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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite 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 <QtGui>
+
+#include "mousepangesturerecognizer.h"
+
+class ScrollArea : public QScrollArea
+{
+ Q_OBJECT
+public:
+ ScrollArea(QWidget *parent = 0)
+ : QScrollArea(parent), outside(false)
+ {
+ viewport()->grabGesture(Qt::PanGesture, Qt::ReceivePartialGestures);
+ }
+
+protected:
+ bool viewportEvent(QEvent *event)
+ {
+ if (event->type() == QEvent::Gesture) {
+ gestureEvent(static_cast<QGestureEvent *>(event));
+ return true;
+ } else if (event->type() == QEvent::GestureOverride) {
+ QGestureEvent *ge = static_cast<QGestureEvent *>(event);
+ if (QPanGesture *pan = static_cast<QPanGesture *>(ge->gesture(Qt::PanGesture)))
+ if (pan->state() == Qt::GestureStarted) {
+ outside = false;
+ }
+ }
+ return QScrollArea::viewportEvent(event);
+ }
+ void gestureEvent(QGestureEvent *event)
+ {
+ QPanGesture *pan = static_cast<QPanGesture *>(event->gesture(Qt::PanGesture));
+ if (pan) {
+ switch(pan->state()) {
+ case Qt::GestureStarted: qDebug() << this << "Pan: started"; break;
+ case Qt::GestureFinished: qDebug() << this << "Pan: finished"; break;
+ case Qt::GestureCanceled: qDebug() << this << "Pan: canceled"; break;
+ case Qt::GestureUpdated: break;
+ default: qDebug() << this << "Pan: <unknown state>"; break;
+ }
+
+ if (pan->state() == Qt::GestureStarted)
+ outside = false;
+ event->ignore();
+ event->ignore(pan);
+ if (outside)
+ return;
+
+ const QPointF delta = pan->delta();
+ const QPointF totalOffset = pan->offset();
+ QScrollBar *vbar = verticalScrollBar();
+ QScrollBar *hbar = horizontalScrollBar();
+
+ if ((vbar->value() == vbar->minimum() && totalOffset.y() > 10) ||
+ (vbar->value() == vbar->maximum() && totalOffset.y() < -10)) {
+ outside = true;
+ return;
+ }
+ if ((hbar->value() == hbar->minimum() && totalOffset.x() > 10) ||
+ (hbar->value() == hbar->maximum() && totalOffset.x() < -10)) {
+ outside = true;
+ return;
+ }
+ vbar->setValue(vbar->value() - delta.y());
+ hbar->setValue(hbar->value() - delta.x());
+ event->accept(pan);
+ }
+ }
+
+private:
+ bool outside;
+};
+
+class Slider : public QSlider
+{
+public:
+ Slider(Qt::Orientation orientation, QWidget *parent = 0)
+ : QSlider(orientation, parent)
+ {
+ grabGesture(Qt::PanGesture);
+ }
+protected:
+ bool event(QEvent *event)
+ {
+ if (event->type() == QEvent::Gesture) {
+ gestureEvent(static_cast<QGestureEvent *>(event));
+ return true;
+ }
+ return QSlider::event(event);
+ }
+ void gestureEvent(QGestureEvent *event)
+ {
+ QPanGesture *pan = static_cast<QPanGesture *>(event->gesture(Qt::PanGesture));
+ if (pan) {
+ switch (pan->state()) {
+ case Qt::GestureStarted: qDebug() << this << "Pan: started"; break;
+ case Qt::GestureFinished: qDebug() << this << "Pan: finished"; break;
+ case Qt::GestureCanceled: qDebug() << this << "Pan: canceled"; break;
+ case Qt::GestureUpdated: break;
+ default: qDebug() << this << "Pan: <unknown state>"; break;
+ }
+
+ if (pan->state() == Qt::GestureStarted)
+ outside = false;
+ event->ignore();
+ event->ignore(pan);
+ if (outside)
+ return;
+ const QPointF delta = pan->delta();
+ const QPointF totalOffset = pan->offset();
+ if (orientation() == Qt::Horizontal) {
+ if ((value() == minimum() && totalOffset.x() < -10) ||
+ (value() == maximum() && totalOffset.x() > 10)) {
+ outside = true;
+ return;
+ }
+ if (totalOffset.y() < 40 && totalOffset.y() > -40) {
+ setValue(value() + delta.x());
+ event->accept(pan);
+ } else {
+ outside = true;
+ }
+ } else if (orientation() == Qt::Vertical) {
+ if ((value() == maximum() && totalOffset.y() < -10) ||
+ (value() == minimum() && totalOffset.y() > 10)) {
+ outside = true;
+ return;
+ }
+ if (totalOffset.x() < 40 && totalOffset.x() > -40) {
+ setValue(value() - delta.y());
+ event->accept(pan);
+ } else {
+ outside = true;
+ }
+ }
+ }
+ }
+private:
+ bool outside;
+};
+
+class MainWindow : public QMainWindow
+{
+public:
+ MainWindow()
+ {
+ rootScrollArea = new ScrollArea;
+ rootScrollArea->setObjectName(QLatin1String("rootScrollArea"));
+ setCentralWidget(rootScrollArea);
+
+ QWidget *root = new QWidget;
+ root->setFixedSize(3000, 3000);
+ rootScrollArea->setWidget(root);
+
+ Slider *verticalSlider = new Slider(Qt::Vertical, root);
+ verticalSlider->setObjectName(QLatin1String("verticalSlider"));
+ verticalSlider ->move(650, 1100);
+ Slider *horizontalSlider = new Slider(Qt::Horizontal, root);
+ horizontalSlider->setObjectName(QLatin1String("horizontalSlider"));
+ horizontalSlider ->move(600, 1000);
+
+ childScrollArea = new ScrollArea(root);
+ childScrollArea->setObjectName(QLatin1String("childScrollArea"));
+ childScrollArea->move(500, 500);
+ QWidget *w = new QWidget;
+ w->setMinimumWidth(700);
+ QVBoxLayout *l = new QVBoxLayout(w);
+ l->setMargin(20);
+ for (int i = 0; i < 100; ++i) {
+ QWidget *w = new QWidget;
+ QHBoxLayout *ll = new QHBoxLayout(w);
+ ll->addWidget(new QLabel(QString("Label %1").arg(i)));
+ ll->addWidget(new QPushButton(QString("Button %1").arg(i)));
+ l->addWidget(w);
+ }
+ childScrollArea->setWidget(w);
+#if defined(Q_OS_WIN)
+ // Windows can force Qt to create a native window handle for an
+ // intermediate widget and that will block gesture to get touch events.
+ // So this hack to make sure gestures get all touch events they need.
+ foreach (QObject *w, children())
+ if (w->isWidgetType())
+ static_cast<QWidget *>(w)->setAttribute(Qt::WA_AcceptTouchEvents);
+#endif
+ }
+private:
+ ScrollArea *rootScrollArea;
+ ScrollArea *childScrollArea;
+};
+
+int main(int argc, char **argv)
+{
+ QApplication app(argc, argv);
+ QGestureRecognizer::registerRecognizer(new MousePanGestureRecognizer);
+ MainWindow w;
+ w.show();
+ return app.exec();
+}
+
+#include "main.moc"
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