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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/events/EventListener.h"
     31 #include "core/events/EventTarget.h"
     32 #include "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 GenericEventQueue;
     40 class HTMLMediaElement;
     41 class TextTrack;
     42 class TextTrackList;
     43 
     44 class TextTrackList : public RefCounted<TextTrackList>, public ScriptWrappable, public EventTargetWithInlineData {
     45     REFCOUNTED_EVENT_TARGET(TextTrackList);
     46 public:
     47     static PassRefPtr<TextTrackList> create(HTMLMediaElement* owner)
     48     {
     49         return adoptRef(new TextTrackList(owner));
     50     }
     51     ~TextTrackList();
     52 
     53     unsigned length() const;
     54     int getTrackIndex(TextTrack*);
     55     int getTrackIndexRelativeToRenderedTracks(TextTrack*);
     56     bool contains(TextTrack*) const;
     57 
     58     TextTrack* item(unsigned index);
     59     TextTrack* getTrackById(const AtomicString& id);
     60     void append(PassRefPtr<TextTrack>);
     61     void remove(TextTrack*);
     62 
     63     // EventTarget
     64     virtual const AtomicString& interfaceName() const OVERRIDE;
     65     virtual ExecutionContext* executionContext() const OVERRIDE;
     66 
     67     DEFINE_ATTRIBUTE_EVENT_LISTENER(addtrack);
     68     DEFINE_ATTRIBUTE_EVENT_LISTENER(change);
     69     DEFINE_ATTRIBUTE_EVENT_LISTENER(removetrack);
     70 
     71     void clearOwner() { m_owner = 0; }
     72     Node* owner() const;
     73 
     74     void scheduleChangeEvent();
     75 
     76 private:
     77     explicit TextTrackList(HTMLMediaElement*);
     78 
     79     void scheduleTrackEvent(const AtomicString& eventName, PassRefPtr<TextTrack>);
     80 
     81     void scheduleAddTrackEvent(PassRefPtr<TextTrack>);
     82     void scheduleRemoveTrackEvent(PassRefPtr<TextTrack>);
     83 
     84     void invalidateTrackIndexesAfterTrack(TextTrack*);
     85 
     86     HTMLMediaElement* m_owner;
     87 
     88     OwnPtr<GenericEventQueue> m_asyncEventQueue;
     89 
     90     Vector<RefPtr<TextTrack> > m_addTrackTracks;
     91     Vector<RefPtr<TextTrack> > m_elementTracks;
     92     Vector<RefPtr<TextTrack> > m_inbandTracks;
     93 };
     94 
     95 } // namespace WebCore
     96 
     97 #endif
     98