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Re: Scrolling text in a widget_label [message #78650 is a reply to message #78647]

Thu, 01 December 2011 15:32

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Russell writes:

> So, I did get it to do what I want, though I don't entirely understand
> why it works. It seems that widget_event(/nowait) returns the "bare
> bones" structure of {ID:0, TOP:0, HANDLER:0} for all times that the
> mouse is *inside* the widget. When you move out, it will add the tag
> "ENTER". So it was simple enough to test on whether or not the
> "ENTER" tag exists or not. I've attached a quick script to illustrate
> it. The first function is from the IDL astro-library maintained by W.
> Landsman --- just in case someone else is interested in this. I'm not
> sure it was worth all the time I spent on this, but it was a fun
> exercise! Now to figure out why widget_event changes its return
> structure like that, and whether or not I can trust this in the
> future....

Pretty neat! :-)

Just a word of warning, though. Tracking enter and exit
events is *extremely* fragile and operating system dependent.
It helps a great deal if you can train your users to move
their cursors v-e-r-y s-l-o-w-l-y.

I guess what I am saying is, this kind of thing works better
on your computer than it does on everyone else's. :-)

Cheers,

David

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

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[Message index]

		Re: Scrolling text in a widget_label By: Russell[1] on Fri, 02 December 2011 08:20
		Re: Scrolling text in a widget_label By: David Fanning on Thu, 01 December 2011 15:32
		Re: Scrolling text in a widget_label By: David Fanning on Thu, 01 December 2011 15:21
		Re: Scrolling text in a widget_label By: Russell[1] on Thu, 01 December 2011 14:59
		Re: Scrolling text in a widget_label By: David Fanning on Thu, 01 December 2011 12:56
		Re: Scrolling text in a widget_label By: Russell[1] on Fri, 09 December 2011 13:06

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