radiobutton3tcl

Usage

Overview

radiobutton widgets are used in groups to show or change a set of mutually-exclusive options. Radiobuttons are linked to a Tcl variable, and have an associated value; when a radiobutton is clicked, it sets the variable to its associated value. -class -compound -cursor -image -state -style -takefocus -text -textvariable -underline -width

Options

[-command command Command] A Tcl script to evaluate whenever the widget is invoked. [-value Value Value] The value to store in the associated -variable when the widget is selected. [-variable 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, 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.)

Keywords

widget, button, option