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

[Daniel Price]

I've been playing with this sortfilter approach and it works fine if the layout of the source matches the output. However, what if my source items are buried away?

Eg:

--Companies
----Company1
------Product1
------Product2
------Product3
----Company2
------Product4

The above is stored within a QAbstractItemModel and I want to use a proxy to just pull out all the products to give me this in a table:

--Product1
--Product2
--Product3
--Product4

How could I do this using a proxy? If I store a unique identifier in each of the product rows identifying it as a Product record, could I somehow use the built-in filtering to get just those rows?


> -----Original Message-----
> From: qt-interest-bounces at trolltech.com [mailto:qt-interest-
> bounces at trolltech.com] On Behalf Of Sean Harmer
> Sent: 01 December 2009 15:54
> To: qt-interest at trolltech.com
> Subject: Re: [Qt-interest] ModelView - how to use proxies to filter
> this data?
>
> 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
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