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      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/memory/scoped_ptr.h"
      9 #include "base/time/time.h"
     10 #include "base/timer/timer.h"
     11 #include "chromeos/dbus/power_manager_client.h"
     12 
     13 namespace aura {
     14 class Window;
     15 }
     16 
     17 namespace views {
     18 class Widget;
     19 }
     20 
     21 namespace athena {
     22 
     23 // Shuts down in response to the power button being pressed.
     24 class PowerButtonController : public chromeos::PowerManagerClient::Observer {
     25  public:
     26   explicit PowerButtonController(aura::Window* dialog_container);
     27   virtual ~PowerButtonController();
     28 
     29  private:
     30   enum State {
     31     // Releasing the power button sends a suspend request.
     32     STATE_SUSPEND_ON_RELEASE,
     33 
     34     // A warning that the device is about to be shutdown is visible. Releasing
     35     // the power button does not send a suspend or a shutdown request.
     36     STATE_SHUTDOWN_WARNING_VISIBLE,
     37 
     38     // A D-Bus shutdown request has been sent. Shutdown cannot be canceled.
     39     STATE_SHUTDOWN_REQUESTED,
     40 
     41     STATE_OTHER
     42   };
     43 
     44   // Shows the shutdown warning dialog.
     45   void ShowShutdownWarningDialog();
     46 
     47   // Requests shutdown.
     48   void Shutdown();
     49 
     50   // chromeos::PowerManagerClient::Observer:
     51   virtual void BrightnessChanged(int level, bool user_initiated) OVERRIDE;
     52   virtual void PowerButtonEventReceived(
     53       bool down,
     54       const base::TimeTicks& timestamp) OVERRIDE;
     55 
     56   // |shutdown_warning_message_|'s parent container.
     57   aura::Window* warning_message_container_;
     58 
     59   // Shows a warning that the device is about to be shutdown.
     60   scoped_ptr<views::Widget> shutdown_warning_message_;
     61 
     62   // Whether the screen brightness was reduced to 0%.
     63   bool brightness_is_zero_;
     64 
     65   // The last time at which the screen brightness was 0%.
     66   base::TimeTicks zero_brightness_end_time_;
     67 
     68   State state_;
     69 
     70   base::OneShotTimer<PowerButtonController> timer_;
     71 
     72   DISALLOW_COPY_AND_ASSIGN(PowerButtonController);
     73 };
     74 
     75 }  // namespace athena
     76 
     77 #endif  // ATHENA_SYSTEM_POWER_BUTTON_CONTROLLER_H_
     78