[Tcl-bugs] [ tktoolkit-Bugs-779559 ] scale widget triggering on enter/leave events (LINUX only)

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Bugs item #779559, was opened at 2003-07-29 07:47
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Category: 15. [scale]
Group: 8.4.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Al Larson (speedboat)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: scale widget triggering on enter/leave events (LINUX only)

Initial Comment:

The following occurs on LINUX only. I tried many Linux 
systems with differing O/S versions. All failed. May be a 
compiler bug, but I'll report and see if anyone else has 
seen this problem.

With the -resolution parameter set to a decimal value 
(.1 for example) , the widget triggers and executes 
the  -command when the cursor enters and leaves the 
the slider area (and with tk_strictMotif set, the entire 
widget).

The problem appears to be that TkRoundToResolution() 
returns a value with digits way beyond the end of the 
specified resolution. Then when -configure events 
occur, this value is then rounded again producing a 
slightly different value, so the command is triggered, 
even though the event was a simple background change 
as the result of an Enter/Leave event.

My solution (HACK), was to use the "new" value 
calculated within TkRoundToResolution() within a dummy 
print statement. I have no idea why this removes the 
extra junk, but it does, and the results are that the 
scale widget works as it should.

I've attached a two line example which demonstrates 
the problem. When the example starts, things work as 
expected, but once the slider has been moved. Moving 
the cursor thru the slider area triggers the command.





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