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Hi, the following handler:

on mouseUp
open Stack "SuchandSuch"
end mouseUp

...causes an error message, all of a sudden.

Any help/comments greatly appreciated, thank you.

Hi, my guess is that this me-newbie-Rev-twistup hasn't occured to many people at all, mainly because I'm sure the majority plan their stack/substack system well in advance (unlike me).

I've started the project from scratch, so fingers crossed things should work out this time,...

Hi, my mistake/misunderstanding all along...

I had put an on openStack handler in the main stack, and using a beep and answer test, realised that the openStack message applies to any substacks as well...I live and learn!

So a question please: How do I write an openStack handler just for the main stack only, ignoring all substacks?

(i.e on openStack "This Stack Only"
-- set global variables ,etc initial values only
--and other first time, only time, stuff for main stack only
-- without resorting to a preferences file
end openStack)

The above using openStack "Main stack only please!" doesn't seem to work and still runs when other substacks are opened.

Thank you!

OK, I think I've tracked it down what I need to use now:
start using and stackInUse should do the trick when I've experimented with them...I think....

Thank you for your interest anyhow. Best regards all.

Hi, if any newcomer to the Rev language (like me) encounters this prob and can't get start using and StackInUse to work (like I can't ), there's an easy workaround (perhaps not as refined, but it works!)

If you use on PreOpenStack, OpenStack or CloseStack in your main stack, in any other sub-stacks, put the matching handlers as empty, i.e

on preOpenStack

end preOpenStack

Hope that's useful for someone, sometime!