To: Jun.Furuse at inria.fr
Cc: lablgtk at kaba.or.jp
Subject: Re: GTree.view#set_model does not work with GTree.tree_store
In-Reply-To: <lw65nvpg5k.wl at inria.fr>
References: <lw65nvpg5k.wl at inria.fr>
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Message-Id: <20030529103544W.garrigue at kurims.kyoto-u.ac.jp>
Date: Thu, 29 May 2003 10:35:44 +0900
From: Jacques Garrigue <garrigue at kurims.kyoto-u.ac.jp>
Lines: 36

From: Jun.Furuse at inria.fr

> I have a trouble of using GTree.view#set_model method 
> to apply a GTree.tree_store model:
> 
>     treeview#set_model tree_store#coerce;
> 
> prints out a critical gobject warning:
> 
> 	(!@#$:25259): GLib-GObject-CRITICAL **: file gobject.c: line 1552 (g_value_set_object): assertion `g_value_type_compatible (G_OBJECT_TYPE (v_object), G_VALUE_TYPE (value))' failed
> 
> and the treeview does not display the content. (And even the program
> crashes sometimes.)
> 
> I found that treeview#set_model is implemented as a setting of 
> GObject property. It seems to work with pure models, 
> but not with tree_stores.

Well, there were two problems: a stupid bug in
GtkTree.TreeView.Properties.model, that refered to vadjustement in
place of model, and another problem with accessing values whose type
are interfaces. I've fixed it (maybe not 100% correct, but I have no
idea what an interface on a non-object would be).
 
> To avoid this problem, I reimplemented the set_model method using
> gtk_tree_view_set_model C function, instead of the property setting.
> Then it works correctly with tree_stores, too.
> 
> Is there anyone who knows the difference between modifying model
> property and gtk_tree_view_set_model ?

In most cases the C function is called to changed the property, so
there is no difference. I was just trying to have the properties work
properly, as in some cases there is no C function available.

          Jacques