chromeos: Ignore power button presses when screen is off.

ash/wm/power_button_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/power_button_controller.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "base/command_line.h"
@@ skipping 267 matching lines @@
 gfx::Rect PowerButtonController::TestApi::GetBackgroundLayerBounds() const {
   ui::Layer* layer = controller_->background_layer_.get();
   return layer ? layer->bounds() : gfx::Rect();
 }
 
 PowerButtonController::PowerButtonController()
     : login_status_(user::LOGGED_IN_NONE),
       unlocked_login_status_(user::LOGGED_IN_NONE),
       power_button_down_(false),
       lock_button_down_(false),
+      screen_is_off_(false),
       shutting_down_(false),
       has_legacy_power_button_(
           CommandLine::ForCurrentProcess()->HasSwitch(
               switches::kAuraLegacyPowerButton)) {
   Shell::GetInstance()->GetRootWindow()->AddRootWindowObserver(this);
 }
 
 PowerButtonController::~PowerButtonController() {
   Shell::GetInstance()->GetRootWindow()->RemoveRootWindowObserver(this);
 }
@@ skipping 40 matching lines @@
           base::TimeDelta::FromMilliseconds(kLockToShutdownTimeoutMs),
           this, &PowerButtonController::OnLockToShutdownTimeout);
     }
   } else {
     StartAnimation(ALL_BUT_SCREEN_LOCKER_AND_RELATED_CONTAINERS,
                    ANIMATION_RESTORE);
     HideBackgroundLayer();
   }
 }
 
+void PowerButtonController::OnScreenBrightnessChanged(double percent) {
+  screen_is_off_ = percent <= 0.001;
+}
+
 void PowerButtonController::OnStartingLock() {
   if (shutting_down_ || login_status_ == user::LOGGED_IN_LOCKED)
     return;
 
   // Ensure that the background layer is visible -- if the screen was locked via
   // the wrench menu, we won't have already shown the background as part of the
   // slow-close animation.
   ShowBackgroundLayer();
 
   StartAnimation(ALL_BUT_SCREEN_LOCKER_AND_RELATED_CONTAINERS,
                  ANIMATION_FAST_CLOSE);
 
   // Hide the screen locker containers so we can make them fade in later.
   StartAnimation(SCREEN_LOCKER_CONTAINERS, ANIMATION_HIDE);
 }
 
 void PowerButtonController::OnPowerButtonEvent(
     bool down, const base::TimeTicks& timestamp) {
   power_button_down_ = down;
 
   if (shutting_down_)
     return;
 
+  // Avoid starting the lock/shutdown sequence if the power button is pressed
+  // while the screen is off (http://crbug.com/128451).
+  if (screen_is_off_)
+    return;
+
   if (has_legacy_power_button_) {
     // If power button releases won't get reported correctly because we're not
     // running on official hardware, just lock the screen or shut down
     // immediately.
     if (down) {
       ShowBackgroundLayer();
       if (LoggedInAsNonGuest() && login_status_ != user::LOGGED_IN_LOCKED) {
         StartAnimation(ALL_BUT_SCREEN_LOCKER_AND_RELATED_CONTAINERS,
                        ANIMATION_SLOW_CLOSE);
         OnLockTimeout();
@@ skipping 177 matching lines @@
     root_layer->StackAtBottom(background_layer_.get());
   }
   background_layer_->SetVisible(true);
 }
 
 void PowerButtonController::HideBackgroundLayer() {
   background_layer_.reset();
 }
 
 }  // namespace ash