content/browser/renderer_host/delegated_frame_evictor.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_DELEGATED_FRAME_EVICTOR_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_EVICTOR_H_
   7
   8 #include "content/browser/renderer_host/renderer_frame_manager.h"
   9 #include "content/common/content_export.h"
  10
  11 namespace content {
  12
  13 class CONTENT_EXPORT DelegatedFrameEvictorClient {
  14  public:
  15   virtual ~DelegatedFrameEvictorClient() {}
  16   virtual void EvictDelegatedFrame() = 0;
  17 };
  18
  19 class CONTENT_EXPORT DelegatedFrameEvictor : public RendererFrameManagerClient {
  20  public:
  21   // |client| must outlive |this|.
  22   explicit DelegatedFrameEvictor(DelegatedFrameEvictorClient* client);
  23   virtual ~DelegatedFrameEvictor();
  24
  25   void SwappedFrame(bool visible);
  26   void DiscardedFrame();
  27   void SetVisible(bool visible);
  28   void LockFrame();
  29   void UnlockFrame();
  30   bool HasFrame() { return has_frame_; }
  31
  32  private:
  33   // RendererFrameManagerClient implementation.
  34   virtual void EvictCurrentFrame() OVERRIDE;
  35
  36   DelegatedFrameEvictorClient* client_;
  37   bool has_frame_;
  38
  39   DISALLOW_COPY_AND_ASSIGN(DelegatedFrameEvictor);
  40 };
  41
  42 }  // namespace content
  43
  44 #endif  // CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_EVICTOR_H_