How to close a dialog with an OK button using a condition

Question

My code

my first attempt so I could get the result in Mainwindow.cpp but it could be //incorrect

void Dialog::on_buttonBox_accepted()
 {
     Cities.clear();
     for(int row = 0; row<ui->tableWidget->rowCount(); row++)
     {
         cities s(get_city(row),get_time(row,3),get_time(row,4));
         Cities.push_back(s);
     }
 }
// my attempt to make another button but I could not get a result in 
//Mainwindow.cpp but could check correctly
void Dialog::on_pushButton_clicked()
{
    if(cities_is_filled())
    {
        Cities.clear();
        for(int row = 0; row<ui->tableWidget->rowCount(); row++)
        {
            cities s(get_city(row),get_time(row,3),get_time(row,4));
            Cities.push_back(s);
        }
    }
}

//GET RESULT
void MainWindow::on_actionAdd_train_triggered()
{
    Dialog e;
    if(e.exec())
    {
       for(auto City: e.Cities)
       {
           ui->textBrowser->append(City.city_+ " " + City.depart_+ " " 
           +City.leave_);
       }
    }
}

If the table cell is empty when I press OK, the dialog closes - but I would like it to not close. How can I implement this?

Answer 1

Press right click mouse on your buttonBox then select Go To Slot... then choose accepted() slot.

Now add your condition to the accepted function:

void MainWindow::on_buttonBox_accepted()
{
    if(ui->tableWidget->item(1,2)->text() != "") // for example
    {

    }
    else
    {
        qApp->exit();
    }
}

QDialogButtonBox Class