Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I don't really have a good grasp as to how to efficiently force the program to check every x seconds?
It turns out that $mw->after(1000, \&sub); works.. then just add that into the sub to repeat..

Hi, Tk::after is usually used for a one-shot delay. What you want is Tk::repeat. Try

my $repeater = $mw->repeat(1000, \&sub); .... $repeater->cancel; # when you want to stop it
and you will not need to repeatedly call Tk::after in your sub.

Here is a basic example:

#!/usr/bin/perl use Tk; use warnings; use strict; my $mw = MainWindow->new(title => "Timer"); my $elapsed_sec = 0; my $elapsed_sec_label = $mw->Label(-textvariable => \$elapsed_sec)->pa +ck(); my $repeater; # declare first so it can be accessed in the callback $mw->Button(-text => "reset", -command => sub { $elapsed_sec = 0; &repeater(); })->pack(); $mw->Button(-text => "exit", -command => sub { exit })->pack(); # start first run &repeater(); MainLoop; sub repeater{ #this is repeated every second, and you can put your is_playing here $repeater = $mw->repeat(1000 => sub { $elapsed_sec ++; if ($elapsed_sec > 4){ $repeater->cancel } } ); }

I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh

In reply to Re: TK Timed action by zentara
in thread TK Timed action by randor

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others browsing the Monastery: (7)
    As of 2018-01-22 13:34 GMT
    Find Nodes?
      Voting Booth?
      How did you see in the new year?

      Results (233 votes). Check out past polls.