base/power_monitor/power_observer.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 BASE_POWER_MONITOR_POWER_OBSERVER_H_
   6 #define BASE_POWER_MONITOR_POWER_OBSERVER_H_
   7
   8 #include "base/base_export.h"
   9 #include "base/compiler_specific.h"
  10
  11 namespace base {
  12
  13 class BASE_EXPORT PowerObserver {
  14  public:
  15   // Notification of a change in power status of the computer, such
  16   // as from switching between battery and A/C power.
  17   virtual void OnPowerStateChange(bool on_battery_power) {};
  18
  19   // Notification that the system is suspending.
  20   virtual void OnSuspend() {}
  21
  22   // Notification that the system is resuming.
  23   virtual void OnResume() {}
  24
  25  protected:
  26   virtual ~PowerObserver() {}
  27 };
  28
  29 }  // namespace base
  30
  31 #endif  // BASE_POWER_MONITOR_POWER_OBSERVER_H_