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/*
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
* Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2003, 2005, 2006, 2008, 2010, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2013 Samsung Electronics. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "WheelEvent.h"
#include "DataTransfer.h"
#include "EventNames.h"
#include "PlatformMouseEvent.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/MathExtras.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(WheelEvent);
inline static unsigned determineDeltaMode(const PlatformWheelEvent& event)
{
return event.granularity() == ScrollByPageWheelEvent ? WheelEvent::DOM_DELTA_PAGE : WheelEvent::DOM_DELTA_PIXEL;
}
static double wheelDeltaToDelta(int wheelDelta)
{
// Avoid returning negative zero.
if (!wheelDelta)
return 0;
return -static_cast<double>(wheelDelta);
}
inline WheelEvent::WheelEvent() = default;
inline WheelEvent::WheelEvent(const AtomString& type, const Init& initializer)
: MouseEvent(type, initializer)
, m_wheelDelta(initializer.wheelDeltaX ? initializer.wheelDeltaX : clampTo<int>(-initializer.deltaX), initializer.wheelDeltaY ? initializer.wheelDeltaY : clampTo<int>(-initializer.deltaY))
, m_deltaX(initializer.deltaX ? initializer.deltaX : wheelDeltaToDelta(initializer.wheelDeltaX))
, m_deltaY(initializer.deltaY ? initializer.deltaY : wheelDeltaToDelta(initializer.wheelDeltaY))
, m_deltaZ(initializer.deltaZ)
, m_deltaMode(initializer.deltaMode)
{
}
inline WheelEvent::WheelEvent(const PlatformWheelEvent& event, RefPtr<WindowProxy>&& view, IsCancelable isCancelable)
: MouseEvent(eventNames().wheelEvent, CanBubble::Yes, isCancelable, IsComposed::Yes, event.timestamp().approximateMonotonicTime(), WTFMove(view), 0,
event.globalPosition(), event.position() , 0, 0, event.modifiers(), 0, 0, nullptr, 0, SyntheticClickType::NoTap, IsSimulated::No, IsTrusted::Yes)
, m_wheelDelta(event.wheelTicksX() * TickMultiplier, event.wheelTicksY() * TickMultiplier)
, m_deltaX(-event.deltaX())
, m_deltaY(-event.deltaY())
, m_deltaMode(determineDeltaMode(event))
, m_underlyingPlatformEvent(event)
{
}
Ref<WheelEvent> WheelEvent::create(const PlatformWheelEvent& event, RefPtr<WindowProxy>&& view, IsCancelable isCancelable)
{
return adoptRef(*new WheelEvent(event, WTFMove(view), isCancelable));
}
Ref<WheelEvent> WheelEvent::createForBindings()
{
return adoptRef(*new WheelEvent);
}
Ref<WheelEvent> WheelEvent::create(const AtomString& type, const Init& initializer)
{
return adoptRef(*new WheelEvent(type, initializer));
}
void WheelEvent::initWebKitWheelEvent(int rawDeltaX, int rawDeltaY, RefPtr<WindowProxy>&& view, int screenX, int screenY, int pageX, int pageY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
{
if (isBeingDispatched())
return;
initMouseEvent(eventNames().wheelEvent, true, true, WTFMove(view), 0, screenX, screenY, pageX, pageY, ctrlKey, altKey, shiftKey, metaKey, 0, nullptr);
// Normalize to 120 multiple for compatibility with IE.
m_wheelDelta = { rawDeltaX * TickMultiplier, rawDeltaY * TickMultiplier };
m_deltaX = wheelDeltaToDelta(rawDeltaX);
m_deltaY = wheelDeltaToDelta(rawDeltaY);
m_deltaMode = DOM_DELTA_PIXEL;
m_underlyingPlatformEvent = std::nullopt;
}
EventInterface WheelEvent::eventInterface() const
{
return WheelEventInterfaceType;
}
bool WheelEvent::isWheelEvent() const
{
return true;
}
} // namespace WebCore
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