ui/events/gestures/gesture_provider_aura.h

   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
  17 namespace ui {
  18
  19 class 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.
  27 class EVENTS_EXPORT GestureProviderAura : public GestureProviderClient {
  28  public:
  29   GestureProviderAura(GestureProviderAuraClient* client);
  30   ~GestureProviderAura() override;
  31
  32   bool OnTouchEvent(TouchEvent* event);
  33   void OnAsyncTouchEventAck(bool event_consumed);
  34   void OnSyncTouchEventAck(const uint64 unique_event_id, bool event_consumed);
  35   const MotionEventAura& pointer_state() { return pointer_state_; }
  36   ScopedVector<GestureEvent>* GetAndResetPendingGestures();
  37
  38   // GestureProviderClient implementation
  39   void OnGestureEvent(const GestureEventData& gesture) override;
  40
  41  private:
  42   bool IsConsideredDoubleTap(const GestureEventData& previous_tap,
  43                              const GestureEventData& current_tap) const;
  44
  45   scoped_ptr<GestureEventData> previous_tap_;
  46
  47   GestureProviderAuraClient* client_;
  48   MotionEventAura pointer_state_;
  49   FilteredGestureProvider filtered_gesture_provider_;
  50
  51   bool handling_event_;
  52   ScopedVector<GestureEvent> pending_gestures_;
  53   uint64 last_unique_touch_event_id_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(GestureProviderAura);
  56 };
  57
  58 }  // namespace ui
  59
  60 #endif  // UI_EVENTS_GESTURE_DETECTION_UI_GESTURE_PROVIDER_H_