/****************************************************************************+
−
**+
−
** 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);+
−
}+
−
+
−
/*! \internal */+
−
/*+
−
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+
−