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 12 namespace 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. 16 class 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 enum ToolType { 28 TOOL_TYPE_UNKNOWN, 29 TOOL_TYPE_FINGER, 30 TOOL_TYPE_STYLUS, 31 TOOL_TYPE_MOUSE, 32 }; 33 34 enum ButtonType { 35 BUTTON_PRIMARY = 1 << 0, 36 BUTTON_SECONDARY = 1 << 1, 37 BUTTON_TERTIARY = 1 << 2, 38 BUTTON_BACK = 1 << 3, 39 BUTTON_FORWARD = 1 << 4, 40 }; 41 42 // The implementer promises that |GetPointerId()| will never exceed this. 43 enum { MAX_POINTER_ID = 31 }; 44 45 virtual ~MotionEvent() {} 46 47 virtual int GetId() const = 0; 48 virtual Action GetAction() const = 0; 49 // Only valid if |GetAction()| returns ACTION_POINTER_UP or 50 // ACTION_POINTER_DOWN. 51 virtual int GetActionIndex() const = 0; 52 virtual size_t GetPointerCount() const = 0; 53 virtual int GetPointerId(size_t pointer_index) const = 0; 54 virtual float GetX(size_t pointer_index) const = 0; 55 virtual float GetY(size_t pointer_index) const = 0; 56 virtual float GetRawX(size_t pointer_index) const = 0; 57 virtual float GetRawY(size_t pointer_index) const = 0; 58 virtual float GetTouchMajor(size_t pointer_index) const = 0; 59 virtual float GetPressure(size_t pointer_index) const = 0; 60 virtual base::TimeTicks GetEventTime() const = 0; 61 62 virtual size_t GetHistorySize() const = 0; 63 virtual base::TimeTicks GetHistoricalEventTime( 64 size_t historical_index) const = 0; 65 virtual float GetHistoricalTouchMajor(size_t pointer_index, 66 size_t historical_index) const = 0; 67 virtual float GetHistoricalX(size_t pointer_index, 68 size_t historical_index) const = 0; 69 virtual float GetHistoricalY(size_t pointer_index, 70 size_t historical_index) const = 0; 71 virtual ToolType GetToolType(size_t pointer_index) const = 0; 72 virtual int GetButtonState() const = 0; 73 74 virtual scoped_ptr<MotionEvent> Clone() const = 0; 75 virtual scoped_ptr<MotionEvent> Cancel() const = 0; 76 77 // Utility accessor methods for convenience. 78 float GetX() const { return GetX(0); } 79 float GetY() const { return GetY(0); } 80 float GetRawX() const { return GetRawX(0); } 81 float GetRawY() const { return GetRawY(0); } 82 float GetRawOffsetX() const { return GetRawX() - GetX(); } 83 float GetRawOffsetY() const { return GetRawY() - GetY(); } 84 float GetTouchMajor() const { return GetTouchMajor(0); } 85 float GetPressure() const { return GetPressure(0); } 86 }; 87 88 } // namespace ui 89 90 #endif // UI_EVENTS_GESTURE_DETECTION_MOTION_EVENT_H_ 91