Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!amdahl!uunet!wucs1!wuphys!wugate!wuee1!jtw
From: jtw@wuee1.wustl.edu (Trent Wohlschlaeger)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: Are hidden cards possible?
Message-ID: <39@wuee1.wustl.edu>
Date: 30 Jan 89 18:21:52 GMT
References: <6@aulait.stanford.edu>
Reply-To: jtw@wuee1.UUCP (Trent Wohlschlaeger)
Distribution: usa
Organization: Washington University, St. Louis, MO
Lines: 38

In article <6@aulait.stanford.edu> swenson@isl.Stanford.EDU (Norman Swenson) writes:
>Is it possible to hide cards in a stack, so that the stack developer
>can access them (for copying, etc.) but not the user?

One of the ways I use for doing this is to make my 'hidden' cards with a
different background, and then make the scripts for my -> and <- buttons

on mouseUp
   go to next (prev) gard of this background
end mouseUp

This also works well for stacks that have no hidden information but
multiple backgrounds that get shuffled together because of sorting by
a (non-unique) field (of different backgrounds).

The price you pay for this is a (usually) unnoticable increase in the
delay between cards.

You can also trap the menu calls for moving between cards and/or check
the user level to selectively allow viewing, but this exercise is left
to the student.

The bottom line, though, is that if you can see it, a determined user can
find it.

Now my addition to the wish list:
  would it be possible to add a qualifier such as
     sort by field foo _of this background_
  or
     find 'bar' in field foo _of this background_
???

I understand the need to convert the field name into a number for speed's
sake, but can the same not be done with the background?

Thanks,

Trent