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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_COMMON_SESSION_SESSION_STATE_OBSERVER_H_ | |
6 #define ASH_COMMON_SESSION_SESSION_STATE_OBSERVER_H_ | |
7 | |
8 #include "ash/ash_export.h" | |
9 #include "base/macros.h" | |
10 #include "components/session_manager/session_manager_types.h" | |
11 | |
12 class AccountId; | |
13 | |
14 namespace ash { | |
15 | |
16 class ASH_EXPORT SessionStateObserver { | |
17 public: | |
18 // Called when active user has changed. | |
19 virtual void ActiveUserChanged(const AccountId& account_id) {} | |
20 | |
21 // Called when another user gets added to the existing session. | |
22 virtual void UserAddedToSession(const AccountId& account_id) {} | |
23 | |
24 // Called when session state is changed. | |
25 virtual void SessionStateChanged(session_manager::SessionState state) {} | |
26 | |
27 protected: | |
28 virtual ~SessionStateObserver() {} | |
29 }; | |
30 | |
31 // A class to attach / detach an object as a session state observer. | |
32 class ASH_EXPORT ScopedSessionStateObserver { | |
33 public: | |
34 explicit ScopedSessionStateObserver(SessionStateObserver* observer); | |
35 virtual ~ScopedSessionStateObserver(); | |
36 | |
37 private: | |
38 ash::SessionStateObserver* observer_; | |
39 | |
40 DISALLOW_COPY_AND_ASSIGN(ScopedSessionStateObserver); | |
41 }; | |
42 | |
43 } // namespace ash | |
44 | |
45 #endif // ASH_COMMON_SESSION_SESSION_STATE_OBSERVER_H_ | |
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