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Re: EVENT_PRO [message #73773 is a reply to message #40935]

Mon, 29 November 2010 10:38

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

silje writes:

> Changing the names to something more meaningful shouldn't be any
> problem :) But it still feels like an easy solution. I also found this
> in a previous discussion
>
> "If you do use EVENT_PRO to assign an event handler for a top-level
> base being directly managed by XMANAGER, you will find exceedingly
> strange things going on in your widget program, if it works at all.
> Believe me, you don't want to do this. "
>
> http://www.dfanning.com/widget_tips/multiple_widgets.html
>
> Could you explain what you meant by that?

In the old days, a widget that was being directly managed
by XManager (ie, the widget ID used in the XManager call)
could not be assigned an event handler with either EVENT_PRO
or EVENT_FUNC keywords. Rather, you had to assign an
event handler to this widget with the EVENT_HANDLER keyword
to XManager.

I still follow this rule in my own widget programs because,
well ..., because I'm old school. :-)

I believe this requirement is no longer in effect, although
I haven't really tested it. I just see a lot of programs
written by ITTVIS that assign the top-level base an event
handler using the EVENT_PRO keyword. So I presume this
restriction is no longer valid.

You could test it and let me know. :-)

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]

		event_pro for compound widgets By: Benjamin Hornberger on Tue, 07 September 2004 10:32
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 11:40
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 11:09
		Re: EVENT_PRO By: silje on Mon, 29 November 2010 11:02
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 11:02
		Re: EVENT_PRO By: Paul Van Delst[1] on Mon, 29 November 2010 10:43
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 10:38
		Re: EVENT_PRO By: silje on Mon, 29 November 2010 09:22
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 08:46

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