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      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/events/gestures/gesture_sequence.h"
     18 #include "ui/gfx/point.h"
     19 
     20 namespace ui {
     21 class GestureConsumer;
     22 class GestureEvent;
     23 class GestureEventHelper;
     24 class GestureSequence;
     25 class TouchEvent;
     26 
     27 // TODO(tdresser): Once the unified gesture recognition process sticks
     28 // (crbug.com/332418), GestureRecognizerImpl can be cleaned up
     29 // significantly.
     30 class EVENTS_EXPORT GestureRecognizerImpl : public GestureRecognizer,
     31                                             public GestureSequenceDelegate,
     32                                             public GestureProviderAuraClient {
     33  public:
     34   typedef std::map<int, GestureConsumer*> TouchIdToConsumerMap;
     35 
     36   GestureRecognizerImpl();
     37   virtual ~GestureRecognizerImpl();
     38 
     39   std::vector<GestureEventHelper*>& helpers() { return helpers_; }
     40 
     41   // Overridden from GestureRecognizer
     42   virtual GestureConsumer* GetTouchLockedTarget(
     43       const TouchEvent& event) OVERRIDE;
     44   virtual GestureConsumer* GetTargetForGestureEvent(
     45       const GestureEvent& event) OVERRIDE;
     46   virtual GestureConsumer* GetTargetForLocation(
     47       const gfx::PointF& location, int source_device_id) OVERRIDE;
     48   virtual void TransferEventsTo(GestureConsumer* current_consumer,
     49                                 GestureConsumer* new_consumer) OVERRIDE;
     50   virtual bool GetLastTouchPointForTarget(GestureConsumer* consumer,
     51                                           gfx::PointF* point) OVERRIDE;
     52   virtual bool CancelActiveTouches(GestureConsumer* consumer) OVERRIDE;
     53 
     54  protected:
     55   virtual GestureSequence* GetGestureSequenceForConsumer(GestureConsumer* c);
     56   virtual GestureProviderAura* GetGestureProviderForConsumer(
     57       GestureConsumer* c);
     58   virtual GestureSequence* CreateSequence(
     59       ui::GestureSequenceDelegate* delegate);
     60 
     61  private:
     62   // Sets up the target consumer for gestures based on the touch-event.
     63   void SetupTargets(const TouchEvent& event, GestureConsumer* consumer);
     64   void CancelTouches(std::vector<std::pair<int, GestureConsumer*> >* touches);
     65 
     66   void DispatchGestureEvent(GestureEvent* event);
     67 
     68   // Overridden from GestureRecognizer
     69   virtual Gestures* ProcessTouchEventForGesture(
     70       const TouchEvent& event,
     71       ui::EventResult result,
     72       GestureConsumer* target) OVERRIDE;
     73   virtual bool CleanupStateForConsumer(GestureConsumer* consumer)
     74       OVERRIDE;
     75   virtual void AddGestureEventHelper(GestureEventHelper* helper) OVERRIDE;
     76   virtual void RemoveGestureEventHelper(GestureEventHelper* helper) OVERRIDE;
     77 
     78   // Overridden from ui::GestureSequenceDelegate.
     79   virtual void DispatchPostponedGestureEvent(GestureEvent* event) OVERRIDE;
     80 
     81   // Overridden from GestureProviderAuraClient
     82   virtual void OnGestureEvent(GestureEvent* event) OVERRIDE;
     83 
     84   // Convenience method to find the GestureEventHelper that can dispatch events
     85   // to a specific |consumer|.
     86   GestureEventHelper* FindDispatchHelperForConsumer(GestureConsumer* consumer);
     87 
     88   std::map<GestureConsumer*, GestureSequence*> consumer_sequence_;
     89   std::map<GestureConsumer*, GestureProviderAura*> consumer_gesture_provider_;
     90 
     91   // Both |touch_id_target_| and |touch_id_target_for_gestures_| map a touch-id
     92   // to its target window.  touch-ids are removed from |touch_id_target_| on
     93   // ET_TOUCH_RELEASE and ET_TOUCH_CANCEL. |touch_id_target_for_gestures_| are
     94   // removed in ConsumerDestroyed().
     95   TouchIdToConsumerMap touch_id_target_;
     96   TouchIdToConsumerMap touch_id_target_for_gestures_;
     97 
     98   std::vector<GestureEventHelper*> helpers_;
     99 
    100   bool use_unified_gesture_detector_;
    101 
    102   DISALLOW_COPY_AND_ASSIGN(GestureRecognizerImpl);
    103 };
    104 
    105 // Provided only for testing:
    106 EVENTS_EXPORT void SetGestureRecognizerForTesting(
    107     GestureRecognizer* gesture_recognizer);
    108 
    109 }  // namespace ui
    110 
    111 #endif  // UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_IMPL_H_
    112