TrackBase.h   [plain text]

/*
 * Copyright (C) 2011 Apple Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef TrackBase_h
#define TrackBase_h

#if ENABLE(VIDEO_TRACK)

#include "EventTarget.h"
#include <wtf/RefCounted.h>

namespace WebCore {

class ScriptExecutionContext;

class TrackBase : public RefCounted<TrackBase>, public EventTarget {
public:
    virtual ~TrackBase();

    enum Type { BaseTrack, TextTrack, AudioTrack, VideoTrack };
    Type type() const { return m_type; }

    virtual const AtomicString& interfaceName() const;
    virtual ScriptExecutionContext* scriptExecutionContext() const;
    
    using RefCounted<TrackBase>::ref;
    using RefCounted<TrackBase>::deref;

protected:
    TrackBase(ScriptExecutionContext*, Type);
    
    virtual EventTargetData* eventTargetData();
    virtual EventTargetData* ensureEventTargetData();

private:
    Type m_type;
    
    virtual void refEventTarget() { ref(); }
    virtual void derefEventTarget() { deref(); }
    
    ScriptExecutionContext* m_scriptExecutionContext;
    EventTargetData m_eventTargetData;
};

} // namespace WebCore

#endif
#endif // TrackBase_h