/*
 * 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 "PlatformString.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, 
                    ConditionEventListenerType };
                    
        virtual ~EventListener() { }
        virtual bool operator==(const EventListener&) = 0;
        virtual void handleEvent(ScriptExecutionContext*, Event*) = 0;
        // Return true to indicate that the error is handled.
        virtual bool reportError(ScriptExecutionContext*, const String& /*message*/, const String& /*url*/, int /*lineNumber*/) { return false; }
        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
