Assigning a Callback
As
usual, use the -command option to assign a
callback for the widget. The callback is invoked every time the Scale
value is changed. If you change the value from 50 to 100 and the
Scale increment is 1, the callback will be invoked 50 times. The
callback is also called when the widget is created. My recommendation
is not to use -command unless you have a small
number of possible values.
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