Re^2: Tk module subs executes without invocation

Magic. Thanks! That works. Can you explain why?

Also, another question: now that I ported all the subs from the script into a module the script reports:

Assuming require 'Tk::BrowseEntry' at FP_GUI.pm line 151;
Assuming require 'Tk::ProgressBar' at FP_GUI.pm line 169;
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Also something which it hasn't done before (this is despite a use Tk; statement at the beginning of the module and script). Why is that?

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Re^3: Tk module subs executes without invocation by Tanktalus (Canon) on Aug 29, 2005 at 16:28 UTC
You can only take a reference to a subroutine of some sort in perl5 (perl6 will have more sophisticated binding to allow you to pre-populate certain parameters and pass that code ref around instead of the original routine). So here what I'm doing is creating an anonymous sub that is also a closure - it's closed on $self, retaining the current value of $self at the time of this routine. It then calls the routine we want with the parameters we want - even though the Tk code can't know what $self is to pass it in. As to your assuming lines - I'm not sure, I'm not a Tk user. ;-)	[reply]

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Re^3: Tk module subs executes without invocation
by Tanktalus (Canon) on Aug 29, 2005 at 16:28 UTC

You can only take a reference to a subroutine of some sort in perl5 (perl6 will have more sophisticated binding to allow you to pre-populate certain parameters and pass that code ref around instead of the original routine). So here what I'm doing is creating an anonymous sub that is also a closure - it's closed on $self, retaining the current value of $self at the time of this routine. It then calls the routine we want with the parameters we want - even though the Tk code can't know what $self is to pass it in.

As to your assuming lines - I'm not sure, I'm not a Tk user. ;-)

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