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26 #ifndef PlatformWheelEvent_h
27 #define PlatformWheelEvent_h
30 #include "PlatformEvent.h"
31 #include <wtf/WindowsExtras.h>
34 typedef struct _GdkEventScroll GdkEventScroll;
38 typedef struct _Evas_Event_Mouse_Wheel Evas_Event_Mouse_Wheel;
46 // Wheel events come in two flavors:
47 // The ScrollByPixelWheelEvent is a fine-grained event that specifies the precise number of pixels to scroll. It is sent directly by MacBook touchpads on OS X,
48 // and synthesized in other cases where platforms generate line-by-line scrolling events.
49 // The ScrollByPageWheelEvent indicates that the wheel event should scroll an entire page. In this case WebCore's built in paging behavior is used to page
50 // up and down (you get the same behavior as if the user was clicking in a scrollbar track to page up or page down).
51 enum PlatformWheelEventGranularity : uint8_t {
52 ScrollByPageWheelEvent,
53 ScrollByPixelWheelEvent,
57 enum PlatformWheelEventPhase : uint8_t {
58 PlatformWheelEventPhaseNone = 0,
59 PlatformWheelEventPhaseBegan = 1 << 0,
60 PlatformWheelEventPhaseStationary = 1 << 1,
61 PlatformWheelEventPhaseChanged = 1 << 2,
62 PlatformWheelEventPhaseEnded = 1 << 3,
63 PlatformWheelEventPhaseCancelled = 1 << 4,
64 PlatformWheelEventPhaseMayBegin = 1 << 5,
68 class PlatformWheelEvent : public PlatformEvent {
71 : PlatformEvent(PlatformEvent::Wheel)
76 , m_granularity(ScrollByPixelWheelEvent)
77 , m_directionInvertedFromDevice(false)
79 , m_hasPreciseScrollingDeltas(false)
80 , m_phase(PlatformWheelEventPhaseNone)
81 , m_momentumPhase(PlatformWheelEventPhaseNone)
83 , m_unacceleratedScrollingDeltaX(0)
84 , m_unacceleratedScrollingDeltaY(0)
89 PlatformWheelEvent(IntPoint position, IntPoint globalPosition, float deltaX, float deltaY, float wheelTicksX, float wheelTicksY, PlatformWheelEventGranularity granularity, bool shiftKey, bool ctrlKey, bool altKey, bool metaKey)
90 : PlatformEvent(PlatformEvent::Wheel, shiftKey, ctrlKey, altKey, metaKey, 0)
91 , m_position(position)
92 , m_globalPosition(globalPosition)
95 , m_wheelTicksX(wheelTicksX)
96 , m_wheelTicksY(wheelTicksY)
97 , m_granularity(granularity)
98 , m_directionInvertedFromDevice(false)
100 , m_hasPreciseScrollingDeltas(false)
101 , m_phase(PlatformWheelEventPhaseNone)
102 , m_momentumPhase(PlatformWheelEventPhaseNone)
104 , m_unacceleratedScrollingDeltaX(0)
105 , m_unacceleratedScrollingDeltaY(0)
110 PlatformWheelEvent copyTurningVerticalTicksIntoHorizontalTicks() const
112 PlatformWheelEvent copy = *this;
114 copy.m_deltaX = copy.m_deltaY;
116 copy.m_wheelTicksX = copy.m_wheelTicksY;
117 copy.m_wheelTicksY = 0;
122 PlatformWheelEvent copyIgnoringHorizontalDelta() const
124 PlatformWheelEvent copy = *this;
129 PlatformWheelEvent copyIgnoringVerticalDelta() const
131 PlatformWheelEvent copy = *this;
136 const IntPoint& position() const { return m_position; } // PlatformWindow coordinates.
137 const IntPoint& globalPosition() const { return m_globalPosition; } // Screen coordinates.
139 float deltaX() const { return m_deltaX; }
140 float deltaY() const { return m_deltaY; }
142 float wheelTicksX() const { return m_wheelTicksX; }
143 float wheelTicksY() const { return m_wheelTicksY; }
145 PlatformWheelEventGranularity granularity() const { return m_granularity; }
147 bool directionInvertedFromDevice() const { return m_directionInvertedFromDevice; }
150 explicit PlatformWheelEvent(GdkEventScroll*);
154 explicit PlatformWheelEvent(const Evas_Event_Mouse_Wheel*);
158 bool hasPreciseScrollingDeltas() const { return m_hasPreciseScrollingDeltas; }
159 void setHasPreciseScrollingDeltas(bool b) { m_hasPreciseScrollingDeltas = b; }
160 PlatformWheelEventPhase phase() const { return m_phase; }
161 PlatformWheelEventPhase momentumPhase() const { return m_momentumPhase; }
162 unsigned scrollCount() const { return m_scrollCount; }
163 float unacceleratedScrollingDeltaX() const { return m_unacceleratedScrollingDeltaX; }
164 float unacceleratedScrollingDeltaY() const { return m_unacceleratedScrollingDeltaY; }
165 bool useLatchedEventElement() const
167 return m_phase == PlatformWheelEventPhaseBegan || m_phase == PlatformWheelEventPhaseChanged
168 || m_momentumPhase == PlatformWheelEventPhaseBegan || m_momentumPhase == PlatformWheelEventPhaseChanged;
170 bool shouldConsiderLatching() const
172 return m_phase == PlatformWheelEventPhaseBegan || m_phase == PlatformWheelEventPhaseMayBegin;
174 bool shouldResetLatching() const
176 if (m_phase == PlatformWheelEventPhaseCancelled || m_phase == PlatformWheelEventPhaseMayBegin)
179 if (m_phase == PlatformWheelEventPhaseNone && m_momentumPhase == PlatformWheelEventPhaseEnded)
185 bool useLatchedEventElement() const { return false; }
189 PlatformWheelEvent(HWND, WPARAM, LPARAM, bool isMouseHWheel);
190 PlatformWheelEvent(HWND, const FloatSize& delta, const FloatPoint& location);
195 IntPoint m_globalPosition;
200 PlatformWheelEventGranularity m_granularity;
201 bool m_directionInvertedFromDevice;
203 bool m_hasPreciseScrollingDeltas;
204 PlatformWheelEventPhase m_phase;
205 PlatformWheelEventPhase m_momentumPhase;
206 unsigned m_scrollCount;
207 float m_unacceleratedScrollingDeltaX;
208 float m_unacceleratedScrollingDeltaY;
212 } // namespace WebCore
214 #endif // PlatformWheelEvent_h