1. File -> New Mainstack
2. Drag Little Arrows control onto card
3. Right-click object -> Properties Inspector
4. endValue := 511
5. lineInc := 1
6. Right-click object -> Edit Script
7. Enter handlers:
on scrollbarInc pos
put pos
end scrollbarInc
on scrollbarDec pos
put pos
end scrollbarDec
8. Apply
9. Click on little arrows, *nothing* happens as a result (except the
hilite/unhilite of the arrows)
10. Add handler:
on scrollbarDrag pos
put pos
end scrollbarDrag
11. Apply
12. Repeat step 9, now "0" is placed into the message box no matter
which button I press
13. Remove scrollbarInc and scrollbarDec handlers
14. Apply
15. Repeat step 12, same results
16. Change endValue to 512
17. Repeat step 13, now the value in the message box can be changed
to either 0 or 1.
18. Change endValue to 513
19. Repeat step 17, now 0, 1, and 2 are possible to obtain
and so on...
20. Replace scrollbarDrag handler with scrollbarInc and scrollbarDec
handlers (originals from above in message)
21. Apply
22. Repeat of step 9, with its results - absolutely no change to
message box (I even did a "put empty", and the value in the message
box is not changing).
This recipe was constructed under 2.7.1, but it is essentially the
exact behavior I was seeing under other versions of 2.7.x...
Searching bugzilla revealed the solution in the form of bug 2180:
the thumbSize of the scrollbar was 511.
23. set the thumbSize of scrollbar "Scrollbar" to 0
24. Repeat step 22 - same results, no change to message box
25. Repeat steps 10, 13, 14
26. Repeat step 9, same results as from step 9.
27. set the thumbSize of scrollbar "Scrollbar" to 1
28. Repeat step 9, same results...?
29. Checked properties, apparently setting the thumbSize to 0 sets
the lineInc to 0 as well.
30. set lineInc back to 1
31. Repeat step 9, results are now correct
32. Set the endValue to 511, and can only go to 510
33. Set the endValue to 512 (due to the thumbSize), now I have what I
wanted!
I'm going to attach this recipe to bug 2180 as a "clarification".
Thank you!
On Nov 18, 2006, at 12:06 AM, J. Landman Gay wrote:
Frank D. Engel, Jr. wrote:
I have a "Little Arrows" scrollbar I dragged out onto a card.
With Rev 2.7.1, 2.7.2, and 2.7.4, I am seeing this:
I want to be able to select over a range of 0 to 511, so I set
startValue to 0, endValue to 511, and the lineInc to 1.
When I try to use the arrows, the thumbPosition stays at 0!
Try checking the scrollbarInc and scrollbarDec messages, which
carry a position parameter. The thumbposition doesn't really change
on tiny scrollbars. I think that's because the length of the
scrollbar has to be bigger than the size of the thumb before it
changes.
--
Jacqueline Landman Gay | [EMAIL PROTECTED]
HyperActive Software | http://www.hyperactivesw.com
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