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  • Committer: Bazaar Package Importer
  • Author(s): Alessandro Ghersi
  • Date: 2009-11-02 18:30:08 UTC
  • mfrom: (1.2.2 upstream)
  • mto: (15.2.5 experimental)
  • mto: This revision was merged to the branch mainline in revision 88.
  • Revision ID: james.westby@ubuntu.com-20091102183008-b6a4gcs128mvfb3m
Tags: upstream-4.6.0~beta1
Import upstream version 4.6.0~beta1

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src/gui/kernel/qwinnativepangesturerecognizer_win.cpp
 
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/****************************************************************************
 
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**
 
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 
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** All rights reserved.
 
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** Contact: Nokia Corporation (qt-info@nokia.com)
 
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**
 
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** This file is part of the QtGui module of the Qt Toolkit.
 
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**
 
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** $QT_BEGIN_LICENSE:LGPL$
 
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** No Commercial Usage
 
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** This file contains pre-release code and may not be distributed.
 
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** You may use this file in accordance with the terms and conditions
 
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** contained in the Technology Preview License Agreement accompanying
 
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** this package.
 
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**
 
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** GNU Lesser General Public License Usage
 
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** Alternatively, this file may be used under the terms of the GNU Lesser
 
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** General Public License version 2.1 as published by the Free Software
 
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** Foundation and appearing in the file LICENSE.LGPL included in the
 
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** packaging of this file.  Please review the following information to
 
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** ensure the GNU Lesser General Public License version 2.1 requirements
 
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 
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**
 
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** In addition, as a special exception, Nokia gives you certain additional
 
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** rights.  These rights are described in the Nokia Qt LGPL Exception
 
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 
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**
 
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** If you have questions regarding the use of this file, please contact
 
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** Nokia at qt-info@nokia.com.
 
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**
 
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**
 
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**
 
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**
 
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**
 
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**
 
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**
 
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**
 
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** $QT_END_LICENSE$
 
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**
 
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****************************************************************************/
 
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#include "private/qwinnativepangesturerecognizer_win_p.h"
 
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#include "qevent.h"
 
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#include "qgraphicsitem.h"
 
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#include "qgesture.h"
 
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#include "private/qgesture_p.h"
 
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#include "private/qevent_p.h"
 
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#include "private/qapplication_p.h"
 
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#include "private/qwidget_p.h"
 
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QT_BEGIN_NAMESPACE
 
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QWinNativePanGestureRecognizer::QWinNativePanGestureRecognizer()
 
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{
 
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}
 
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QGesture* QWinNativePanGestureRecognizer::createGesture(QObject *target) const
 
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{
 
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    if (!target)
 
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        return new QPanGesture; // a special case
 
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    if (qobject_cast<QGraphicsObject*>(target))
 
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        return 0;
 
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    if (!target->isWidgetType())
 
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        return 0;
 
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    QWidget *q = static_cast<QWidget*>(target);
 
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    QWidgetPrivate *d = q->d_func();
 
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    d->nativeGesturePanEnabled = true;
 
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    d->winSetupGestures();
 
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    return new QPanGesture;
 
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}
 
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QGestureRecognizer::Result QWinNativePanGestureRecognizer::filterEvent(QGesture *state, QObject *, QEvent *event)
 
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{
 
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    QPanGesture *q = static_cast<QPanGesture*>(state);
 
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    QPanGesturePrivate *d = q->d_func();
 
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    QGestureRecognizer::Result result = QGestureRecognizer::Ignore;
 
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    if (event->type() == QEvent::NativeGesture) {
 
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        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
 
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        switch(ev->gestureType) {
 
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        case QNativeGestureEvent::GestureBegin:
 
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            break;
 
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        case QNativeGestureEvent::Pan:
 
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            result = QGestureRecognizer::GestureTriggered;
 
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            event->accept();
 
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            break;
 
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        case QNativeGestureEvent::GestureEnd:
 
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            if (q->state() == Qt::NoGesture)
 
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                return QGestureRecognizer::Ignore; // some other gesture has ended
 
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            result = QGestureRecognizer::GestureFinished;
 
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            break;
 
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        default:
 
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            return QGestureRecognizer::Ignore;
 
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        }
 
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        if (q->state() == Qt::NoGesture) {
 
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            d->lastOffset = d->totalOffset = d->offset = QSize();
 
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        } else {
 
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            d->lastOffset = d->offset;
 
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            d->offset = QSize(ev->position.x() - d->lastPosition.x(),
 
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                              ev->position.y() - d->lastPosition.y());
 
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            d->totalOffset += d->offset;
 
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        }
 
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        d->lastPosition = ev->position;
 
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    }
 
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    return result;
 
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}
 
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void QWinNativePanGestureRecognizer::reset(QGesture *state)
 
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{
 
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    QPanGesture *pan = static_cast<QPanGesture*>(state);
 
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    QPanGesturePrivate *d = pan->d_func();
 
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    d->totalOffset = d->lastOffset = d->offset = QSizeF();
 
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    d->lastPosition = QPoint();
 
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    d->acceleration = 0;
 
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    QGestureRecognizer::reset(state);
 
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}
 
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QT_END_NAMESPACE