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      1 // Copyright (c) 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 "chrome/browser/chromeos/power/suspend_observer.h"
      6 
      7 #include "ash/shell.h"
      8 #include "ash/wm/user_activity_detector.h"
      9 #include "base/prefs/pref_service.h"
     10 #include "chrome/browser/chromeos/login/user_manager.h"
     11 #include "chrome/browser/extensions/api/system_private/system_private_api.h"
     12 #include "chrome/browser/profiles/profile.h"
     13 #include "chrome/browser/profiles/profile_manager.h"
     14 #include "chrome/common/pref_names.h"
     15 #include "chromeos/dbus/dbus_thread_manager.h"
     16 #include "chromeos/display/output_configurator.h"
     17 
     18 namespace chromeos {
     19 
     20 SuspendObserver::SuspendObserver()
     21     : power_client_(DBusThreadManager::Get()->GetPowerManagerClient()),
     22       session_client_(DBusThreadManager::Get()->GetSessionManagerClient()),
     23       screen_locked_(false) {
     24   power_client_->AddObserver(this);
     25   session_client_->AddObserver(this);
     26 }
     27 
     28 SuspendObserver::~SuspendObserver() {
     29   session_client_->RemoveObserver(this);
     30   session_client_ = NULL;
     31   power_client_->RemoveObserver(this);
     32   power_client_ = NULL;
     33 }
     34 
     35 void SuspendObserver::SuspendImminent() {
     36   // If the lock-before-suspending pref is set, get a callback to block
     37   // suspend and ask the session manager to lock the screen.
     38   Profile* profile = ProfileManager::GetDefaultProfileOrOffTheRecord();
     39   if (profile && profile->GetPrefs()->GetBoolean(prefs::kEnableScreenLock) &&
     40       UserManager::Get()->CanCurrentUserLock() && !screen_locked_) {
     41     screen_lock_callback_ = power_client_->GetSuspendReadinessCallback();
     42     VLOG(1) << "Requesting screen lock from SuspendObserver";
     43     session_client_->RequestLockScreen();
     44   }
     45 
     46   ash::Shell::GetInstance()->user_activity_detector()->OnDisplayPowerChanging();
     47   ash::Shell::GetInstance()->output_configurator()->SuspendDisplays();
     48 }
     49 
     50 void SuspendObserver::ScreenIsLocked() {
     51   screen_locked_ = true;
     52 
     53   // Stop blocking suspend after the screen is locked.
     54   if (!screen_lock_callback_.is_null()) {
     55     VLOG(1) << "Screen locked due to suspend";
     56     // Run the callback asynchronously.  ScreenIsLocked() is currently
     57     // called asynchronously after RequestLockScreen(), but this guards
     58     // against it being made synchronous later.
     59     base::MessageLoop::current()->PostTask(FROM_HERE, screen_lock_callback_);
     60     screen_lock_callback_.Reset();
     61   } else {
     62     VLOG(1) << "Screen locked without suspend";
     63   }
     64 }
     65 
     66 void SuspendObserver::ScreenIsUnlocked() {
     67   screen_locked_ = false;
     68 }
     69 
     70 }  // namespace chromeos
     71