Hello IB2017,

this is covered in the Tk::callbacks basically you can pass any arguments you want as in: -dropcommand => [\&accept_drop, $drop, $another, $more] and they arrive in the sub accept_drop in @_ as always.

The same can be accomplished with: 

[ \&subname, arg1,  arg2, ..]
# or 
[ sub { ... },arg1,  arg2, ..]

[download]

Note the [..] around sub and args: if more than one element is passed Tk will expect an anonymous array with the code reference as first element and arguments following.

Also note that the contents of the [..] are evaluated by perl when the callback is created.

PS see it in action:

perl -MTk -e "tkinit->Button(-text=>'print',-command=>[sub{print join'-',@_},1, 2,3])->pack;MainLoop"

L*

There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

In reply to Re: Calling subroutine with \& and passing variables by Discipulus
in thread Calling subrutine with \& and passing variables by IB2017

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