text: /*
   * Copyright (C) 2011, 2012 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 TextTrackList_h
  #define TextTrackList_h
  
  #include "core/events/EventListener.h"
  #include "core/events/EventTarget.h"
  #include "core/html/HTMLMediaElement.h"
  #include "platform/Timer.h"
  #include "platform/heap/Handle.h"
  #include "platform/wtf/PassRefPtr.h"
  #include "platform/wtf/Vector.h"
  
  namespace blink {
  
  class GenericEventQueue;
  class TextTrack;
  
  class CORE_EXPORT TextTrackList final : public EventTargetWithInlineData {
    DEFINE_WRAPPERTYPEINFO();
  
   public:
    static TextTrackList* Create(HTMLMediaElement* owner) {
      return new TextTrackList(owner);
    }
    ~TextTrackList() override;
  
    unsigned length() const;
    int GetTrackIndex(TextTrack*);
    int GetTrackIndexRelativeToRenderedTracks(TextTrack*);
    bool Contains(TextTrack*) const;
  
    TextTrack* AnonymousIndexedGetter(unsigned index);
    TextTrack* getTrackById(const AtomicString& id);
    void Append(TextTrack*);
    void Remove(TextTrack*);
  
    // EventTarget
    const AtomicString& InterfaceName() const override;
    ExecutionContext* GetExecutionContext() const override;
  
    DEFINE_ATTRIBUTE_EVENT_LISTENER(addtrack);
    DEFINE_ATTRIBUTE_EVENT_LISTENER(change);
    DEFINE_ATTRIBUTE_EVENT_LISTENER(removetrack);
  
    HTMLMediaElement* Owner() const;
  
    void ScheduleChangeEvent();
    void RemoveAllInbandTracks();
  
    bool HasShowingTracks();
  
    DECLARE_VIRTUAL_TRACE();
  
    DECLARE_VIRTUAL_TRACE_WRAPPERS();
  
   private:
    explicit TextTrackList(HTMLMediaElement*);
  
    void ScheduleTrackEvent(const AtomicString& event_name, TextTrack*);
  
    void ScheduleAddTrackEvent(TextTrack*);
    void ScheduleRemoveTrackEvent(TextTrack*);
  
    void InvalidateTrackIndexesAfterTrack(TextTrack*);
  
    Member<HTMLMediaElement> owner_;
  
    Member<GenericEventQueue> async_event_queue_;
  
    HeapVector<TraceWrapperMember<TextTrack>> add_track_tracks_;
    HeapVector<TraceWrapperMember<TextTrack>> element_tracks_;
    HeapVector<TraceWrapperMember<TextTrack>> inband_tracks_;
  };
  
  }  // namespace blink
  
  #endif  // TextTrackList_h
  