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Re: perl tk bind callback

by converter (Priest)
on Oct 17, 2003 at 19:26 UTC ( #300117=note: print w/ replies, xml ) Need Help??

in reply to perl tk bind callback

You can create your own class derived from Tk::Label and override the configure method.

#!/usr/bin/perl use warnings; use strict; use Tk; { package Tk::MyLabel; use Tk::widgets('Label'); @Tk::MyLabel::ISA = 'Tk::Label'; Tk::Widget->Construct('MyLabel'); sub configure { my ($cw, %args) = @_; if (my $bg = $args{-background} || $args{-bg}) { print "changing background to: $bg\n"; } $cw->SUPER::configure(%args); } } my (@color, $color) = qw(blue green); my $mw = tkinit; $mw->packPropagate(0); my $lab = $mw->MyLabel( -text => "foo", -background => $color[0], )->pack; my $b = $mw->Button( -text => 'Do it!', -command => sub { $color = $color ? 0 : 1; $lab->configure(-background => $color[$color]); } )->pack; $mw->bind('<Control-q>', sub { Tk::exit(0) }); MainLoop;

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