Folks-

I have realtime data streaming into my perl script, and I want to keep a sorted listbox of some element of this stream. The attached code shows a snippet of the first thing that jumped into my mind (that works), but I don't like the fact that if the user selects a listbox item, it is lost when the listbox is next updated.

Then I started fiddling with being able to tie the listbox to a perl list variable, but got hopelessly confused (and figured you'd loose the selection in this scenario as well).

Now I'm thinking that I'll have to do a binary-search-and-insert on the listbox, instead of my bull-in-the-china-shop method of removing, sorting, and restoring the whole list.

I feel like I'm missing something obvious... Any thoughts are much appreciated!

Thanks

-Craig 

use strict;
use Tk;

use Data::Dumper;

my @data = (qw( ccc eee ddd aaa aaa ccc ddd ddd bbb ddd eee ggg fff));
my %seen;

# Create & configure text widget...
my $top = MainWindow->new;
my $list = $top->Scrolled('Listbox')->
    pack(-side=>'right', -fill=>'both', -expand =>1);

my $ref;
$ref = $top->repeat(700, \&addItem);

sub addItem
{
    my $item = shift(@data);
    if(!$item) { $ref->cancel; return };
    print STDERR "$item\n";
    if(! $seen{$item}) {
        $list->delete(0, 'end');
        $list->insert('end', sort(keys(%seen)));
    }
    $seen{$item}++;
    print STDERR "SEEN DUMP:\n", Dumper(\%seen), "\n";
}

MainLoop();

[download]

In reply to Sorted Realtime Tk Listbox by cmv

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