Adding Gesture Recognition to RenderWidgetHostViewWin (web client)

ui/base/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_BASE_GESTURES_GESTURE_RECOGNIZER_H_
 #define UI_BASE_GESTURES_GESTURE_RECOGNIZER_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 20 matching lines @@
   // Caller would be responsible for freeing up Gestures.
   virtual Gestures* ProcessTouchEventForGesture(const TouchEvent& event,
                                                 ui::TouchStatus status,
                                                 GestureConsumer* consumer) = 0;
 
   // Touch-events can be queued to be played back at a later time. The queues
   // are identified by the target window.
   virtual void QueueTouchEventForGesture(GestureConsumer* consumer,
                                          const TouchEvent& event) = 0;
 
+  // Returns true if the touch queue is empty.
+  virtual bool IsQueueEmpty(GestureConsumer* consumer) = 0;
+
   // Process the touch-event in the queue for the window. Returns a list of
   // zero or more GestureEvents identified after processing the queueud
   // TouchEvent. Caller is responsible for freeing up Gestures.
   virtual Gestures* AdvanceTouchQueue(GestureConsumer* consumer,
                                       bool processed) = 0;
 
   // Flushes the touch event queue (or removes the queue) for the window.
   virtual void FlushTouchQueue(GestureConsumer* consumer) = 0;
 
   // Return the window which should handle this TouchEvent, in the case where
@@ skipping 11 matching lines @@
 
   // For each touch on windows other than |capturer|, a cancel event
   // is fired.  These touches are then ignored until they are released
   // and pressed again.
   virtual void CancelNonCapturedTouches(GestureConsumer* capturer) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_GESTURES_GESTURE_RECOGNIZER_H_