public SimpleItemListModel<T> setDisplayIconMapper(final Function<T, ImageParam> displayIconMapper) {
        if (displayIconMapper != null) {
            this.displayIconMapper = displayIconMapper;
            triggerChange(ChangeType.COMPLETE);
        }
        return this;
    }
Sets a apper providing an optional icon to visualize per item
main/src/main/java/cgeo/geocaching/ui/SimpleItemListModel.java