motion_event.h revision 010d83a9304c5a91596085d917d248abff47903a
1// Copyright 2014 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_GESTURE_DETECTION_MOTION_EVENT_H_ 6#define UI_EVENTS_GESTURE_DETECTION_MOTION_EVENT_H_ 7 8#include "base/memory/scoped_ptr.h" 9#include "base/time/time.h" 10#include "ui/events/gesture_detection/gesture_detection_export.h" 11 12namespace ui { 13 14// Abstract class for a generic motion-related event, patterned after that 15// subset of Android's MotionEvent API used in gesture detection. 16class GESTURE_DETECTION_EXPORT MotionEvent { 17 public: 18 enum Action { 19 ACTION_DOWN, 20 ACTION_UP, 21 ACTION_MOVE, 22 ACTION_CANCEL, 23 ACTION_POINTER_DOWN, 24 ACTION_POINTER_UP, 25 }; 26 27 // The implementer promises that |GetPointerId()| will never exceed this. 28 enum { MAX_POINTER_ID = 31 }; 29 30 virtual ~MotionEvent() {} 31 32 virtual int GetId() const = 0; 33 virtual Action GetAction() const = 0; 34 // Only valid if |GetAction()| returns ACTION_POINTER_UP or 35 // ACTION_POINTER_DOWN. 36 virtual int GetActionIndex() const = 0; 37 virtual size_t GetPointerCount() const = 0; 38 virtual int GetPointerId(size_t pointer_index) const = 0; 39 virtual float GetX(size_t pointer_index) const = 0; 40 virtual float GetY(size_t pointer_index) const = 0; 41 virtual float GetTouchMajor(size_t pointer_index) const = 0; 42 virtual float GetPressure(size_t pointer_index) const = 0; 43 virtual base::TimeTicks GetEventTime() const = 0; 44 45 virtual size_t GetHistorySize() const = 0; 46 virtual base::TimeTicks GetHistoricalEventTime( 47 size_t historical_index) const = 0; 48 virtual float GetHistoricalTouchMajor(size_t pointer_index, 49 size_t historical_index) const = 0; 50 virtual float GetHistoricalX(size_t pointer_index, 51 size_t historical_index) const = 0; 52 virtual float GetHistoricalY(size_t pointer_index, 53 size_t historical_index) const = 0; 54 55 virtual scoped_ptr<MotionEvent> Clone() const = 0; 56 virtual scoped_ptr<MotionEvent> Cancel() const = 0; 57 58 // Utility accessor methods for convenience. 59 float GetX() const { return GetX(0); } 60 float GetY() const { return GetY(0); } 61 float GetRawX() const { return GetX(); } 62 float GetRawY() const { return GetY(); } 63 float GetTouchMajor() const { return GetTouchMajor(0); } 64 float GetPressure() const { return GetPressure(0); } 65}; 66 67} // namespace ui 68 69#endif // UI_EVENTS_GESTURE_DETECTION_MOTION_EVENT_H_ 70