// Copyright (c) 2012 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_WM_USER_ACTIVITY_DETECTOR_H_ #define ASH_WM_USER_ACTIVITY_DETECTOR_H_ #include "ash/ash_export.h" #include "base/basictypes.h" #include "base/compiler_specific.h" #include "base/observer_list.h" #include "base/time.h" #include "ui/aura/event_filter.h" namespace ash { class UserActivityObserver; // Watches for input events and notifies observers that the user is active. class ASH_EXPORT UserActivityDetector : public aura::EventFilter { public: // Minimum amount of time between notifications to observers that a video is // playing. static const double kNotifyIntervalMs; UserActivityDetector(); virtual ~UserActivityDetector(); void set_now_for_test(base::TimeTicks now) { now_for_test_ = now; } bool HasObserver(UserActivityObserver* observer) const; void AddObserver(UserActivityObserver* observer); void RemoveObserver(UserActivityObserver* observer); // aura::EventFilter implementation. virtual bool PreHandleKeyEvent( aura::Window* target, ui::KeyEvent* event) OVERRIDE; virtual bool PreHandleMouseEvent( aura::Window* target, ui::MouseEvent* event) OVERRIDE; virtual ui::TouchStatus PreHandleTouchEvent( aura::Window* target, ui::TouchEvent* event) OVERRIDE; virtual ui::GestureStatus PreHandleGestureEvent( aura::Window* target, ui::GestureEvent* event) OVERRIDE; private: // Notifies observers if enough time has passed since the last notification. void MaybeNotify(); ObserverList<UserActivityObserver> observers_; // Last time at which we notified observers that the user was active. base::TimeTicks last_observer_notification_time_; // If set, used when the current time is needed. This can be set by tests to // simulate the passage of time. base::TimeTicks now_for_test_; DISALLOW_COPY_AND_ASSIGN(UserActivityDetector); }; } // namespace ash #endif // ASH_WM_USER_ACTIVITY_DETECTOR_H_