base/power_monitor/power_monitor_source.cc

   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 #include "base/power_monitor/power_monitor_source.h"
   6
   7 #include "base/power_monitor/power_monitor.h"
   8
   9 namespace base {
  10
  11 PowerMonitorSource::PowerMonitorSource()
  12     : on_battery_power_(false),
  13       suspended_(false) {
  14 }
  15
  16 PowerMonitorSource::~PowerMonitorSource() {
  17 }
  18
  19 bool PowerMonitorSource::IsOnBatteryPower() {
  20   AutoLock auto_lock(battery_lock_);
  21   return on_battery_power_;
  22 }
  23
  24 void PowerMonitorSource::ProcessPowerEvent(PowerEvent event_id) {
  25   PowerMonitor* monitor = PowerMonitor::Get();
  26   if (!monitor)
  27     return;
  28
  29   PowerMonitorSource* source = monitor->Source();
  30
  31   // Suppress duplicate notifications.  Some platforms may
  32   // send multiple notifications of the same event.
  33   switch (event_id) {
  34     case POWER_STATE_EVENT:
  35       {
  36         bool new_on_battery_power = source->IsOnBatteryPowerImpl();
  37         bool changed = false;
  38
  39         {
  40           AutoLock auto_lock(source->battery_lock_);
  41           if (source->on_battery_power_ != new_on_battery_power) {
  42               changed = true;
  43               source->on_battery_power_ = new_on_battery_power;
  44           }
  45         }
  46
  47         if (changed)
  48           monitor->NotifyPowerStateChange(new_on_battery_power);
  49       }
  50       break;
  51     case RESUME_EVENT:
  52       if (source->suspended_) {
  53         source->suspended_ = false;
  54         monitor->NotifyResume();
  55       }
  56       break;
  57     case SUSPEND_EVENT:
  58       if (!source->suspended_) {
  59         source->suspended_ = true;
  60         monitor->NotifySuspend();
  61       }
  62       break;
  63   }
  64 }
  65
  66 }  // namespace base