Removing JavaFX TreeCell formating added with PseudoClass - css

Question

I am using a PseudoClass to change the formating of a JavaFx TreeCell depending on a condition given by the data in the tree cell. The following code works:
public class EmfTreeCellImpl extends TreeCell<EmfTreeNode> {
PseudoClass AMBIGUOUS_FEATURE = PseudoClass.getPseudoClass("ambiguous-feature");
public EmfTreeCellImpl() {
}
#Override
protected void updateItem(EmfTreeNode item, boolean empty) {
super.updateItem(item, empty);
if (empty || item == null) {
setText(null);
setGraphic(null);
return;
}
setText(item.getLabel());
setEditable(false);
if (item instanceof EmfTreeNode.SingleAttributeNode) {
EmfTreeNode.SingleAttributeNode san = (EmfTreeNode.SingleAttributeNode) item;
//pseudoClassStateChanged(AMBIGUOUS_FEATURE, san.isAmbiguous());
pseudoClassStateChanged(AMBIGUOUS_FEATURE, san.isAmbiguous());
}
}
}
The cells get highlighted correctly. The issue is that the highlight is "persisted" in the specific tree cell in the GUI. That is, if I collapse or expand other tree branches the highlight stays "in place" highlighting other cells that do not meet the condition. I thought the setGraphic(null) would remove the formatting.
To solve this I added an extra line to the updateItem to clear the formatting:
if (empty || item == null) {
setText(null);
setGraphic(null);
pseudoClassStateChanged(AMBIGUOUS_FEATURE, false);
return;
}
But somehow it feels I should only be either removing the format from the ones that have been formatted or using a more "global" clear.

Answer 1

As stated in the comments, the solution proposed in the answer itself is perfectly valid, however a more concise way of handling it may be making use of the built-in filled pseudo-class of Cell which is applied automatically to any non-empty cell:
:filled:ambiguous-feature {
/* css-styling of non-empty ambiguous cells */
}