remoting/host/resizing_host_observer.h

   1 // Copyright (c) 2012 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 REMOTING_HOST_RESIZING_HOST_OBSERVER_H_
   6 #define REMOTING_HOST_RESIZING_HOST_OBSERVER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "base/time/time.h"
  14 #include "base/timer/timer.h"
  15 #include "remoting/host/screen_controls.h"
  16 #include "remoting/host/screen_resolution.h"
  17
  18 namespace remoting {
  19
  20 class DesktopResizer;
  21
  22 // TODO(alexeypa): Rename this class to reflect that it is not
  23 // HostStatusObserver any more.
  24
  25 // Uses the specified DesktopResizer to match host desktop size to the client
  26 // view size as closely as is possible. When the connection closes, restores
  27 // the original desktop size.
  28 class ResizingHostObserver : public ScreenControls {
  29  public:
  30   explicit ResizingHostObserver(scoped_ptr<DesktopResizer> desktop_resizer);
  31   virtual ~ResizingHostObserver();
  32
  33   // ScreenControls interface.
  34   virtual void SetScreenResolution(const ScreenResolution& resolution) OVERRIDE;
  35
  36   // Provide a replacement for base::Time::Now so that this class can be
  37   // unit-tested in a timely manner. This function will be called exactly
  38   // once for each call to SetScreenResolution.
  39   void SetNowFunctionForTesting(
  40       const base::Callback<base::Time(void)>& now_function);
  41
  42  private:
  43   scoped_ptr<DesktopResizer> desktop_resizer_;
  44   ScreenResolution original_resolution_;
  45
  46   // State to manage rate-limiting of desktop resizes.
  47   base::OneShotTimer<ResizingHostObserver> deferred_resize_timer_;
  48   base::Time previous_resize_time_;
  49   base::Callback<base::Time(void)> now_function_;
  50
  51   base::WeakPtrFactory<ResizingHostObserver> weak_factory_;
  52
  53   DISALLOW_COPY_AND_ASSIGN(ResizingHostObserver);
  54 };
  55
  56 }  // namespace remoting
  57
  58 #endif  // REMOTING_HOST_RESIZING_HOST_OBSERVER_H_