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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "tapandholdgesture.h"
#include <QtGui/qevent.h>
// #define TAPANDHOLD_USING_MOUSE
/*!
\class TapAndHoldGesture
\since 4.6
\brief The TapAndHoldGesture class represents a Tap-and-Hold gesture,
providing additional information.
*/
const int TapAndHoldGesture::iterationCount = 40;
const int TapAndHoldGesture::iterationTimeout = 50;
/*!
Creates a new Tap and Hold gesture handler object and marks it as a child
of \a parent.
On some platforms like Windows there is a system-wide tap and hold gesture
that cannot be overriden, hence the gesture might never trigger and default
context menu will be shown instead.
*/
TapAndHoldGesture::TapAndHoldGesture(QWidget *parent)
: QGesture(parent), iteration(0)
{
}
/*! \internal */
bool TapAndHoldGesture::filterEvent(QEvent *event)
{
const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
switch (event->type()) {
case QEvent::TouchBegin: {
if (timer.isActive())
timer.stop();
timer.start(TapAndHoldGesture::iterationTimeout, this);
const QPoint p = ev->touchPoints().at(0).pos().toPoint();
position = p;
break;
}
case QEvent::TouchUpdate:
if (ev->touchPoints().size() == 1) {
const QPoint startPos = ev->touchPoints().at(0).startPos().toPoint();
const QPoint pos = ev->touchPoints().at(0).pos().toPoint();
if ((startPos - pos).manhattanLength() > 15)
reset();
} else {
reset();
}
break;
case QEvent::TouchEnd:
reset();
break;
#ifdef TAPANDHOLD_USING_MOUSE
case QEvent::MouseButtonPress: {
if (timer.isActive())
timer.stop();
timer.start(TapAndHoldGesture::iterationTimeout, this);
const QPoint p = static_cast<QMouseEvent*>(event)->pos();
position = startPosition = p;
break;
}
case QEvent::MouseMove: {
const QPoint startPos = startPosition;
const QPoint pos = static_cast<QMouseEvent*>(event)->pos();
if ((startPos - pos).manhattanLength() > 15)
reset();
break;
}
case QEvent::MouseButtonRelease:
reset();
break;
#endif // TAPANDHOLD_USING_MOUSE
default:
break;
}
return false;
}
/*! \internal */
void TapAndHoldGesture::timerEvent(QTimerEvent *event)
{
if (event->timerId() != timer.timerId())
return;
if (iteration == TapAndHoldGesture::iterationCount) {
timer.stop();
updateState(Qt::GestureFinished);
} else {
updateState(Qt::GestureUpdated);
}
++iteration;
}
/*! \internal */
void TapAndHoldGesture::reset()
{
timer.stop();
iteration = 0;
position = startPosition = QPoint();
updateState(Qt::NoGesture);
}
/*!
\property TapAndHoldGesture::pos
\brief The position of the gesture.
*/
QPoint TapAndHoldGesture::pos() const
{
return position;
}
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