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      1 /*
      2  * Copyright (C) 2011 Google 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 LoadableTextTrack_h
     27 #define LoadableTextTrack_h
     28 
     29 #include "core/html/track/TextTrack.h"
     30 #include "core/loader/TextTrackLoader.h"
     31 #include "wtf/PassRefPtr.h"
     32 
     33 namespace WebCore {
     34 
     35 class HTMLTrackElement;
     36 class LoadableTextTrack;
     37 
     38 class LoadableTextTrackClient : public TextTrackClient {
     39 public:
     40     virtual ~LoadableTextTrackClient() { }
     41 
     42     virtual bool canLoadUrl(LoadableTextTrack*, const KURL&) { return false; }
     43     virtual void loadingCompleted(LoadableTextTrack*, bool /* loadingFailed */) { }
     44 };
     45 
     46 class LoadableTextTrack : public TextTrack, private TextTrackLoaderClient {
     47 public:
     48     static PassRefPtr<LoadableTextTrack> create(HTMLTrackElement* track, const String& kind, const String& label, const String& language)
     49     {
     50         return adoptRef(new LoadableTextTrack(track, kind, label, language));
     51     }
     52     virtual ~LoadableTextTrack();
     53 
     54     void scheduleLoad(const KURL&);
     55 
     56     virtual void clearClient();
     57 
     58     size_t trackElementIndex();
     59     HTMLTrackElement* trackElement() { return m_trackElement; }
     60 
     61     virtual bool isDefault() const OVERRIDE { return m_isDefault; }
     62     virtual void setIsDefault(bool isDefault) OVERRIDE  { m_isDefault = isDefault; }
     63 
     64 private:
     65     // TextTrackLoaderClient
     66     virtual bool shouldLoadCues(TextTrackLoader*) { return true; }
     67     virtual void newCuesAvailable(TextTrackLoader*);
     68     virtual void cueLoadingStarted(TextTrackLoader*);
     69     virtual void cueLoadingCompleted(TextTrackLoader*, bool loadingFailed);
     70 #if ENABLE(WEBVTT_REGIONS)
     71     virtual void newRegionsAvailable(TextTrackLoader*);
     72 #endif
     73 
     74     LoadableTextTrack(HTMLTrackElement*, const String& kind, const String& label, const String& language);
     75 
     76     void loadTimerFired(Timer<LoadableTextTrack>*);
     77 
     78     HTMLTrackElement* m_trackElement;
     79     Timer<LoadableTextTrack> m_loadTimer;
     80     OwnPtr<TextTrackLoader> m_loader;
     81     KURL m_url;
     82     bool m_isDefault;
     83 };
     84 } // namespace WebCore
     85 
     86 #endif
     87