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      1 // Copyright (c) 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_CHILD_POWER_MONITOR_BROADCAST_SOURCE_H_
      6 #define CONTENT_CHILD_POWER_MONITOR_BROADCAST_SOURCE_H_
      7 
      8 #include "base/power_monitor/power_monitor_source.h"
      9 #include "content/common/content_export.h"
     10 #include "ipc/ipc_channel.h"
     11 
     12 namespace IPC {
     13 class MessageFilter;
     14 }
     15 
     16 namespace content {
     17 
     18 class PowerMessageFilter;
     19 
     20 // Receives Power Monitor IPC messages sent from the browser process and relays
     21 // them to the PowerMonitor of the current process.
     22 class CONTENT_EXPORT PowerMonitorBroadcastSource :
     23     public base::PowerMonitorSource {
     24  public:
     25   explicit PowerMonitorBroadcastSource();
     26   virtual ~PowerMonitorBroadcastSource();
     27 
     28   IPC::MessageFilter* GetMessageFilter();
     29 
     30  private:
     31   friend class PowerMessageFilter;
     32 
     33   virtual bool IsOnBatteryPowerImpl() OVERRIDE;
     34 
     35   void OnPowerStateChange(bool on_battery_power);
     36   void OnSuspend();
     37   void OnResume();
     38 
     39   bool last_reported_battery_power_state_;
     40   scoped_refptr<PowerMessageFilter> message_filter_;
     41 
     42   DISALLOW_COPY_AND_ASSIGN(PowerMonitorBroadcastSource);
     43 };
     44 
     45 }  // namespace content
     46 
     47 #endif  // CONTENT_CHILD_POWER_MONITOR_MESSAGE_FILTER_H_
     48