blob: b8e02e50ead537dec9187059cf268d00df0121f3 [file] [log] [blame]
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/base_export.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list_threadsafe.h"
#include "base/power_monitor/power_observer.h"
namespace base {
class PowerMonitorSource;
// A class used to monitor the power state change and notify the observers about
// the change event.
class BASE_EXPORT PowerMonitor {
// Takes ownership of |source|.
explicit PowerMonitor(std::unique_ptr<PowerMonitorSource> source);
// Get the process-wide PowerMonitor (if not present, returns NULL).
static PowerMonitor* Get();
// Add and remove an observer.
// Can be called from any thread. |observer| is notified on the sequence
// from which it was registered.
// Must not be called from within a notification callback.
void AddObserver(PowerObserver* observer);
void RemoveObserver(PowerObserver* observer);
// Is the computer currently on battery power.
bool IsOnBatteryPower();
friend class PowerMonitorSource;
PowerMonitorSource* Source();
void NotifyPowerStateChange(bool battery_in_use);
void NotifySuspend();
void NotifyResume();
scoped_refptr<ObserverListThreadSafe<PowerObserver>> observers_;
std::unique_ptr<PowerMonitorSource> source_;
} // namespace base