Your cell factory’s updateItem(...)
needs to handle the case where the cell is empty. This will be exactly the scenario when an item is removed (or becomes empty because a node in the TreeView
was collapsed) and the cell that previously showed an item is reused as an empty cell:
public ListCell<T> call(final ListView<T> param) {
ListCell<T> cell = new ListCell<T>(){
@Override
protected void updateItem(final T persistentObject, final boolean empty) {
super.updateItem(persistentObject, empty);
if (empty) {
setText(null);
setGraphic(null);
} else {
// ... rest of your code.
}
}
}
return cell ;
}