Re: gtkada Connecting via the Gtk.Handlers object_connect problem

[Alain De Vos <devosalain71@gmail.com>]

On Sunday, November 3, 2019 at 2:26:37 PM UTC+1, Alain De Vos wrote:
> On Sunday, November 3, 2019 at 2:03:55 PM UTC+1, Dmitry A. Kazakov wrote:
> > On 2019-11-03 12:37, Alain De Vos wrote:
> > > I try an application with one button and one label and one handler
> > > 
> > > http://docs.adacore.com/live/wave/gtkada/html/gtkada_ug/signals.html#second-case-using-object-connect-instead
> > > -------------------------
> > > I have a file myvboxpak.ads ->
> > > package myvboxpak is
> > > 
> > >     type MyVBoxR is new Gtk_VBox_Record with record
> > >        Button : Gtk_Button;
> > >        Label  : Gtk_Label;
> > >     end record;
> > >     type MyVBoxT is access all MyVBoxR'Class;
> > > 
> > >     package MYCB is new Gtk.Handlers.User_Callback(Glib.Object.GObject_Record,MyVBoxT);
> > > 
> > >     procedure MyButtonClick (T : MyVBoxR'Class);  --eventhandler                                ^^^^^^^^^^^^^^^^^^^
> > Should have been               T : access MyVBoxR'Class
> > 
> > -- 
> > Regards,
> > Dmitry A. Kazakov
> > http://www.dmitry-kazakov.de
> 
> I changed the handler to :
> package body myvboxpak is
>    procedure MyButtonClick (T : access MyVBoxR'Class) is
>    begin
>       begin
>          T.Button.Set_Label ("You pressed");
>     ...
> 
> Compile error of the connect_object function is still :
> MYCB.Object_Connect
>            (Widget => MYVBOX.Button,  
>             Name   => "clicked",
>             Marsh  => MYCB.To_Marshaller (MyButtonClick'Access),  --  The signal handler
>             Slot_Object =>Top,
>             User_Data => MYVBOX
>             );
> Error : 
> Compile
>    [Ada]          hello.adb
> hello.adb:35:27: no candidate interpretations match the actuals:
> hello.adb:35:56: expected type "Handler" defined at gtk-marshallers.ads:546, instance at gtk-handlers.ads:1164, instance at myvboxpak.ads:17
> hello.adb:35:56: found type access to procedure "MyButtonClick" defined at line 35
> hello.adb:35:56:   ==> in call to "To_Marshaller" at gtk-handlers.ads:1205, instance at myvboxpak.ads:17

Some additional info :
   mymarsh : Gtk.Marshallers.General_Handler;
   
   mymarsh := MYCB.To_Marshaller (Cb => MyButtonClick'Access);

Error : no candidate interpretations match the actuals expected type "Handler"

package MYCB is new Gtk.Handlers.User_Callback(Glib.Object.GObject_Record,MyVBoxT);

      MYCB.Object_Connect
           (Widget => MYVBOX.Button,  
            Name   => "clicked",
            Marsh  => mymarsh, 
            Slot_Object =>Top,
            User_Data => MYVBOX,
            After => False
            );

Error : 
            Marsh  => mymarsh, 
Expected type marchaller.