power_event_observer.cc revision 5c02ac1a9c1b504631c0a3d2b6e737b5d738bae1 
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
16namespace ash {
17
18PowerEventObserver::PowerEventObserver()
19    : screen_locked_(false) {
20  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
21      AddObserver(this);
22  chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
23      AddObserver(this);
24}
25
26PowerEventObserver::~PowerEventObserver() {
27  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
28      RemoveObserver(this);
29  chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
30      RemoveObserver(this);
31}
32
33void PowerEventObserver::BrightnessChanged(int level, bool user_initiated) {
34  Shell::GetInstance()->power_button_controller()->OnScreenBrightnessChanged(
35      static_cast<double>(level));
36}
37
38void 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
57void PowerEventObserver::SuspendDone(const base::TimeDelta& sleep_duration) {
58  Shell::GetInstance()->display_configurator()->ResumeDisplays();
59  Shell::GetInstance()->system_tray_notifier()->NotifyRefreshClock();
60}
61
62void 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
78void PowerEventObserver::ScreenIsUnlocked() {
79  screen_locked_ = false;
80}
81
82}  // namespace ash
83