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      1 // Copyright (c) 2012 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 "chrome/browser/chromeos/power/power_button_observer.h"
      6 
      7 #include "ash/shell.h"
      8 #include "ash/system/tray/system_tray_delegate.h"
      9 #include "ash/system/user/login_status.h"
     10 #include "ash/wm/power_button_controller.h"
     11 #include "base/logging.h"
     12 #include "chrome/browser/chrome_notification_types.h"
     13 #include "chrome/browser/chromeos/login/lock/screen_locker.h"
     14 #include "chrome/browser/chromeos/power/session_state_controller_delegate_chromeos.h"
     15 #include "chromeos/dbus/dbus_thread_manager.h"
     16 #include "content/public/browser/notification_service.h"
     17 
     18 namespace chromeos {
     19 
     20 namespace {
     21 
     22 ash::user::LoginStatus GetCurrentLoginStatus() {
     23   if (!ash::Shell::GetInstance()->system_tray_delegate())
     24     return ash::user::LOGGED_IN_NONE;
     25   return ash::Shell::GetInstance()->system_tray_delegate()->
     26       GetUserLoginStatus();
     27 }
     28 
     29 }  // namespace
     30 
     31 PowerButtonObserver::PowerButtonObserver() {
     32   ash::Shell::GetInstance()->lock_state_controller()->
     33       SetDelegate(new SessionStateControllerDelegateChromeos);
     34 
     35   registrar_.Add(
     36       this,
     37       chrome::NOTIFICATION_LOGIN_USER_CHANGED,
     38       content::NotificationService::AllSources());
     39   registrar_.Add(
     40       this,
     41       chrome::NOTIFICATION_APP_TERMINATING,
     42       content::NotificationService::AllSources());
     43   registrar_.Add(
     44       this,
     45       chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED,
     46       content::NotificationService::AllSources());
     47 
     48   DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
     49   DBusThreadManager::Get()->GetSessionManagerClient()->AddObserver(this);
     50 
     51   // Tell the controller about the initial state.
     52   ash::Shell::GetInstance()->OnLoginStateChanged(GetCurrentLoginStatus());
     53 
     54   const ScreenLocker* locker = ScreenLocker::default_screen_locker();
     55   bool locked = locker && locker->locked();
     56   ash::Shell::GetInstance()->OnLockStateChanged(locked);
     57 }
     58 
     59 PowerButtonObserver::~PowerButtonObserver() {
     60   DBusThreadManager::Get()->GetSessionManagerClient()->RemoveObserver(this);
     61   DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
     62 }
     63 
     64 void PowerButtonObserver::Observe(int type,
     65                                   const content::NotificationSource& source,
     66                                   const content::NotificationDetails& details) {
     67   switch (type) {
     68     case chrome::NOTIFICATION_LOGIN_USER_CHANGED: {
     69       ash::Shell::GetInstance()->OnLoginStateChanged(GetCurrentLoginStatus());
     70       break;
     71     }
     72     case chrome::NOTIFICATION_APP_TERMINATING:
     73       ash::Shell::GetInstance()->OnAppTerminating();
     74       break;
     75     case chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED: {
     76       bool locked = *content::Details<bool>(details).ptr();
     77       ash::Shell::GetInstance()->OnLockStateChanged(locked);
     78       break;
     79     }
     80     default:
     81       NOTREACHED() << "Unexpected notification " << type;
     82   }
     83 }
     84 
     85 void PowerButtonObserver::PowerButtonEventReceived(
     86     bool down, const base::TimeTicks& timestamp) {
     87   ash::Shell::GetInstance()->power_button_controller()->
     88       OnPowerButtonEvent(down, timestamp);
     89 }
     90 
     91 }  // namespace chromeos
     92