How to insert new row under a selected row in my QStandardItemModel in a TableView ?

[imene]

Hi,
What to change in this code to be able to insert new row under a selected row in my QStandardItemModel in a TableView ?

My code insert new row after the last row of the table:

void MainWindow::on_Add_Row_Button_clicked()
{
       mModel->insertRow(mModel->rowCount());
}

i can delete selected row by this code:

void MainWindow::on_Delete_Row_Button_clicked()
{
    
    QModelIndexList indexes = m_ui->Table_CSV->selectionModel()->selectedRows();
        while (!indexes.isEmpty())
        {
            mModel->removeRows(indexes.last().row(), 1);
            indexes.removeLast();
        }
}

[JonB]

@imene said in How to insert new row under a selected row in my QStandardItemModel in a TableView ?:

My code insert new row after the last row of the table:

mModel->insertRow(mModel->rowCount());

I'm quite sure you previously asked just this a few days and I answered there. The answer really is perfectly evident for this insertRow(), and is also clearly in the documentation.

[imene]

Hi @JonB,
in fact at the begeninig i didn't understand the role of mModel->rowCount() inside insertRow() here did you have any idea about it ?
Now i get it it returns number of the row just added.
How can i get the index of selected row to put it into: insertRow() ?

[JonB]

@imene
Yes, I don't see how you can not follow what it does! :) Let's read bool QAbstractItemModel::insertRow(int row, const QModelIndex &parent = QModelIndex())

Inserts a single row before the given row in the child items of the parent specified.

(For a table rather than a tree, which is what you have, ignore parent, it's optional, don't specify anything for that.) When you insert something, you have to say where to insert it. And the docs tell you that is just what the int row parameter is: it inserts the row immediately before the row number you specify. Now is that not crystal clear? :)

So if, for example, you specified 0 for row it would insert your new row immediately before/above row #0, so the newly inserted row would be the (new) very first one in the table. Now, you were specifying mModel->rowCount() for that --- which is 1 beyond the last row in the table (rows count from 0 to rowCount() - 1). So if it inserts before that it means it must insert at the end of the table, after the last row. So that's why it appears there with that code --- inserting at rowCount() appends a row to the table.

[imene]

@JonB said in How to insert new row under a selected row in my QStandardItemModel in a TableView ?:

insertRow()
Yeah it's so clear now Thanks a lot:
So if i want to add a new row under a selected line, i have to add +1 the index value isn't it ?
I'm gonna work on it and share results with you.

[JonB]

@imene said in How to insert new row under a selected row in my QStandardItemModel in a TableView ?:

i have to add +1 the index value isn't it ?

Indeed! +1 to insert below/after a row number, instead of before.

[imene]

Hi @JonB , yeah just below the selected row
It works now i do it this way:

    QModelIndex currentIndex = m_ui->Table_CSV->selectionModel()->currentIndex();

    mModel->insertRow((currentIndex.row())+1);