content/browser/renderer_host/renderer_frame_manager.h

   1 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_
   7
   8 #include <list>
   9 #include <set>
  10
  11 #include "base/basictypes.h"
  12 #include "base/memory/singleton.h"
  13 #include "content/common/content_export.h"
  14
  15 namespace content {
  16
  17 class CONTENT_EXPORT RendererFrameManagerClient {
  18  public:
  19   virtual ~RendererFrameManagerClient() {}
  20   virtual void EvictCurrentFrame() = 0;
  21 };
  22
  23 class CONTENT_EXPORT RendererFrameManager {
  24  public:
  25   static RendererFrameManager* GetInstance();
  26
  27   void AddFrame(RendererFrameManagerClient*, bool visible);
  28   void RemoveFrame(RendererFrameManagerClient*);
  29   void SetFrameVisibility(RendererFrameManagerClient*, bool visible);
  30
  31   size_t max_number_of_saved_frames() const {
  32     return max_number_of_saved_frames_;
  33   }
  34
  35  private:
  36   RendererFrameManager();
  37   ~RendererFrameManager();
  38   void CullHiddenFrames();
  39   friend struct DefaultSingletonTraits<RendererFrameManager>;
  40
  41   std::set<RendererFrameManagerClient*> visible_frames_;
  42   std::list<RendererFrameManagerClient*> hidden_frames_;
  43   size_t max_number_of_saved_frames_;
  44
  45   DISALLOW_COPY_AND_ASSIGN(RendererFrameManager);
  46 };
  47
  48 }  // namespace content
  49
  50 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_