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26 #ifndef PlatformWheelEvent_h
27 #define PlatformWheelEvent_h
29 #include "platform/PlatformEvent.h"
30 #include "platform/geometry/IntPoint.h"
34 // Wheel events come in two flavors:
35 // 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,
36 // and synthesized in other cases where platforms generate line-by-line scrolling events.
37 // 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
38 // up and down (you get the same behavior as if the user was clicking in a scrollbar track to page up or page down).
39 enum PlatformWheelEventGranularity {
40 ScrollByPageWheelEvent,
41 ScrollByPixelWheelEvent,
45 enum PlatformWheelEventPhase {
46 PlatformWheelEventPhaseNone = 0,
47 PlatformWheelEventPhaseBegan = 1 << 0,
48 PlatformWheelEventPhaseStationary = 1 << 1,
49 PlatformWheelEventPhaseChanged = 1 << 2,
50 PlatformWheelEventPhaseEnded = 1 << 3,
51 PlatformWheelEventPhaseCancelled = 1 << 4,
52 PlatformWheelEventPhaseMayBegin = 1 << 5,
56 class PlatformWheelEvent : public PlatformEvent {
59 : PlatformEvent(PlatformEvent::Wheel)
64 , m_granularity(ScrollByPixelWheelEvent)
65 , m_hasPreciseScrollingDeltas(false)
67 , m_phase(PlatformWheelEventPhaseNone)
68 , m_momentumPhase(PlatformWheelEventPhaseNone)
69 , m_canRubberbandLeft(true)
70 , m_canRubberbandRight(true)
75 PlatformWheelEvent(IntPoint position, IntPoint globalPosition, float deltaX, float deltaY, float wheelTicksX, float wheelTicksY, PlatformWheelEventGranularity granularity, bool shiftKey, bool ctrlKey, bool altKey, bool metaKey)
76 : PlatformEvent(PlatformEvent::Wheel, shiftKey, ctrlKey, altKey, metaKey, 0)
77 , m_position(position)
78 , m_globalPosition(globalPosition)
81 , m_wheelTicksX(wheelTicksX)
82 , m_wheelTicksY(wheelTicksY)
83 , m_granularity(granularity)
84 , m_hasPreciseScrollingDeltas(false)
86 , m_phase(PlatformWheelEventPhaseNone)
87 , m_momentumPhase(PlatformWheelEventPhaseNone)
88 , m_canRubberbandLeft(true)
89 , m_canRubberbandRight(true)
94 const IntPoint& position() const { return m_position; } // PlatformWindow coordinates.
95 const IntPoint& globalPosition() const { return m_globalPosition; } // Screen coordinates.
97 float deltaX() const { return m_deltaX; }
98 float deltaY() const { return m_deltaY; }
100 float wheelTicksX() const { return m_wheelTicksX; }
101 float wheelTicksY() const { return m_wheelTicksY; }
103 PlatformWheelEventGranularity granularity() const { return m_granularity; }
105 bool hasPreciseScrollingDeltas() const { return m_hasPreciseScrollingDeltas; }
106 void setHasPreciseScrollingDeltas(bool b) { m_hasPreciseScrollingDeltas = b; }
108 PlatformWheelEventPhase phase() const { return m_phase; }
109 PlatformWheelEventPhase momentumPhase() const { return m_momentumPhase; }
110 bool useLatchedEventNode() const { return m_momentumPhase == PlatformWheelEventPhaseBegan || m_momentumPhase == PlatformWheelEventPhaseChanged; }
111 bool canRubberbandLeft() const { return m_canRubberbandLeft; }
112 bool canRubberbandRight() const { return m_canRubberbandRight; }
114 bool useLatchedEventNode() const { return false; }
119 IntPoint m_globalPosition;
124 PlatformWheelEventGranularity m_granularity;
125 bool m_hasPreciseScrollingDeltas;
127 PlatformWheelEventPhase m_phase;
128 PlatformWheelEventPhase m_momentumPhase;
129 bool m_canRubberbandLeft;
130 bool m_canRubberbandRight;
136 #endif // PlatformWheelEvent_h