Re: Displaying domain objects with GtkTreeView

[Tristan Van Berkom <tvb gnome org>]

2011/11/28 RafaÅ KrupiÅski <r krupinski gmail com>:
> On 28.11.2011 14:17, Tristan Van Berkom wrote:
> > 2011/11/28 RafaÅ KrupiÅski<r krupinski gmail com>:
> > > Hi all!
> > >
> > > How do I display list of custom objects in GtkTreeView?
> > > GtkTreeView takes GtkListStore as a model, but it doesn't allow custom
> > > objects, only list of gobjects.
> >
> > What could that possibly mean ?
> >
> > If you have custom derived GObjects, you can certainly populate a
> > list-store with them.
> >
> > If you have "something-else-objects" that are not GObjects, you can always
> > use
> > G_TYPE_POINTER to hold them (it would be up to you to ensure that their
> > life
> > cycle is somehow bound to the liststore... i.e. that those objects are
> > not destroyed
> > while cell renderers are trying to access them).
>
> How exactly do I do that? I only know that cell renderers can access model
> fields by index, which implies that the model must be a list (or tuple,
> since I'm using python).

The model must be a GtkTreeModel, the GtkTreeModel implementation can
be a flat list, implementations are allowed to let rows have children (i.e. it
can be a tree of data).

I don't know what API python is giving to you, if it's so very
different than the
C API than that is a good way to obfuscate code and confuse new users.

> > > On the other hand, when I want to read list's selection all I get is
> > > the GtkListStore model - list of gobjets and I have to figure out the
> > > actual domain object the data comes from.
> >
> > You don't get a list of gobjects as far as I know, I'm not sure where you
> > are
> > getting that from.
>
> [...]
>
> Ok, I'm noob with Gtk/GLib, so I might've used wrong words. Plus I'm using
> python, so I didn't have to care about GTypes/GObjects.
>
> Anyway, I can display ListView using list of strings as a model. That data
> is copied from my domain object. The problem is, when I read the data from
> the ListView I get those strings and I have to figure out the actual domain
> object for myself.

I suppose this "domain object" is another Python concept ? or a concept which
is local to your program's business logic ?

> I wanted to know how to use my domain object as a ListStore model for
> reading and writing - that chapter is missing from the Tree View Tutorial
> I've found.
>
> Best Regards
> RafaÅ KrupiÅski