Why cellWidgets in a QTableWidget can not scroll when it's in a QGraphicsScene?

**Mavis** · 19th July 2010, 07:06

I need some animation with QTableWidget, so using QGraphicsScene and QGraphicsView.
When I scroll the table's scrollbar, the cellWidgets can not scroll or update at all but the QTableWidgetItem can!

Please see the attachment for my screenshot: The first picture Screenshot.png is not correctly scroll.
The second picture Screenshot-1.png is correctly scroll. This table shown correct when there's no view/scene.

Below is my code:

Qt Code:

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#include <QtGui>
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QGraphicsScene scene;
    scene.setSceneRect(0, 0, 400, 200);
 
    QTableWidget *table = new QTableWidget;
    table->setColumnCount(2);
    table->setRowCount(10);
 
    for (int i=0; i<10; i++) {
        QString str;
        str.setNum(i);
        table->setItem(i, 0, new QTableWidgetItem(str));
        table->setCellWidget(i, 1, new QPushButton(str));
    }
 
    scene.addWidget(table);
 
    QGraphicsView *view = new QGraphicsView(&scene);
    view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    view->show();
 
    return app.exec();
}

#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QGraphicsScene scene;
    scene.setSceneRect(0, 0, 400, 200);

    QTableWidget *table = new QTableWidget;
    table->setColumnCount(2);
    table->setRowCount(10);

    for (int i=0; i<10; i++) {
        QString str;
        str.setNum(i);
        table->setItem(i, 0, new QTableWidgetItem(str));
        table->setCellWidget(i, 1, new QPushButton(str));
    }

    scene.addWidget(table);

    QGraphicsView *view = new QGraphicsView(&scene);
    view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    view->show();

    return app.exec();
}

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Is it a bug of QT4.6?
Can anyone tell me the reason? Thanks.