Re: Deriving from Gtk::ListStore

[Joaquim Schmidlap <schmidlap schmidlap org>]

On Dec 12, 2007, at 4:37 AM, Murray Cumming wrote:
> On Wed, 2007-12-12 at 11:33 +0300, Andrew E. Makeev wrote:
> > В Втр, 11/12/2007 в 12:53 -0600, Joaquim Schmidlap пишет:
> > > Can anyone offer a roadmap or an example on how to proceed from  
> > > here? At
> > > first cut, it looks like deriving from ListStore is a lot of  
> > > work, and might
> > > require me to build my own iterator classes, etc. which seems  
> > > like a lot of
> > > work. Or, is there a better way to wrap up the behavior I want to  
> > > hide?
> >
> > Actually, there is not so much work to implement your own TreeModel.
> >
> > Look at treemodelcustom/ example, and read documentation carefully
> > (there are few method implementations missed in example to make it  
> > work
> > completelly right).
> >
> > And you should derive from TreeModel, TreeModelSortable (if you will
> > implement sorting).
> >
> > Unfortunatelly, you have to implement Iterator behavior, but  
> > that's not
> > so complicated as you may think. You shall learn everything from
> > example.
>
> I still don't think that deriving a TreeModel is documented well  
> enough,
> but yes, it's possible.
>
> Depending on the situation, you might also solve your problem by using
> the cell_data_func() technique:
> http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/ 
> classGtk_1_1TreeViewColumn.html#765296845c9e9757ba405becbbc13d96

As it turns out, simply deriving from ListStore and TreeStore is  
working just fine for my needs. All I needed to do to meet my  
requirements for now was to override set_value_impl, which is how all  
the various iterators and operators ultimately write into the model  
proper.

Thanks for the suggestions.

JS