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 **

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    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

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

    41 

    42 #include <QtGui>

    43 

    44 #include "mousepangesturerecognizer.h"

    45 

    46 class ScrollArea : public QScrollArea

    47 {

    48     Q_OBJECT

    49 public:

    50     ScrollArea(QWidget *parent = 0)

    51         : QScrollArea(parent), outside(false)

    52     {

    53         viewport()->grabGesture(Qt::PanGesture);

    54     }

    55 

    56 protected:

    57     bool viewportEvent(QEvent *event)

    58     {

    59         if (event->type() == QEvent::Gesture) {

    60             gestureEvent(static_cast<QGestureEvent *>(event));

    61             return true;

    62         } else if (event->type() == QEvent::GestureOverride) {

    63             QGestureEvent *ge = static_cast<QGestureEvent *>(event);

    64             if (QPanGesture *pan = static_cast<QPanGesture *>(ge->gesture(Qt::PanGesture)))

    65                 if (pan->state() == Qt::GestureStarted) {

    66                     outside = false;

    67                 }

    68         }

    69         return QScrollArea::viewportEvent(event);

    70     }

    71     void gestureEvent(QGestureEvent *event)

    72     {

    73         QPanGesture *pan = static_cast<QPanGesture *>(event->gesture(Qt::PanGesture));

    74         if (pan) {

    75             switch(pan->state()) {

    76             case Qt::GestureStarted: qDebug("area: Pan: started"); break;

    77             case Qt::GestureFinished: qDebug("area: Pan: finished"); break;

    78             case Qt::GestureCanceled: qDebug("area: Pan: canceled"); break;

    79             case Qt::GestureUpdated: break;

    80             default: qDebug("area: Pan: <unknown state>"); break;

    81             }

    82 

    83             if (pan->state() == Qt::GestureStarted)

    84                 outside = false;

    85             event->ignore();

    86             event->ignore(pan);

    87             if (outside)

    88                 return;

    89 

    90             const QPointF offset = pan->offset();

    91             const QPointF totalOffset = pan->totalOffset();

    92             QScrollBar *vbar = verticalScrollBar();

    93             QScrollBar *hbar = horizontalScrollBar();

    94 

    95             if ((vbar->value() == vbar->minimum() && totalOffset.y() > 10) ||

    96                 (vbar->value() == vbar->maximum() && totalOffset.y() < -10)) {

    97                 outside = true;

    98                 return;

    99             }

   100             if ((hbar->value() == hbar->minimum() && totalOffset.x() > 10) ||

   101                 (hbar->value() == hbar->maximum() && totalOffset.x() < -10)) {

   102                 outside = true;

   103                 return;

   104             }

   105             vbar->setValue(vbar->value() - offset.y());

   106             hbar->setValue(hbar->value() - offset.x());

   107             event->accept(pan);

   108         }

   109     }

   110 

   111 private:

   112     bool outside;

   113 };

   114 

   115 class Slider : public QSlider

   116 {

   117 public:

   118     Slider(Qt::Orientation orientation, QWidget *parent = 0)

   119         : QSlider(orientation, parent)

   120     {

   121         grabGesture(Qt::PanGesture);

   122     }

   123 protected:

   124     bool event(QEvent *event)

   125     {

   126         if (event->type() == QEvent::Gesture) {

   127             gestureEvent(static_cast<QGestureEvent *>(event));

   128             return true;

   129         }

   130         return QSlider::event(event);

   131     }

   132     void gestureEvent(QGestureEvent *event)

   133     {

   134         QPanGesture *pan = static_cast<QPanGesture *>(event->gesture(Qt::PanGesture));

   135         if (pan) {

   136             switch (pan->state()) {

   137             case Qt::GestureStarted: qDebug("slider: Pan: started"); break;

   138             case Qt::GestureFinished: qDebug("slider: Pan: finished"); break;

   139             case Qt::GestureCanceled: qDebug("slider: Pan: canceled"); break;

   140             case Qt::GestureUpdated: break;

   141             default: qDebug("slider: Pan: <unknown state>"); break;

   142             }

   143 

   144             if (pan->state() == Qt::GestureStarted)

   145                 outside = false;

   146             event->ignore();

   147             event->ignore(pan);

   148             if (outside)

   149                 return;

   150             const QPointF offset = pan->offset();

   151             const QPointF totalOffset = pan->totalOffset();

   152             if (orientation() == Qt::Horizontal) {

   153                 if ((value() == minimum() && totalOffset.x() < -10) ||

   154                     (value() == maximum() && totalOffset.x() > 10)) {

   155                     outside = true;

   156                     return;

   157                 }

   158                 if (totalOffset.y() < 40 && totalOffset.y() > -40) {

   159                     setValue(value() + offset.x());

   160                     event->accept(pan);

   161                 } else {

   162                     outside = true;

   163                 }

   164             } else if (orientation() == Qt::Vertical) {

   165                 if ((value() == maximum() && totalOffset.y() < -10) ||

   166                     (value() == minimum() && totalOffset.y() > 10)) {

   167                     outside = true;

   168                     return;

   169                 }

   170                 if (totalOffset.x() < 40 && totalOffset.x() > -40) {

   171                     setValue(value() - offset.y());

   172                     event->accept(pan);

   173                 } else {

   174                     outside = true;

   175                 }

   176             }

   177         }

   178     }

   179 private:

   180     bool outside;

   181 };

   182 

   183 class MainWindow : public QMainWindow

   184 {

   185 public:

   186     MainWindow()

   187     {

   188         rootScrollArea = new ScrollArea;

   189         setCentralWidget(rootScrollArea);

   190 

   191         QWidget *root = new QWidget;

   192         root->setFixedSize(3000, 3000);

   193         rootScrollArea->setWidget(root);

   194 

   195         Slider *verticalSlider = new Slider(Qt::Vertical, root);

   196         verticalSlider ->move(650, 1100);

   197         Slider *horizontalSlider = new Slider(Qt::Horizontal, root);

   198         horizontalSlider ->move(600, 1000);

   199 

   200         childScrollArea = new ScrollArea(root);

   201         childScrollArea->move(500, 500);

   202         QWidget *w = new QWidget;

   203         w->setMinimumWidth(400);

   204         QVBoxLayout *l = new QVBoxLayout(w);

   205         l->setMargin(20);

   206         for (int i = 0; i < 100; ++i) {

   207             QWidget *w = new QWidget;

   208             QHBoxLayout *ll = new QHBoxLayout(w);

   209             ll->addWidget(new QLabel(QString("Label %1").arg(i)));

   210             ll->addWidget(new QPushButton(QString("Button %1").arg(i)));

   211             l->addWidget(w);

   212         }

   213         childScrollArea->setWidget(w);

   214     }

   215 private:

   216     ScrollArea *rootScrollArea;

   217     ScrollArea *childScrollArea;

   218 };

   219 

   220 int main(int argc, char **argv)

   221 {

   222     QApplication app(argc, argv);

   223     app.registerGestureRecognizer(new MousePanGestureRecognizer);

   224     MainWindow w;

   225     w.show();

   226     return app.exec();

   227 }

   228 

   229 #include "main.moc"