Qt4 How to draw inside a widget?

Question

Qt4, QtCreator

I am trying to draw inside Widget:

void Widget::on_pushButton_clicked()
{
    QPainter painter;

    painter.begin(ui->label);

    QRe         


        

Answer 1

If you overwrite the paint-method as described by Arnold Spence, you should call the parent's paintEvent or you end up with a widget that only shows your rectangle on a white background.