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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

2 files changed, 303 insertions, 0 deletions

diff --git a/examples/scroller/graphicsview/graphicsview.pro b/examples/scroller/graphicsview/graphicsview.pro
new file mode 100644
index 0000000000..b0b8405293
--- /dev/null
+++ b/examples/scroller/graphicsview/graphicsview.pro
@@ -0,0 +1,8 @@
+TEMPLATE = app
+SOURCES = main.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/qtbase/scroller/graphicsview
+sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS graphicsview.pro
+sources.path = $$[QT_INSTALL_EXAMPLES]/qtbase/scroller/graphicsview
+INSTALLS += target sources
diff --git a/examples/scroller/graphicsview/main.cpp b/examples/scroller/graphicsview/main.cpp
new file mode 100644
index 0000000000..738a824269
--- /dev/null
+++ b/examples/scroller/graphicsview/main.cpp
@@ -0,0 +1,295 @@
+/****************************************************************************
+**
+** 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 examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore>
+#include <QtGui>
+
+#define NUM_ITEMS 100
+#define NUM_LISTS 10
+
+/*!
+    \class RectObject
+    Note that it needs to be a QGraphicsObject or else the gestures will not work correctly.
+*/
+class RectObject : public QGraphicsObject
+{
+    Q_OBJECT
+
+public:
+
+    RectObject(const QString &text, qreal x, qreal y, qreal width, qreal height, QBrush brush, QGraphicsItem *parent = 0)
+        : QGraphicsObject(parent)
+        , m_text(text)
+        , m_rect(x, y, width, height)
+        , m_pen(brush.color().lighter(), 3.0)
+        , m_brush(brush)
+    {
+        setFlag(QGraphicsItem::ItemClipsToShape, true);
+    }
+
+    QRectF boundingRect() const
+    {
+        // here we only want the size of the children and not the size of the children of the children...
+        qreal halfpw = m_pen.widthF() / 2;
+        QRectF rect = m_rect;
+        if (halfpw > 0.0)
+            rect.adjust(-halfpw, -halfpw, halfpw, halfpw);
+
+        return rect;
+    }
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+    {
+        Q_UNUSED(option);
+        Q_UNUSED(widget);
+        painter->setPen(m_pen);
+        painter->setBrush(m_brush);
+        painter->drawRect(m_rect);
+
+        painter->setPen(Qt::black);
+        QFont f;
+        f.setPixelSize(m_rect.height());
+        painter->setFont(f);
+        painter->drawText(m_rect, Qt::AlignCenter, m_text);
+    }
+
+    QString m_text;
+    QRectF m_rect;
+    QPen m_pen;
+    QBrush m_brush;
+};
+
+class ViewObject : public QGraphicsObject
+{
+    Q_OBJECT
+public:
+    ViewObject(QGraphicsObject *parent)
+        : QGraphicsObject(parent)
+    { }
+
+    QRectF boundingRect() const
+    {
+        QRectF rect;
+        foreach (QGraphicsItem *item, childItems())
+            rect |= item->boundingRect().translated(item->pos());
+        return rect;
+    }
+
+    void paint(QPainter*, const QStyleOptionGraphicsItem*, QWidget*)
+    { }
+};
+
+class ListObject : public QGraphicsObject
+{
+    Q_OBJECT
+
+public:
+    ListObject(const QSizeF &size, bool useTouch)
+    {
+        m_size = size;
+        setFlag(QGraphicsItem::ItemClipsChildrenToShape, true);
+        // grab gesture via Touch or Mouse events
+        QScroller::grabGesture(this, useTouch ? QScroller::TouchGesture : QScroller::LeftMouseButtonGesture);
+
+        // this needs to be QGraphicsOBJECT - otherwise gesture recognition
+        // will not work for the parent of the viewport (in this case the
+        // list)
+        m_viewport = new ViewObject(this);
+
+    }
+
+    QGraphicsObject *viewport() const
+    {
+        return m_viewport;
+    }
+
+    bool event(QEvent *e)
+    {
+        switch (e->type()) {
+// ![2]
+        case QEvent::ScrollPrepare: {
+            QScrollPrepareEvent *se = static_cast<QScrollPrepareEvent *>(e);
+            se->setViewportSize(m_size);
+            QRectF br = m_viewport->boundingRect();
+            se->setContentPosRange(QRectF(0, 0,
+                                          qMax(qreal(0), br.width() - m_size.width()),
+                                          qMax(qreal(0), br.height() - m_size.height())));
