1 // Copyright (c) 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 CHROMEOS_DBUS_SYSTEM_CLOCK_CLIENT_H_ 6 #define CHROMEOS_DBUS_SYSTEM_CLOCK_CLIENT_H_ 7 8 #include "base/callback.h" 9 #include "chromeos/chromeos_export.h" 10 #include "chromeos/dbus/dbus_client.h" 11 12 namespace chromeos { 13 14 // SystemClockClient is used to communicate with the system clock. 15 class CHROMEOS_EXPORT SystemClockClient : public DBusClient { 16 public: 17 // Interface for observing changes from the system clock. 18 class Observer { 19 public: 20 // Called when the status is updated. 21 virtual void SystemClockUpdated(); 22 23 // Called when the system clock has become settable or unsettable, e.g., 24 // when the clock syncs with or goes out of sync with the network. 25 virtual void SystemClockCanSetTimeChanged(bool can_set_time); 26 27 protected: ~Observer()28 virtual ~Observer() {} 29 }; 30 31 virtual ~SystemClockClient(); 32 33 // Adds the given observer. 34 virtual void AddObserver(Observer* observer) = 0; 35 // Removes the given observer if this object has the observer. 36 virtual void RemoveObserver(Observer* observer) = 0; 37 // Returns true if this object has the given observer. 38 virtual bool HasObserver(Observer* observer) = 0; 39 40 // Sets the system clock. 41 virtual void SetTime(int64 time_in_seconds) = 0; 42 43 // Checks if the system time can be set. 44 virtual bool CanSetTime() = 0; 45 46 // Creates the instance. 47 static SystemClockClient* Create(); 48 49 protected: 50 // Create() should be used instead. 51 SystemClockClient(); 52 53 private: 54 DISALLOW_COPY_AND_ASSIGN(SystemClockClient); 55 }; 56 57 } // namespace chromeos 58 59 #endif // CHROMEOS_DBUS_SYSTEM_CLOCK_CLIENT_H_ 60