ash/session_state_observer.h

   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 ASH_SESSION_STATE_OBSERVER_H_
   6 #define ASH_SESSION_STATE_OBSERVER_H_
   7
   8 #include <string>
   9
  10 #include "ash/ash_export.h"
  11
  12 namespace ash {
  13
  14 class ASH_EXPORT SessionStateObserver {
  15  public:
  16   // Called when active user has changed.
  17   virtual void ActiveUserChanged(const std::string& user_id) {}
  18
  19   // Called when another user gets added to the existing session.
  20   virtual void UserAddedToSession(const std::string& user_id) {}
  21
  22  protected:
  23   virtual ~SessionStateObserver() {}
  24 };
  25
  26 }  // namespace ash
  27
  28 #endif  // ASH_SESSION_STATE_OBSERVER_H_