Is it possible to change the state of a Tk::Button widget based on a variable? I don't see where this is possible out of the box, but my initial thought was to create a timer that evaluates the value of a variable and configures the button based on the value of the variable. Any better ideas? The example below changes the button's state to active when $number equals 1 
use Tk;
my $number = 0;
my $mw = tkinit();
my $button = $mw->Button(-text => 'Button')->pack(-side => 'left');
my $label=$mw->Label(-textvariable=>\$number)->pack(-side=>'left');
my $timer = $mw->repeat(100, sub{
    $number = int(rand(5));
    if ( $number == 1 ){
        $button->configure(-state => 'normal');
    } else {
        $button->configure(-state => 'disabled');
    }
});
$mw->MainLoop();

[download]

In reply to Change the state of Tk::Button widget based on a variable? by coderama

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.