gtk:single-selection-selected (object)

object -- a gtk:single-selection object
pos -- an unsigned integer for the item to select or the gtk:+invalid-list-position+ value

The accessor for the selected slot of the gtk:single-selection class gets or sets the position of the selected item. If no item is selected, the gtk:+invalid-list-position+ value is returned. The (setf gtk:single-selection-selected) function selects the item at the given pos.

If the list does not have an item at pos or the gtk:+invalid-list-position+ value is given, the behavior depends on the value of the autoselect property. If it is set, no change will occur and the old item will stay selected. If it is unset, the selection will be unset and no item will be selected.