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// 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_STATE_OBSERVER_H_
#define ASH_SESSION_STATE_OBSERVER_H_
#include <string>
#include "ash/ash_export.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) {}
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_STATE_OBSERVER_H_
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