { |
| // Skip any disallowed element. |
| if (isDisallowedElement(child)) |
| continue; |
| |
| RefPtrWillBeRawPtr<Node> newChild = child->cloneNode(false); |
| targetInstance->appendChild(newChild.get()); |
| if (newChild->isSVGElement()) { |
| // Enter recursion, appending new instance tree nodes to the "instance" object. |
| if (!buildShadowTree(toSVGElement(child), toSVGElement(newChild), foundUse)) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool SVGUseElement::hasCycleUseReferencing(SVGUseElement* use, ContainerNode* targetInstance, SVGElement*& newTarget) |
| { |
| ASSERT(referencedScope()); |
| Element* targetElement = SVGURIReference::targetElementFromIRIString(use->hrefString(), *referencedScope()); |
| 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(); |
| ContainerNode* instance = targetInstance->parentNode(); |
| while (instance && instance->isSVGElement()) { |
| SVGElement* element = toSVGElement(instance); |
| if (element->hasID() && element->getIdAttribute() == targetId && element->document() == newTarget->document()) |
| return true; |
| |
| instance = instance->parentNode(); |
| } |
| return false; |
| } |
| |
| static inline void removeDisallowedElementsFromSubtree(Element& subtree) |
| { |
| ASSERT(!subtree.inDocument()); |
| Element* element = ElementTraversal::firstWithin(subtree); |
| while (element) { |
| if (isDisallowedElement(element)) { |
| Element* next = ElementTraversal::nextSkippingChildren(*element, &subtree); |
| // The subtree is not in document so this won't generate events that could mutate the tree. |
| element->parentNode()->removeChild(element); |
| element = next; |
| } else { |
| element = ElementTraversal::next(*element, &subtree); |
| } |
| } |
| } |
| |
| 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 (Node* child = use->firstChild(); child; ) { |
| Node* nextChild = child->nextSibling(); |
| cloneParent->appendChild(child); |
| child = nextChild; |
| } |
| |
| // 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; |
| } |
| |
| void SVGUseElement::expandSymbolElementsInShadowTree(SVGElement* element) |
| { |
| ASSERT(element); |
| if (isSVGSymbolElement(*element)) { |
| // 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. |
| ASSERT(referencedScope()); |
| RefPtrWillBeRawPtr<SVGSVGElement> svgElement = SVGSVGElement::create(referencedScope()->document()); |
| // Transfer all data (attributes, etc.) from <symbol> to the new <svg> element. |
| svgElement->cloneDataFromElement(*element); |
| svgElement->setCorrespondingElement(element->correspondingElement()); |
| |
| // Move already cloned elements to the new <svg> element |
| for (Node* child = element->firstChild(); child; ) { |
| Node* nextChild = child->nextSibling(); |
| svgElement->appendChild(child); |
| child = nextChild; |
| } |
| |
| // 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.get())) |
| removeDisallowedElementsFromSubtree(*svgElement); |
| |
| RefPtrWillBeRawPtr<SVGElement> replacingElement(svgElement.get()); |
| |
| // Replace <symbol> with <svg>. |
| ASSERT(element->parentNode()); |
| 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 (RefPtrWillBeRawPtr<SVGElement> child = Traversal<SVGElement>::firstChild(*element); child; child = Traversal<SVGElement>::nextSibling(*child)) |
| expandSymbolElementsInShadowTree(child.get()); |
| } |
| |
| void SVGUseElement::invalidateShadowTree() |
| { |
| if (!inActiveDocument() || m_needsShadowTreeRecreation) |
| return; |
| clearInstanceRoot(); |
| scheduleShadowTreeRecreation(); |
| invalidateDependentShadowTrees(); |
| } |
| |
| void SVGUseElement::invalidateDependentShadowTrees() |
| { |
| // Recursively invalidate dependent <use> shadow trees |
| const WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement>>& instances = instancesForElement(); |
| for (SVGElement* instance : instances) { |
| if (SVGUseElement* element = instance->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 (m_x->currentValue()->isRelative() |
| || m_y->currentValue()->isRelative() |
| || m_width->currentValue()->isRelative() |
| || m_height->currentValue()->isRelative()) |
| return true; |
| |
| if (!m_targetElementInstance) |
| return false; |
| |
| return m_targetElementInstance->hasRelativeLengths(); |
| } |
| |
| FloatRect SVGUseElement::getBBox() |
| { |
| document().updateLayoutIgnorePendingStylesheets(); |
| |
| if (!layoutObject()) |
| return FloatRect(); |
| |
| LayoutSVGTransformableContainer& transformableContainer = toLayoutSVGTransformableContainer(*layoutObject()); |
| // Don't apply the additional translation if the oBB is invalid. |
| if (!transformableContainer.isObjectBoundingBoxValid()) |
| return FloatRect(); |
| |
| // TODO(fs): Preferably this would just use objectBoundingBox() (and hence |
| // don't need to override SVGGraphicsElement::getBBox at all) and be |
| // correct without additional work. That will not work out ATM without |
| // additional quirks. The problem stems from including the additional |
| // translation directly on the LayoutObject corresponding to the |
| // SVGUseElement. |
| FloatRect bbox = transformableContainer.objectBoundingBox(); |
| bbox.move(transformableContainer.additionalTranslation()); |
| return bbox; |
| } |
| |
| void SVGUseElement::dispatchPendingEvent(SVGUseEventSender* eventSender) |
| { |
| ASSERT_UNUSED(eventSender, eventSender == &svgUseLoadEventSender()); |
| ASSERT(isStructurallyExternal() && m_haveFiredLoadEvent); |
| dispatchEvent(Event::create(EventTypeNames::load)); |
| } |
| |
| void SVGUseElement::notifyFinished(Resource* resource) |
| { |
| if (!inDocument()) |
| return; |
| |
| invalidateShadowTree(); |
| if (resource->errorOccurred()) |
| dispatchEvent(Event::create(EventTypeNames::error)); |
| else if (!resource->wasCanceled()) { |
| if (m_haveFiredLoadEvent) |
| return; |
| if (!isStructurallyExternal()) |
| return; |
| ASSERT(!m_haveFiredLoadEvent); |
| m_haveFiredLoadEvent = true; |
| svgUseLoadEventSender().dispatchEventSoon(this); |
| } |
| } |
| |
| bool SVGUseElement::resourceIsStillLoading() |
| { |
| if (m_resource && m_resource->isLoading()) |
| return true; |
| return false; |
| } |
| |
| bool SVGUseElement::instanceTreeIsLoading(SVGElement* targetInstance) |
| { |
| for (SVGElement* element = Traversal<SVGElement>::firstChild(*targetInstance); element; element = Traversal<SVGElement>::nextSibling(*element)) { |
| if (SVGUseElement* use = element->correspondingUseElement()) { |
| if (use->resourceIsStillLoading()) |
| return true; |
| } |
| if (element->hasChildren() && instanceTreeIsLoading(element)) |
| return true; |
| } |
| return false; |
| } |
| |
| void SVGUseElement::setDocumentResource(ResourcePtr<DocumentResource> resource) |
| { |
| if (m_resource == resource) |
| return; |
| |
| if (m_resource) |
| m_resource->removeClient(this); |
| |
| m_resource = resource; |
| if (m_resource) |
| m_resource->addClient(this); |
| } |
| |
| } |
