How to trigger event when double click on a tree node

Question

I have this code which creates new tab in a remote Java Class.
treeView.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<TreeItem<String>>()
   @Override
   public void changed(ObservableValue<? extends TreeItem<String>> observable, TreeItem<String> oldValue, TreeItem<String> newValue)
   System.out.println("Selected Text : " + newValue.getValue());
   // Create New Tab
   Tab tabdata = new Tab();
   Label tabALabel = new Label("Test");
  tabdata.setGraphic(tabALabel);
   DataStage.addNewTab(tabdata);
Can you tell me how I can modify the code to open new tab when I double click on a tree node. In my code the tab is opened when I click once. What event handler do I need?

Answer 1

import java.util.Arrays;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeView;
import javafx.scene.control.TreeItem;
import javafx.scene.control.SelectionMode;
import javafx.util.Callback;
public class TreeTest extends Application {
  public static void main(String[] args) {
    launch(args);
  @Override
  public void start(Stage primaryStage) throws Exception {
    primaryStage.setTitle("TreeView Test");
    primaryStage.setScene(createScene());
    primaryStage.show();
  private Scene createScene() {
    final StackPane stackPane = new StackPane();
    final TreeView<String> treeView = new TreeView<String>();
    treeView.setRoot(createModel());
    treeView.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);
    treeView.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>() {
      @Override
      public TreeCell<String> call(TreeView<String> treeView) {
        return new ClickableTreeCell();
    stackPane.getChildren().add(treeView);
    return new Scene(stackPane);
  private TreeItem<String> createModel() {
    TreeItem<String> root = new TreeItem<String>("RootNode");
    TreeItem<String> packageA = new TreeItem<String>("package A");
    packageA.getChildren().addAll(
        Arrays.asList(new TreeItem<String>("A1"), new TreeItem<String>("A2"), new TreeItem<String>("A3"))
    TreeItem<String> packageB = new TreeItem<String>("package B");
    packageB.getChildren().addAll(
        Arrays.asList(new TreeItem<String>("B1"), new TreeItem<String>("B2"), new TreeItem<String>("B3"))
    root.getChildren().addAll(Arrays.asList(packageA, packageB));
    return root;
  private class ClickableTreeCell extends TreeCell<String> {
    ClickableTreeCell() {
      setOnMouseClicked(new EventHandler<MouseEvent>() {
        @Override
        public void handle(MouseEvent event) {
          // Handle double-clicks on non-empty cells:
          if (event.getClickCount()==2 && ! isEmpty()) {
            System.out.println("Mouse double-clicked on: " + getItem());
    @Override
    protected void updateItem(String item, boolean empty) {
      super.updateItem(item, empty);
      if (empty) {
        setText(null);
      } else {
        setText(item);