Hi tamaguchi,

Note that you don't have to pass the subroutine as an anonymous subroutine within a list reference.

That is to say, although it will work to do:

$mw->bind( '<Control-KeyPress-a>',   [sub {print "Button a has been pr
+essed\n"}] );
$mw->bind( '<Control-KeyRelease-a>', [sub {print "Button a has been re
+leased\n"}] );
[download]

One often specifies either a simple anonymous subroutine:

$mw->bind( '<Control-KeyPress-a>',   sub {print "Button a has been pre
+ssed\n"} );
$mw->bind( '<Control-KeyRelease-a>', sub {print "Button a has been rel
+eased\n"} );
[download]

or a simple anonymous list:

$mw->bind( '<Control-KeyPress-a>',   [ \&say_button_pressed,  "a" ]);
$mw->bind( '<Control-KeyRelease-a>', [ \&say_button_released, "a" ]);

# Unlikely to do it this way unless the following subroutines are
# longer, or likely to be called from multiple places...
#
sub say_button_pressed {
    printf "Button %s has been pressed\n", $_[0];
}
sub say_button_released {
    printf "Button %s has been released\n", $_[0];
}
[download]

I tend to use the former, an anonymous subroutine, when the code is brief and simple, whereas the latter is better when the subroutine is long and complex.

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