Re: GtkTreeView data

[Gabriel de Perthuis <Gabriel de-Perthuis laPoste net>]

Le jeudi 14 avril 2005 Ã 18:23 +0100, Kris Marsh a Ãcrit :
> Hi,
>
> I'm trying to attach extra information to each row in a list, and then 
> retrieve it later on from a row on 
> a double click (row_activated) event.
> Basically, i've tried:
>
> g_object_set_data(G_OBJECT(&iter_child), "my_info", 
> GUINT_TO_POINTER(some_info));
>
> Upon inserting an item into the list and then tried to retrieve it in my 
> callback, but it crashes on insert.
>
> 1) What should I be trying to link my extra data to? (I assumed the iter 
> that comes out from 
> gtk_tree_store_append), but could be wrong.
You hook it as a new column of the model, for which you must give a
position and a type.

> 2) How can I do this. Eventually the data is going to be either a char array 
> or a pointer to a structure

Note that the data must be a GObject, in particular with respect to
memory management (refcounting).
The simple way to register your arbitrary data type is to write a clone
and a free routine, and register them along with a new boxed type.
See g_boxed_type_register_static:
http://developer.gnome.org/doc/API/2.0/gobject/gobject-Boxed-Types.html

Wrap this up in a get_my_type routine that has a static variable and
does the actual call only once, and use the routine when registering the
extra model column.

(that's a problem I had some time ago on this list, and it didn't work
out immediately)