screen->setAlignment(Qt::AlignBottom | Qt::AlignLeft);
screen->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
screen->setReadOnly(true);
QVBoxLayout * mainLayout = new QVBoxLayout;
mainLayout->addWidget(screen);
screen->setAlignment(Qt::AlignBottom | Qt::AlignLeft);
screen->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
screen->setReadOnly(true);
QVBoxLayout * mainLayout = new QVBoxLayout;
mainLayout->addWidget(screen);