| Tracking Events on Windows Platforms [message #9052] |
Fri, 30 May 1997 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Folks,
I reported an observation this morning about tracking events
on my WindowsNT machine being a bit unreliable. I've heard
from Mark Leaming, one of RSI's Windows developers, about the
situation. He has given me permission to post his reply to
this newsgroup.
He writes:
> Unlike MOTIF, Windows doesn't have a concept of "tracking" events
> rather Windows uses mouse click events to indicate a change of focus.
> We currently fake tracking events, but are constrained by lack of
> support in the windowing system. To support tracking the widgets
> currently respond to the WM_MOUSEMOVE and WM_NCMOUSEMOVE messages.
> When the mouse is moved quickly, these messages are not sent but
> rather compressed by the window system and you don't get the tracking
> event. There are other constraints imposed by the windowing system
> that currently limit our tracking support on windows.
> We have a design for fixing this but the work involved was too
> significant to get into 5.0 so it should be in the next release
> of IDL (5.1).
It ought to be fairly easy to work around this problem until
the fix is available. Thanks for the information, Mark.
Cheers,
David
----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
Customizable IDL Programming Courses
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com
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