| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef ASH_SESSION_SESSION_STATE_OBSERVER_H_ |
| #define ASH_SESSION_SESSION_STATE_OBSERVER_H_ |
| |
| #include <string> |
| |
| #include "ash/ash_export.h" |
| #include "ash/session/session_state_delegate.h" |
| #include "base/basictypes.h" |
| |
| namespace ash { |
| |
| class ASH_EXPORT SessionStateObserver { |
| public: |
| // Called when active user has changed. |
| virtual void ActiveUserChanged(const std::string& user_id) {} |
| |
| // Called when another user gets added to the existing session. |
| virtual void UserAddedToSession(const std::string& user_id) {} |
| |
| // Called when session state is changed. |
| virtual void SessionStateChanged(SessionStateDelegate::SessionState state) {} |
| |
| protected: |
| virtual ~SessionStateObserver() {} |
| }; |
| |
| // A class to attach / detach an object as a session state observer with a |
| // scoped pointer. |
| class ASH_EXPORT ScopedSessionStateObserver { |
| public: |
| explicit ScopedSessionStateObserver(ash::SessionStateObserver* observer); |
| virtual ~ScopedSessionStateObserver(); |
| |
| private: |
| ash::SessionStateObserver* observer_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedSessionStateObserver); |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_SESSION_SESSION_STATE_OBSERVER_H_ |