Has anyone done dynamic column spanning with a QTableWidget?

[RolandHughes]

If you're using a custom model, then you want QTableView, not QTableWidget, no?

Could you not reimplement QAbstractItemModel::span() to do this? (Duh, I should RTFM - "Note: Currently, span is not used." That's exactly what you need).

What you're asking for sort of breaks the model / view separation. I think you might be able to accomplish what you want by implementing a signal in a custom model that is emitted whenever the Qt::DisplayRole is requested for one of these header row indexes in the QAbstractTableModel::data() method. The widget that contains your QTableView could listen for this signal and set the column span appropriately.

Something like:

QVariant MyCustomModel::data( const QModelIndex & index, int role )
{
    QVariant v;
    if ( Qt::DisplayRole == role )
    {
       v = "whatever";
        if ( indexIsAHeaderRow( index ) )
           emit setColumnSpanForHeaderRow( index.row(), index.column() );
    }
     return v;
}

QVariant MyCustomModel::data( const QModelIndex & index, int role )
{
    QVariant v;
    if ( Qt::DisplayRole == role )
    {
       v = "whatever";
        if ( indexIsAHeaderRow( index ) )
           emit setColumnSpanForHeaderRow( index.row(), index.column() );
    }
     return v;
}

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Thanks. I will give it a whirl. Yes, I meant View. Shouldn't type posts first thing Sunday morning I guess.