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

Hi, i have a window with multiple frames. Once the user presses the delete button in the frame, i need to delete it and leave the remaining. For some reason i can't get the correct id. I know it can be deleted like: frame[0] -> destroy; but not based on the button pushed. Thanks for the help. 
#!/usr/bin/perl -wd

use Tk;

$main = MainWindow->new();

# Container frame for dynamic subframes
$fmain = $main->Frame(-borderwidth=>0)->pack(-side=>'top',-fill=>'both
+');

# Dymanic subframes
for ($a=0;$a<=1;$a++) {
$frame[$a] = $fmain->Frame(-borderwidth => 0)->pack(-side=>'left');
$frame[$a] -> Label(-text => "Frame " . \$whichframe[$a] ) -> pack;
$frame[$a] -> Button(-text => "Delete frame", -command => \&rmv ) -> p
+ack;
}

MainLoop;

sub rmv {
#Need to delete the frame here.

}

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Replies are listed 'Best First'.
Re: Multiple frames
by choroba (Cardinal) on Aug 26, 2013 at 07:37 UTC
    When creating the button, you know what frame to delete. There are two ways how to pass parameters to callbacks: you can use a closure or use an array reference: 
    # Closure - BROKEN!
$frame[$a] -> Button(-text => "Delete frame", -command => sub { rmv( $
+frame[$a]) })->pack;
# Array ref
$frame[$a] -> Button(-text => "Delete frame", -command => [   \&rmv, $
+frame[$a] ] )->pack;
}

sub rmv {
    shift->destroy;
}

    [download]

    Update: Oops, closures do not work for global arrays. Fix: 

    for (0 .. 5) {
    my $frame = $fmain->Frame(-borderwidth => 0)->pack(-side => 'left'
+);
    $frame->Label( -text => "Frame " . \$whichframe[$_] )->pack;
    $frame->Button(-text => "Delete frame",
                   -command => sub { rmv($frame) },
                  )->pack;
}

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    لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ
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      Thank you!
[reply]
        ok, so now i have added an entry widget to all the frames and using an array to store the values. it is always empty. 
        #!/usr/bin/perl -d
use Tk;

$fmain = MainWindow -> new;
$fmain -> title("Frame delete test");
@mycolor = qw(red green blue violet yellow black);

for ( 0 .. 5 ) {
 my $frame = $fmain->Frame(-borderwidth => 10, -relief => 'groove', -b
+ackground => $mycolor[$_])
   ->pack(-side => 'top');

 $lbl = $frame -> Label( -text => "Enter username: " )
   ->pack;

 $ent = $frame -> Entry( -text => $username[$_] )
   ->pack;

 $btn = $frame -> Button(-text => "Delete frame # " . $_, -command =>
   sub {
        $val = $ent->cget('-text');
        rmv_frm($frame,$val); } )
   ->pack;
 }

 $ex = $fmain -> Button(-text => "Exit",-command => sub { exit } )
   -> pack;

MainLoop;

sub rmv_frm {

shift -> destroy;
#$val_ref = $ent->cget('-text');
#$val = $$val_ref;
$val = shift;
print "You entered: $val\n";

# if no frames exist, need to "withdraw" fmain.
$fmain -> withdraw if $fmain -> children == 0;

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