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// 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 kNotifyIntervalSec;
UserActivityDetector();
virtual ~UserActivityDetector();
void set_now_for_test(base::TimeTicks now) { now_for_test_ = now; }
void AddObserver(UserActivityObserver* observer);
void RemoveObserver(UserActivityObserver* observer);
// aura::EventFilter implementation.
virtual bool PreHandleKeyEvent(
aura::Window* target,
aura::KeyEvent* event) OVERRIDE;
virtual bool PreHandleMouseEvent(
aura::Window* target,
aura::MouseEvent* event) OVERRIDE;
virtual ui::TouchStatus PreHandleTouchEvent(
aura::Window* target,
aura::TouchEvent* event) OVERRIDE;
virtual ui::GestureStatus PreHandleGestureEvent(
aura::Window* target,
aura::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_