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 the same 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)

Other options are:

• -command => callback
• Pointer to a function that will be called when the radiobutton is pressed.
• -indicatoron => boolean
• Determines whether or not 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.

Radiobutton Methods

In addition to configure and cget, the following methods are supported by Radiobutton:

• deselect
• Deselects the button and sets the variable to the empty string.
• select
• Sets the radio button.
• flash
• Causes the button to flash from the normal to active state colors.
• invoke
• Selects the button and invokes the callback command as if the radiobutton were clicked.