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_SYSTEM_DATE_CLOCK_OBSERVER_H_ 6 #define ASH_SYSTEM_DATE_CLOCK_OBSERVER_H_ 7 8 namespace ash { 9 10 class ClockObserver { 11 public: ~ClockObserver()12 virtual ~ClockObserver() {} 13 14 virtual void OnDateFormatChanged() = 0; 15 virtual void OnSystemClockTimeUpdated() = 0; 16 17 // Force a refresh (e.g. after the system is resumed). 18 virtual void Refresh() = 0; 19 }; 20 21 }; 22 23 #endif // ASH_SYSTEM_DATE_CLOCK_OBSERVER_H_ 24