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Re: IDL widgets: comments and questions [message #3829 is a reply to message #3752]

Fri, 17 March 1995 01:27

cannon
Messages: 1
Registered: March 1995

Junior Member

In article <3k7396$6qi@hermod.uio.no>, steinhh@amon.uio.no (Stein Vidar Hagfors Haugan) writes:
|>

|> If you set it up correctly using a tree structure, you only need
|> one widget ID in order to find your information no matter how complex
|> your application is. The places where you have a legitimate
|> need for that ID is inside the event handler (or routines called by the
|> event handler). And in the event handler, you do have EVENT.TOP
|> (and even EVENT.HANDLER/EVENT.ID!). This, in combination with structure
|> variables as UVALUES, removes any need for common blocks in order
|> to pass data anywhere.
|>
.... cut ....

I'm trying to adopt your philosophy, but how do you handle a function
which uses a widget to return a value (like the pickfile routine say,
which uses a common block)? You call the function which creates the
widgets and it is all fine until you want to exit, with the value you
want the function to return in a uvalue somewhere. But to exit you
have to destroy the widgets so control gets handed back to the function
which made them - and then it cant get at the uvalue any longer to return
the thing you want??

The only examples i've seen use common blocks, but is there any other way
round it?

Robert Cannon

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[Message index]

		IDL widgets: comments and questions By: knight on Tue, 14 March 1995 18:30
		Re: IDL widgets: comments and questions By: rep2857 on Mon, 20 March 1995 09:45
		Re: IDL widgets: comments and questions By: cannon on Fri, 17 March 1995 01:27
		Re: IDL widgets: comments and questions By: steinhh on Wed, 15 March 1995 08:05
		Re: IDL widgets: comments and questions By: Fergus Gallagher on Fri, 24 March 1995 01:52

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