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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/time.h"
#include "ui/events/event_handler.h"
namespace ash {
class UserActivityObserver;
// Watches for input events and notifies observers that the user is active.
class ASH_EXPORT UserActivityDetector : public ui::EventHandler {
public:
// Minimum amount of time between notifications to observers.
static const int kNotifyIntervalMs;
// Amount of time that mouse events should be ignored after notification
// is received that displays' power states are being changed.
static const int kDisplayPowerChangeIgnoreMouseMs;
UserActivityDetector();
virtual ~UserActivityDetector();
base::TimeTicks last_activity_time() const { return last_activity_time_; }
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);
// Called when displays are about to be turned on or off.
void OnDisplayPowerChanging();
// ui::EventHandler implementation.
virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
private:
// Returns |now_for_test_| if set or base::TimeTicks::Now() otherwise.
base::TimeTicks GetCurrentTime() const;
// Updates |last_activity_time_|. Additionally notifies observers and
// updates |last_observer_notification_time_| if enough time has passed
// since the last notification.
void HandleActivity(const ui::Event* event);
ObserverList<UserActivityObserver> observers_;
// Last time at which user activity was observed.
base::TimeTicks last_activity_time_;
// 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_;
// If set, mouse events will be ignored until this time is reached. This
// is to avoid reporting mouse events that occur when displays are turned
// on or off as user activity.
base::TimeTicks honor_mouse_events_time_;
DISALLOW_COPY_AND_ASSIGN(UserActivityDetector);
};
} // namespace ash
#endif // ASH_WM_USER_ACTIVITY_DETECTOR_H_
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