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bind up and down keys in a tk listbox

by lepetitalbert (Abbot)
on Mar 02, 2007 at 14:32 UTC ( [id://602882]=perlquestion: print w/replies, xml ) Need Help??

lepetitalbert has asked for the wisdom of the Perl Monks concerning the following question:

Hello dear Monks,

I'm totally unable to bind the up and down keys to move in a tk listbox

I found a few examples but none of them worked.

This is a simple test script : 

use Tk;

my $mw = MainWindow -> new();

my $lb = $mw -> Scrolled("Listbox",

    -scrollbars=>'e' ,
    
) -> pack(

    -side => 'left' ,
    -fill => 'y'
);


foreach my $key ("a" , "b" , "c") {
    
    $lb -> insert( 'end', $key );

}

    $lb->activate ( 0 ) ;
    $lb->selectionSet ( 0 ) ;

$lb -> bind ('<Key-Down>', sub {print "haha\n"} );

$mw -> bind ('<Key-Up>', sub {print "\nblabla"} );


MainLoop;

[download]

It seems I have to bind the key to the main window and not to the listbox, is this right ?

Thanks for any help or example.

Have a nice day.

"There is only one good, namely knowledge, and only one evil, namely ignorance." Socrates

Replies are listed 'Best First'.
Re: bind up and down keys in a tk listbox
by reasonablekeith (Deacon) on Mar 02, 2007 at 15:01 UTC
    If you want the up/down keys to control the listbox then I think you need to manage the focus. Adding an explict call in your code as follows enables these keys. 
    foreach my $key ("a" , "b" , "c") {
    $lb -> insert( 'end', $key );
}
$lb->activate ( 0 ) ;
$lb->selectionSet ( 0 ) ;
$lb->focus();

    [download]
    I'm _far_ from being a Tk expert, so I'd advise you to check out Tk::Focus docs for yourself.
    ---
    my name's not Keith, and I'm not reasonable.
[reply]
[d/l]

      Thank you reasonablekeith, cannot belive I missed this :)

      Works perfect.

      Have a nice day.

      "There is only one good, namely knowledge, and only one evil, namely ignorance." Socrates
[reply]

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