text: /*
   * Copyright (C) 2011 Google 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 THIRD_PARTY_BLINK_RENDERER_CORE_HTML_TRACK_HTML_TRACK_ELEMENT_H_
  #define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_TRACK_HTML_TRACK_ELEMENT_H_
  
  #include "third_party/blink/renderer/core/html/html_element.h"
  #include "third_party/blink/renderer/core/html/track/text_track.h"
  #include "third_party/blink/renderer/core/loader/text_track_loader.h"
  #include "third_party/blink/renderer/platform/heap/handle.h"
  
  namespace blink {
  
  class HTMLMediaElement;
  class LoadableTextTrack;
  
  class HTMLTrackElement final : public HTMLElement,
                                 private TextTrackLoaderClient {
    DEFINE_WRAPPERTYPEINFO();
    USING_GARBAGE_COLLECTED_MIXIN(HTMLTrackElement);
  
   public:
    explicit HTMLTrackElement(Document&);
  
    const AtomicString& kind();
    void setKind(const AtomicString&);
  
    enum ReadyState { kNone = 0, kLoading = 1, kLoaded = 2, kError = 3 };
    ReadyState getReadyState();
    void ScheduleLoad();
  
    TextTrack* track();
  
    void Trace(Visitor*) const override;
  
   private:
    ~HTMLTrackElement() override;
  
    void ParseAttribute(const AttributeModificationParams&) override;
  
    InsertionNotificationRequest InsertedInto(ContainerNode&) override;
  
    void RemovedFrom(ContainerNode&) override;
    bool IsURLAttribute(const Attribute&) const override;
  
    // TextTrackLoaderClient
    void NewCuesAvailable(TextTrackLoader*) override;
    void CueLoadingCompleted(TextTrackLoader*, bool loading_failed) override;
  
    void SetReadyState(ReadyState);
  
    const AtomicString& MediaElementCrossOriginAttribute() const;
    bool CanLoadUrl(const KURL&);
    void LoadTimerFired(TimerBase*);
  
    enum LoadStatus { kFailure, kSuccess };
    void DidCompleteLoad(LoadStatus);
  
    HTMLMediaElement* MediaElement() const;
  
    LoadableTextTrack* EnsureTrack();
  
    Member<LoadableTextTrack> track_;
    Member<TextTrackLoader> loader_;
    TaskRunnerTimer<HTMLTrackElement> load_timer_;
    KURL url_;
  };
  
  }  // namespace blink
  
  #endif  // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_TRACK_HTML_TRACK_ELEMENT_H_
  