#include <QtGui>
#include <QDialog>

class dlg : public QDialog
{
public:
    dlg() ;

    static QProgressBar * pb ; 
} ;

class rainbow_widget : public QWidget
{
public:
    rainbow_widget( QWidget * p ) : QWidget(p) {}
protected:
    virtual void paintEvent( QPaintEvent * /*ev*/ )
    {
        QPainter p( this ) ;

        p.fillRect( 0, 0, 80, 20, QBrush( Qt::darkGreen ) ) ;

        QBrush colors[4] = 
        {
            QBrush( Qt::black )
          , QBrush( Qt::cyan )
          , QBrush( Qt::red )
          , QBrush( Qt::magenta )
        } ;

        for( int i = 0; i < 4 ; ++ i )
        {
            int const thickness = 5 ;
            int y = i * thickness ;
            p.fillRect( 0, y, 80, thickness, colors[i] ) ;

            dlg::pb->setValue( i + 1 ) ;
        }
    }
} ;

dlg::dlg()
{
    resize( 100, 100 ) ;

    pb = new QProgressBar( this ) ;
    pb->setGeometry( 10, 50, 80, 20 ) ;
    pb->setTextVisible( false ) ;
    pb->setRange( 0, 4 ) ;

    rainbow_widget * rw = new rainbow_widget( this ) ;
    rw->setGeometry( 10, 10, 80, 20 ) ;
}

QProgressBar * dlg::pb = 0 ;

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);

     dlg d ;

     d.exec() ;

     return 0 ;
 }