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#include <QtGui>

#include "valgrind/callgrind.h"

class ItemMover : public QObject

{

    Q_OBJECT

public:

    ItemMover(QGraphicsItem *item)

        : _item(item)

    {

        startTimer(0);

    }

protected:

    void timerEvent(QTimerEvent *event)

    {

        _item->moveBy(-1, 0);

    }

private:

    QGraphicsItem *_item;

};

class ClipItem : public QGraphicsRectItem

{

public:

    ClipItem(qreal x, qreal y, qreal w, qreal h, const QPen &pen, const QBrush &brush)

        : QGraphicsRectItem(x, y, w, h)

    {

        setPen(pen);

        setBrush(brush);

    }

    QPainterPath shape() const

    {

        QPainterPath path;

        path.addRect(rect());

        return path;

    }

};

class CountView : public QGraphicsView

{

protected:

    void paintEvent(QPaintEvent *event)

    {

        static int n = 0;

        if (n)

            CALLGRIND_START_INSTRUMENTATION

        QGraphicsView::paintEvent(event);

        if (n)

            CALLGRIND_STOP_INSTRUMENTATION

        if (++n == 500)

            qApp->quit();

    }

};

int main(int argc, char *argv[])

{

    QApplication app(argc, argv);

    QGraphicsScene scene;

    scene.setItemIndexMethod(QGraphicsScene::NoIndex);

    ClipItem *clipItem = new ClipItem(0, 0, 100, 100, QPen(), QBrush(Qt::blue));

    clipItem->setFlag(QGraphicsItem::ItemClipsChildrenToShape);

    clipItem->setData(0, "clipItem");

    scene.addItem(clipItem);

    QGraphicsRectItem *scrollItem = scene.addRect(0, 0, 10, 10, QPen(Qt::NoPen), QBrush(Qt::NoBrush));

    scrollItem->setParentItem(clipItem);

    scrollItem->setFlag(QGraphicsItem::ItemIsMovable);

    scrollItem->setData(0, "scrollItem");

    for (int y = 0; y < 25; ++y) {

        for (int x = 0; x < 25; ++x) {

            ClipItem *rect = new ClipItem(0, 0, 90, 20, QPen(Qt::NoPen), QBrush(Qt::green));

            rect->setParentItem(scrollItem);

            rect->setPos(x * 95, y * 25);

            rect->setData(0, qPrintable(QString("rect %1 %2").arg(x).arg(y)));

            rect->setFlag(QGraphicsItem::ItemClipsChildrenToShape);

            QGraphicsEllipseItem *ellipse = new QGraphicsEllipseItem(-5, -5, 10, 10);

            ellipse->setPen(QPen(Qt::NoPen));

            ellipse->setBrush(QBrush(Qt::yellow));

            ellipse->setParentItem(rect);

            ellipse->setData(0, qPrintable(QString("ellipse %1 %2").arg(x).arg(y)));

        }

    }

    scrollItem->setRect(scrollItem->childrenBoundingRect());

#if 0

    ItemMover mover(scrollItem);

#endif

    CountView view;

    view.setScene(&scene);

    view.setSceneRect(-25, -25, 150, 150);

    view.resize(300, 300);

    view.show();

    return app.exec();

}

#include "main.moc"