sierra_mtnview at sbcglobal.net
Tue Apr 21 15:14:35 CEST 2009
Thanks. The code I'm looking at, not mine, has the concept of an "after"
video event (it takes about 8 seconds) that added some confusion to
what the code does. I wasn't sure if the after_cancel wasn't related to
it and some Tk widget.
Jeff Epler wrote:
> after, after_idle, and after_cancel map to the 3 main forms of the tcl
> "after" command.
> This command is used to delay execution of the program or to execute
> a command in background sometime in the future. It has several forms,
> depending on the first argument to the command:
> after cancel id
> Cancels the execution of a delayed command that was previously
> scheduled. Id indicates which command should be canceled; it
> must have been the return value from a previous after command. If the
> command given by id has already been executed then the after cancel
> command has no effect.
> -- from http://www.tcl.tk/man/tcl8.4/TclCmd/after.htm
> One use of "after" is in autoscrolling or autorepeat. When the starting
> event is seen, the repeat is scheduled with "after". Each time the
> repeat runs, it schedules itself again with "after". When the ending
> event is seen, the repeat is cancelled with "after cancel". To do this,
> tue id returned by the last "after" is stored somewhere.
Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
All the neutrons, and protons in the human body occupy
a cube whose side is 5.52*10**-6 meters (tiny!). That
adds up to a 150 pound person. It's not a surprise that
we are mostly space. (Calculation by WTW)
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