src/ash/wm/power_button_controller.cc

   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/session/session_state_delegate.h"
   9 #include "ash/shell.h"
  10 #include "ash/shell_window_ids.h"
  11 #include "ash/wm/lock_state_controller.h"
  12 #include "ash/wm/session_state_animator.h"
  13 #include "base/command_line.h"
  14 #include "ui/aura/window_event_dispatcher.h"
  15 #include "ui/display/types/chromeos/display_snapshot.h"
  16 #include "ui/wm/core/compound_event_filter.h"
  17
  18 namespace ash {
  19
  20 PowerButtonController::PowerButtonController(
  21     LockStateController* controller)
  22     : power_button_down_(false),
  23       lock_button_down_(false),
  24       brightness_is_zero_(false),
  25       internal_display_off_and_external_display_on_(false),
  26       has_legacy_power_button_(
  27           CommandLine::ForCurrentProcess()->HasSwitch(
  28               switches::kAuraLegacyPowerButton)),
  29       controller_(controller) {
  30 #if defined(OS_CHROMEOS)
  31   Shell::GetInstance()->display_configurator()->AddObserver(this);
  32 #endif
  33 }
  34
  35 PowerButtonController::~PowerButtonController() {
  36 #if defined(OS_CHROMEOS)
  37   Shell::GetInstance()->display_configurator()->RemoveObserver(this);
  38 #endif
  39 }
  40
  41 void PowerButtonController::OnScreenBrightnessChanged(double percent) {
  42   brightness_is_zero_ = percent <= 0.001;
  43 }
  44
  45 void PowerButtonController::OnPowerButtonEvent(
  46     bool down, const base::TimeTicks& timestamp) {
  47   power_button_down_ = down;
  48
  49   if (controller_->ShutdownRequested())
  50     return;
  51
  52   // Avoid starting the lock/shutdown sequence if the power button is pressed
  53   // while the screen is off (http://crbug.com/128451), unless an external
  54   // display is still on (http://crosbug.com/p/24912).
  55   if (brightness_is_zero_ && !internal_display_off_and_external_display_on_)
  56     return;
  57
  58   const SessionStateDelegate* session_state_delegate =
  59       Shell::GetInstance()->session_state_delegate();
  60   if (has_legacy_power_button_) {
  61     // If power button releases won't get reported correctly because we're not
  62     // running on official hardware, just lock the screen or shut down
  63     // immediately.
  64     if (down) {
  65       if (session_state_delegate->CanLockScreen() &&
  66           !session_state_delegate->IsScreenLocked() &&
  67           !controller_->LockRequested()) {
  68         controller_->StartLockAnimationAndLockImmediately();
  69       } else {
  70         controller_->RequestShutdown();
  71       }
  72     }
  73   } else {  // !has_legacy_power_button_
  74     if (down) {
  75       // If we already have a pending request to lock the screen, wait.
  76       if (controller_->LockRequested())
  77         return;
  78
  79       if (session_state_delegate->CanLockScreen() &&
  80           !session_state_delegate->IsScreenLocked()) {
  81         controller_->StartLockAnimation(true);
  82       } else {
  83         controller_->StartShutdownAnimation();
  84       }
  85     } else {  // Button is up.
  86       if (controller_->CanCancelLockAnimation())
  87         controller_->CancelLockAnimation();
  88       else if (controller_->CanCancelShutdownAnimation())
  89         controller_->CancelShutdownAnimation();
  90     }
  91   }
  92 }
  93
  94 void PowerButtonController::OnLockButtonEvent(
  95     bool down, const base::TimeTicks& timestamp) {
  96   lock_button_down_ = down;
  97
  98   const SessionStateDelegate* session_state_delegate =
  99       Shell::GetInstance()->session_state_delegate();
 100   if (!session_state_delegate->CanLockScreen() ||
 101       session_state_delegate->IsScreenLocked() ||
 102       controller_->LockRequested() ||
 103       controller_->ShutdownRequested()) {
 104     return;
 105   }
 106
 107   // Give the power button precedence over the lock button (we don't expect both
 108   // buttons to be present, so this is just making sure that we don't do
 109   // something completely stupid if that assumption changes later).
 110   if (power_button_down_)
 111     return;
 112
 113   if (down)
 114     controller_->StartLockAnimation(false);
 115   else
 116     controller_->CancelLockAnimation();
 117 }
 118
 119 #if defined(OS_CHROMEOS)
 120 void PowerButtonController::OnDisplayModeChanged(
 121     const ui::DisplayConfigurator::DisplayStateList& display_states) {
 122   bool internal_display_off = false;
 123   bool external_display_on = false;
 124   for (size_t i = 0; i < display_states.size(); ++i) {
 125     const ui::DisplayConfigurator::DisplayState& state = display_states[i];
 126     if (state.display->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL) {
 127       if (!state.display->current_mode())
 128         internal_display_off = true;
 129     } else if (state.display->current_mode()) {
 130       external_display_on = true;
 131     }
 132   }
 133   internal_display_off_and_external_display_on_ =
 134       internal_display_off && external_display_on;
 135 }
 136 #endif
 137
 138 }  // namespace ash