chrome/browser/chromeos/system/system_clock.h

   1 // Copyright 2015 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 CHROME_BROWSER_CHROMEOS_SYSTEM_SYSTEM_CLOCK_H_
   6 #define CHROME_BROWSER_CHROMEOS_SYSTEM_SYSTEM_CLOCK_H_
   7
   8 #include "base/callback_list.h"
   9 #include "base/i18n/time_formatting.h"
  10 #include "base/macros.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "chromeos/login/login_state.h"
  13 #include "components/user_manager/user_manager.h"
  14 #include "content/public/browser/notification_observer.h"
  15 #include "content/public/browser/notification_registrar.h"
  16
  17 class Profile;
  18 class PrefChangeRegistrar;
  19
  20 namespace user_manager {
  21 class User;
  22 }
  23
  24 namespace chromeos {
  25 namespace system {
  26
  27 class SystemClockObserver;
  28
  29 // This is a global singleton (actually a member of BrowserProcessPlatformPart)
  30 // that is responsible for correct time formatting. It listens to events that
  31 // modify on-screen time representation (like ActiveUserChanged) and notifies
  32 // observers.
  33 //
  34 // (Most of) this code used to be a part of ash::SystemTrayDelegate.
  35 class SystemClock : public chromeos::LoginState::Observer,
  36                     public content::NotificationObserver,
  37                     public user_manager::UserManager::UserSessionStateObserver {
  38  public:
  39   SystemClock();
  40   ~SystemClock() override;
  41
  42   void SetLastFocusedPodHourClockType(base::HourClockType hour_clock_type);
  43
  44   void AddObserver(SystemClockObserver* observer);
  45   void RemoveObserver(SystemClockObserver* observer);
  46
  47   bool ShouldUse24HourClock() const;
  48
  49   // content::NotificationObserver implementation.
  50   void Observe(int type,
  51                const content::NotificationSource& source,
  52                const content::NotificationDetails& details) override;
  53
  54   // user_manager::UserManager::UserSessionStateObserver overrides
  55   void ActiveUserChanged(const user_manager::User* user) override;
  56
  57  private:
  58   // Should be the same as CrosSettings::ObserverSubscription.
  59   typedef base::CallbackList<void(void)>::Subscription
  60       CrosSettingsObserverSubscription;
  61
  62   void OnActiveProfileChanged(Profile* profile);
  63   bool OnProfileDestroyed(Profile* profile);
  64
  65   // LoginState::Observer overrides.
  66   void LoggedInStateChanged() override;
  67
  68   void OnSystemPrefChanged();
  69
  70   void UpdateClockType();
  71
  72   bool user_pod_was_focused_;
  73   base::HourClockType last_focused_pod_hour_clock_type_;
  74
  75   Profile* user_profile_;
  76   scoped_ptr<content::NotificationRegistrar> registrar_;
  77   scoped_ptr<PrefChangeRegistrar> user_pref_registrar_;
  78
  79   base::ObserverList<SystemClockObserver> observer_list_;
  80
  81   scoped_ptr<CrosSettingsObserverSubscription> device_settings_observer_;
  82
  83   DISALLOW_COPY_AND_ASSIGN(SystemClock);
  84 };
  85
  86 }  // namespace system
  87 }  // namespace chromeos
  88
  89 #endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_SYSTEM_CLOCK_H_