Re: Attach invisible data to a TreeRow?

[Paul Davis <pjdavis engineering uiowa edu>]

Matthias,

Easy.  Just don't add the column of your model to the view.

//The model object.
class EventColumns : public Gtk::TreeModel::ColumnRecord

{
   public:

   EventColumns()
   {
       add( id ) ;
       add( event ) ;
       add( event_name ) ;
       add( x ) ;
       add( y ) ;
       add( lapse ) ;
       add( frame ) ;
       add( extra_parents ) ;
   }

   Gtk::TreeModelColumn<int>           id ;
   Gtk::TreeModelColumn<int>           event ;
   Gtk::TreeModelColumn<Glib::ustring> event_name ;
   Gtk::TreeModelColumn<int>           x ;
   Gtk::TreeModelColumn<int>           y ;
   Gtk::TreeModelColumn<float>         lapse ;
   Gtk::TreeModelColumn<int>           frame ;
   Gtk::TreeModelColumn< vector<int> > extra_parents ;
} ;


//Attach the model to the view
_event_store = Gtk::TreeStore::create( _event_columns ) ;
_cell_events_tree->set_model( _event_store ) ;
_cell_events_tree->append_column( "ID", _event_columns.id ) ;
_cell_events_tree->append_column( "Event", _event_columns.event_name ) ;
_cell_events_tree->append_column( "Frame", _event_columns.frame ) ;


I'm using a TreeStore here, but the idea is exactly the same for 
ListStore IIRC.

Hope that helps.

Paul

Matthias Kaeppler wrote:

> Hello,
>
> I was wondering if it's possible to attach additional, invisible data 
> to a TreeRow in a ListStore. I'm not talking about any actual values 
> which are visible to the user, but some form of meta data which can be 
> used to relate the row to certain other data in an efficient way (e.g. 
> through a pointer).
> I need this kind of funtionality to map filenames in display format to 
> actual filenames on the disk, in order to avoid having two containers 
> of filenames, one holding the actual names, the other the names in 
> displayable format (this would introduce a lot of redundancy).
>
> I thought about deriving from TreeRow and add a new data field, in 
> fact a pointer to the real filename which matches the displayed name 
> in the row, but that doesn't help because ListStore creates the rows 
> for me using append().
>
> Any ideas?
>
> Thanks,
> Matthias
>
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