From: "Stephan Kämper" <Stephan.Kaemper@...>
Date: 2002-03-01T06:38:55+09:00
Subject: FXRuby: Reacting on changing values of FXDataTarget

Hi all,

I'd like to react on changing values of an FXDataTarget.

Say I have the following code (improve it as you see fit...)

<code>

require "fox"
include Fox

class FXDataTargetExample < FXMainWindow

  def initialize( app )

    super( app, "Yet another Example", nil, nil, DECOR_ALL, 0, 0, 270,
90, 0, 0 )

    font = FXFont.new( app, "courier new", 16 )

    @someText = "Ruby tuesday..."
    @selected = FXDataTarget.new( @someText.size )

    @field = FXTextField.new( self, @someText.size+3, nil, 0,
JUSTIFY_RIGHT | FRAME_SUNKEN | LAYOUT_SIDE_TOP )
    @field.setText( @someText )
    @field.disable
    @field.setFont( font )

    @slide = FXSlider.new( self, @selected, FXDataTarget::ID_VALUE,
LAYOUT_CENTER_Y | LAYOUT_FIX_WIDTH, 0, 0, 250 )
    @slide.setRange( 1, @someText.size )
  end


  def FXDataTargetExample.run
    application = FXApp.new( "Yet another Example" )

    application.init( ARGV )
    main = FXDataTargetExample.new( application )

    application.create()
    main.show( PLACEMENT_SCREEN )

    application.run()
  end

end

if __FILE__ == $0
  FXDataTargetExample.run
end
</code>


I'd like to manipulate the displayed text, say put the @selected-th char
in @someText in brackets...

So after the program starts 

    Ruby tuesday..[.]

is displayed in @field. And if the slide is moved to the leftmost
position you'd see:

    [R]uby tuesday...


How would I accomplish this?!

Thanks for any help & happy rubying!

Stephan