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

[Daniel Price]

Forgot to CC the list.

> -----Original Message-----
> From: Stephen Kelly [mailto:steveire at gmail.com]
> Sent: 02 December 2009 13:14
> To: Daniel Price
> Subject: Re: [Qt-interest] ModelView - how to use proxies to filter
> this data?
> 
> Daniel Price wrote:
> 
> > 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?
> 
> You could do this using a proxy. The way I've done it is to flatten the
> tree
> into a list, then filter out Company* from the list.
> 
> Some screenshots here:
> 
> http://api.kde.org/playground-api/pim-
> apidocs/akonadi/akonadi_next/html/index.html
> 
> (Look for DescendantEntitiesProxyModel)
> 
> All the best,
> 
> Steve.
> 
> >
> >
> >> -----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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