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.
5 #ifndef BASE_POWER_MONITOR_POWER_MONITOR_H_
6 #define BASE_POWER_MONITOR_POWER_MONITOR_H_
8 #include "base/base_export.h"
9 #include "base/basictypes.h"
10 #include "base/memory/ref_counted.h"
11 #include "base/observer_list_threadsafe.h"
12 #include "base/power_monitor/power_observer.h"
16 class PowerMonitorSource;
18 // A class used to monitor the power state change and notify the observers about
20 class BASE_EXPORT PowerMonitor {
22 // Takes ownership of |source|.
23 explicit PowerMonitor(scoped_ptr<PowerMonitorSource> source);
26 // Get the process-wide PowerMonitor (if not present, returns NULL).
27 static PowerMonitor* Get();
29 // Add and remove an observer.
30 // Can be called from any thread.
31 // Must not be called from within a notification callback.
32 void AddObserver(PowerObserver* observer);
33 void RemoveObserver(PowerObserver* observer);
35 // Is the computer currently on battery power.
36 bool IsOnBatteryPower();
39 friend class PowerMonitorSource;
41 PowerMonitorSource* Source();
43 void NotifyPowerStateChange(bool battery_in_use);
47 scoped_refptr<ObserverListThreadSafe<PowerObserver> > observers_;
48 scoped_ptr<PowerMonitorSource> source_;
50 DISALLOW_COPY_AND_ASSIGN(PowerMonitor);
55 #endif // BASE_POWER_MONITOR_POWER_MONITOR_H_