How to prevent opening the same record in a new window more than once in QTableView ?

[zed220]

Hi All,
I wonder if anyone can help, I have a QTableView where I'm displaying list of records, to display further details of any record I'm opening a new window by clicking on the record, all well apart from that I can open the SAME record more than once, How can I prevent this happening ?

this is what I have so far

while(qry.next())
        {
            QSqlQueryModel *model = new QSqlQueryModel();
            model->setQuery(qry);
        }
        connect(ui->tableView_visitLog, SIGNAL(pressed(const QModelIndex&)), this,
                SLOT(on_tableView_visitorLog_clicked(const QModelIndex&)));
 
 
void ControlPanel::on_tableView_visitorLog_clicked(const QModelIndex& index)
{
    const QAbstractItemModel* tableModel = ui->tableView_visitLog->model();
    int visitor_id = tableModel->data(tableModel->index(index.row(),0), Qt::DisplayRole).toInt();
    visitordetails = new VisitorDetails(visitor_id, this);
    visitordetails->show();
}

while(qry.next())
        {
            QSqlQueryModel *model = new QSqlQueryModel();
            model->setQuery(qry);
        }
        connect(ui->tableView_visitLog, SIGNAL(pressed(const QModelIndex&)), this,
                SLOT(on_tableView_visitorLog_clicked(const QModelIndex&)));


void ControlPanel::on_tableView_visitorLog_clicked(const QModelIndex& index)
{
    const QAbstractItemModel* tableModel = ui->tableView_visitLog->model();
    int visitor_id = tableModel->data(tableModel->index(index.row(),0), Qt::DisplayRole).toInt();
    visitordetails = new VisitorDetails(visitor_id, this);
    visitordetails->show();
}

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