PlatformWheelEvent.h [plain text]
#pragma once
#include "FloatPoint.h"
#include "IntPoint.h"
#include "PlatformEvent.h"
#include <wtf/WindowsExtras.h>
#if PLATFORM(GTK)
typedef struct _GdkEventScroll GdkEventScroll;
#endif
namespace WebCore {
enum PlatformWheelEventGranularity : uint8_t {
ScrollByPageWheelEvent,
ScrollByPixelWheelEvent,
};
#if ENABLE(ASYNC_SCROLLING)
enum PlatformWheelEventPhase : uint8_t {
PlatformWheelEventPhaseNone = 0,
PlatformWheelEventPhaseBegan = 1 << 0,
PlatformWheelEventPhaseStationary = 1 << 1,
PlatformWheelEventPhaseChanged = 1 << 2,
PlatformWheelEventPhaseEnded = 1 << 3,
PlatformWheelEventPhaseCancelled = 1 << 4,
PlatformWheelEventPhaseMayBegin = 1 << 5,
};
#endif
#if PLATFORM(WIN)
const float cScrollbarPixelsPerLine = 100.0f / 3.0f;
#endif
class PlatformWheelEvent : public PlatformEvent {
public:
PlatformWheelEvent()
: PlatformEvent(PlatformEvent::Wheel)
{
}
PlatformWheelEvent(IntPoint position, IntPoint globalPosition, float deltaX, float deltaY, float wheelTicksX, float wheelTicksY, PlatformWheelEventGranularity granularity, bool shiftKey, bool ctrlKey, bool altKey, bool metaKey)
: PlatformEvent(PlatformEvent::Wheel, shiftKey, ctrlKey, altKey, metaKey, { })
, m_position(position)
, m_globalPosition(globalPosition)
, m_deltaX(deltaX)
, m_deltaY(deltaY)
, m_wheelTicksX(wheelTicksX)
, m_wheelTicksY(wheelTicksY)
, m_granularity(granularity)
{
}
PlatformWheelEvent copySwappingDirection() const
{
PlatformWheelEvent copy = *this;
std::swap(copy.m_deltaX, copy.m_deltaY);
std::swap(copy.m_wheelTicksX, copy.m_wheelTicksY);
return copy;
}
PlatformWheelEvent copyWithDeltasAndVelocity(float deltaX, float deltaY, const FloatSize& velocity) const
{
PlatformWheelEvent copy = *this;
copy.m_deltaX = deltaX;
copy.m_deltaY = deltaY;
copy.m_scrollingVelocity = velocity;
return copy;
}
const IntPoint& position() const { return m_position; } const IntPoint& globalPosition() const { return m_globalPosition; }
float deltaX() const { return m_deltaX; }
float deltaY() const { return m_deltaY; }
float wheelTicksX() const { return m_wheelTicksX; }
float wheelTicksY() const { return m_wheelTicksY; }
PlatformWheelEventGranularity granularity() const { return m_granularity; }
bool directionInvertedFromDevice() const { return m_directionInvertedFromDevice; }
const FloatSize& scrollingVelocity() const { return m_scrollingVelocity; }
#if PLATFORM(GTK)
explicit PlatformWheelEvent(GdkEventScroll*);
FloatPoint swipeVelocity() const;
#endif
#if PLATFORM(COCOA)
bool hasPreciseScrollingDeltas() const { return m_hasPreciseScrollingDeltas; }
void setHasPreciseScrollingDeltas(bool hasPreciseScrollingDeltas) { m_hasPreciseScrollingDeltas = hasPreciseScrollingDeltas; }
unsigned scrollCount() const { return m_scrollCount; }
float unacceleratedScrollingDeltaX() const { return m_unacceleratedScrollingDeltaX; }
float unacceleratedScrollingDeltaY() const { return m_unacceleratedScrollingDeltaY; }
#endif
#if ENABLE(ASYNC_SCROLLING)
bool useLatchedEventElement() const;
bool shouldConsiderLatching() const;
bool shouldResetLatching() const;
bool isEndOfMomentumScroll() const;
#else
bool useLatchedEventElement() const { return false; }
#endif
#if ENABLE(ASYNC_SCROLLING)
PlatformWheelEventPhase phase() const { return m_phase; }
PlatformWheelEventPhase momentumPhase() const { return m_momentumPhase; }
bool isEndOfNonMomentumScroll() const;
bool isTransitioningToMomentumScroll() const;
#endif
#if PLATFORM(WIN)
PlatformWheelEvent(HWND, WPARAM, LPARAM, bool isMouseHWheel);
PlatformWheelEvent(HWND, const FloatSize& delta, const FloatPoint& location);
#endif
protected:
IntPoint m_position;
IntPoint m_globalPosition;
float m_deltaX { 0 };
float m_deltaY { 0 };
float m_wheelTicksX { 0 };
float m_wheelTicksY { 0 };
PlatformWheelEventGranularity m_granularity { ScrollByPixelWheelEvent };
bool m_directionInvertedFromDevice { false };
FloatSize m_scrollingVelocity;
#if ENABLE(ASYNC_SCROLLING)
PlatformWheelEventPhase m_phase { PlatformWheelEventPhaseNone };
PlatformWheelEventPhase m_momentumPhase { PlatformWheelEventPhaseNone };
#endif
#if PLATFORM(COCOA)
bool m_hasPreciseScrollingDeltas { false };
unsigned m_scrollCount { 0 };
float m_unacceleratedScrollingDeltaX { 0 };
float m_unacceleratedScrollingDeltaY { 0 };
#endif
};
#if ENABLE(ASYNC_SCROLLING)
inline bool PlatformWheelEvent::useLatchedEventElement() const
{
return m_phase == PlatformWheelEventPhaseBegan
|| m_phase == PlatformWheelEventPhaseChanged
|| m_momentumPhase == PlatformWheelEventPhaseBegan
|| m_momentumPhase == PlatformWheelEventPhaseChanged
|| (m_phase == PlatformWheelEventPhaseEnded && m_momentumPhase == PlatformWheelEventPhaseNone);
}
inline bool PlatformWheelEvent::shouldConsiderLatching() const
{
return m_phase == PlatformWheelEventPhaseBegan || m_phase == PlatformWheelEventPhaseMayBegin;
}
inline bool PlatformWheelEvent::shouldResetLatching() const
{
return m_phase == PlatformWheelEventPhaseCancelled || m_phase == PlatformWheelEventPhaseMayBegin || isEndOfMomentumScroll();
}
inline bool PlatformWheelEvent::isEndOfMomentumScroll() const
{
return m_phase == PlatformWheelEventPhaseNone && m_momentumPhase == PlatformWheelEventPhaseEnded;
}
#endif
#if PLATFORM(COCOA) || PLATFORM(GTK)
inline bool PlatformWheelEvent::isEndOfNonMomentumScroll() const
{
return m_phase == PlatformWheelEventPhaseEnded && m_momentumPhase == PlatformWheelEventPhaseNone;
}
inline bool PlatformWheelEvent::isTransitioningToMomentumScroll() const
{
return m_phase == PlatformWheelEventPhaseNone && m_momentumPhase == PlatformWheelEventPhaseBegan;
}
#endif
}