[gtkada] Question wrt using the new paradigm for connecting handlers to signals

[Rob Groen]

Hello all, 

I am having a bit of trouble using the new paradigm for connecting
handlers and signals. 

E.g. I have a Gtk_Entry and I want a handler to connect to the "changed"
signal. So I expect an On_Changed (object, …) method in Gtk.Gentry.
However, the "changed" signal is defined on a Gtk_Editable (a
Gtype_Interface) and not on a Gtk_Entry. I know that Gtk_Entry
implements Gtk_Editable, but if I want to connect with the On_Changed
method I need to convert the entry to a Gtk_Editable, and then also the
profile of the handler needs to specify a Gtk_Editable instead of a
Gtk_Entry, which is not very nice and requires yet another conversion in
the handler. 

I know I can use the old way, using instantiations of Gtk.Handlers, but
that leads to a mixed approach: some handlers need to be connected the
old school way (i.e. the ones that have signals on Gtype_Interfaces the
object implements), others can use the <object>.On_<signal> method. 

Is there a way to use the new paradigm without the conversion to/from a
Gtype_Interface ? 

Regards, Rob 
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