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// Copyright 2016 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 SERVICES_UI_WS_USER_ID_TRACKER_OBSERVER_H_
#define SERVICES_UI_WS_USER_ID_TRACKER_OBSERVER_H_
#include <stdint.h>
#include "services/ui/ws/user_id.h"
namespace ui {
namespace ws {
class UserIdTrackerObserver {
public:
virtual void OnActiveUserIdChanged(const UserId& previously_active_id,
const UserId& active_id) {}
virtual void OnUserIdAdded(const UserId& id) {}
virtual void OnUserIdRemoved(const UserId& id) {}
protected:
virtual ~UserIdTrackerObserver() {}
};
} // namespace ws
} // namespace ui
#endif // SERVICES_UI_WS_USER_ID_TRACKER_OBSERVER_H_