Date: Mon, 13 Oct 2003 15:24:56 +0100
Cc: lablgtk at kaba.or.jp
Subject: Re: Bug when changing the contents of a frame
Message-ID: <20031013142456.GC26162 at redhat.com>
References: <20031013133019.GA26162 at redhat.com> <16266.45995.39355.140798 at akasha.ijm.jussieu.fr>
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In-Reply-To: <16266.45995.39355.140798 at akasha.ijm.jussieu.fr>
From: Richard Jones <rich at annexia.org>

On Mon, Oct 13, 2003 at 04:16:11PM +0200, Olivier Andrieu wrote:
>  Richard Jones [Monday 13 October 2003] :
>  > Fatal error: exception Glib.Critical("Gtk", "file gtkcontainer.c:
>  > line 984 (gtk_container_remove): assertion `widget->parent ==
>  > GTK_WIDGET (container)' failed")
> 
> that means you're calling some_container#remove some_widget but the parent
> of some_widget is not some_container. Indeed, in your code, the value
> returned by show 2 and stored in the reference is a GMisc.label contained
> in a vbox. show 2 should return the vbox, not the last widget added to
> it.

Hmmmm ... that was a bug in my minimal example. The real program is of
course much larger, so I'll need to go back and see if I can reproduce
it now :-)

> BTW, since a GtkFrame is a GtkBin, it can only contain one widget. So
> your code could be simplified ; you can drop the reference cell and
> define remove that way :
> 
>  let remove () = frame#remove (List.hd frame#children)

OK. I tried doing this before:

	List.iter (fun w -> frame#remove w) frame#children

but that removed the label widget (part of the frame itself), which
was rather drastic. Is frame#children guaranteed to return the child
widgets in a known order?

Rich.

-- 
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