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#include "tapandholdgesture.h"
#include <QtGui/qevent.h>
/*!
\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)
{
if (!event->spontaneous())
return false;
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;
default:
break;
}
return false;
}
/*! \internal */
void TapAndHoldGesture::timerEvent(QTimerEvent *event)
{
if (event->timerId() != timer.timerId())
return;
if (iteration == TapAndHoldGesture::iterationCount) {
timer.stop();
setState(Qt::GestureFinished);
emit triggered();
} else {
setState(Qt::GestureStarted);
emit triggered();
}
++iteration;
}
/*! \internal */
void TapAndHoldGesture::reset()
{
if (state() != Qt::NoGesture)
emit cancelled();
setState(Qt::NoGesture);
timer.stop();
iteration = 0;
}
/*!
\property TapAndHoldGesture::pos
\brief The position of the gesture.
*/
QPoint TapAndHoldGesture::pos() const
{
return position;
}
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