[Qt-interest] ModelView - how to use proxies to filter this data?

[Sean Harmer]

Hi,

On Tuesday 01 December 2009 15:36:18 Daniel Price wrote:
> Thanks for the info. I hadn't considered using a proxy filter and just
>  accepting/rejecting rows. Does that work with hierarchical data though?

Yes it works absolutely fine with hierarchical data as that is what I am using.

> I actually QAbstractProxyModel and implemented the mapTo/mapFrom functions.
>  But sorting doesn't seem to work.

Yeah I thought about doing it that way, but then decided that 
QSortFilterProxyModel fitted my needs with a little subclassing.

> BTW it looks like you're storing pointers to your structures in your
>  variants as integers and casting them back. 

No I am storing them as void* in the QModelIndex's internal pointer so that is 
why I am casting them back to my specific types. My model's index function 
looks like this:

QModelIndex MapsData1DTreeModel::index( int row, int col, const QModelIndex& 
parent ) const
{
    MapsData1DTreeModelGroupNode* parentItem;
    if ( !parent.isValid() )
        parentItem = m_root;
    else
        parentItem = static_cast<MapsData1DTreeModelGroupNode*>( 
parent.internalPointer() );

    MapsData1DTreeModelNode* childItem = parentItem->child( row );
    if ( childItem )
        return createIndex( row, col, childItem );
    else
        return QModelIndex();
}

Good luck.

Sean