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/*
* Copyright (C) 2004-2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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 {
// The ScrollByPixelWheelEvent is a fine-grained event that specifies the precise number of pixels to scroll.
// It is sent directly by touch pads on macOS, or synthesized when platforms generate line-by-line scrolling events.
//
// The ScrollByPageWheelEvent indicates that the wheel event should scroll an entire page.
// In this case, WebKit built in paging behavior is used to page up and down.
// This yields the same behavior as clicking in a scrollbar track to page up and down.
enum PlatformWheelEventGranularity : uint8_t {
ScrollByPageWheelEvent,
ScrollByPixelWheelEvent,
};
#if PLATFORM(COCOA)
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
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, 0)
, m_position(position)
, m_globalPosition(globalPosition)
, m_deltaX(deltaX)
, m_deltaY(deltaY)
, m_wheelTicksX(wheelTicksX)
, m_wheelTicksY(wheelTicksY)
, m_granularity(granularity)
{
}
PlatformWheelEvent copyTurningVerticalTicksIntoHorizontalTicks() const
{
PlatformWheelEvent copy = *this;
copy.m_deltaX = copy.m_deltaY;
copy.m_deltaY = 0;
copy.m_wheelTicksX = copy.m_wheelTicksY;
copy.m_wheelTicksY = 0;
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; } // PlatformWindow coordinates.
const IntPoint& globalPosition() const { return m_globalPosition; } // Screen coordinates.
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*);
#endif
#if PLATFORM(COCOA)
bool hasPreciseScrollingDeltas() const { return m_hasPreciseScrollingDeltas; }
void setHasPreciseScrollingDeltas(bool hasPreciseScrollingDeltas) { m_hasPreciseScrollingDeltas = hasPreciseScrollingDeltas; }
PlatformWheelEventPhase phase() const { return m_phase; }
PlatformWheelEventPhase momentumPhase() const { return m_momentumPhase; }
unsigned scrollCount() const { return m_scrollCount; }
float unacceleratedScrollingDeltaX() const { return m_unacceleratedScrollingDeltaX; }
float unacceleratedScrollingDeltaY() const { return m_unacceleratedScrollingDeltaY; }
bool useLatchedEventElement() const;
bool shouldConsiderLatching() const;
bool shouldResetLatching() const;
bool isEndOfMomentumScroll() const;
bool isEndOfNonMomentumScroll() const;
bool isTransitioningToMomentumScroll() const;
#else
bool useLatchedEventElement() const { return false; }
#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 };
// Scrolling velocity in pixels per second.
FloatSize m_scrollingVelocity;
#if PLATFORM(COCOA)
bool m_hasPreciseScrollingDeltas { false };
PlatformWheelEventPhase m_phase { PlatformWheelEventPhaseNone };
PlatformWheelEventPhase m_momentumPhase { PlatformWheelEventPhaseNone };
unsigned m_scrollCount { 0 };
float m_unacceleratedScrollingDeltaX { 0 };
float m_unacceleratedScrollingDeltaY { 0 };
#endif
};
#if PLATFORM(COCOA)
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;
}
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
} // namespace WebCore
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