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Re: The proper way of catching mouse button events from a draw widget? [message #50771]

Wed, 18 October 2006 09:04

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Allan Whiteford writes:

>> Well, presumably you heard that it can't be done. :-)
>>
>>
>
> I think it perhaps could be... almost:
>
> If we get the user subroutine to supply its own function name and a
> magical index to the draw widget event handler then store all it's
> variables before returning.
>
> After the draw widget has collected the min and max x-range it can use a
> call_function to call back the original function which will take the
> index and essentially implement an entry point via a goto and then
> restore all the saved variables. It can then carry on with the min and
> max x-range.

A GOTO!? Your honor, I rest my case.

> However, my 'solution' is repulsive and there is no way I'm supplying
> example code for the above suggested catastrophe. One day far from now
> in a job interview someone might put it down in front of me and ask if I
> actually wrote it.

I'm certain we agree on this. -)

> I'm also of the opinion that if the above is the way to do it then it's
> almost indistinguishable from David's assertion that "it can't be done".

You are just trying to get on my good side, here.

> However if you're in the situation where you have code you can't
> refactor for whatever reason and using cursor is giving you the wrong
> answer then maybe it's easier (but certainly not better) than re-writing
> everything to function within how IDL is designed to do such things.

I'm not so sure, and anyway, he claimed that he wanted
to learn the "proper" way of doing this. This abomination
is certainly not that, IMHO. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: The proper way of catching mouse button events from a draw widget? By: David Fanning on Wed, 18 October 2006 09:04
		Re: The proper way of catching mouse button events from a draw widget? By: Allan Whiteford on Wed, 18 October 2006 08:54
		Re: The proper way of catching mouse button events from a draw widget? By: David Fanning on Wed, 18 October 2006 07:25
		Re: The proper way of catching mouse button events from a draw widget? By: Braedley on Wed, 18 October 2006 07:01
		Re: The proper way of catching mouse button events from a draw widget? By: Allan Whiteford on Wed, 18 October 2006 06:26
		Re: The proper way of catching mouse button events from a draw widget? By: David Fanning on Wed, 18 October 2006 05:49

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