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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/ash_export.h"
      9 #include "ash/wm/session_state_animator.h"
     10 #include "base/basictypes.h"
     11 
     12 #if defined(OS_CHROMEOS)
     13 #include "ui/display/chromeos/display_configurator.h"
     14 #endif
     15 
     16 namespace gfx {
     17 class Rect;
     18 class Size;
     19 }
     20 
     21 namespace ui {
     22 class Layer;
     23 }
     24 
     25 namespace ash {
     26 
     27 namespace test {
     28 class PowerButtonControllerTest;
     29 }
     30 
     31 class LockStateController;
     32 
     33 // Displays onscreen animations and locks or suspends the system in response to
     34 // the power button being pressed or released.
     35 class ASH_EXPORT PowerButtonController
     36 // TODO(derat): Remove these ifdefs after DisplayConfigurator becomes
     37 // cross-platform.
     38 #if defined(OS_CHROMEOS)
     39     : public ui::DisplayConfigurator::Observer
     40 #endif
     41       {
     42  public:
     43   explicit PowerButtonController(LockStateController* controller);
     44   virtual ~PowerButtonController();
     45 
     46   void set_has_legacy_power_button_for_test(bool legacy) {
     47     has_legacy_power_button_ = legacy;
     48   }
     49 
     50   // Called when the current screen brightness changes.
     51   void OnScreenBrightnessChanged(double percent);
     52 
     53   // Called when the power or lock buttons are pressed or released.
     54   void OnPowerButtonEvent(bool down, const base::TimeTicks& timestamp);
     55   void OnLockButtonEvent(bool down, const base::TimeTicks& timestamp);
     56 
     57 #if defined(OS_CHROMEOS)
     58   // Overriden from ui::DisplayConfigurator::Observer:
     59   virtual void OnDisplayModeChanged(
     60       const ui::DisplayConfigurator::DisplayStateList& outputs) OVERRIDE;
     61 #endif
     62 
     63  private:
     64   friend class test::PowerButtonControllerTest;
     65 
     66   // Are the power or lock buttons currently held?
     67   bool power_button_down_;
     68   bool lock_button_down_;
     69 
     70   // Has the screen brightness been reduced to 0%?
     71   bool brightness_is_zero_;
     72 
     73   // True if an internal display is off while an external display is on (e.g.
     74   // for Chrome OS's docked mode, where a Chromebook's lid is closed while an
     75   // external display is connected).
     76   bool internal_display_off_and_external_display_on_;
     77 
     78   // Was a command-line switch set telling us that we're running on hardware
     79   // that misreports power button releases?
     80   bool has_legacy_power_button_;
     81 
     82   LockStateController* controller_; // Not owned.
     83 
     84   DISALLOW_COPY_AND_ASSIGN(PowerButtonController);
     85 };
     86 
     87 }  // namespace ash
     88 
     89 #endif  // ASH_WM_POWER_BUTTON_CONTROLLER_H_
     90