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      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_WM_LOCK_STATE_OBSERVER_H_
      6 #define ASH_WM_LOCK_STATE_OBSERVER_H_
      7 
      8 #include "ash/ash_export.h"
      9 
     10 namespace ash {
     11 
     12 // Interface for classes that want to be notified by LockStateController when
     13 // session-related events occur.
     14 class ASH_EXPORT LockStateObserver {
     15  public:
     16   enum EventType {
     17     EVENT_PRELOCK_ANIMATION_STARTED,
     18     EVENT_LOCK_ANIMATION_STARTED,
     19     EVENT_LOCK_ANIMATION_FINISHED,
     20   };
     21 
     22   virtual void OnLockStateEvent(EventType event) = 0;
     23   virtual ~LockStateObserver() {}
     24 };
     25 
     26 }  // namespace ash
     27 
     28 #endif  // ASH_WM_LOCK_STATE_OBSERVER_H_
     29