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From: battle@alphard.cs.utk.edu (David Battle)
Newsgroups: comp.windows.x
Subject: scrolling to a particular item
Summary: how to scroll a viewport so a certain child is visible?
Keywords: Athena widgets
Message-ID: <1559@utkcs2.cs.utk.edu>
Date: 5 Jan 90 20:59:56 GMT
Sender: news@utkcs2.cs.utk.edu
Reply-To: battle@alphard.cs.utk.edu (David Battle)
Organization: CS Dept -- University of TN, Knoxville
Lines: 44


I need an elegant way to scroll a viewport widget to a point where a particular
child widget will be visible.  The widget structure looks like the following:


+---------------------------viewport----------------------------+
|                                                               |
|    +----------------------form--------------------------+     |
|    |                                                    |     |
|    |  +-------------------form----------------------+   |     |
|    |  |                                             |   |     |
|    |  +---------------------------------------------+   |     |
|    |  +-------------------form----------------------+   |     |
|    |  |                                             |   |     |
|    |  +---------------------------------------------+   |     |
|    |  +-------------------form----------------------+   |     |
|    |  |                                             |   |     |
|    |  +---------------------------------------------+   |     |
|    |  +-------------------form----------------------+   |     |
|    |  |                                             |   |     |
|    |  +---------------------------------------------+   |     |
|    |  +-------------------form----------------------+   |     |
|    |  |                                             |   |     |
|    |  +---------------------------------------------+   |     |
|    |  +-------------------form----------------------+   |     |
|    |  |                                             |   |     |
|    |  +---------------------------------------------+   |     |
|    |  +-------------------form----------------------+   |     |
|    |  |                                             |   |     |
|    |  +---------------------------------------------+   |     |
|    |                        .                           |     |
|    |                        .                           |     |
|    |                        .                           |     |
|    +----------------------------------------------------+     |
|                                                               |
+---------------------------------------------------------------+

There are *many* of the smaller sub-forms, and the viewport is smaller than
the outer form widget.  What I want to be able to do is given a Widget
variable which represents one of the sub-forms, how can I make the viewport
scroll to a point where that widget will be visible?

						-David L. Battle
						 battle@battle.esd.ornl.gov