gtk:drop-down-header-factory (object)

object -- a gtk:drop-down widget
factory -- a gtk:list-item-factory object, or nil for none

Accessor of the header-factory slot of the gtk:drop-down class. The gtk:drop-down-header-factory function sets the factory that is currently used to create header widgets for the popup. The (setf drop-down-header-factory) function sets the factory.

Since 4.12