Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!kth.se!draken!krona
From: krona@nada.kth.se (Kjell Krona)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: A pop-up background field ?
Keywords: HyperCard, background fields
Message-ID: <3221@draken.nada.kth.se>
Date: 27 Mar 90 23:22:20 GMT
References: <1990Mar27.173252.21738@uwasa.fi>
Reply-To: krona@nada.kth.se (Kjell Krona)
Organization: Royal Institute of Technology, Stockholm, Sweden
Lines: 40

> I would like to have a pop-up background field with text in it, to
> be used anywhere in the stack.

One solution I have been using is to store the text in a global
variable, and put it into the field when needed. Of course, if the
text is not removed afterwards, it will eventually be stored on all
cards. This can be easily accomplished with "opencard" and "closecard"
handlers. If we assume that the field pops up by special action, we
might write:

on openStack
        global theHiddenText
	put field "Hidden text" into theHiddenText
	-- We assume that the text is stored on a hidden field
	-- on the first card
end openStack

on popUp
	global theHiddenText
	show field "Hidden text"
	put theHidddenText into field "Hidden text"
end popUp

on closeCard
	put empty into field "Hidden text"
end closeCard

on openCard
	global theHiddenText
	if the visible of field "Hidden text" is true then
		put theHiddenText into field "Hidden Text"
	end if
end openCard

I am writing this from the heart :-), so there may be errors in
the scripts. I have used such techniques sucessfully, however.
Hopes this helps!

Kjell Krona   krona@nada.kth.se
Dept. of Architecture/Dept. of Numerical Analysis and Computer Science
Royal Institute of Technology, Stockhom, Sweden