athena/system/power_button_controller.h

   1 // Copyright 2014 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 #ifndef ATHENA_SYSTEM_POWER_BUTTON_CONTROLLER_H_
   6 #define ATHENA_SYSTEM_POWER_BUTTON_CONTROLLER_H_
   7
   8 #include "base/time/time.h"
   9 #include "chromeos/dbus/power_manager_client.h"
  10 #include "ui/compositor/layer_animation_observer.h"
  11 #include "ui/gfx/animation/tween.h"
  12
  13 namespace athena {
  14
  15 // Shuts down in response to the power button being pressed.
  16 class PowerButtonController : public chromeos::PowerManagerClient::Observer,
  17                               public ui::ImplicitAnimationObserver {
  18  public:
  19   PowerButtonController();
  20   virtual ~PowerButtonController();
  21
  22  private:
  23   enum State {
  24     // The screen is animating prior to shutdown. Shutdown can be canceled.
  25     STATE_PRE_SHUTDOWN_ANIMATION,
  26
  27     // A D-Bus shutdown request has been sent. Shutdown cannot be canceled.
  28     STATE_SHUTDOWN_REQUESTED,
  29
  30     STATE_OTHER
  31   };
  32
  33   // Animates the screen's grayscale and brightness to |target|.
  34   void StartGrayscaleAndBrightnessAnimation(float target,
  35                                             int duration_ms,
  36                                             gfx::Tween::Type tween_type);
  37
  38   // chromeos::PowerManagerClient::Observer:
  39   virtual void BrightnessChanged(int level, bool user_initiated) OVERRIDE;
  40   virtual void PowerButtonEventReceived(
  41       bool down,
  42       const base::TimeTicks& timestamp) OVERRIDE;
  43
  44   // ui::ImplicitAnimationObserver:
  45   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
  46
  47   // Whether the screen brightness was reduced to 0%.
  48   bool brightness_is_zero_;
  49
  50   // The last time at which the screen brightness was 0%.
  51   base::TimeTicks zero_brightness_end_time_;
  52
  53   State state_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(PowerButtonController);
  56 };
  57
  58 }  // namespace athena
  59
  60 #endif  // ATHENA_SYSTEM_POWER_BUTTON_CONTROLLER_H_