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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qstandardgestures_p.h"
#include "qgesture.h"
#include "qgesture_p.h"
#include "qevent.h"
#include "qwidget.h"
QT_BEGIN_NAMESPACE
QPanGestureRecognizer::QPanGestureRecognizer()
{
}
QGesture *QPanGestureRecognizer::createGesture(QObject *target)
{
if (target && target->isWidgetType()) {
static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);
}
return new QPanGesture;
}
QGestureRecognizer::Result QPanGestureRecognizer::filterEvent(QGesture *state, QObject *, QEvent *event)
{
QPanGesture *q = static_cast<QPanGesture*>(state);
QPanGesturePrivate *d = q->d_func();
const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
QGestureRecognizer::Result result;
switch (event->type()) {
case QEvent::TouchBegin: {
result = QGestureRecognizer::MaybeGesture;
QTouchEvent::TouchPoint p = ev->touchPoints().at(0);
d->lastPosition = p.pos().toPoint();
d->lastOffset = d->totalOffset = d->offset = QPointF();
break;
}
case QEvent::TouchEnd: {
if (q->state() != Qt::NoGesture) {
if (ev->touchPoints().size() == 2) {
QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);
QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);
d->lastOffset = d->offset;
d->offset =
QPointF(p1.pos().x() - p1.lastPos().x() + p2.pos().x() - p2.lastPos().x(),
p1.pos().y() - p1.lastPos().y() + p2.pos().y() - p2.lastPos().y()) / 2;
d->totalOffset += d->offset;
}
result = QGestureRecognizer::GestureFinished;
} else {
result = QGestureRecognizer::NotGesture;
}
break;
}
case QEvent::TouchUpdate: {
if (ev->touchPoints().size() >= 2) {
QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);
QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);
d->lastOffset = d->offset;
d->offset =
QPointF(p1.pos().x() - p1.lastPos().x() + p2.pos().x() - p2.lastPos().x(),
p1.pos().y() - p1.lastPos().y() + p2.pos().y() - p2.lastPos().y()) / 2;
d->totalOffset += d->offset;
if (d->totalOffset.x() > 10 || d->totalOffset.y() > 10 ||
d->totalOffset.x() < -10 || d->totalOffset.y() < -10) {
result = QGestureRecognizer::GestureTriggered;
} else {
result = QGestureRecognizer::MaybeGesture;
}
}
break;
}
case QEvent::MouseButtonPress:
case QEvent::MouseMove:
case QEvent::MouseButtonRelease:
result = QGestureRecognizer::Ignore;
break;
default:
result = QGestureRecognizer::Ignore;
break;
}
return result;
}
void QPanGestureRecognizer::reset(QGesture *state)
{
QPanGesture *pan = static_cast<QPanGesture*>(state);
QPanGesturePrivate *d = pan->d_func();
d->totalOffset = d->lastOffset = d->offset = QPointF();
d->lastPosition = QPoint();
d->acceleration = 0;
//#if defined(QT_MAC_USE_COCOA)
// d->singleTouchPanTimer.stop();
// d->prevMousePos = QPointF(0, 0);
//#endif
QGestureRecognizer::reset(state);
}
/*
bool QPanGestureRecognizer::event(QEvent *event)
{
#if defined(QT_MAC_USE_COCOA)
Q_D(QPanGesture);
if (event->type() == QEvent::Timer) {
const QTimerEvent *te = static_cast<QTimerEvent *>(event);
if (te->timerId() == d->singleTouchPanTimer.timerId()) {
d->singleTouchPanTimer.stop();
updateState(Qt::GestureStarted);
}
}
#endif
bool consume = false;
#if defined(Q_WS_WIN)
#elif defined(QT_MAC_USE_COCOA)
// The following implements single touch
// panning on Mac:
const int panBeginDelay = 300;
const int panBeginRadius = 3;
const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
switch (event->type()) {
case QEvent::TouchBegin: {
if (ev->touchPoints().size() == 1) {
d->delayManager->setEnabled(true);
consume = d->delayManager->append(d->gestureTarget, *event);
d->lastPosition = QCursor::pos();
d->singleTouchPanTimer.start(panBeginDelay, this);
}
break;}
case QEvent::TouchEnd: {
d->delayManager->setEnabled(false);
if (state() != Qt::NoGesture) {
updateState(Qt::GestureFinished);
consume = true;
d->delayManager->clear();
} else {
d->delayManager->replay();
}
reset();
break;}
case QEvent::TouchUpdate: {
consume = d->delayManager->append(d->gestureTarget, *event);
if (ev->touchPoints().size() == 1) {
if (state() == Qt::NoGesture) {
// INVARIANT: The singleTouchTimer has still not fired.
// Lets check if the user moved his finger so much from
// the starting point that it makes sense to cancel:
const QPointF startPos = ev->touchPoints().at(0).startPos().toPoint();
const QPointF p = ev->touchPoints().at(0).pos().toPoint();
if ((startPos - p).manhattanLength() > panBeginRadius) {
d->delayManager->replay();
consume = false;
reset();
} else {
d->lastPosition = QCursor::pos();
}
} else {
d->delayManager->clear();
QPointF mousePos = QCursor::pos();
QPointF dist = mousePos - d->lastPosition;
d->lastPosition = mousePos;
d->lastOffset = d->offset;
d->offset = QSizeF(dist.x(), dist.y());
d->totalOffset += d->offset;
updateState(Qt::GestureUpdated);
}
} else if (state() == Qt::NoGesture) {
d->delayManager->replay();
consume = false;
reset();
}
break;}
case QEvent::MouseButtonPress:
case QEvent::MouseMove:
case QEvent::MouseButtonRelease:
if (d->delayManager->isEnabled())
consume = d->delayManager->append(d->gestureTarget, *event);
break;
default:
return false;
}
#else
Q_UNUSED(event);
#endif
return QGestureRecognizer::Ignore;
}
*/
QT_END_NAMESPACE
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