Re: custom treemodel?

["Andrew E. Makeev" <andrew solvo ru>]

Murray Cumming wrote:

> > After poking around a bit in my freshly built gtkmm, I noticed this:
> >
> > gtkmm/examples/Makefile.am
> > # Doesn't build with GLIBMM_ENABLE_PROPERTIES unset:
> > #cellrenderercustom
> >
> > Dunno if thats important or not though.
> >    
>
> That's a different example.
>
> There's a note in the ChangeLog about that.
>
>  
There is .../examples/treemodelcustom/ directory with files that you 
need to review.
I've used it to create custom LIST and TREE models.
Just read carefully Gtk::TreeModel and Gtk::TreeModelSortable (classes 
you should derive from to implement your model functionality) 
documentation about which methods you should reimplement. It took a 
while for me to understand right ones (mostly looking at gtkmm/gtk+ 
source codes). The main problem was to desing iterators properly 
(especially for TREE).

Actually, I wonder if it is possible that gtkmm provide custom model 
implementation. Developer should just provide data container class 
derived from some Gtk::virtual-base class and reimplement methods to 
get/set data from/to your container by given Gtk::TreeModelPath or 
Gtk::TreeIter, and column index/reference, and methods to sort data if 
needed. Just there is too much code you should rewrite for your custom 
model now.

Regards,
-andrew