How to keep two checkbuttons in sync

ghosh123 has asked for the wisdom of the Perl Monks concerning the following question:

Hi
I have two checkbuttons (namely 'Main' and 'Top')in my perl tk application. One checkbutton is on the main gui and other is on a toplevel (popup) gui.
How can I keep both of them in sync

Following is the code:



use Tk;
my $mw = MainWindow->new ;
my ($m,$t);
$mw->geometry("100x100");
$mw->Checkbutton(-text => 'Main',-variable=>\$m)->pack(-side => 'left'
+);
$mw->Button(-text => 'popup', -command => sub {my $t = $mw->Toplevel()
+;$t->geometry("50x50");$t->Checkbutton(-text => 'Top',-variable => \$
+t)->pack(-side => 'left')})->pack();
MainLoop;
[download]

How can I keep 'Main' and 'Top' in sync. That means when 'top' is selected , 'Main' also gets selected and similarly when 'Top' is deselected
that makes also 'Main' deselected.

Comment on How to keep two checkbuttons in sync Download Code

Replies are listed 'Best First'.
Re: How to keep two checkbuttons in sync by Anonymous Monk on Mar 27, 2013 at 18:19 UTC
You've already got a -variable linked to one of the checkboxes. Why not link it to both?	[reply]
Re: How to keep two checkbuttons in sync by gurpreetsingh13 (Scribe) on Mar 28, 2013 at 03:29 UTC
Checkbutton manpage says: Name: offValue Class: Value Switch: -offvalue Specifies value to store in the button's associated variable whenever this button is deselected. Defaults to ``0''. Name: onValue Class: Value Switch: -onvalue Specifies value to store in the button's associated variable whenever this button is selected. Defaults to ``1''. As said by Anonymous monk, just link it to same variable and you are done: `$t->Checkbutton(-text => 'Top',-variable => \$m)->pack(-side => 'left' +)})->pack();` [download]	[reply] [d/l]