Eager Gesture Recognition on Aura

ui/events/gestures/gesture_recognizer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_
 #define UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_vector.h"
@@ skipping 10 matching lines @@
   static GestureRecognizer* Create();
   static GestureRecognizer* Get();
   static void Reset();
 
   // List of GestureEvent*.
   typedef ScopedVector<GestureEvent> Gestures;
 
   virtual ~GestureRecognizer() {}
 
   // Invoked for each touch event that could contribute to the current gesture.
+  // Returns false iff the touch event is invalid in some way, and should not be
+  // processed further.
+  virtual bool ProcessTouchEventForGesture(const TouchEvent& event,
+                                           GestureConsumer* consumer) = 0;
+
+  // TODO(tdresser): remove during cleanup of old Aura GR, as part of
+  // crbug.com/332418.
+  // Invoked for each touch event that could contribute to the current gesture.
   // Returns list of zero or more GestureEvents identified after processing
   // TouchEvent.
   // Caller would be responsible for freeing up Gestures.
-  virtual Gestures* ProcessTouchEventForGesture(const TouchEvent& event,
-                                                ui::EventResult result,
-                                                GestureConsumer* consumer) = 0;
+  virtual Gestures* ProcessTouchEventForGestureForOldAuraGR(
+      const TouchEvent& event,
+      ui::EventResult result,
+      GestureConsumer* target) = 0;
+
+  // Sends an ack to the gesture detector, and returns any gestures triggered by
+  // the ack.
+  virtual ScopedVector<GestureEvent>* AckTouchEventForGesture(
+      ui::EventResult result,
+      GestureConsumer* target) = 0;
 
   // This is called when the consumer is destroyed. So this should cleanup any
   // internal state maintained for |consumer|. Returns true iff there was
   // state relating to |consumer| to clean up.
   virtual bool CleanupStateForConsumer(GestureConsumer* consumer) = 0;
 
   // Return the window which should handle this TouchEvent, in the case where
   // the touch is already associated with a target.
   // Otherwise, returns null.
   virtual GestureConsumer* GetTouchLockedTarget(const TouchEvent& event) = 0;
@@ skipping 37 matching lines @@
 
   // Unsubscribes |helper| from async gesture dispatch.
   // Since the GestureRecognizer does not own the |helper|, it is not deleted
   // and must be cleaned up appropriately by the caller.
   virtual void RemoveGestureEventHelper(GestureEventHelper* helper) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_