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From: hreba <f_hreba@yahoo.com.br>
Newsgroups: comp.lang.ada
Subject: Re: Where do I get my Cairo context from (in GTK3)?
Date: Mon, 25 Apr 2016 12:03:03 +0200
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Date: 2016-04-25T12:03:03+02:00
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On 04/25/2016 09:40 AM, Dmitry A. Kazakov wrote:

> If you instantiate it with GObject, why using Gtk_Widget instead?

I use Glade and Gtk_Builder.Get_Object returns GObject. Nearly all 
examples for handler connection use Gtk_Widget so I did the same.
>
> I suppose sn_draw is "draw".
>
Correct.

>> So where do I get the cairo context from?
>
> As you did. Just make sure that all parameters of Connect match. Instead
> of pointer conversion use object conversion. E.g.
>
>     Gtk_Widget_Record'Class (Obj.all)'Unchecked_Access

So I changed my call of Connect to

        DA_Ret_Callback.Connect
	(Gtk.Widget.Gtk_Widget_Record'Class(obj.all)'Unchecked_Access,
	 sn_draw,
	 DA_Ret_Callback.To_Marshaller(Draw_Handler'Access),
	 hd);

but I still get the same error message from the compiler.
-- 
Frank Hrebabetzky		+49 / 6355 / 989 5070