removing row from QTableWidget, showing no effect

[aurora]

I used backword loop, removing items from last,
As shown below

int m=ui->tableWidget_ouput->rowCount();
            while(m>=NewRow)
            {
            ui->tableWidget_ouput->removeRow(m);
             m--;
            }

int m=ui->tableWidget_ouput->rowCount();
            while(m>=NewRow)
            {
            ui->tableWidget_ouput->removeRow(m);
             m--;
            }

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[Lykurg]

Ehm, what about QTableWidget::clearContents() or QTableWidget::clear()?

EDIT: Forget it, read too fast, didn't see NewRow...

[ChrisW67]

I went there too. Those functions remove the content from the table but leave the dimensions the same, i.e. rowCount() is unchanged. Contrast that with removeRow(), as used in the original post, which actually shrinks the table. I guess it really depends on what your application actually requires.

[wysota]

Wouldn't this be the quickest?

ui->tableWidget->setRowCount(NewRow);

ui->tableWidget->setRowCount(NewRow);

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I don't know what happens with those excessive items, if they are deleted or not.

[Lykurg]

Because I was curious:

void QTableModel::setRowCount(int rows)
{
    int rc = verticalHeaderItems.count();
    if (rows < 0 || rc == rows)
        return;
    if (rc < rows)
        insertRows(qMax(rc, 0), rows - rc);
    else
        removeRows(qMax(rows, 0), rc - rows);
}

void QTableModel::setRowCount(int rows)
{
    int rc = verticalHeaderItems.count();
    if (rows < 0 || rc == rows)
        return;
    if (rc < rows)
        insertRows(qMax(rc, 0), rows - rc);
    else
        removeRows(qMax(rows, 0), rc - rows);
}

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Yes, they are!