Date: Wed, 28 May 2003 11:35:51 +0200
Message-ID: <lw65nvpg5k.wl at inria.fr>
From: Jun.Furuse at inria.fr
To: lablgtk at kaba.or.jp
Subject: GTree.view#set_model does not work with GTree.tree_store
MIME-Version: 1.0 (generated by SEMI 1.14.4 - "Hosorogi")
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Hi,

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.

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 ?

--
Jun

-- a simple example --

GMain.Main.init ();;

let cols = new GTree.column_list;;
let col = cols#add Gobject.Data.string;;
let treestore = GTree.tree_store cols;;

let window = GWindow.window ();;
(* Tree view creation *)
let treeview = GTree.view ~packing: window#add ();;

treeview#set_model treestore#coerce;; (* warning... *)

let row = treestore#append ();;
treestore#set ~row ~column: col "hello";;
prerr_endline (treestore#get ~row ~column: col);;
 
window#show ();;
GMain.Main.main ();;