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      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 #ifndef ASH_WM_POWER_BUTTON_CONTROLLER_H_
      6 #define ASH_WM_POWER_BUTTON_CONTROLLER_H_
      7 
      8 #include "ash/accelerators/accelerator_controller.h"
      9 #include "ash/accelerators/accelerator_table.h"
     10 #include "ash/ash_export.h"
     11 #include "ash/wm/session_state_animator.h"
     12 #include "base/basictypes.h"
     13 #include "ui/base/accelerators/accelerator.h"
     14 #include "ui/events/event_handler.h"
     15 
     16 #if defined(OS_CHROMEOS)
     17 #include "ui/display/chromeos/display_configurator.h"
     18 #endif
     19 
     20 namespace gfx {
     21 class Rect;
     22 class Size;
     23 }
     24 
     25 namespace ui {
     26 class Layer;
     27 }
     28 
     29 namespace ash {
     30 
     31 namespace test {
     32 class PowerButtonControllerTest;
     33 }
     34 
     35 class LockStateController;
     36 
     37 // Handles power & lock button events which may result in the locking or
     38 // shutting down of the system as well as taking screen shots while in maximize
     39 // mode.
     40 class ASH_EXPORT PowerButtonController : ui::EventHandler
     41 // TODO(derat): Remove these ifdefs after DisplayConfigurator becomes
     42 // cross-platform.
     43 #if defined(OS_CHROMEOS)
     44       , public ui::DisplayConfigurator::Observer
     45 #endif
     46       {
     47  public:
     48   explicit PowerButtonController(LockStateController* controller);
     49   virtual ~PowerButtonController();
     50 
     51   void set_has_legacy_power_button_for_test(bool legacy) {
     52     has_legacy_power_button_ = legacy;
     53   }
     54 
     55   void set_enable_quick_lock_for_test(bool enable_quick_lock) {
     56     enable_quick_lock_ = enable_quick_lock;
     57   }
     58 
     59   // Called when the current screen brightness changes.
     60   void OnScreenBrightnessChanged(double percent);
     61 
     62   // Called when the power or lock buttons are pressed or released.
     63   void OnPowerButtonEvent(bool down, const base::TimeTicks& timestamp);
     64   void OnLockButtonEvent(bool down, const base::TimeTicks& timestamp);
     65 
     66   // ui::EventHandler:
     67   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
     68 
     69 #if defined(OS_CHROMEOS)
     70   // Overriden from ui::DisplayConfigurator::Observer:
     71   virtual void OnDisplayModeChanged(
     72       const ui::DisplayConfigurator::DisplayStateList& outputs) OVERRIDE;
     73 #endif
     74 
     75  private:
     76   friend class test::PowerButtonControllerTest;
     77 
     78   // Are the power or lock buttons currently held?
     79   bool power_button_down_;
     80   bool lock_button_down_;
     81 
     82   // True when the volume down button is being held down.
     83   bool volume_down_pressed_;
     84 
     85   // Has the screen brightness been reduced to 0%?
     86   bool brightness_is_zero_;
     87 
     88   // True if an internal display is off while an external display is on (e.g.
     89   // for Chrome OS's docked mode, where a Chromebook's lid is closed while an
     90   // external display is connected).
     91   bool internal_display_off_and_external_display_on_;
     92 
     93   // Was a command-line switch set telling us that we're running on hardware
     94   // that misreports power button releases?
     95   bool has_legacy_power_button_;
     96 
     97   // Enables quick, non-cancellable locking of the screen when in maximize mode.
     98   bool enable_quick_lock_;
     99 
    100   LockStateController* controller_;  // Not owned.
    101 
    102   DISALLOW_COPY_AND_ASSIGN(PowerButtonController);
    103 };
    104 
    105 }  // namespace ash
    106 
    107 #endif  // ASH_WM_POWER_BUTTON_CONTROLLER_H_
    108