Re: [wxperl-users] Wx::ListCtrl, sorting

[Mattia B. <mb...@ds...>]

> hello
> i whish to sort my ListCtrlItems.
> the ListCtrl is in report mode.
> 
> i noticed the SortItems function, but it only sorts the items after the
> ItemData, not after the labels.
> is there a function/a way to sort the items after the text?
Not directly, see below

> if not, what would be a good/fast way do do this myself?
> think that's a very mathematically problem.
I don't kno how fast is what I am proposing, but here is goes:
(this is pseudo-code, I think is enough to get you started,
 I'll provide real-code if you so wish)

when inserting, construct an hash to map between item data and
the item index

my $data = 0; # this needs to be unique!
my %map;

foreach ( ... things to insert ... ) {
   my $item = INSERT_ITEM;

   # this provides at least 2 * 10^9 unique data identifiers,
   # should be enough
   $list->SetItemData( $item, ++$data );
   $map{$data} = $item;
}

When sorting, use the hash to map from the data to the index:
sub callback {
	my( $f, $s ) = @_;
    my( $i1, $i2 ) = ( $map{$f}, $map{$s} );

    # now you can use $i1, $i2 to retrieve the labels
    # and compare them
}

HTH
Mattia