[Tcl-bugs] [ tktoolkit-Bugs-653895 ] Mac: scrollbar set:slider wrong

[<no...@so...>]

Bugs item #653895, was opened at 2002-12-14 15:57
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=112997&aid=653895&group_id=12997

Category: 16. [scrollbar]
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: Mac: scrollbar set:slider wrong 

Initial Comment:
On Tk-Aqua the scrollbar slider size and position is 
not corectly configured by the scrollbar set command.
Bug can be demonstrated by:

grid [scrollbar .s] -row 0 -column 0 -sticky ns
grid rowconfigure . 0 -weight 1
.s set .1 .9

the slider is positioned between ~.25 and ~.75

try
.s set .0001 .9999
-there is no way using set to make a slider that is 
longer than 0.5 the height of the scrollbar.

now try 
.s set .1 .99
.s set .01 .9

the slider jumps to the bottom then the top of the 
scroll bar.
 In the sources it appears that the middle of the 
scrollbar is being set to first_fraction/(first_fraction+1-
last_fraction), when it appears to me that it would be 
more appropriate to set the middle of the scrollbar to 
(first_fraction+last_fraction)/2

I'm not sure where the bug in the slider length comes 
in.

This may be a bug in the non-Aqua versions for the 
Mac as well.

-w...@ea...

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=112997&aid=653895&group_id=12997