in reply to Multiple frames

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;
}

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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

Replies are listed 'Best First'.
Re^2: Multiple frames
by delmejo (Initiate) on Aug 27, 2013 at 22:17 UTC
    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;

      [download]
[reply]
[d/l]
        **Better format** 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;


}

        [download]
[reply]
[d/l]
        Just wondering if anyone has an idea about this? Its driving me crazy. Thanks in advance.
[reply]
        Oops. I just re-read my post.. Sorry. I'm curious why I get an empty variable when I push the delete button. I use an array in the entry widget bc devices usually have different usernames. I know I'm not passing it correctly. I'm not sure how to reference the correct array after pushing the button.
[reply]

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