khtml/svg/SVGElementInstance.h

   1 /*
   2     Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
   3
   4     This file is part of the KDE project
   5
   6     This library is free software; you can redistribute it and/or
   7     modify it under the terms of the GNU Library General Public
   8     License as published by the Free Software Foundation; either
   9     version 2 of the License, or (at your option) any later version.
  10
  11     This library is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14     Library General Public License for more details.
  15
  16     You should have received a copy of the GNU Library General Public License
  17     along with this library; see the file COPYING.LIB.  If not, write to
  18     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19     Boston, MA 02110-1301, USA.
  20 */
  21
  22 #ifndef SVGElementInstance_h
  23 #define SVGElementInstance_h
  24
  25 #if ENABLE(SVG)
  26
  27 /*#include "EventTarget.h"*/
  28 #include "Document.h" //khtml
  29
  30 #include <wtf/RefPtr.h>
  31 #include <wtf/PassRefPtr.h>
  32
  33 namespace WebCore {
  34     class SVGElement;
  35     class SVGUseElement;
  36     class SVGElementInstanceList;
  37
  38     class SVGElementInstance /*: public EventTarget*/ {
  39     public:
  40         SVGElementInstance(SVGUseElement*, PassRefPtr<SVGElement> originalElement);
  41         virtual ~SVGElementInstance();
  42
  43         // 'SVGElementInstance' functions
  44         SVGElement* correspondingElement() const;
  45         SVGUseElement* correspondingUseElement() const;
  46
  47         SVGElementInstance* parentNode() const;
  48         PassRefPtr<SVGElementInstanceList> childNodes();
  49
  50         SVGElementInstance* previousSibling() const;
  51         SVGElementInstance* nextSibling() const;
  52
  53         SVGElementInstance* firstChild() const;
  54         SVGElementInstance* lastChild() const;
  55
  56         // Internal usage only!
  57         SVGElement* shadowTreeElement() const;
  58         void setShadowTreeElement(SVGElement*);
  59
  60         // Model the TreeShared concept, integrated within EventTarget inheritance.
  61         virtual void refEventTarget() { ++m_refCount;  }
  62         virtual void derefEventTarget() { if (--m_refCount <= 0 && !m_parent) delete this; }
  63         // khtml compat
  64         virtual void ref() { refEventTarget(); }
  65         virtual void deref() { derefEventTarget(); }
  66
  67         bool hasOneRef() { return m_refCount == 1; }
  68         int refCount() const { return m_refCount; }
  69
  70         void setParent(SVGElementInstance* parent) { m_parent = parent; }
  71         SVGElementInstance* parent() const { return m_parent; }
  72
  73         // SVGElementInstance supports both toSVGElementInstance and toNode since so much mouse handling code depends on toNode returning a valid node.
  74         virtual EventTargetNode* toNode();
  75         virtual SVGElementInstance* toSVGElementInstance();
  76
  77         virtual void addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture);
  78         virtual void removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture);
  79         virtual bool dispatchEvent(PassRefPtr<Event>, ExceptionCode&, bool tempEvent = false);
  80
  81     private:
  82         SVGElementInstance(const SVGElementInstance&);
  83         SVGElementInstance& operator=(const SVGElementInstance&);
  84
  85     private: // Helper methods
  86         friend class SVGUseElement;
  87         void appendChild(PassRefPtr<SVGElementInstance> child);
  88
  89         friend class SVGStyledElement;
  90         void updateInstance(SVGElement*);
  91
  92     private:
  93         int m_refCount;
  94         SVGElementInstance* m_parent;
  95
  96         SVGUseElement* m_useElement;
  97         RefPtr<SVGElement> m_element;
  98         SVGElement* m_shadowTreeElement;
  99
 100         SVGElementInstance* m_previousSibling;
 101         SVGElementInstance* m_nextSibling;
 102
 103         SVGElementInstance* m_firstChild;
 104         SVGElementInstance* m_lastChild;
 105     };
 106
 107 } // namespace WebCore
 108
 109 #endif // ENABLE(SVG)
 110 #endif
 111
 112 // vim:ts=4:noet