• From: Michael J. Lew
• Subject: RE: sliderbug or me being stupid again...?
• Date: Wed, 28 Jul 2004 16:47:33 -0700At 6:39 PM -0400 28/7/04, Wouter wrote: Some weird behavior or am I doing something wrong?
recipe: A scrollbar, style set to scale/slider, start value 1, end value 10, show value true A button with the script:
on mouseUp put the thumbpos of sb 1 into tX repeat with i = 1 to tX put 0 into item i of tC end repeat put "thumbpos:" && tX && "output:" && tC end mouseUp
Try different positions of the slidebar. Look at the output with the thumb in the region just before the value shown changes.
No, not YOU being stupid, the slider is stupid. I have to admit that that alleged stupidity of the slider is my opinion and it is not shared by Scott Raney (see bug #347).
Set the numberformat of the slider to "0.00" and look at the results. You can get it to work how you might expect by using round(the thumbposition) in your script. But there is more to it...
Sliders and scrollbars are far more difficult to work with quantitatively than you might think. The pageIncrement property doesn't determine the increment obtained when you click on the grey bit, it is really the pageInc minus the lineInc. The default lineInc for a new slider object is set to 0 (you can't see it in the object properties inspector but you can query it or set it with the message box). However, it changes if you change the numberformat ("Value format") of the slider! Thus if you have a slider with the numberformat set to show some decimal places you will see that clicking in the grey area of the slider gives you a change of value that is LESS THAN the pageInc ("On bar click") value. Of course, how much less than the expected value depends on the particular numberformat. I find this situation to be awkward every time I try to use a scrollbar or slider object.
Thank you Michael for responding.
The real problem is the value passed.
For example let's say the sb has thumbpos 2.
At a certain point, if you trace the little handler in the debugger, you see the value 2 passed to the var tX used for the max amount of loops.
But the repeat is looping 3 times.
If you first put the thumbpos into a field and take the value form the field then it shows 2 and loops 2 times.
This means the value passed from the sb to the tX var is the trunc value and the value passed to the engine is the round value
Anyway I bugzilla'ed this one as I think if the numberformat is not set it should pass the value shown by the thumbpos as such.
<http://www.runrev.com/revolution/developers/bugdatabase/show_bug.cgi? id=1912>
Hope this is not stupid :-) Greetings, Wouter
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