/*
    Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.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.
*/

#ifndef SVGElementInstance_h
#define SVGElementInstance_h

#if ENABLE(SVG)
#include "EventTarget.h"
#include "SVGElement.h"
#include "TreeShared.h"

namespace WebCore {

    namespace Private { 
        template<class GenericNode, class GenericNodeContainer>
        void addChildNodesToDeletionQueue(GenericNode*& head, GenericNode*& tail, GenericNodeContainer* container);
    };

    class SVGUseElement;
    class SVGElementInstanceList;

    // SVGElementInstance mimics Node, but without providing all its functionality
    class SVGElementInstance : public TreeShared<SVGElementInstance>,
                               public EventTarget {
    public:
        static PassRefPtr<SVGElementInstance> create(SVGUseElement* useElement, PassRefPtr<SVGElement> originalElement)
        {
            return adoptRef(new SVGElementInstance(useElement, originalElement));
        }

        virtual ~SVGElementInstance();

        bool needsUpdate() const { return m_needsUpdate; }
        void setNeedsUpdate(bool);

        virtual ScriptExecutionContext* scriptExecutionContext() const;

        virtual bool addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture);
        virtual bool removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture);
        virtual void removeAllEventListeners();
        using EventTarget::dispatchEvent;
        virtual bool dispatchEvent(PassRefPtr<Event>);

        SVGElement* correspondingElement() const { return m_element.get(); }
        SVGUseElement* correspondingUseElement() const { return m_useElement; }
        SVGElement* shadowTreeElement() const { return m_shadowTreeElement.get(); }

        SVGElementInstance* parentNode() const { return parent(); }
        PassRefPtr<SVGElementInstanceList> childNodes();

        SVGElementInstance* previousSibling() const { return m_previousSibling; }
        SVGElementInstance* nextSibling() const { return m_nextSibling; }

        SVGElementInstance* firstChild() const { return m_firstChild; }
        SVGElementInstance* lastChild() const { return m_lastChild; }

        Document* ownerDocument() const { return m_element ? m_element->ownerDocument() : 0; }

        static void invalidateAllInstancesOfElement(SVGElement*);

        using TreeShared<SVGElementInstance>::ref;
        using TreeShared<SVGElementInstance>::deref;

        // EventTarget API
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), abort);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), blur);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), change);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), click);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), contextmenu);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), dblclick);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), error);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), focus);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), input);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), keydown);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), keypress);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), keyup);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), load);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), mousedown);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), mousemove);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), mouseout);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), mouseover);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), mouseup);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), mousewheel);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), beforecut);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), cut);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), beforecopy);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), copy);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), beforepaste);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), paste);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), dragenter);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), dragover);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), dragleave);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), drop);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), dragstart);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), drag);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), dragend);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), reset);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), resize);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), scroll);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), search);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), select);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), selectstart);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), submit);
        DEFINE_FORWARDING_ATTRIBUTE_EVENT_LISTENER(correspondingElement(), unload);

    private:
        friend class SVGUseElement;

        SVGElementInstance(SVGUseElement*, PassRefPtr<SVGElement> originalElement);

        virtual Node* toNode() { return shadowTreeElement(); }
        virtual SVGElementInstance* toSVGElementInstance() { return this; }

        void appendChild(PassRefPtr<SVGElementInstance> child);
        void setShadowTreeElement(SVGElement*);
        void forgetWrapper();

        template<class GenericNode, class GenericNodeContainer>
        friend void appendChildToContainer(GenericNode* child, GenericNodeContainer* container);

        template<class GenericNode, class GenericNodeContainer>
        friend void removeAllChildrenInContainer(GenericNodeContainer* container);

        template<class GenericNode, class GenericNodeContainer>
        friend void Private::addChildNodesToDeletionQueue(GenericNode*& head, GenericNode*& tail, GenericNodeContainer* container);

        bool hasChildNodes() const { return m_firstChild; }

        void setFirstChild(SVGElementInstance* child) { m_firstChild = child; }
        void setLastChild(SVGElementInstance* child) { m_lastChild = child; }

        void setNextSibling(SVGElementInstance* sibling) { m_nextSibling = sibling; }
        void setPreviousSibling(SVGElementInstance* sibling) { m_previousSibling = sibling; }    

        virtual void refEventTarget() { ref(); }
        virtual void derefEventTarget() { deref(); }
        virtual EventTargetData* eventTargetData();
        virtual EventTargetData* ensureEventTargetData();

        bool m_needsUpdate : 1;

        SVGUseElement* m_useElement;
        RefPtr<SVGElement> m_element;
        RefPtr<SVGElement> m_shadowTreeElement;

        SVGElementInstance* m_previousSibling;
        SVGElementInstance* m_nextSibling;

        SVGElementInstance* m_firstChild;
        SVGElementInstance* m_lastChild;
    };

} // namespace WebCore

#endif // ENABLE(SVG)
#endif
