src/ash/system/chromeos/brightness/tray_brightness.h

   1 // Copyright 2013 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_SYSTEM_CHROMEOS_BRIGHTNESS_TRAY_BRIGHTNESS_H_
   6 #define ASH_SYSTEM_CHROMEOS_BRIGHTNESS_TRAY_BRIGHTNESS_H_
   7
   8 #include "ash/system/tray/system_tray_item.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "chromeos/dbus/power_manager_client.h"
  12
  13 namespace ash {
  14 namespace tray {
  15 class BrightnessView;
  16 }
  17
  18 class ASH_EXPORT TrayBrightness
  19     : public SystemTrayItem,
  20       public chromeos::PowerManagerClient::Observer {
  21  public:
  22   explicit TrayBrightness(SystemTray* system_tray);
  23   virtual ~TrayBrightness();
  24
  25  private:
  26   friend class TrayBrightnessTest;
  27
  28   // Sends a request to get the current screen brightness so |current_percent_|
  29   // can be initialized.
  30   void GetInitialBrightness();
  31
  32   // Updates |current_percent_| with the initial brightness requested by
  33   // GetInitialBrightness(), if we haven't seen the brightness already in the
  34   // meantime.
  35   void HandleInitialBrightness(double percent);
  36
  37   // Overridden from SystemTrayItem.
  38   virtual views::View* CreateTrayView(user::LoginStatus status) OVERRIDE;
  39   virtual views::View* CreateDefaultView(user::LoginStatus status) OVERRIDE;
  40   virtual views::View* CreateDetailedView(user::LoginStatus status) OVERRIDE;
  41   virtual void DestroyTrayView() OVERRIDE;
  42   virtual void DestroyDefaultView() OVERRIDE;
  43   virtual void DestroyDetailedView() OVERRIDE;
  44   virtual void UpdateAfterLoginStatusChange(user::LoginStatus status) OVERRIDE;
  45   virtual bool ShouldHideArrow() const OVERRIDE;
  46   virtual bool ShouldShowShelf() const OVERRIDE;
  47
  48   // Overriden from PowerManagerClient::Observer.
  49   virtual void BrightnessChanged(int level, bool user_initiated) OVERRIDE;
  50
  51   void HandleBrightnessChanged(double percent, bool user_initiated);
  52
  53   base::WeakPtrFactory<TrayBrightness> weak_ptr_factory_;
  54
  55   tray::BrightnessView* brightness_view_;
  56
  57   // Brightness level in the range [0.0, 100.0] that we've heard about most
  58   // recently.
  59   double current_percent_;
  60
  61   // Has |current_percent_| been initialized?
  62   bool got_current_percent_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(TrayBrightness);
  65 };
  66
  67 }  // namespace ash
  68
  69 #endif  // ASH_SYSTEM_CHROMEOS_BRIGHTNESS_TRAY_BRIGHTNESS_H_