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56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_POWER_MONITOR_POWER_MONITOR_H_
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#define BASE_POWER_MONITOR_POWER_MONITOR_H_
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#include "base/base_export.h"
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "base/observer_list_threadsafe.h"
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#include "base/power_monitor/power_observer.h"
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namespace base {
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class PowerMonitorSource;
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// A class used to monitor the power state change and notify the observers about
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// the change event.
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class BASE_EXPORT PowerMonitor {
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public:
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// Takes ownership of |source|.
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explicit PowerMonitor(std::unique_ptr<PowerMonitorSource> source);
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~PowerMonitor();
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// Get the process-wide PowerMonitor (if not present, returns NULL).
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static PowerMonitor* Get();
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// Add and remove an observer.
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// Can be called from any thread.
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// Must not be called from within a notification callback.
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void AddObserver(PowerObserver* observer);
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void RemoveObserver(PowerObserver* observer);
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// Is the computer currently on battery power.
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bool IsOnBatteryPower();
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private:
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friend class PowerMonitorSource;
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PowerMonitorSource* Source();
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void NotifyPowerStateChange(bool battery_in_use);
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void NotifySuspend();
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void NotifyResume();
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scoped_refptr<ObserverListThreadSafe<PowerObserver> > observers_;
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std::unique_ptr<PowerMonitorSource> source_;
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DISALLOW_COPY_AND_ASSIGN(PowerMonitor);
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};
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} // namespace base
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#endif // BASE_POWER_MONITOR_POWER_MONITOR_H_
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