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// 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_DETECTOR_H_
#define UI_BASE_USER_ACTIVITY_USER_ACTIVITY_DETECTOR_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/observer_list.h"
#include "base/time/time.h"
#include "ui/base/ui_base_export.h"
#include "ui/events/event.h"
#include "ui/events/platform/platform_event_observer.h"
namespace ui {
class UserActivityObserver;
// Watches for input events and notifies observers that the user is active.
class UI_BASE_EXPORT UserActivityDetector : public ui::PlatformEventObserver {
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();
~UserActivityDetector() override;
// Returns the UserActivityDetector instance if one was created.
static UserActivityDetector* Get();
base::TimeTicks last_activity_time() const { return last_activity_time_; }
void set_now_for_test(base::TimeTicks now) { now_for_test_ = now; }
bool HasObserver(const 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::PlatformEventObserver:
void WillProcessEvent(const PlatformEvent& platform_event) override {}
void DidProcessEvent(const PlatformEvent& platform_event) override;
private:
friend class UserActivityDetectorTest;
// Returns |now_for_test_| if set or base::TimeTicks::Now() otherwise.
base::TimeTicks GetCurrentTime() const;
// Processes the event after it has been converted from a PlatformEvent.
void ProcessReceivedEvent(const ui::Event* event);
// 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);
base::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 ui
#endif // UI_BASE_USER_ACTIVITY_USER_ACTIVITY_DETECTOR_H_
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