@Override
protected Object addValueIn(Control widget, PropertyDescriptor<?> desc, PropertySource source) {
int idx = ((Combo) widget).getSelectionIndex();
if (idx < 0) return null;
String newValue = ((Combo) widget).getItem(idx);
String[] currentValues = (String[]) valueFor(source, desc);
String[] newValues = CollectionUtil.addWithoutDuplicates(currentValues, newValue);
if (currentValues.length == newValues.length) return null;
source.setProperty((EnumeratedMultiProperty<?>) desc, newValues);
return newValue;
}
@Override
protected void update(PropertySource source, PropertyDescriptor<?> desc, List<Object> newValues) {
source.setProperty(
(EnumeratedMultiProperty<?>) desc, newValues.toArray(new String[newValues.size()]));
}
