1// Copyright (c) 2012 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_WM_USER_ACTIVITY_OBSERVER_H_
6#define ASH_WM_USER_ACTIVITY_OBSERVER_H_
7
8#include "ash/ash_export.h"
9#include "base/basictypes.h"
10
11namespace ui {
12class Event;
13}
14
15namespace ash {
16
17// Interface for classes that want to be notified about user activity.
18// Implementations should register themselves with UserActivityDetector.
19class ASH_EXPORT UserActivityObserver {
20 public:
21  // Invoked periodically while the user is active (i.e. generating input
22  // events). |event| is the event that triggered the notification; it may
23  // be NULL in some cases (e.g. testing or synthetic invocations).
24  virtual void OnUserActivity(const ui::Event* event) = 0;
25
26 protected:
27  UserActivityObserver() {}
28  virtual ~UserActivityObserver() {}
29
30  DISALLOW_COPY_AND_ASSIGN(UserActivityObserver);
31};
32
33}  // namespace ash
34
35#endif  // ASH_WM_USER_ACTIVITY_OBSERVER_H_
36