From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=unavailable autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED.3d73Ybk3C5U4I2t8lv+lAQ.user.gioia.aioe.org!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: gtkada evenhandler on_procedure method , how to access children of topwindow in the eventhandler Date: Sat, 2 Nov 2019 17:18:38 +0100 Organization: Aioe.org NNTP Server Message-ID: References: <24540edc-eb1d-40d4-99ab-7ff54c5e61d6@googlegroups.com> NNTP-Posting-Host: 3d73Ybk3C5U4I2t8lv+lAQ.user.gioia.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 X-Notice: Filtered by postfilter v. 0.9.2 Content-Language: en-US Xref: reader01.eternal-september.org comp.lang.ada:57444 Date: 2019-11-02T17:18:38+01:00 List-Id: On 2019-11-02 16:27, Alain De Vos wrote: > In the main program I can have, > MyVBox.Button.On_Clicked (Call => On_Button_Click'Access, Slot => Top); > MyVBox.Button.On_Clicked (Call => On_Button_Click'Access, Slot => MyVBox); > with > Top : Gtk.Window.Gtk_Window; > MyVBox : MyVBoxT; > Both work fine, > > In handler i can have, > procedure On_Button_Click (Top : access Glib.Object.GObject_Record'Class), > this works fine, > But when i try : > procedure On_Button_Click (MyVBox : access Gtk_Button_Record'Class) Because Gtk_Button_Record'Class and GObject_Record'Class are two different types. On_Clicked with Slot parameter require downcasting, which is why you should use Gtk.Handlers.User_Callback instead. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de