javafx treeTableView将子行标记为红色

import javafx.scene.control.TreeTableCell;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTableRow;
import javafx.scene.paint.Color;

public class RedTreeTableCell<S, T> extends TreeTableCell<S, T> {
    @Override
    protected void updateItem(T item, boolean empty) {
        super.updateItem(item, empty);
        
        if (empty || item == null) {
            setText(null);
            setGraphic(null);
            return;
        }
        
        TreeTableRow<S> treeTableRow = getTreeTableRow();
        if (treeTableRow != null && !treeTableRow.isEmpty() && treeTableRow.getTreeItem().getParent() != null) {
            setTextFill(Color.RED);
        } else {
            setTextFill(Color.BLACK);
        }
        
        setText(item.toString());
    }
}

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTableView;
import javafx.stage.Stage;

public class TreeTableViewExample extends Application {
    @Override
    public void start(Stage primaryStage) {
        TreeTableView<String> treeTableView = new TreeTableView<>();
        
        TreeTableColumn<String, String> column = new TreeTableColumn<>("Column");
        column.setCellValueFactory((TreeTableColumn.CellDataFeatures<String, String> param) -> param.getValue().getValue());
        column.setCellFactory(param -> new RedTreeTableCell<>());
        
        TreeItem<String> rootItem = new TreeItem<>("Root");
        TreeItem<String> childItem1 = new TreeItem<>("Child 1");
        TreeItem<String> childItem2 = new TreeItem<>("Child 2");
        rootItem.getChildren().addAll(childItem1, childItem2);
        
        treeTableView.setRoot(rootItem);
        treeTableView.getColumns().add(column);
        
        Scene scene = new Scene(treeTableView, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}