Source/WebCore/dom/ios/PointerEventIOS.cpp

/*
 * Copyright (C) 2018 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    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. AND ITS CONTRIBUTORS ``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 ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#import "config.h"
#import "PointerEvent.h"

#if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)

#import "EventNames.h"

namespace WebCore {

static const AtomString& pointerEventType(PlatformTouchPoint::TouchPhaseType phase)
{
    switch (phase) {
    case PlatformTouchPoint::TouchPhaseBegan:
        return eventNames().pointerdownEvent;
    case PlatformTouchPoint::TouchPhaseMoved:
        return eventNames().pointermoveEvent;
    case PlatformTouchPoint::TouchPhaseStationary:
        return eventNames().pointermoveEvent;
    case PlatformTouchPoint::TouchPhaseEnded:
        return eventNames().pointerupEvent;
    case PlatformTouchPoint::TouchPhaseCancelled:
        return eventNames().pointercancelEvent;
    }
    ASSERT_NOT_REACHED();
    return nullAtom();
}

static short buttonForType(const AtomString& type)
{
    return type == eventNames().pointermoveEvent ? -1 : 0;
}

static unsigned short buttonsForType(const AtomString& type)
{
    // We have contact with the touch surface for most events except when we've released the touch or canceled it.
    auto& eventNames = WebCore::eventNames();
    return (type == eventNames.pointerupEvent || type == eventNames.pointeroutEvent || type == eventNames.pointerleaveEvent || type == eventNames.pointercancelEvent) ? 0 : 1;
}

Ref<PointerEvent> PointerEvent::create(const PlatformTouchEvent& event, unsigned index, bool isPrimary, Ref<WindowProxy>&& view)
{
    const auto& type = pointerEventType(event.touchPhaseAtIndex(index));
    return adoptRef(*new PointerEvent(type, event, typeIsCancelable(type), index, isPrimary, WTFMove(view)));
}

Ref<PointerEvent> PointerEvent::create(const AtomString& type, const PlatformTouchEvent& event, unsigned index, bool isPrimary, Ref<WindowProxy>&& view)
{
    return adoptRef(*new PointerEvent(type, event, typeIsCancelable(type), index, isPrimary, WTFMove(view)));
}

PointerEvent::PointerEvent(const AtomString& type, const PlatformTouchEvent& event, IsCancelable isCancelable, unsigned index, bool isPrimary, Ref<WindowProxy>&& view)
    : MouseEvent(type, typeCanBubble(type), isCancelable, typeIsComposed(type), event.timestamp().approximateMonotonicTime(), WTFMove(view), 0, event.touchLocationAtIndex(index), event.touchLocationAtIndex(index), { }, event.modifiers(), buttonForType(type), buttonsForType(type), nullptr, 0, 0, IsSimulated::No, IsTrusted::Yes)
    , m_pointerId(event.touchIdentifierAtIndex(index))
    , m_width(2 * event.radiusXAtIndex(index))
    , m_height(2 * event.radiusYAtIndex(index))
    , m_pressure(event.forceAtIndex(index))
    , m_pointerType(event.touchTypeAtIndex(index) == PlatformTouchPoint::TouchType::Stylus ? penPointerEventType() : touchPointerEventType())
    , m_isPrimary(isPrimary)
{
    // See https://github.com/w3c/pointerevents/issues/274. We might expose the azimuth and altitude
    // directly as well as the tilt.
    double azimuthAngle = event.azimuthAngleAtIndex(index);
    double altitudeAngle = event.altitudeAngleAtIndex(index);

    m_tiltX = round(cos(azimuthAngle) * cos(altitudeAngle) * 90);
    m_tiltY = round(sin(azimuthAngle) * cos(altitudeAngle) * 90);
}

} // namespace WebCore

#endif // ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)