mjs@behemoth.genetics.wisc.edu (Mike Schmelzer) (04/02/91)
[ Background: I'm trying to get an Athena scrollbar to work. SunOS 4.1, X11R4. I have O'Reilly 4 & 5, Xt and Xaw docs as my guides. I have RTFM'ed and am still at a loss. My jumpProc works okay, but I can't seem to get the scrollProc to anything useful. About the only thing I can get the scrollProc to do is cast the call_data parameter into the correct number of pixels. Before I elaborate on the specific problem I'm having, maybe I should ask generally: How to you get an Athena scrollbar to work with Buttons 1 and 3? The xscroll example in the R4 distrib was unilluminating. Anyway, on to the problem at hand... ] Inside my XtNscrollProc callback procedure, named do_scroll(), I try to get the current value of the scrollbar's thumb: float old_top; float shown; Dimension width; n = 0; XtSetArg(args[n], XtNtop, &old_top); n++; XtSetArg(args[n], XtNwidth, &width); n++; XtSetArg(args[n], XtNshown, &shown); n++; XtGetValues(scrollbar, args, n); By this method, I can get correct values for "shown" and "width", but I'm not sure what's being put into "old_top". For old_top, I get a very small value which I assume is a garbage value. Using gdb, I see that old_top initially has the garbage value 3.02495e-40, and after XtGetValues(), it has 1.4013e-45, which gets read as zero by the program. I then went to my XtNjumpProc callback, do_thumb(), and set up the same XtGetValues() call. Again, garbage. Please help me! -- ==== Mike Schmelzer, UW Genetix, mjs@genetics.wisc.edu, (608)263-7459. === ========= Schmelzer's Law: You can have anything you don't want. ========= ================ "How can hatred uplift a race?" - 3rd Bass ==============
mjs@behemoth.genetics.wisc.edu (Mike Schmelzer) (04/03/91)
I solved my problem. A quick look at the source for the Athena scrollbar widget reveals that the proper name for the resource I want is XtNtopOfThumb and *not* XtNtop, which is an Edge type. The Xaw documentation had it right, but O'Reilly had it wrong. My scrollbar works "as advertised" now. Yay! Now all I have to do is get the scrollbar settings to affect another widget. I'm sure you'll be hearing from me soon :-) Sorry to trouble you. -- ==== Mike Schmelzer, UW Genetix, mjs@genetics.wisc.edu, (608)263-7459. === ========= Schmelzer's Law: You can have anything you don't want. ========= ================ "How can hatred uplift a race?" - 3rd Bass ==============