1// Copyright 2014 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 UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_
6#define UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_
7
8#include <map>
9
10#include "base/memory/scoped_ptr.h"
11#include "base/time/time.h"
12#include "ui/events/event.h"
13#include "ui/events/events_export.h"
14#include "ui/events/gesture_detection/motion_event.h"
15
16namespace ui {
17
18// Implementation of MotionEvent which takes a stream of ui::TouchEvents.
19class EVENTS_EXPORT MotionEventAura : public MotionEvent {
20 public:
21  MotionEventAura();
22  virtual ~MotionEventAura();
23
24  void OnTouch(const TouchEvent& touch);
25
26  // MotionEvent implementation.
27  virtual int GetId() const OVERRIDE;
28  virtual Action GetAction() const OVERRIDE;
29  virtual int GetActionIndex() const OVERRIDE;
30  virtual size_t GetPointerCount() const OVERRIDE;
31  virtual int GetPointerId(size_t pointer_index) const OVERRIDE;
32  virtual float GetX(size_t pointer_index) const OVERRIDE;
33  virtual float GetY(size_t pointer_index) const OVERRIDE;
34  virtual float GetRawX(size_t pointer_index) const OVERRIDE;
35  virtual float GetRawY(size_t pointer_index) const OVERRIDE;
36  virtual float GetTouchMajor(size_t pointer_index) const OVERRIDE;
37  virtual float GetTouchMinor(size_t pointer_index) const OVERRIDE;
38  virtual float GetOrientation(size_t pointer_index) const OVERRIDE;
39  virtual float GetPressure(size_t pointer_index) const OVERRIDE;
40  virtual ToolType GetToolType(size_t pointer_index) const OVERRIDE;
41  virtual int GetButtonState() const OVERRIDE;
42  virtual int GetFlags() const OVERRIDE;
43  virtual base::TimeTicks GetEventTime() const OVERRIDE;
44
45  virtual scoped_ptr<MotionEvent> Clone() const OVERRIDE;
46  virtual scoped_ptr<MotionEvent> Cancel() const OVERRIDE;
47
48  int GetSourceDeviceId(size_t pointer_index) const;
49
50  // We can't cleanup removed touch points immediately upon receipt of a
51  // TouchCancel or TouchRelease, as the MotionEvent needs to be able to report
52  // information about those touch events. Once the MotionEvent has been
53  // processed, we call CleanupRemovedTouchPoints to do the required
54  // book-keeping.
55  void CleanupRemovedTouchPoints(const TouchEvent& event);
56
57 private:
58  struct PointData {
59    PointData();
60    float x;
61    float y;
62    float raw_x;
63    float raw_y;
64    int touch_id;
65    float pressure;
66    int source_device_id;
67    float touch_major;
68    float touch_minor;
69    float orientation;
70  };
71
72  MotionEventAura(
73      size_t pointer_count,
74      const base::TimeTicks& last_touch_time,
75      Action cached_action,
76      int cached_action_index,
77      int flags,
78      const PointData (&active_touches)[MotionEvent::MAX_TOUCH_POINT_COUNT]);
79
80  static PointData GetPointDataFromTouchEvent(const TouchEvent& touch);
81  void AddTouch(const TouchEvent& touch);
82  void UpdateTouch(const TouchEvent& touch);
83  void UpdateCachedAction(const TouchEvent& touch);
84  size_t GetIndexFromId(int id) const;
85
86  size_t pointer_count_;
87  base::TimeTicks last_touch_time_;
88  Action cached_action_;
89  // The index of the touch responsible for last ACTION_POINTER_DOWN or
90  // ACTION_POINTER_UP. -1 if no such action has occurred.
91  int cached_action_index_;
92  int flags_;
93
94  // We want constant time indexing by pointer_index, and fast indexing by id.
95  PointData active_touches_[MotionEvent::MAX_TOUCH_POINT_COUNT];
96
97  DISALLOW_COPY_AND_ASSIGN(MotionEventAura);
98};
99
100}  // namespace ui
101
102#endif  // UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_
103