groups and background

[erik hansen]

 "J. Landman Gay" <jacque at hyperactivesw.com> wrote:


>> if the number of cds in this bg > 1then answer "I'm shared."
> without evoking the "background" concept?
> the number of cds to which group "foo" is attached.

Actually, my example does invoke the "background" concept by referring 
to "this bg". You can refer to any background; for example, "the number 
of cards in bg foo". The critical distinction is that if you want the 
number of cards that a group is placed on, you need to refer to the 
group as a background the way HyperCard does. Referring to a "group" 
assumes the referent is the card and you get back only the groups placed 
on the current card. Referring to "background" assumes the referent is 
the stack the way HyperCard does it. Though the groups themselves are 
the same objects either way, the point of reference changes depending on 
the terminology in the script.

====================

ah ha! 
so there IS a RunRev specific reason to use the the "background" concept.


erik at erikhansen.org    http://www.erikhansen.org


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