src/ui/events/gestures/gesture_recognizer_impl.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 UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_IMPL_H_
   6 #define UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_IMPL_H_
   7
   8 #include <map>
   9 #include <vector>
  10
  11 #include "base/memory/linked_ptr.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "ui/events/event_constants.h"
  14 #include "ui/events/events_export.h"
  15 #include "ui/events/gestures/gesture_provider_aura.h"
  16 #include "ui/events/gestures/gesture_recognizer.h"
  17 #include "ui/gfx/point.h"
  18
  19 namespace ui {
  20 class GestureConsumer;
  21 class GestureEvent;
  22 class GestureEventHelper;
  23 class TouchEvent;
  24
  25 // TODO(tdresser): Once the unified gesture recognition process sticks
  26 // (crbug.com/332418), GestureRecognizerImpl can be cleaned up
  27 // significantly.
  28 class EVENTS_EXPORT GestureRecognizerImpl : public GestureRecognizer,
  29                                             public GestureProviderAuraClient {
  30  public:
  31   typedef std::map<int, GestureConsumer*> TouchIdToConsumerMap;
  32
  33   GestureRecognizerImpl();
  34   ~GestureRecognizerImpl() override;
  35
  36   std::vector<GestureEventHelper*>& helpers() { return helpers_; }
  37
  38   // Overridden from GestureRecognizer
  39   GestureConsumer* GetTouchLockedTarget(const TouchEvent& event) override;
  40   GestureConsumer* GetTargetForGestureEvent(const GestureEvent& event) override;
  41   GestureConsumer* GetTargetForLocation(const gfx::PointF& location,
  42                                         int source_device_id) override;
  43   void TransferEventsTo(GestureConsumer* current_consumer,
  44                         GestureConsumer* new_consumer) override;
  45   bool GetLastTouchPointForTarget(GestureConsumer* consumer,
  46                                   gfx::PointF* point) override;
  47   bool CancelActiveTouches(GestureConsumer* consumer) override;
  48
  49  protected:
  50   virtual GestureProviderAura* GetGestureProviderForConsumer(
  51       GestureConsumer* c);
  52
  53  private:
  54   // Sets up the target consumer for gestures based on the touch-event.
  55   void SetupTargets(const TouchEvent& event, GestureConsumer* consumer);
  56
  57   void DispatchGestureEvent(GestureEvent* event);
  58
  59   // Overridden from GestureRecognizer
  60   bool ProcessTouchEventPreDispatch(const TouchEvent& event,
  61                                     GestureConsumer* consumer) override;
  62
  63   Gestures* ProcessTouchEventPostDispatch(const TouchEvent& event,
  64                                           ui::EventResult result,
  65                                           GestureConsumer* consumer) override;
  66
  67   Gestures* ProcessTouchEventOnAsyncAck(const TouchEvent& event,
  68                                         ui::EventResult result,
  69                                         GestureConsumer* consumer) override;
  70
  71   bool CleanupStateForConsumer(GestureConsumer* consumer) override;
  72   void AddGestureEventHelper(GestureEventHelper* helper) override;
  73   void RemoveGestureEventHelper(GestureEventHelper* helper) override;
  74
  75   // Overridden from GestureProviderAuraClient
  76   void OnGestureEvent(GestureEvent* event) override;
  77
  78   // Convenience method to find the GestureEventHelper that can dispatch events
  79   // to a specific |consumer|.
  80   GestureEventHelper* FindDispatchHelperForConsumer(GestureConsumer* consumer);
  81   std::map<GestureConsumer*, GestureProviderAura*> consumer_gesture_provider_;
  82
  83   // Both |touch_id_target_| and |touch_id_target_for_gestures_| map a touch-id
  84   // to its target window.  touch-ids are removed from |touch_id_target_| on
  85   // ET_TOUCH_RELEASE and ET_TOUCH_CANCEL. |touch_id_target_for_gestures_| are
  86   // removed in ConsumerDestroyed().
  87   TouchIdToConsumerMap touch_id_target_;
  88   TouchIdToConsumerMap touch_id_target_for_gestures_;
  89
  90   std::vector<GestureEventHelper*> helpers_;
  91
  92   DISALLOW_COPY_AND_ASSIGN(GestureRecognizerImpl);
  93 };
  94
  95 // Provided only for testing:
  96 EVENTS_EXPORT void SetGestureRecognizerForTesting(
  97     GestureRecognizer* gesture_recognizer);
  98
  99 }  // namespace ui
 100
 101 #endif  // UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_IMPL_H_