White background in window, getting desperate!

[Lesiok]

Calling Sleep() You are blocking a thread and event loop. Window is repainted in more when one event. Just replace Sleep() with mySleep like this :

void MainWindow::mySleep( int ms )
{
    QEventLoop loop;
 
    QTimer::singleShot(ms,&loop,SLOT(quit()));
    loop.exec();
}

void MainWindow::mySleep( int ms )
{
    QEventLoop loop;

    QTimer::singleShot(ms,&loop,SLOT(quit()));
    loop.exec();
}

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