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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 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 "core/events/WheelEvent.h"
#include "core/clipboard/DataTransfer.h"
#include "platform/PlatformMouseEvent.h"
namespace blink {
namespace {
unsigned convertDeltaMode(const WebMouseWheelEvent& event) {
return event.scrollByPage ? WheelEvent::kDomDeltaPage
: WheelEvent::kDomDeltaPixel;
}
// Negate a long value without integer overflow.
long negateIfPossible(long value) {
if (value == LONG_MIN)
return value;
return -value;
}
} // namespace
WheelEvent* WheelEvent::create(const WebMouseWheelEvent& event,
AbstractView* view) {
return new WheelEvent(event, view);
}
WheelEvent::WheelEvent()
: m_deltaX(0), m_deltaY(0), m_deltaZ(0), m_deltaMode(kDomDeltaPixel) {}
WheelEvent::WheelEvent(const AtomicString& type,
const WheelEventInit& initializer)
: MouseEvent(type, initializer),
m_wheelDelta(initializer.wheelDeltaX() ? initializer.wheelDeltaX()
: -initializer.deltaX(),
initializer.wheelDeltaY() ? initializer.wheelDeltaY()
: -initializer.deltaY()),
m_deltaX(initializer.deltaX()
? initializer.deltaX()
: negateIfPossible(initializer.wheelDeltaX())),
m_deltaY(initializer.deltaY()
? initializer.deltaY()
: negateIfPossible(initializer.wheelDeltaY())),
m_deltaZ(initializer.deltaZ()),
m_deltaMode(initializer.deltaMode()) {}
WheelEvent::WheelEvent(const WebMouseWheelEvent& event, AbstractView* view)
: MouseEvent(EventTypeNames::wheel,
true,
event.isCancelable(),
view,
PlatformMouseEvent::RealOrIndistinguishable,
// TODO(zino): Should support canvas hit region because the
// wheel event is a kind of mouse event. Please see
// http://crbug.com/594075
String(),
event),
m_wheelDelta(event.wheelTicksX * TickMultiplier,
event.wheelTicksY * TickMultiplier),
m_deltaX(-event.deltaXInRootFrame()),
m_deltaY(-event.deltaYInRootFrame()),
m_deltaZ(0),
m_deltaMode(convertDeltaMode(event)),
m_nativeEvent(event) {}
const AtomicString& WheelEvent::interfaceName() const {
return EventNames::WheelEvent;
}
bool WheelEvent::isMouseEvent() const {
return false;
}
bool WheelEvent::isWheelEvent() const {
return true;
}
EventDispatchMediator* WheelEvent::createMediator() {
return EventDispatchMediator::create(this);
}
DEFINE_TRACE(WheelEvent) {
MouseEvent::trace(visitor);
}
} // namespace blink
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