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From: roy@neptune.iex.com (Roy Cantu)
Newsgroups: comp.windows.x
Subject: Controlling Viewport scrollbars.
Message-ID: <roy.647556488@neptune>
Date: 9 Jul 90 20:48:08 GMT
Sender: news@iex.uucp (C News)
Distribution: comp
Organization: IEX Corporation
Lines: 24


The Viewport widget provides horizontal 
and vertical scrollbars to control its child.
I was wondering how the application may gain
control over these scrollbars.  Looking at
the Scrollbar widget, I see that the
user may set the callback function, specify
the thumb position, specify the length of
the thump etc.  

Is it possible to gain such control over my
Viewport scrollbars without the hassle of
implementing individual Scrollbar widgets?

In particular, I would like to be notified
when the user has moved a scrollbar thumb
and by how much.  Furthermore, I would like
to be able to move the thumb and scroll the 
Viewport text from *within* the application.
   
Any suggestions are appreciated.


roy