button scope problem?

scdtl_at_yahoo.com
Date: 02/27/05

  • Next message: Jeff Godfrey: "Re: button scope problem?" 
    Date: 27 Feb 2005 11:30:43 -0800

    My first post to this group. I am trying to do something that should be
    trivially simple, and it has cost me days of work with no results.

    I globally define 2 related arrays, one with names, and with a simple
    flag variable, containing 0 or 1. These are passed to a proc, in which
    they are 'upvar #0'ed. The proc defines a toplevel, and runs through a
    'for' loop, defining checkbuttons and packing them. Each checkbutton
    refers to an indexed 'name' array element for the '-text' option and to
    an indexed 'flag' array element for the '-variable' option. One
    checkbutton is defined outside the loop with "Done" as the text, and a
    global variable, which appears in a 'tkwait' statement following the
    loop. The proc then destroys the toplevel and exits.

    The problem is, the 'flag' array elements are never set by clicking the
    checkbuttons. I have tried different approaches to this, assuming that
    arrays were the problem, and using named local variables, etc., but
    absolutely nothing fixes the problem.

    The code per se works. I first placed the code in a standalone Tcl
    script for testing, and it worked without a hitch, displaying a list of
    named checkbuttons, accepting the checkbutton clicks, and accurately
    registering changes in a flag array. Once that code was moved to a
    proc, however, all hell broke loose.

    The Welch&Jones text indicates that a button variables should be
    globally scoped, but I believe that I have addressed that situation, to
    no avail.

    I am REALLY exasperated with spending so much time on such a trivial
    problem, and would appreciate some help with a solution.

  • Next message: Jeff Godfrey: "Re: button scope problem?"
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