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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.



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