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 internal {
  15
  16 namespace tray {
  17 class BrightnessView;
  18 }
  19
  20 class TrayBrightness : public SystemTrayItem,
  21                        public chromeos::PowerManagerClient::Observer {
  22  public:
  23   explicit TrayBrightness(SystemTray* system_tray);
  24   virtual ~TrayBrightness();
  25
  26  private:
  27   // Sends a request to get the current screen brightness so |current_percent_|
  28   // can be initialized.
  29   void GetInitialBrightness();
  30
  31   // Updates |current_percent_| with the initial brightness requested by
  32   // GetInitialBrightness(), if we haven't seen the brightness already in the
  33   // meantime.
  34   void HandleInitialBrightness(double percent);
  35
  36   // Overridden from SystemTrayItem.
  37   virtual views::View* CreateTrayView(user::LoginStatus status) OVERRIDE;
  38   virtual views::View* CreateDefaultView(user::LoginStatus status) OVERRIDE;
  39   virtual views::View* CreateDetailedView(user::LoginStatus status) OVERRIDE;
  40   virtual void DestroyTrayView() OVERRIDE;
  41   virtual void DestroyDefaultView() OVERRIDE;
  42   virtual void DestroyDetailedView() OVERRIDE;
  43   virtual void UpdateAfterLoginStatusChange(user::LoginStatus status) OVERRIDE;
  44   virtual bool ShouldHideArrow() const OVERRIDE;
  45   virtual bool ShouldShowLauncher() const OVERRIDE;
  46
  47   // Overriden from PowerManagerClient::Observer.
  48   virtual void BrightnessChanged(int level, bool user_initiated) OVERRIDE;
  49
  50   void HandleBrightnessChanged(double percent, bool user_initiated);
  51
  52   base::WeakPtrFactory<TrayBrightness> weak_ptr_factory_;
  53
  54   tray::BrightnessView* brightness_view_;
  55
  56   // Was |brightness_view_| created for CreateDefaultView() rather than
  57   // CreateDetailedView()?  Used to avoid resetting |brightness_view_|
  58   // inappropriately in DestroyDefaultView() or DestroyDetailedView().
  59   bool is_default_view_;
  60
  61   // Brightness level in the range [0.0, 100.0] that we've heard about most
  62   // recently.
  63   double current_percent_;
  64
  65   // Has |current_percent_| been initialized?
  66   bool got_current_percent_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(TrayBrightness);
  69 };
  70
  71 }  // namespace internal
  72 }  // namespace ash
  73
  74 #endif  // ASH_SYSTEM_CHROMEOS_BRIGHTNESS_TRAY_BRIGHTNESS_H_