insert one row and display tow rows in qtableview, with an additional blank row, that's why?

niartirc

hello everyone,

yesterday, i wrote a test programe using QTableView. i define class CustomModel inheriting from QAbstractTableModel , which implemented rowCount, columnCount, data and headerData. the CustomModel has a member customs storing the data, its a QList. i also add a button to add one item to the data.

But when i click the button, the view shows tow columns, one is the item i add, the other is a blank row.

i can't solve it, thanks for your help!

binding model

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    model = new CustomModel(this);
    ui->tableView->setModel(model);
    connect(ui->actionAddItem, &QAction::triggered, this, &MainWindow::onAddCustom);
}

when click a button

void MainWindow::onAddCustom()
{
    Custom* new_custom = new Custom();

    model->appendCustom(new_custom);
}

It is the code inserting one row

bool CustomModel::appendCustom(Custom *custom, const QModelIndex &parent)
{
    beginInsertRows(parent, customs.count(), customs.count()+1);
    customs.append(custom);
    endInsertRows();
    return true;
}

asanka424

Hi,
Parameters you pass to beginInsertRows are wrong. They should be left first and right last index positions after your insert is done. For example if you have 0 items and you insert 1 item, in resulting model will have 1 item who's index is 0. In your function you say it is 1. Therefore view think now you insert two rows 0 and 1

niartirc

@asanka424 it works, thanks for you help.