Hi, I'm trying to get MouseWheel support for the TK::Scale widget in Windows working but I don't really understand how. The few examples I've found on the Net refer to other widgets and don't seem to work for me when trying to apply them to a Scale widget.

Here is my test code (mouse wheel is not working with this code on Windows):

#!/usr/bin/perl

use strict;
use warnings;

use Tk;

my $var=0;
my $incr=1;
my $mw=MainWindow->new();


my $scale=$mw->Scale(
        -variable     =>  \$var,
        -to           =>  -63,
        -from         =>  63,
        -resolution   =>  $incr,
        -tickinterval =>  0,
        -label        =>  '',
        -width        =>  10,
        -length       =>  150,
        -sliderlength =>  20,
        -borderwidth  =>  1,
        -highlightthickness => 0,
        -showvalue    =>  1,
        -orient       =>  'vertical'
)->pack(-padx=>50);

# Linux/Unix mouse wheel binding
$scale->bind('<Button-4>' => sub{$scale->set($var+$incr)});
$scale->bind('<Button-5>' => sub{$scale->set($var-$incr)});

# Windows mouse wheel binding (not working)
$scale->bind('<MouseWheel>' => [ sub { $_[0]->set($var+$incr*($_[1] / 
+120))}, Ev('D') ] );

MainLoop;

[download]

How do I get this working on Windows? (on Linux it works fine, the binding is sooo much easier)

In reply to Perl-Tk MouseWheel support for Scale by perltux

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