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_GESTURE_PROVIDER_H_
6#define UI_EVENTS_GESTURE_DETECTION_UI_GESTURE_PROVIDER_H_
7
8#include "base/basictypes.h"
9#include "base/memory/scoped_vector.h"
10#include "ui/events/event.h"
11#include "ui/events/events_export.h"
12#include "ui/events/gesture_detection/filtered_gesture_provider.h"
13#include "ui/events/gesture_detection/gesture_event_data_packet.h"
14#include "ui/events/gesture_detection/touch_disposition_gesture_filter.h"
15#include "ui/events/gestures/motion_event_aura.h"
16
17namespace ui {
18
19class EVENTS_EXPORT GestureProviderAuraClient {
20 public:
21  virtual ~GestureProviderAuraClient() {}
22  virtual void OnGestureEvent(GestureEvent* event) = 0;
23};
24
25// Provides gesture detection and dispatch given a sequence of touch events
26// and touch event acks.
27class EVENTS_EXPORT GestureProviderAura : public GestureProviderClient {
28 public:
29  GestureProviderAura(GestureProviderAuraClient* client);
30  virtual ~GestureProviderAura();
31
32  bool OnTouchEvent(const TouchEvent& event);
33  void OnTouchEventAck(bool event_consumed);
34  const MotionEventAura& pointer_state() { return pointer_state_; }
35  ScopedVector<GestureEvent>* GetAndResetPendingGestures();
36
37  // GestureProviderClient implementation
38  virtual void OnGestureEvent(const GestureEventData& gesture) OVERRIDE;
39
40 private:
41  bool IsConsideredDoubleTap(const GestureEventData& previous_tap,
42                             const GestureEventData& current_tap) const;
43
44  scoped_ptr<GestureEventData> previous_tap_;
45
46  GestureProviderAuraClient* client_;
47  MotionEventAura pointer_state_;
48  FilteredGestureProvider filtered_gesture_provider_;
49
50  ui::LatencyInfo last_touch_event_latency_info_;
51  bool handling_event_;
52  ScopedVector<GestureEvent> pending_gestures_;
53
54  DISALLOW_COPY_AND_ASSIGN(GestureProviderAura);
55};
56
57}  // namespace ui
58
59#endif  // UI_EVENTS_GESTURE_DETECTION_UI_GESTURE_PROVIDER_H_
60