Path: utzoo!attcan!uunet!mcsun!ukc!harrier.ukc.ac.uk!rlh2
From: rlh2@ukc.ac.uk (Richard Hesketh)
Newsgroups: comp.windows.x
Subject: Re: How to force scroll position in Athena Viewport
Message-ID: <5204@harrier.ukc.ac.uk>
Date: 30 Jul 90 11:17:04 GMT
References: <1990Jul30.004715.2019@smsc.sony.com>
Reply-To: rlh2@ukc.ac.uk (Richard Hesketh)
Organization: Computing Lab, University of Kent at Canterbury, UK.
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In article <1990Jul30.004715.2019@smsc.sony.com> dce@smsc.sony.com (David Elliott) writes:
>I have a List inside of a Viewport, and I'll be automatically
>highlighting items, and I'd like to be able to set the scroll of the
>window so that the highlighted item and all items below it (within
>reason) are in view.

I've created a new widget class "Scrollable List" that does just this,
and jolly useful it is too.  It required a change to the viewport
to do the scrolling though (see below).

>It doesn't look like there's any way to set the scroll position
>of either of the Viewport scrollbars, or even to get the widgets
>themselves.

This is very true, unfortunately.  I wanted this and to use a different
scrollbar class that gives thumb-bar "ticks" and so I created my own.
Essentially the geometry management of the viewport disallows
any x or y movement of a child by a SetValues call.

>Does anyone know of a way to do this?

You have to get the viewport modified or create your own.

>                                       If not, does anyone know
>a reason why the Viewport widget shouldn't be modified to make it
>possible to get the scrollbar widgets?

I've got a patch for the Athena Viewport that allows you to change the
position of the child when the scrollbars are on (of course the thumbs
move as well).  It appears I haven't sent it off as a bug report, so I
will and if you send me mail I'll send you a copy as well.

>...David Elliott
>...dce@smsc.sony.com | ...!{uunet,mips}!sonyusa!dce

Richard Hesketh   :   @nsfnet-relay.ac.uk:rlh2@ukc.ac.uk
		  :   rlh2@ukc.ac.uk    ..!mcsun!ukc!rlh2
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