chromecast/renderer/cast_media_load_deferrer.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROMECAST_RENDERER_CAST_MEDIA_LOAD_DEFERRER_H_
   6 #define CHROMECAST_RENDERER_CAST_MEDIA_LOAD_DEFERRER_H_
   7
   8 #include "base/callback.h"
   9 #include "base/macros.h"
  10 #include "content/public/renderer/render_frame_observer.h"
  11
  12 namespace chromecast {
  13
  14 // Defers media player loading in background web apps until brought into
  15 // foreground.
  16 class CastMediaLoadDeferrer : public content::RenderFrameObserver {
  17  public:
  18   // Will run |closure| to continue loading the media resource once the page is
  19   // swapped in.
  20   CastMediaLoadDeferrer(content::RenderFrame* render_frame,
  21                         const base::Closure& continue_loading_cb);
  22   ~CastMediaLoadDeferrer() override;
  23
  24  private:
  25   // content::RenderFrameObserver implementation:
  26   void WasShown() override;
  27
  28   base::Closure continue_loading_cb_;
  29
  30   DISALLOW_COPY_AND_ASSIGN(CastMediaLoadDeferrer);
  31 };
  32
  33 }  // namespace chromecast
  34
  35 #endif  // CHROMECAST_RENDERER_CAST_MEDIA_LOAD_DEFERRER_H_