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