1  void MainWindow::on_addButton_clicked()
2  {
3    if ((ui->enterLineEdit->text())== "")
4        QMessageBox::information(this, "out", "Enter an item");
5    else {
6        ui->listWidget->setFont(ui->fontComboBox->currentFont());
7        ui->listWidget->addItem(ui->enterLineEdit->text());
8    }
9    ui->enterLineEdit->setText("");
10 }