/*

 * Copyright (C) 2006, 2008, 2009 Apple Inc. All rights reserved.

 *

 * 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 EventListener_h

#define EventListener_h

#include <wtf/RefCounted.h>

namespace JSC {

    class JSObject;

    class MarkStack;

}

namespace WebCore {

    class ScriptExecutionContext;

    class Event;

    class EventListener : public RefCounted<EventListener> {

    public:

        enum Type {

            JSEventListenerType, 

            ImageEventListenerType, 

            InspectorDOMAgentType,

            InspectorDOMStorageResourceType,

            ObjCEventListenerType,

            CPPEventListenerType,

            ConditionEventListenerType,

            GObjectEventListenerType

        };

        virtual ~EventListener() { }

        virtual bool operator==(const EventListener&) = 0;

        virtual void handleEvent(ScriptExecutionContext*, Event*) = 0;

        virtual bool wasCreatedFromMarkup() const { return false; }

#if USE(JSC)

        virtual void markJSFunction(JSC::MarkStack&) { }

        virtual void invalidateJSFunction(JSC::JSObject*) { }

#endif

        bool isAttribute() const { return virtualisAttribute(); }

        Type type() const { return m_type; }

    protected:

        EventListener(Type type)

            : m_type(type)

        {

        }

    private:

        virtual bool virtualisAttribute() const { return false; }

        Type m_type;

    };

}

#endif