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Re: Oddball Event Handling (Longer than it Ought to Be) [message #23036 is a reply to message #23035]

Sun, 31 December 2000 07:45

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Hi David--

Thanks for the cool description of you project.

Now, prepare to be lightly toasted :-)

> FUNCTION FindTLB, startID
>
> ; This function traces up the widget hierarchy to find the top-level base.
>
> FORWARD_FUNCTION FindTLB
> parent = Widget_Info(startID, /Parent)
> IF parent EQ 0 THEN RETURN, startID ELSE parent = FindTLB(parent)
> RETURN, parent
> END

I have no problem with recursion. In this case however it's not
really needed. For the book larnin' types, this is known as tail
recursion I believe, which is often easily optimized. I admit
recursion may help you conceptualize what's going on though. Wouldn't
the following code do the same thing?

parent = startid
while widget_info(parent, /parent) NE 0 do $
parent = widget_info(parent, /parent)

Craig

--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: Oddball Event Handling (Longer than it Ought to Be) By: John-David T. Smith on Tue, 02 January 2001 09:22
		Re: Oddball Event Handling (Longer than it Ought to Be) By: davidf on Sun, 31 December 2000 11:01
		Re: Oddball Event Handling (Longer than it Ought to Be) By: Craig Markwardt on Sun, 31 December 2000 07:45

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