void Widget::on_pushButton_2_clicked()
{
    printFile();
}



void Widget::printFile()
{


    QPrinter printer;

     QPrintDialog *dialog = new QPrintDialog(&printer);
    dialog->setWindowTitle(tr("Print Document"));
    if (dialog->exec() != QDialog::Accepted)
        return;
    QPainter painter;
    painter.begin(&printer);
    double xscale = printer.pageRect().width()/double(ui->tbl->width());
    double yscale = printer.pageRect().height()/double(ui->tbl->height());
    double scale = qMin(xscale, yscale);
    painter.translate(printer.paperRect().x() + printer.pageRect().width()/2,
                      printer.paperRect().y() + printer.pageRect().height()/2);
    painter.scale(scale, scale);
    painter.translate(-width()/2, -height()/2);

    ui->tbl->render(&painter);


}