From: Lyle Johnson <ljohnson@...>
Date: 2002-03-01T08:59:08+09:00
Subject: Re: FXRuby: Reacting on changing values of FXDataTarget

> How would I accomplish this?!

You want to catch either the SEL_COMMAND or SEL_CHANGED message being sent
by the data target after its value changes. For the FXRuby-0.99.189 release
(which is also the released bundled with the latest Ruby installer for
Windows) you'll need to first hack the "lib/fox/responder2.rb" file and add
these lines:

    class FXDataTarget
        include Responder2
    end

(This has already been fixed for the next release.) Once you've applied that
patch, try adding the following lines to your example program, right after
the line that creates the "@selected" data target:

    @selected.connect(SEL_CHANGED) do |sender, sel, ptr|
      str = "Ruby tuesday..."
      idx = @selected.value
      @field.text = str[0...(idx-1)] + "[" + str[(idx-1)..(idx-1)] + "]" +
str[idx..-1]
    end

This tells FOX that when the slider data target's value changes, it should
run this code block. We grab the current slider value, and then construct
the modified string (where the idx'th character is surrounded by braces).
And then we assign that string to the text field.

Hope this helps,

Lyle