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21.6. The Radiobutton Widget
Create a radiobutton with the Radiobutton method. A radiobutton has an indicator to the left of the label indicating whether the button is selected. It differs from a checkbutton in that only one button may be selected at a time. Each button in a group of radiobuttons uses the same variable specified with the -variable option; when selected, the button assigns that variable the value specified by the -value option.
$parentwidget->Radiobutton (options)
The standard configuration options that apply to Radiobutton are: -activeback-ground, -activeforeground, -anchor, -background, -bg, -bitmap, -borderwidth, -bd, -cursor, -disabledforeground, -font, -foreground, -fg, -height, -highlight-background, -highlightcolor, -highlightthickness, -image, -justify, -padx, -pady, -relief, -state, -underline, -width, and -wraplength.
Other options are:
- -command => callback
- Pointer to a function that will be called when the radiobutton is pressed.
- -indicatoron => boolean
- Determines whether to display the indicator. Default is on (1).
- -selectcolor => color
- Color of the indicator when the radiobutton is on.
- -selectimage => imgptr
- Defines the image to be displayed instead of text when the radiobutton is on. Ignored if -image is not used.
- -text => 'text'
- Defines the text string displayed in the radiobutton. See also -textvariable.
- -textvariable => \$variable
- Points to the variable containing text to be displayed in the radiobutton. Button text will change as $variable does.
- -value => value
- Sets $variable to the specified value when the radiobutton is selected. Default is 1.
- -variable => \$variable
- Associates the on/off value of the indicator with the specified variable.
21.6.1. Radiobutton Methods
In addition to configure and cget, the following methods are supported by Radiobutton:
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| 21.5. The Checkbutton Widget |  | 21.7. The Label Widget |
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