What is the use of command set -- and set - variable? Post: 302479868

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LEARN ABOUT OSX

ttk_radiobutton

ttk::radiobutton(n)						 Tk Themed Widget					       ttk::radiobutton(n)

__________________________________________________________________________________________________________________________________________________

NAME

       ttk::radiobutton - Mutually exclusive option widget

SYNOPSIS

       ttk::radiobutton pathName ?options?
_________________________________________________________________

DESCRIPTION

       ttk::radiobutton  widgets are used in groups to show or change a set of mutually-exclusive options.  Radiobuttons are linked to a Tcl vari-
       able, and have an associated value; when a radiobutton is clicked, it sets the variable to its associated value.

STANDARD OPTIONS

       -class		     -compound		  -cursor
       -image		     -state		  -style
       -takefocus	     -text		  -textvariable
       -underline	     -width

       See the ttk_widget manual entry for details on the standard options.

WIDGET-SPECIFIC OPTIONS
       [-command command] A Tcl script to evaluate whenever the widget is invoked.  [-value Value] The value to store in the associated  -variable
       when  the  widget  is  selected.  [-variable variable] The name of a global variable whose value is linked to the widget.  Default value is
       ::selectedButton.

WIDGET COMMAND

       In addition to the standard cget, configure, identify, instate, and state commands, radiobuttons support the  following	additional  widget
       commands:

       pathname invoke
	      Sets the -variable to the -value, selects the widget, and evaluates the associated -command.  Returns the result of the -command, or
	      the empty string if no -command is specified.

WIDGET STATES

       The widget does not respond to user input if the disabled state is set.	The widget sets the selected state whenever the  linked  -variable
       is  set to the widget's -value, and clears it otherwise.  The widget sets the alternate state whenever the linked -variable is unset.  (The
       alternate state may be used to indicate a "tri-state" or "indeterminate" selection.)

SEE ALSO

       ttk::widget(n), ttk::checkbutton(n), radiobutton(n)

KEYWORDS

       widget, button, option

Tk									8.5						       ttk::radiobutton(n)