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| 1 // Copyright (c) 2011 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 VIEWS_TOUCHUI_GESTURE_MANAGER_H_ | |
| 6 #define VIEWS_TOUCHUI_GESTURE_MANAGER_H_ | |
| 7 #pragma once | |
| 8 | |
| 9 #include "base/memory/singleton.h" | |
| 10 #include "views/view.h" | |
| 11 | |
| 12 namespace ui { | |
| 13 enum TouchStatus; | |
| 14 } | |
| 15 | |
| 16 namespace views { | |
| 17 class TouchEvent; | |
| 18 | |
| 19 // A GestureManager singleton detects gestures occurring in the | |
| 20 // incoming feed of touch events across all of the RootViews in | |
| 21 // the system. In response to a given touch event, the GestureManager | |
| 22 // updates its internal state and optionally dispatches synthetic | |
| 23 // events to the invoking view. | |
| 24 // | |
| 25 class VIEWS_EXPORT GestureManager { | |
| 26 public: | |
| 27 virtual ~GestureManager(); | |
| 28 | |
| 29 static GestureManager* GetInstance(); | |
| 30 | |
| 31 // Invoked for each touch event that could contribute to the current gesture. | |
| 32 // Takes the event and the View that originated it and which will also | |
| 33 // be the target of any generated synthetic event. Finally, status | |
| 34 // specifies if a touch sequence is in progress or not, so that the | |
| 35 // GestureManager state can correctly reflect events that are handled | |
| 36 // already. | |
| 37 // Returns true if the event resulted in firing a synthetic event. | |
| 38 virtual bool ProcessTouchEventForGesture(const TouchEvent& event, | |
| 39 View* source, | |
| 40 ui::TouchStatus status); | |
| 41 | |
| 42 // TODO(rjkroege): Write the remainder of this class. | |
| 43 // It will appear in a subsequent CL. | |
| 44 | |
| 45 protected: | |
| 46 GestureManager(); | |
| 47 | |
| 48 private: | |
| 49 friend struct DefaultSingletonTraits<GestureManager>; | |
| 50 | |
| 51 DISALLOW_COPY_AND_ASSIGN(GestureManager); | |
| 52 }; | |
| 53 | |
| 54 | |
| 55 } // namespace views | |
| 56 | |
| 57 #endif // VIEWS_TOUCHUI_GESTURE_MANAGER_H_ | |
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