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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: GtkAda callback and event
Date: Sun, 5 Sep 2021 16:48:02 +0200
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On 2021-09-05 15:50, DrPi wrote:
> Le 05/09/2021 à 00:29, Dmitry A. Kazakov a écrit :

> With "Gtk.Arguments.Unchecked_To_Gdk_Event_Motion (Params, 1);" , I get 
> an error :
> expected private type "C_GValues" defined at glib-values.ads:53
> found private type "GValues" defined at glib-values.ads:48

I see, then you must to implement it yourself. It could be something 
like this (not tested):

    package Conversions is
       new System.Address_To_Access_Conversions (Gdk_Event_Motion);

    Event : Gdk_Event_Motion renames
            Conversions.To_Pointer (Get_Address (Nth (Params, 1))).all;

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de