| // Copyright 2014 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 UI_BASE_USER_ACTIVITY_USER_ACTIVITY_OBSERVER_H_ |
| #define UI_BASE_USER_ACTIVITY_USER_ACTIVITY_OBSERVER_H_ |
| |
| #include "base/macros.h" |
| #include "ui/base/ui_base_export.h" |
| |
| namespace ui { |
| class Event; |
| } |
| |
| namespace ui { |
| |
| // Interface for classes that want to be notified about user activity. |
| // Implementations should register themselves with UserActivityDetector. |
| class UI_BASE_EXPORT UserActivityObserver { |
| public: |
| // Invoked periodically while the user is active (i.e. generating input |
| // events). |event| is the event that triggered the notification; it may |
| // be NULL in some cases (e.g. testing or synthetic invocations). |
| virtual void OnUserActivity(const ui::Event* event) = 0; |
| |
| protected: |
| UserActivityObserver() {} |
| virtual ~UserActivityObserver() {} |
| |
| DISALLOW_COPY_AND_ASSIGN(UserActivityObserver); |
| }; |
| |
| } // namespace ui |
| |
| #endif // UI_BASE_USER_ACTIVITY_USER_ACTIVITY_OBSERVER_H_ |