QT tableview 怎样判断是否为空？

void MainWindow::on_pushButton_clicked()

{

    if(!ui->tableView->verticalHeader()->count())

    {

        ui->lineEdit->setText("empty tableview");

        QStandardItemModel *model = new QStandardItemModel( 2,3,this);

        model->setHorizontalHeaderItem(0, new QStandardItem(QString("Column0 Hearder")));

        model->setHorizontalHeaderItem(1, new QStandardItem(QString("Column1 Hearder")));

        model->setHorizontalHeaderItem(2, new QStandardItem(QString("Column2 Hearder")));

        ui->tableView->setModel(model);

    }

    else

        ui->lineEdit->setText("not empty!");

}