http://www.perlmonks.org?node_id=932413


in reply to Tab Order for Widgets in HList

Not to hijack the thread, but I ran into some Tab troubles when trying to work on this problem. The code below is supposed to be a general purpose routine for defining focus order, but if you try it, it works for the Enter key, but not Tab! Can anyone enlighten me as to why Tab is hard coded to pass focus the way it does? 
#!/usr/bin/perl
use Tk;
use strict;
use warnings;

#changes focus on Return(Enter) key but not Tab

my $win = MainWindow->new();

 my $foo = $win->Entry->pack;
 my $bar = $win->Entry->pack;
 my $baz = $win->Entry->pack;
 my $boo = $win->Entry->pack;
 my $baa = $win->Entry->pack;

&defineOrder($foo,$baa,$bar,$boo,$baz);

sub defineOrder
{
    my $widget;
    for (my $i=0; defined( $_[$i+1] ); $i++)
    {
      $_[$i]->bind('<Key-Return>', [\&focus, $_[$i+1]]);
      
      
      # won't work with Tab
      $_[$i]->bind('all', '<Tab>', [\&focus, $_[$i+1]]);
    }

    # Uncomment this line if you want to wrap around
    $_[$#_]->bind('<Key-Return>',  [\&focus, $_[0]]);

    $_[0]->focus;
}

sub focus
{
    my ($tk, $self) = @_;
    $self->focus;
}

MainLoop();

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Replies are listed 'Best First'.
Re^2: Tab Order for Widgets in HList
by Anonymous Monk on Oct 19, 2011 at 14:59 UTC

    I'm not sure what is going on, but its something :)

    tab x 5, enter x 10

    Read more... (2 kB)
    
MainWindow=HASH(0xe911ac) bindtags ( MainWindow , . , all ,  )
Tk::Entry=HASH(0xed9414) bindtags ( Tk::Entry , .entry , . , all ,  )
Tk::Entry=HASH(0xed96b4) bindtags ( Tk::Entry , .entry4 , . , all ,  )
Tk::Entry=HASH(0xed95f4) bindtags ( Tk::Entry , .entry1 , . , all ,  )
Tk::Entry=HASH(0xed9664) bindtags ( Tk::Entry , .entry3 , . , all ,  )
Tk::Entry=HASH(0xed9644) bindtags ( Tk::Entry , .entry2 , . , all ,  )

MainWindow=HASH(0xe911ac) = $win
 Tk::Entry=HASH(0xed9414) = $foo
 Tk::Entry=HASH(0xed95f4) = $bar
 Tk::Entry=HASH(0xed9644) = $baz
 Tk::Entry=HASH(0xed9664) = $boo
 Tk::Entry=HASH(0xed96b4) = $baa
focus Tk::Entry=HASH(0xed9414) Tk::Entry=HASH(0xed9644)
focus Tk::Entry=HASH(0xed9644) Tk::Entry=HASH(0xed9644)
focus Tk::Entry=HASH(0xed9644) Tk::Entry=HASH(0xed9644)
focus Tk::Entry=HASH(0xed9644) Tk::Entry=HASH(0xed9644)
focus Tk::Entry=HASH(0xed9644) Tk::Entry=HASH(0xed9644)
focus Tk::Entry=HASH(0xed9644) Tk::Entry=HASH(0xed9414)
focus Tk::Entry=HASH(0xed9414) Tk::Entry=HASH(0xed96b4)
focus Tk::Entry=HASH(0xed96b4) Tk::Entry=HASH(0xed95f4)
focus Tk::Entry=HASH(0xed95f4) Tk::Entry=HASH(0xed9664)
focus Tk::Entry=HASH(0xed9664) Tk::Entry=HASH(0xed9644)
focus Tk::Entry=HASH(0xed9644) Tk::Entry=HASH(0xed9414)
focus Tk::Entry=HASH(0xed9414) Tk::Entry=HASH(0xed96b4)
focus Tk::Entry=HASH(0xed96b4) Tk::Entry=HASH(0xed95f4)
focus Tk::Entry=HASH(0xed95f4) Tk::Entry=HASH(0xed9664)
focus Tk::Entry=HASH(0xed9664) Tk::Entry=HASH(0xed9644)

    This works 

    sub defineOrder
{
    my $widget;
    for (my $i=0; defined( $_[$i+1] ); $i++)
    {
      $_[$i]->bind( '<Key-Return>', [\&focus, $_[$i+1]]);
      $_[$i]->bind( '<Tab>', [\&focus, $_[$i+1]]);
    }

    # Uncomment this line if you want to wrap around
    $_[ $#_ ]->bind('<Key-Return>',  [\&focus, $_[0]]);
    $_[ $#_ ]->bind('<Tab>',  [\&focus, $_[0]]);

    $_[0]->focus;
}

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    Using defineOrder($win, $foo,$baa,$bar,$boo,$baz); eliminates the need for the wraparound portion

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