5.7.1 Interaction

All choices have an interaction style, controlled by the :interaction initarg. The radio-button-panel and check-button-panel are simply button-panels with their interactions set appropriately. The possibile values for interaction are listed below.

:single-selection

Only one item may be selected at a time: selecting an item deselects any other selected item.

:multiple-selection

A multiple selection choice allows the user to select as many items as she wants. A selected item may be deselected by clicking on it again.

:extended-selection

An extended selection choice is a combination of the previous two: only one item may be selected, but the selection may be extended to more than one item.

:no-selection

Forces no interaction. Note that this option is not available for list panels. To display a list of items with no selection you should use a display pane instead.

Specifying an interaction style that is invalid for a particular choice causes a compilation error.

The accessor choice-interaction is provided for accessing the interaction of a choice .