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      1 /*
      2  * Copyright (C) 2011, 2012 Apple Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef TextTrackList_h
     27 #define TextTrackList_h
     28 
     29 #include "bindings/v8/ScriptWrappable.h"
     30 #include "core/dom/EventListener.h"
     31 #include "core/dom/EventTarget.h"
     32 #include "core/platform/Timer.h"
     33 #include "wtf/PassRefPtr.h"
     34 #include "wtf/RefCounted.h"
     35 #include "wtf/Vector.h"
     36 
     37 namespace WebCore {
     38 
     39 class HTMLMediaElement;
     40 class TextTrack;
     41 class TextTrackList;
     42 
     43 class TextTrackList : public RefCounted<TextTrackList>, public ScriptWrappable, public EventTarget {
     44 public:
     45     static PassRefPtr<TextTrackList> create(HTMLMediaElement* owner, ScriptExecutionContext* context)
     46     {
     47         return adoptRef(new TextTrackList(owner, context));
     48     }
     49     ~TextTrackList();
     50 
     51     unsigned length() const;
     52     int getTrackIndex(TextTrack*);
     53     int getTrackIndexRelativeToRenderedTracks(TextTrack*);
     54     bool contains(TextTrack*) const;
     55 
     56     TextTrack* item(unsigned index);
     57     void append(PassRefPtr<TextTrack>);
     58     void remove(TextTrack*);
     59 
     60     // EventTarget
     61     virtual const AtomicString& interfaceName() const;
     62     using RefCounted<TextTrackList>::ref;
     63     using RefCounted<TextTrackList>::deref;
     64     virtual ScriptExecutionContext* scriptExecutionContext() const { return m_context; }
     65 
     66     DEFINE_ATTRIBUTE_EVENT_LISTENER(addtrack);
     67 
     68     void clearOwner() { m_owner = 0; }
     69     Node* owner() const;
     70 
     71     bool isFiringEventListeners() { return m_dispatchingEvents; }
     72 
     73 private:
     74     TextTrackList(HTMLMediaElement*, ScriptExecutionContext*);
     75 
     76     // EventTarget
     77     virtual void refEventTarget() { ref(); }
     78     virtual void derefEventTarget() { deref(); }
     79     virtual EventTargetData* eventTargetData() { return &m_eventTargetData; }
     80     virtual EventTargetData* ensureEventTargetData() { return &m_eventTargetData; }
     81 
     82     void scheduleAddTrackEvent(PassRefPtr<TextTrack>);
     83     void asyncEventTimerFired(Timer<TextTrackList>*);
     84 
     85     void invalidateTrackIndexesAfterTrack(TextTrack*);
     86 
     87     ScriptExecutionContext* m_context;
     88     HTMLMediaElement* m_owner;
     89 
     90     Vector<RefPtr<Event> > m_pendingEvents;
     91     Timer<TextTrackList> m_pendingEventTimer;
     92 
     93     EventTargetData m_eventTargetData;
     94     Vector<RefPtr<TextTrack> > m_addTrackTracks;
     95     Vector<RefPtr<TextTrack> > m_elementTracks;
     96     Vector<RefPtr<TextTrack> > m_inbandTracks;
     97 
     98     int m_dispatchingEvents;
     99 };
    100 
    101 } // namespace WebCore
    102 
    103 #endif
    104