Hello jsteng and welcome to the monastery and to the wonderful world of perl!
I tried a bit and it seems i get trouble first time I query one property: $lb->itemcget($sel, '-background') so I provide the initial value manually: my $current_color_bg = $lb->itemcget($sel, '-background') || 'yellow';
Here a working example flipping the colors:
use strict;
use warnings;
use Tk;
my $mw = MainWindow->new;
my %next_color=(red=>'yellow',yellow=>'red');
my $lb = $mw->Scrolled(
"Listbox",
-bg => 'yellow',
-fg => 'red',
-scrollbars => 'e',
)->pack;
$lb->insert('end', "Item1", "Item2", "Item3");
$lb->bind( '<Double-1>',
sub{
my $sel = $lb->curselection()->[0];
print "pressed $sel\n";
my $current_color_bg = $lb->itemcget($sel, '-background') || '
+yellow';
my $current_color_fg = $lb->itemcget($sel, '-foreground') || '
+red';
print "current color of the element $sel is $current_color_bg
+on $current_color_fg\n";
$lb->itemconfigure( $sel,
-background=> $next_color{$current_color_b
+g},
-fg=>$next_color{$current_color_fg}
);
}
);
MainLoop;
Double clicking the first entry 3 time and one time the second:
pressed 0
current color of the element 0 is yellow on red
pressed 0
current color of the element 0 is red on yellow
pressed 0
current color of the element 0 is yellow on red
pressed 1
current color of the element 1 is yellow on red
L*
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.
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