1 files changed, 150 insertions, 0 deletions
diff --git a/examples/gestures/graphicsview/main.cpp b/examples/gestures/graphicsview/main.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the $MODULE$ of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial Usage
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+class PannableGraphicsView : public QGraphicsView
+{
+public:
+    PannableGraphicsView()
+    {
+        grabGesture(Qt::PanGesture);
+    }
+protected:
+    bool event(QEvent *event)
+    {
+        if (event->type() == QEvent::Gesture) {
+            QGestureEvent *gestureEvent = static_cast<QGestureEvent*>(event);
+            if (const QGesture *g = gestureEvent->gesture(Qt::PanGesture)) {
+                QPoint pt = g->pos() - g->lastPos();
+                horizontalScrollBar()->setValue(horizontalScrollBar()->value() - pt.x());
+                verticalScrollBar()->setValue(verticalScrollBar()->value() - pt.y());
+                event->accept();
+                return true;
+            }
+        }
+        return QGraphicsView::event(event);
+    }
+};
+
+class ImageItem : public QGraphicsItem
+{
+public:
+    ImageItem()
+        : colored(false)
+    {
+        grabGesture(Qt::DoubleTapGesture);
+    }
+
+    QRectF boundingRect() const
+    {
+        return pixmap.isNull() ? QRectF(0, 0, 100, 100)
+            : QRectF(QPointF(0,0), QSizeF(pixmap.size()));
+    }
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem*, QWidget*)
+    {
+        if (pixmap.isNull()) {
+            painter->setBrush(QBrush( colored ? Qt::green : Qt::white));
+            painter->drawRect(0, 0, 100, 100);
+            painter->drawLine(0, 0, 100, 100);
+            painter->drawLine(0, 100, 100, 0);
+            return;
+        }
+        painter->drawPixmap(0, 0, pixmap);
+    }
+
+    bool sceneEvent(QEvent *event)
+    {
+        if (event->type() == QEvent::GraphicsSceneGesture) {
+            QGraphicsSceneGestureEvent *gestureEvent = static_cast<QGraphicsSceneGestureEvent*>(event);
+            if (gestureEvent->gesture(Qt::DoubleTapGesture)) {
+                event->accept();
+                colored = !colored;
+                update();
+                return true;
+            } else {
+                qWarning("Item received unknown gesture");
+            }
+        }
+        return QGraphicsItem::sceneEvent(event);
+    }
+
+private:
+    QPixmap pixmap;
+    bool colored;
+};
+
+class MainWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    MainWidget(QWidget *parent = 0)
+        : QWidget(parent)
+    {
+        QVBoxLayout *l = new QVBoxLayout(this);
+        view = new PannableGraphicsView;
+        l->addWidget(view);
+        scene = new QGraphicsScene(0, 0, 1024, 768, view);
+        view->setScene(scene);
+
+        ImageItem *item = new ImageItem;
+        scene->addItem(item);
+        item->setPos(scene->width()/3, scene->height()/3);
+    }
+
+signals:
+public slots:
+private:
+    QGraphicsView *view;
+    QGraphicsScene *scene;
+};
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    MainWidget w;
+    w.show();
+    return app.exec();
+}
+
+#include "main.moc"