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      1 /*
      2  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis (at) kde.org>
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #ifndef SVGUseElement_h
     22 #define SVGUseElement_h
     23 
     24 #include "core/SVGNames.h"
     25 #include "core/fetch/DocumentResource.h"
     26 #include "core/svg/SVGAnimatedBoolean.h"
     27 #include "core/svg/SVGAnimatedLength.h"
     28 #include "core/svg/SVGGraphicsElement.h"
     29 #include "core/svg/SVGURIReference.h"
     30 
     31 namespace blink {
     32 
     33 class DocumentResource;
     34 
     35 class SVGUseElement FINAL : public SVGGraphicsElement,
     36                             public SVGURIReference,
     37                             public DocumentResourceClient {
     38     DEFINE_WRAPPERTYPEINFO();
     39 public:
     40     static PassRefPtrWillBeRawPtr<SVGUseElement> create(Document&);
     41     virtual ~SVGUseElement();
     42 
     43     void invalidateShadowTree();
     44 
     45     RenderObject* rendererClipChild() const;
     46 
     47     SVGAnimatedLength* x() const { return m_x.get(); }
     48     SVGAnimatedLength* y() const { return m_y.get(); }
     49     SVGAnimatedLength* width() const { return m_width.get(); }
     50     SVGAnimatedLength* height() const { return m_height.get(); }
     51 
     52     virtual void buildPendingResource() OVERRIDE;
     53 
     54     virtual void trace(Visitor*) OVERRIDE;
     55 
     56 private:
     57     explicit SVGUseElement(Document&);
     58 
     59     virtual bool isStructurallyExternal() const OVERRIDE { return !hrefString().isNull() && isExternalURIReference(hrefString(), document()); }
     60 
     61     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     62     virtual void removedFrom(ContainerNode*) OVERRIDE;
     63 
     64     bool isSupportedAttribute(const QualifiedName&);
     65     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     66     virtual void svgAttributeChanged(const QualifiedName&) OVERRIDE;
     67 
     68     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
     69     virtual void toClipPath(Path&) OVERRIDE;
     70 
     71     void clearResourceReferences();
     72     void buildShadowAndInstanceTree(SVGElement* target);
     73 
     74     void scheduleShadowTreeRecreation();
     75     virtual bool haveLoadedRequiredResources() OVERRIDE { return !isStructurallyExternal() || m_haveFiredLoadEvent; }
     76 
     77     virtual bool selfHasRelativeLengths() const OVERRIDE;
     78 
     79     // Instance tree handling
     80     bool buildShadowTree(SVGElement* target, SVGElement* targetInstance, bool foundUse);
     81     bool hasCycleUseReferencing(SVGUseElement*, ContainerNode* targetInstance, SVGElement*& newTarget);
     82     bool expandUseElementsInShadowTree(SVGElement*);
     83     void expandSymbolElementsInShadowTree(SVGElement*);
     84 
     85     void transferUseAttributesToReplacedElement(SVGElement* from, SVGElement* to) const;
     86 
     87     void invalidateDependentShadowTrees();
     88 
     89     bool resourceIsStillLoading();
     90     Document* externalDocument() const;
     91     bool instanceTreeIsLoading(SVGElement*);
     92     virtual void notifyFinished(Resource*) OVERRIDE;
     93     TreeScope* referencedScope() const;
     94     void setDocumentResource(ResourcePtr<DocumentResource>);
     95 
     96     virtual Timer<SVGElement>* svgLoadEventTimer() OVERRIDE { return &m_svgLoadEventTimer; }
     97 
     98     RefPtr<SVGAnimatedLength> m_x;
     99     RefPtr<SVGAnimatedLength> m_y;
    100     RefPtr<SVGAnimatedLength> m_width;
    101     RefPtr<SVGAnimatedLength> m_height;
    102 
    103     bool m_haveFiredLoadEvent;
    104     bool m_needsShadowTreeRecreation;
    105     RefPtrWillBeMember<SVGElement> m_targetElementInstance;
    106     ResourcePtr<DocumentResource> m_resource;
    107     Timer<SVGElement> m_svgLoadEventTimer;
    108 };
    109 
    110 } // namespace blink
    111 
    112 #endif // SVGUseElement_h
    113