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From: roy@neptune.iex.com (Roy Cantu)
Newsgroups: comp.windows.x
Subject: Grabbing the AsciiWidget scrollbar. HELP.
Message-ID: <roy.648410020@neptune>
Date: 19 Jul 90 17:53:40 GMT
Sender: news@iex.uucp (USENET news)
Distribution: comp
Organization: IEX Corporation
Lines: 47


The Text widget allows for optional vertical and   
horizontal scrollbars.  It handles the callbacks
itself without bothering the user about scrollProcs
and jumpProcs.  This is all very nice as long as
the user is satisfied with what these scrollbars 
look like and do.

My application wants to "grab" these scrollbars
so that it may manipulate them while still taking
advantage of the Text widget and without having
to introduce any cumbersome ScrollbarWidgets.
I mean, who wants to write a jump and scroll Proc
when the Text widget already provides it?  
Specifically, my application would like to receive
events whenever the scrollbar is moved and sometimes
(not the majority of the time) set the scrollbar
thumb itself.  I tried to accomplish this with
the following (stripped down) function.

AsciiTextScroll(widget)
AsciiWidget	widget;
{
	Widget	v_bar;

	v_bar = XtNameToWidget(widget, "vScrollbar");
	XawScrollbarSetThumb(v_bar, 0.5, -1.0);
}

This looks good on paper to me, but when I check 
to see if v_bar has a value, it turns out to be
NULL.  Obviously not a good sign.  The inspiration
for the name to widget argument "vScrollbar" comes
from line 380 of Text.c.  I have also tried "vbar"
instead of "vScrollbar", but to no avail.     

Theoretically, if I ever can grab this vertical
scrollbar, I can set my own callback functions
when necessary and set them back to the Text
widget callbacks when I am done.  

Any suggestions or better ways of doing this will
be greatly appreciated.  I hate to keep bugging
people about this, but it is REALLY important.


roy cantu