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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 #if ENABLE(SVG)
     25 #include "SVGAnimatedBoolean.h"
     26 #include "SVGAnimatedLength.h"
     27 #include "SVGExternalResourcesRequired.h"
     28 #include "SVGLangSpace.h"
     29 #include "SVGStyledTransformableElement.h"
     30 #include "SVGTests.h"
     31 #include "SVGURIReference.h"
     32 
     33 namespace WebCore {
     34 
     35 class SVGElementInstance;
     36 class SVGShadowTreeRootElement;
     37 
     38 class SVGUseElement : public SVGStyledTransformableElement,
     39                       public SVGTests,
     40                       public SVGLangSpace,
     41                       public SVGExternalResourcesRequired,
     42                       public SVGURIReference {
     43 public:
     44     static PassRefPtr<SVGUseElement> create(const QualifiedName&, Document*);
     45 
     46     SVGElementInstance* instanceRoot() const;
     47     SVGElementInstance* animatedInstanceRoot() const;
     48     SVGElementInstance* instanceForShadowTreeElement(Node*) const;
     49     void invalidateShadowTree();
     50 
     51     RenderObject* rendererClipChild() const;
     52 
     53 private:
     54     SVGUseElement(const QualifiedName&, Document*);
     55 
     56     virtual bool isValid() const { return SVGTests::isValid(); }
     57 
     58     virtual void insertedIntoDocument();
     59     virtual void removedFromDocument();
     60     virtual void buildPendingResource();
     61 
     62     virtual void parseMappedAttribute(Attribute*);
     63     virtual void svgAttributeChanged(const QualifiedName&);
     64     virtual void synchronizeProperty(const QualifiedName&);
     65     virtual void fillAttributeToPropertyTypeMap();
     66     virtual AttributeToPropertyTypeMap& attributeToPropertyTypeMap();
     67 
     68     virtual void recalcStyle(StyleChange = NoChange);
     69     virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
     70     virtual void attach();
     71     virtual void detach();
     72 
     73     virtual void toClipPath(Path&) const;
     74 
     75     static void removeDisallowedElementsFromSubtree(Node* element);
     76 
     77     void setUpdatesBlocked(bool blocked) { m_updatesBlocked = blocked; }
     78 
     79     friend class RenderSVGShadowTreeRootContainer;
     80     bool isPendingResource() const { return m_isPendingResource; }
     81     void buildShadowAndInstanceTree(SVGShadowTreeRootElement*);
     82     void detachInstance();
     83 
     84     virtual bool selfHasRelativeLengths() const;
     85 
     86     // Instance tree handling
     87     void buildInstanceTree(SVGElement* target, SVGElementInstance* targetInstance, bool& foundCycle);
     88     bool hasCycleUseReferencing(SVGUseElement*, SVGElementInstance* targetInstance, SVGElement*& newTarget);
     89 
     90     // Shadow tree handling
     91     void buildShadowTree(SVGShadowTreeRootElement*, SVGElement* target, SVGElementInstance* targetInstance);
     92 
     93 #if ENABLE(SVG) && ENABLE(SVG_USE)
     94     void expandUseElementsInShadowTree(Node* element);
     95     void expandSymbolElementsInShadowTree(Node* element);
     96 #endif
     97 
     98     // "Tree connector"
     99     void associateInstancesWithShadowTreeElements(Node* target, SVGElementInstance* targetInstance);
    100     SVGElementInstance* instanceForShadowTreeElement(Node* element, SVGElementInstance* instance) const;
    101 
    102     void transferUseAttributesToReplacedElement(SVGElement* from, SVGElement* to) const;
    103     void transferEventListenersToShadowTree(SVGElementInstance* target);
    104 
    105     void updateContainerOffsets();
    106     void updateContainerSizes();
    107 
    108     // Animated property declarations
    109     DECLARE_ANIMATED_LENGTH(X, x)
    110     DECLARE_ANIMATED_LENGTH(Y, y)
    111     DECLARE_ANIMATED_LENGTH(Width, width)
    112     DECLARE_ANIMATED_LENGTH(Height, height)
    113 
    114     // SVGURIReference
    115     DECLARE_ANIMATED_STRING(Href, href)
    116 
    117     // SVGExternalResourcesRequired
    118     DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
    119 
    120     bool m_updatesBlocked;
    121     bool m_isPendingResource;
    122     bool m_needsShadowTreeRecreation;
    123     String m_resourceId;
    124     RefPtr<SVGElementInstance> m_targetElementInstance;
    125 };
    126 
    127 }
    128 
    129 #endif
    130 #endif
    131