power_button_controller.cc revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
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 "ash/wm/power_button_controller.h"
6
7#include "ash/ash_switches.h"
8#include "ash/shell.h"
9#include "ash/shell_delegate.h"
10#include "ash/shell_window_ids.h"
11#include "ash/wm/session_state_animator.h"
12#include "ash/wm/session_state_controller.h"
13#include "base/command_line.h"
14#include "ui/aura/root_window.h"
15#include "ui/views/corewm/compound_event_filter.h"
16
17namespace ash {
18
19PowerButtonController::PowerButtonController(SessionStateController* controller)
20    : power_button_down_(false),
21      lock_button_down_(false),
22      screen_is_off_(false),
23      has_legacy_power_button_(
24          CommandLine::ForCurrentProcess()->HasSwitch(
25              switches::kAuraLegacyPowerButton)),
26      controller_(controller) {
27}
28
29PowerButtonController::~PowerButtonController() {
30}
31
32void PowerButtonController::OnScreenBrightnessChanged(double percent) {
33  screen_is_off_ = percent <= 0.001;
34}
35
36void PowerButtonController::OnPowerButtonEvent(
37    bool down, const base::TimeTicks& timestamp) {
38  power_button_down_ = down;
39
40  if (controller_->ShutdownRequested())
41    return;
42
43  // Avoid starting the lock/shutdown sequence if the power button is pressed
44  // while the screen is off (http://crbug.com/128451).
45  if (screen_is_off_)
46    return;
47
48  Shell* shell = Shell::GetInstance();
49  if (has_legacy_power_button_) {
50    // If power button releases won't get reported correctly because we're not
51    // running on official hardware, just lock the screen or shut down
52    // immediately.
53    if (down) {
54      if (shell->CanLockScreen() && !shell->IsScreenLocked() &&
55          !controller_->LockRequested()) {
56        controller_->StartLockAnimationAndLockImmediately();
57      } else {
58        controller_->RequestShutdown();
59      }
60    }
61  } else {  // !has_legacy_power_button_
62    if (down) {
63      // If we already have a pending request to lock the screen, wait.
64      if (controller_->LockRequested())
65        return;
66
67      if (shell->CanLockScreen() && !shell->IsScreenLocked())
68        controller_->StartLockAnimation(true);
69      else
70        controller_->StartShutdownAnimation();
71    } else {  // Button is up.
72      if (controller_->CanCancelLockAnimation())
73        controller_->CancelLockAnimation();
74      else if (controller_->CanCancelShutdownAnimation())
75        controller_->CancelShutdownAnimation();
76    }
77  }
78}
79
80void PowerButtonController::OnLockButtonEvent(
81    bool down, const base::TimeTicks& timestamp) {
82  lock_button_down_ = down;
83
84  Shell* shell = Shell::GetInstance();
85  if (!shell->CanLockScreen() || shell->IsScreenLocked() ||
86      controller_->LockRequested() || controller_->ShutdownRequested()) {
87    return;
88  }
89
90  // Give the power button precedence over the lock button (we don't expect both
91  // buttons to be present, so this is just making sure that we don't do
92  // something completely stupid if that assumption changes later).
93  if (power_button_down_)
94    return;
95
96  if (down)
97    controller_->StartLockAnimation(false);
98  else
99    controller_->CancelLockAnimation();
100}
101
102}  // namespace ash
103