src/ash/system/chromeos/power/power_event_observer.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 "ash/system/chromeos/power/power_event_observer.h"
   6
   7 #include "ash/session_state_delegate.h"
   8 #include "ash/shell.h"
   9 #include "ash/system/tray/system_tray_notifier.h"
  10 #include "ash/wm/power_button_controller.h"
  11 #include "ash/wm/user_activity_detector.h"
  12 #include "base/prefs/pref_service.h"
  13 #include "chromeos/dbus/dbus_thread_manager.h"
  14 #include "chromeos/display/output_configurator.h"
  15
  16 namespace ash {
  17 namespace internal {
  18
  19 PowerEventObserver::PowerEventObserver()
  20     : screen_locked_(false) {
  21   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
  22       AddObserver(this);
  23   chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
  24       AddObserver(this);
  25 }
  26
  27 PowerEventObserver::~PowerEventObserver() {
  28   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
  29       RemoveObserver(this);
  30   chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
  31       RemoveObserver(this);
  32 }
  33
  34 void PowerEventObserver::BrightnessChanged(int level, bool user_initiated) {
  35   Shell::GetInstance()->power_button_controller()->OnScreenBrightnessChanged(
  36       static_cast<double>(level));
  37 }
  38
  39 void PowerEventObserver::SuspendImminent() {
  40   Shell* shell = Shell::GetInstance();
  41   SessionStateDelegate* delegate = shell->session_state_delegate();
  42
  43   // If the lock-before-suspending pref is set, get a callback to block
  44   // suspend and ask the session manager to lock the screen.
  45   if (!screen_locked_ && delegate->ShouldLockScreenBeforeSuspending() &&
  46       delegate->CanLockScreen()) {
  47     screen_lock_callback_ = chromeos::DBusThreadManager::Get()->
  48         GetPowerManagerClient()->GetSuspendReadinessCallback();
  49     VLOG(1) << "Requesting screen lock from PowerEventObserver";
  50     chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
  51         RequestLockScreen();
  52   }
  53
  54   shell->user_activity_detector()->OnDisplayPowerChanging();
  55   shell->output_configurator()->SuspendDisplays();
  56 }
  57
  58 void PowerEventObserver::SystemResumed(const base::TimeDelta& sleep_duration) {
  59   Shell::GetInstance()->output_configurator()->ResumeDisplays();
  60   Shell::GetInstance()->system_tray_notifier()->NotifyRefreshClock();
  61 }
  62
  63 void PowerEventObserver::ScreenIsLocked() {
  64   screen_locked_ = true;
  65
  66   // Stop blocking suspend after the screen is locked.
  67   if (!screen_lock_callback_.is_null()) {
  68     VLOG(1) << "Screen locked due to suspend";
  69     // Run the callback asynchronously.  ScreenIsLocked() is currently
  70     // called asynchronously after RequestLockScreen(), but this guards
  71     // against it being made synchronous later.
  72     base::MessageLoop::current()->PostTask(FROM_HERE, screen_lock_callback_);
  73     screen_lock_callback_.Reset();
  74   } else {
  75     VLOG(1) << "Screen locked without suspend";
  76   }
  77 }
  78
  79 void PowerEventObserver::ScreenIsUnlocked() {
  80   screen_locked_ = false;
  81 }
  82
  83 }  // namespace internal
  84 }  // namespace ash