ui/base/user_activity/user_activity_observer.h

   1 // Copyright 2014 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 UI_BASE_USER_ACTIVITY_USER_ACTIVITY_OBSERVER_H_
   6 #define UI_BASE_USER_ACTIVITY_USER_ACTIVITY_OBSERVER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "ui/base/ui_base_export.h"
  10
  11 namespace ui {
  12 class Event;
  13 }
  14
  15 namespace ui {
  16
  17 // Interface for classes that want to be notified about user activity.
  18 // Implementations should register themselves with UserActivityDetector.
  19 class UI_BASE_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 ui
  34
  35 #endif  // UI_BASE_USER_ACTIVITY_USER_ACTIVITY_OBSERVER_H_