1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the test suite of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

    33 **

    34 **

    35 **

    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include "mousepangesturerecognizer.h"

    43 

    44 #include <QEvent>

    45 #include <QVariant>

    46 #include <QGraphicsSceneMouseEvent>

    47 #include <QMouseEvent>

    48 #include <QGesture>

    49 

    50 MousePanGestureRecognizer::MousePanGestureRecognizer()

    51 {

    52 }

    53 

    54 QGesture* MousePanGestureRecognizer::createGesture(QObject *)

    55 {

    56     return new QPanGesture;

    57 }

    58 

    59 QGestureRecognizer::Result MousePanGestureRecognizer::filterEvent(QGesture *state, QObject *, QEvent *event)

    60 {

    61     QPanGesture *g = static_cast<QPanGesture *>(state);

    62     QPoint globalPos;

    63     switch (event->type()) {

    64     case QEvent::GraphicsSceneMousePress:

    65     case QEvent::GraphicsSceneMouseDoubleClick:

    66     case QEvent::GraphicsSceneMouseMove:

    67     case QEvent::GraphicsSceneMouseRelease:

    68         globalPos = static_cast<QGraphicsSceneMouseEvent *>(event)->screenPos();

    69         break;

    70     case QEvent::MouseButtonPress:

    71     case QEvent::MouseMove:

    72     case QEvent::MouseButtonRelease:

    73         globalPos = static_cast<QMouseEvent *>(event)->globalPos();

    74         break;

    75     default:

    76         break;

    77     }

    78     if (event->type() == QEvent::MouseButtonPress || event->type() == QEvent::MouseButtonDblClick

    79         || event->type() == QEvent::GraphicsSceneMousePress || event->type() == QEvent::GraphicsSceneMouseDoubleClick) {

    80         g->setHotSpot(globalPos);

    81         g->setProperty("lastPos", globalPos);

    82         g->setProperty("pressed", QVariant::fromValue<bool>(true));

    83         return QGestureRecognizer::GestureTriggered | QGestureRecognizer::ConsumeEventHint;

    84     } else if (event->type() == QEvent::MouseMove || event->type() == QEvent::GraphicsSceneMouseMove) {

    85         if (g->property("pressed").toBool()) {

    86             QPoint pos = globalPos;

    87             QPoint lastPos = g->property("lastPos").toPoint();

    88             g->setLastOffset(g->offset());

    89             lastPos = pos - lastPos;

    90             g->setOffset(QPointF(lastPos.x(), lastPos.y()));

    91             g->setTotalOffset(g->totalOffset() + QPointF(lastPos.x(), lastPos.y()));

    92             g->setProperty("lastPos", pos);

    93             return QGestureRecognizer::GestureTriggered | QGestureRecognizer::ConsumeEventHint;

    94         }

    95         return QGestureRecognizer::NotGesture;

    96     } else if (event->type() == QEvent::MouseButtonRelease || event->type() == QEvent::GraphicsSceneMouseRelease) {

    97         return QGestureRecognizer::GestureFinished | QGestureRecognizer::ConsumeEventHint;

    98     }

    99     return QGestureRecognizer::Ignore;

   100 }

   101 

   102 void MousePanGestureRecognizer::reset(QGesture *state)

   103 {

   104     QPanGesture *g = static_cast<QPanGesture *>(state);

   105     g->setTotalOffset(QPointF());

   106     g->setLastOffset(QPointF());

   107     g->setOffset(QPointF());

   108     g->setAcceleration(0);

   109     g->setProperty("lastPos", QVariant());

   110     g->setProperty("pressed", QVariant::fromValue<bool>(false));

   111     QGestureRecognizer::reset(state);

   112 }