From: Neil Conway <nconway@...>
Date: 2001-09-22T08:25:26+09:00
Subject: [ruby-talk:21506] Re: ruby-gtk and entry validation

Hi,

On Thu, 2001-09-20 at 19:24, Ned Konz wrote:
> The Gtk FAQ has an example of validating a Gtk::Entry field using an 
> insert_text handler:
>
> [snip C code]
> 
> The problem is that I can't find any way in ruby-gtk to do this. There is 
> signal_handler_unblock in Gtk::Object but not 
> signal_handler_unblock_by_func().

Okay, the reason you can't find those functions is because they're not
implemented ;-)

It's a bit difficult to implement them properly because of the way that
signal handlers are implemented in Ruby/GTK: as (anonymous) blocks. This
is convenient, but it means that the programmer can't refer back to the
signal handler by name. I'm still thinking about how to do this. For
now, here's a simple work-around: signal_connect returns the connection
ID of the newly created signal handler. Then you can use the Gtk::Object
methods signal_handler_block() and signal_handler_unblock(), which take
the connection ID. I haven't tested it but AFAICT it should work.

In the upcoming Ruby-GNOME 0.26, the missing functions will at least
call rb_notimplement() and bail out; if anyone can think of a way to
implement these functions nicely, let me know.

Cheers,

Neil Conway
Ruby-GNOME maintainer