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/*
* Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies)
*
* 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. 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
* 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.
*/
#include "config.h"
#include "QtTapGestureRecognizer.h"
#include "QtWebPageEventHandler.h"
#include <QLineF>
#include <QTouchEvent>
namespace WebKit {
QtTapGestureRecognizer::QtTapGestureRecognizer(QtWebPageEventHandler* eventHandler)
: QtGestureRecognizer(eventHandler)
, m_tapState(NoTap)
{
reset();
}
bool QtTapGestureRecognizer::recognize(const QTouchEvent* event, qint64 eventTimestampMillis)
{
if (event->touchPoints().size() != 1) {
reset();
return false;
}
switch (event->type()) {
case QEvent::TouchBegin:
ASSERT(m_tapState == NoTap);
ASSERT(!m_tapAndHoldTimer.isActive());
m_tapAndHoldTimer.start(tapAndHoldTime, this);
if (m_doubleTapTimer.isActive()) {
// Might be double tap.
ASSERT(m_touchBeginEventForTap);
m_doubleTapTimer.stop();
QPointF lastPosition = m_touchBeginEventForTap->touchPoints().first().screenPos();
QPointF newPosition = event->touchPoints().first().screenPos();
if (QLineF(lastPosition, newPosition).length() < maxDoubleTapDistance)
m_tapState = DoubleTapCandidate;
else {
// Received a new tap, that is unrelated to the previous one.
tapTimeout();
m_tapState = SingleTapStarted;
}
} else
m_tapState = SingleTapStarted;
m_touchBeginEventForTap = adoptPtr(new QTouchEvent(*event));
break;
case QEvent::TouchUpdate:
// If the touch point moves further than the threshold, we cancel the tap gesture.
if (m_tapState == SingleTapStarted) {
const QTouchEvent::TouchPoint& touchPoint = event->touchPoints().first();
QPointF offset(touchPoint.scenePos() - m_touchBeginEventForTap->touchPoints().first().scenePos());
const qreal distX = qAbs(offset.x());
const qreal distY = qAbs(offset.y());
if (distX > initialTriggerDistanceThreshold || distY > initialTriggerDistanceThreshold)
reset();
}
break;
case QEvent::TouchEnd:
m_tapAndHoldTimer.stop();
switch (m_tapState) {
case DoubleTapCandidate:
{
ASSERT(!m_doubleTapTimer.isActive());
m_tapState = NoTap;
const QTouchEvent::TouchPoint& touchPoint = event->touchPoints().first();
QPointF startPosition = touchPoint.startScreenPos();
QPointF endPosition = touchPoint.screenPos();
if (QLineF(endPosition, startPosition).length() < maxDoubleTapDistance && m_eventHandler)
m_eventHandler->handleDoubleTapEvent(touchPoint);
break;
}
case SingleTapStarted:
ASSERT(!m_doubleTapTimer.isActive());
m_doubleTapTimer.start(doubleClickInterval, this);
m_tapState = NoTap;
break;
case TapAndHold:
m_tapState = NoTap;
break;
default:
break;
}
break;
default:
break;
}
return false;
}
void QtTapGestureRecognizer::tapTimeout()
{
m_doubleTapTimer.stop();
m_eventHandler->handleSingleTapEvent(m_touchBeginEventForTap->touchPoints().at(0));
m_touchBeginEventForTap.clear();
}
void QtTapGestureRecognizer::tapAndHoldTimeout()
{
ASSERT(m_touchBeginEventForTap);
m_tapAndHoldTimer.stop();
#if 0 // No support for synthetic context menus in WK2 yet.
QTouchEvent::TouchPoint tapPoint = m_touchBeginEventForTap->touchPoints().at(0);
WebGestureEvent gesture(WebEvent::GestureTapAndHold, tapPoint.pos().toPoint(), tapPoint.screenPos().toPoint(), WebEvent::Modifiers(0), 0);
if (m_webPageProxy)
m_webPageProxy->handleGestureEvent(gesture);
#endif
m_touchBeginEventForTap.clear();
m_tapState = TapAndHold;
ASSERT(!m_doubleTapTimer.isActive());
m_doubleTapTimer.stop();
}
void QtTapGestureRecognizer::reset()
{
m_tapState = NoTap;
m_touchBeginEventForTap.clear();
m_tapAndHoldTimer.stop();
QtGestureRecognizer::reset();
}
void QtTapGestureRecognizer::timerEvent(QTimerEvent* ev)
{
int timerId = ev->timerId();
if (timerId == m_doubleTapTimer.timerId())
tapTimeout();
else if (timerId == m_tapAndHoldTimer.timerId())
tapAndHoldTimeout();
else
QObject::timerEvent(ev);
}
} // namespace WebKit
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