+            se->setContentPos(-m_viewport->pos());
+            se->accept();
+            return true;
+        }
+// ![1]
+// ![2]
+        case QEvent::Scroll: {
+            QScrollEvent *se = static_cast<QScrollEvent *>(e);
+            m_viewport->setPos(-se->contentPos() - se->overshootDistance());
+            return true;
+        }
+// ![2]
+        default:
+            break;
+        }
+        return QGraphicsObject::event(e);
+    }
+
+    bool sceneEvent(QEvent *e)
+    {
+        switch (e->type()) {
+        case QEvent::TouchBegin: {
+            // We need to return true for the TouchBegin here in the
+            // top-most graphics object - otherwise gestures in our parent
+            // objects will NOT work at all (the accept() flag is already
+            // set due to our setAcceptTouchEvents(true) call in the c'tor
+            return true;
+
+        }
+        case QEvent::GraphicsSceneMousePress: {
+            // We need to return true for the MousePress here in the
+            // top-most graphics object - otherwise gestures in our parent
+            // objects will NOT work at all (the accept() flag is already
+            // set to true by Qt)
+            return true;
+
+        }
+        default:
+            break;
+        }
+        return QGraphicsObject::sceneEvent(e);
+    }
+
+    QRectF boundingRect() const
+    {
+        return QRectF(0, 0, m_size.width() + 3, m_size.height());
+    }
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+    {
+        Q_UNUSED(option);
+        Q_UNUSED(widget);
+        painter->setPen(QPen(QColor(100, 100, 100), 3.0));
+        painter->drawRect(QRect(1.5, 1.5, m_size.width() - 3, m_size.height() - 3));
+    }
+
+    QSizeF m_size;
+    ViewObject *m_viewport;
+};
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(bool useTouch)
+    {
+        m_scene = new QGraphicsScene();
+
+        // -- make the main list
+        ListObject *mainList = new ListObject(QSizeF(780, 400), useTouch);
+        mainList->setObjectName(QLatin1String("MainList"));
+        m_scene->addItem(mainList);
+// ![3]
+        for (int i=0; i<NUM_LISTS; i++) {
+            ListObject *childList = new ListObject(QSizeF(mainList->m_size.width()/3, mainList->m_size.height()), useTouch);
+            childList->setObjectName(QString("ChildList %1").arg(i));
+            fillList(childList);
+            childList->setParentItem(mainList->viewport());
+            childList->setPos(i*mainList->m_size.width()/3, 0);
+        }
+        mainList->viewport()->setPos(0, 0);
+
+
+        /*
+        list1->setTransformOriginPoint(200, 200);
+        list1->setRotation(135);
+        list1->setPos(20 + 200 * .41, 20 + 200 * .41);
+        */
+// ![3]
+
+        m_view = new QGraphicsView(m_scene);
+        setCentralWidget(m_view);
+        setWindowTitle(tr("Gesture example"));
+        m_scene->setSceneRect(0, 0, m_view->viewport()->width(), m_view->viewport()->height());
+    }
+
+    /**
+     *  Fills the list object \a list with RectObjects.
+     */
+    void fillList(ListObject *list)
+    {
+        qreal h = list->m_size.height() / 10;
+        for (int i=0; i<NUM_ITEMS; i++) {
+            QColor color =  QColor(255*i/NUM_ITEMS, 255*(NUM_ITEMS-i)/NUM_ITEMS, 127*(i%2)+64*(i/2%2));
+            QString text = QLatin1String("Item #") + QString::number(i);
+            QGraphicsItem *rect = new RectObject(text, 0, 0, list->m_size.width() - 6, h - 3, QBrush(color), list->viewport());
+            rect->setPos(3, h*i+3);
+        }
+        list->viewport()->setPos(0, 0);
+    }
+
+
+protected:
+    void resizeEvent(QResizeEvent *e)
+    {
+        // resize the scene according to our own size to prevent scrolling
+        m_scene->setSceneRect(0, 0, m_view->viewport()->width(), m_view->viewport()->height());
+        QMainWindow::resizeEvent(e);
+    }
+
+    QGraphicsScene *m_scene;
+    QGraphicsView *m_view;
+};
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    bool touch = (a.arguments().contains(QLatin1String("--touch")));
+    MainWindow mw(touch);
+#ifdef Q_WS_S60
+    mw.showMaximized();
+#else
+    mw.show();
+#endif
+#ifdef Q_WS_MAC
+    mw.raise();
+#endif
+    return a.exec();
+}
+
+#include "main.moc"