link="#009900" vlink="#007700" alink="#cc0000"> Teachpacks for How to Design Programs

Lkup GUI

The teachpack implements three functions:

  • control : -> symbol
    to read out the name that a user typed into the query field
  • view : (union string symbol) -> true
    to display its argument in the message panel
  • modelT = (button% event% -> true)
    connect : modelT -> true
    to connect a controller with the Check button
    displays frame
  • Example:

     (lambda (e b)
       (view (control))))
    This example simply mirrors what the user types in to the message field.