QTableView, QStandardItemModel and drag and drop sorting

[steveq]

Hey All,

I've found quite a few search results on this topic but still don't have an answer to my question.

I've created a QTableView with a QStandardItemModel and drag and drop enabled like so:

    m_model = new QStandardItemModel( 0, 2, this);

    m_model->setHorizontalHeaderItem(0, new QStandardItem(QString("Switch Name")));
    m_model->setHorizontalHeaderItem(1, new QStandardItem(QString("Mnemonic")));

    ui->mnemonicTable->verticalHeader()->setSectionsMovable(true);
    ui->mnemonicTable->setDragEnabled(true);
    ui->mnemonicTable->setSelectionBehavior(QAbstractItemView::SelectRows);
    ui->mnemonicTable->setSelectionMode(QAbstractItemView::SingleSelection);
    ui->mnemonicTable->setDragDropMode(QAbstractItemView::InternalMove);
    ui->mnemonicTable->setDropIndicatorShown(true);
    ui->mnemonicTable->setDragDropOverwriteMode(false);

    ui->mnemonicTable->setModel(m_model);

Visually I am able to drag and drop to sort the table rows successfully. However once I retrieve the data from the table, it is still in the same order it was in prior to the sort. I traverse the table data like this:

    // Save out the switch name and its mnemonic
    for ( int i = 0; i < m_model->rowCount(); i++ )
    {
        key = "Switch" + QString::number(i + 1);

        item = m_model->item( i, 0 );

        if ( item ) switchName = item->text();

        item = m_model->item( i, 1 );

        if ( item ) mnemonic = item->text();

        if ( mnemonic.isEmpty() ) mnemonic = "????";

        iniReaderSave.beginGroup( key );
        iniReaderSave.setValue( "SwitchName", switchName );
        iniReaderSave.setValue( "Mnemonic", mnemonic );
        iniReaderSave.endGroup();

        count++;

        mnemonic = "";
    }

It's like the table is not passing on the re-sort to the model.

• Could someone possibly clear this up for me please. What am I doing wrong?

Many thanks,

Steve Q. :-)

[Diracsbracket]

Hi.
You can save the visual order of your rows by mapping the visual indices of the verticalHeader object to their logical indices, for example:

    // Save out the switch name and its mnemonic
    for ( int i = 0; i < m_model->rowCount(); i++ )
    {
        key = "Switch" + QString::number(i + 1);
        
        const int k = ui->mnemonicTable->verticalHeader()->logicalIndex(i);
        item = m_model->item( k, 0 );

        if ( item ) switchName = item->text();

        item = m_model->item( k, 1 );
       ...
    }

[steveq]

Hi Diracsbracket,

That's exactly what I was after! Legend.

Thanks so much for your help!

Steve Q. :-)