ash/wm/user_activity_detector.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef ASH_WM_USER_ACTIVITY_DETECTOR_H_
   6 #define ASH_WM_USER_ACTIVITY_DETECTOR_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "base/basictypes.h"
  10 #include "base/compiler_specific.h"
  11 #include "base/observer_list.h"
  12 #include "base/time.h"
  13 #include "ui/base/events/event_handler.h"
  14
  15 namespace ash {
  16
  17 class UserActivityObserver;
  18
  19 // Watches for input events and notifies observers that the user is active.
  20 class ASH_EXPORT UserActivityDetector : public ui::EventHandler {
  21  public:
  22   // Minimum amount of time between notifications to observers.
  23   static const int kNotifyIntervalMs;
  24
  25   // Amount of time that mouse events should be ignored after notification
  26   // is received that displays' power states are being changed.
  27   static const int kDisplayPowerChangeIgnoreMouseMs;
  28
  29   UserActivityDetector();
  30   virtual ~UserActivityDetector();
  31
  32   base::TimeTicks last_activity_time() const { return last_activity_time_; }
  33
  34   void set_now_for_test(base::TimeTicks now) { now_for_test_ = now; }
  35
  36   bool HasObserver(UserActivityObserver* observer) const;
  37   void AddObserver(UserActivityObserver* observer);
  38   void RemoveObserver(UserActivityObserver* observer);
  39
  40   // Called when displays are about to be turned on or off.
  41   void OnDisplayPowerChanging();
  42
  43   // ui::EventHandler implementation.
  44   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
  45   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
  46   virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
  47   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
  48   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
  49
  50  private:
  51   // Returns |now_for_test_| if set or base::TimeTicks::Now() otherwise.
  52   base::TimeTicks GetCurrentTime() const;
  53
  54   // Updates |last_activity_time_|.  Additionally notifies observers and
  55   // updates |last_observer_notification_time_| if enough time has passed
  56   // since the last notification.
  57   void HandleActivity();
  58
  59   ObserverList<UserActivityObserver> observers_;
  60
  61   // Last time at which user activity was observed.
  62   base::TimeTicks last_activity_time_;
  63
  64   // Last time at which we notified observers that the user was active.
  65   base::TimeTicks last_observer_notification_time_;
  66
  67   // If set, used when the current time is needed.  This can be set by tests to
  68   // simulate the passage of time.
  69   base::TimeTicks now_for_test_;
  70
  71   // If set, mouse events will be ignored until this time is reached. This
  72   // is to avoid reporting mouse events that occur when displays are turned
  73   // on or off as user activity.
  74   base::TimeTicks honor_mouse_events_time_;
  75
  76   DISALLOW_COPY_AND_ASSIGN(UserActivityDetector);
  77 };
  78
  79 }  // namespace ash
  80
  81 #endif  // ASH_WM_USER_ACTIVITY_DETECTOR_H_