third_party/WebKit/Source/platform/PlatformWheelEvent.h

   1 /*
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  11  *    documentation and/or other materials provided with the distribution.
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  25
  26 #ifndef PlatformWheelEvent_h
  27 #define PlatformWheelEvent_h
  28
  29 #include "platform/PlatformEvent.h"
  30 #include "platform/geometry/IntPoint.h"
  31
  32 namespace blink {
  33
  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,
  42 };
  43
  44 #if OS(MACOSX)
  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,
  53 };
  54 #endif
  55
  56 class PlatformWheelEvent : public PlatformEvent {
  57 public:
  58     PlatformWheelEvent()
  59         : PlatformEvent(PlatformEvent::Wheel)
  60         , m_deltaX(0)
  61         , m_deltaY(0)
  62         , m_wheelTicksX(0)
  63         , m_wheelTicksY(0)
  64         , m_granularity(ScrollByPixelWheelEvent)
  65         , m_hasPreciseScrollingDeltas(false)
  66         , m_canScroll(true)
  67         , m_resendingPluginId(-1)
  68         , m_railsMode(RailsModeFree)
  69 #if OS(MACOSX)
  70         , m_phase(PlatformWheelEventPhaseNone)
  71         , m_momentumPhase(PlatformWheelEventPhaseNone)
  72         , m_canRubberbandLeft(true)
  73         , m_canRubberbandRight(true)
  74 #endif
  75     {
  76     }
  77
  78     PlatformWheelEvent(IntPoint position, IntPoint globalPosition, float deltaX, float deltaY, float wheelTicksX, float wheelTicksY, PlatformWheelEventGranularity granularity, int resendingPluginId, bool shiftKey, bool ctrlKey, bool altKey, bool metaKey)
  79         : PlatformEvent(PlatformEvent::Wheel, shiftKey, ctrlKey, altKey, metaKey, 0)
  80         , m_position(position)
  81         , m_globalPosition(globalPosition)
  82         , m_deltaX(deltaX)
  83         , m_deltaY(deltaY)
  84         , m_wheelTicksX(wheelTicksX)
  85         , m_wheelTicksY(wheelTicksY)
  86         , m_granularity(granularity)
  87         , m_hasPreciseScrollingDeltas(false)
  88         , m_canScroll(true)
  89         , m_resendingPluginId(resendingPluginId)
  90         , m_railsMode(RailsModeFree)
  91 #if OS(MACOSX)
  92         , m_phase(PlatformWheelEventPhaseNone)
  93         , m_momentumPhase(PlatformWheelEventPhaseNone)
  94         , m_canRubberbandLeft(true)
  95         , m_canRubberbandRight(true)
  96 #endif
  97     {
  98     }
  99
 100     const IntPoint& position() const { return m_position; } // PlatformWindow coordinates.
 101     const IntPoint& globalPosition() const { return m_globalPosition; } // Screen coordinates.
 102
 103     float deltaX() const { return m_deltaX; }
 104     float deltaY() const { return m_deltaY; }
 105
 106     float wheelTicksX() const { return m_wheelTicksX; }
 107     float wheelTicksY() const { return m_wheelTicksY; }
 108
 109     PlatformWheelEventGranularity granularity() const { return m_granularity; }
 110
 111     bool hasPreciseScrollingDeltas() const { return m_hasPreciseScrollingDeltas; }
 112     void setHasPreciseScrollingDeltas(bool b) { m_hasPreciseScrollingDeltas = b; }
 113     bool canScroll() const { return m_canScroll; }
 114     void setCanScroll(bool b) { m_canScroll = b; }
 115     int resendingPluginId() const { return m_resendingPluginId; }
 116     RailsMode railsMode() const { return m_railsMode; }
 117
 118 #if OS(MACOSX)
 119     PlatformWheelEventPhase phase() const { return m_phase; }
 120     PlatformWheelEventPhase momentumPhase() const { return m_momentumPhase; }
 121     bool canRubberbandLeft() const { return m_canRubberbandLeft; }
 122     bool canRubberbandRight() const { return m_canRubberbandRight; }
 123 #endif
 124
 125 protected:
 126     IntPoint m_position;
 127     IntPoint m_globalPosition;
 128     float m_deltaX;
 129     float m_deltaY;
 130     float m_wheelTicksX;
 131     float m_wheelTicksY;
 132     PlatformWheelEventGranularity m_granularity;
 133     bool m_hasPreciseScrollingDeltas;
 134     bool m_canScroll;
 135     int m_resendingPluginId;
 136     RailsMode m_railsMode;
 137 #if OS(MACOSX)
 138     PlatformWheelEventPhase m_phase;
 139     PlatformWheelEventPhase m_momentumPhase;
 140     bool m_canRubberbandLeft;
 141     bool m_canRubberbandRight;
 142 #endif
 143 };
 144
 145 } // namespace blink
 146
 147 #endif // PlatformWheelEvent_h