A button that can be either selected or deselected, but when selecting it any other buttons in its group will be cleared.
capi
The class radio-button
inherits most of its behavior from button. Note that it is normally best to use a radio-button-panel rather than make the individual buttons yourself, as the button-panel provides functionality for handling groups of buttons. However, radio buttons are provided in case you need to have more control over the button's behavior.
(setq button (capi:contain (make-instance 'capi:radio-button :text "Press Me"))) (capi:apply-in-pane-process button #'(setf capi:button-selected) t button) (capi:apply-in-pane-process button #'(setf capi:button-selected) nil button) (capi:apply-in-pane-process button #'(setf capi:button-enabled) nil button) (capi:apply-in-pane-process button #'(setf capi:button-enabled) t button)
There is a further example here:
(example-edit-file "capi/buttons/buttons")
push-button
check-button
button-panel
radio-button-panel
3.10 Button elements
CAPI User Guide and Reference Manual (Macintosh version) - 01 Dec 2021 19:31:27