From: nconway@... (Neil Conway)
Date: 2001-10-18T06:32:29+09:00
Subject: [ruby-talk:22690] Re: Gtk::Text connect_signal key_press_event eat keystroke?

On Thu, Oct 18, 2001 at 06:07:16AM +0900, Phlip wrote:
> Rubies:
> 
> In Gtk I want to handle a keystroke, and then remove it from the food chain.
> 
> I call this from the initialize of a class derived from Gtk::Text:
> 
>         signal_connect ('key_press_event') { |w, e|
>         	e.keyval = 0 if e.string == "\t"
>         }
> 
> That should, for example, disable the Tab key for my hapless user.
> 
> But e.keyval has no e.keyval= version, so the above does not execute.
> 
> How do I censor a keystroke?

My guess is to connect to the "insert-text" signal; according to
the docs:

    The default signal handler for this signal will normally be
    responsible for inserting the text, so by connecting to this
    signal and then stopping the signal with gtk_signal_emit_stop(),
    it is possibly to modify the inserted text, or prevent it from
    being inserted entirely.

However, it appears that gtk_signal_emit_stop() isn't implemented
yet -- I'll take a look at it and see if I can get something
in CVS tonight.

There may be a better alternative, however -- that's just the first
one I thought of.

Cheers,

Neil