Creating a User Interface in JavaFX - JavaFX 8: A Definitive Guide to Building Desktop, Mobile, and Embedded Java Clients - page 39

Label titleLabel = new Label("title");
HBox titleBox = new HBox(titleLabel, titleTextField);
VBox contentBox = new VBox(
textStageX, textStageY, textStageW, textStageH, textStageF,
checkBoxResizable, checkBoxFullScreen,
titleBox, toBackButton, toFrontButton, closeButton);
contentBox.setLayoutX(30);
contentBox.setLayoutY(20);
contentBox.setSpacing(10);
rootGroup = new Group(blue, contentBox);
Scene scene = new Scene(rootGroup, 270, 370);
scene.setFill(Color.TRANSPARENT);
//when mouse button is pressed, save the initial position of screen
rootGroup.setOnMousePressed((MouseEvent me) -> {
dragAnchorX = me.getScreenX() - stageRef.getX();
dragAnchorY = me.getScreenY() - stageRef.getY();
});
//when screen is dragged, translate it accordingly
rootGroup.setOnMouseDragged((MouseEvent me) -> {
stageRef.setX(me.getScreenX() - dragAnchorX);
stageRef.setY(me.getScreenY() - dragAnchorY);
});
textStageX.textProperty().bind(new SimpleStringProperty("x: ")
.concat(stageRef.xProperty().asString()));
textStageY.textProperty().bind(new SimpleStringProperty("y: ")
.concat(stageRef.yProperty().asString()));
textStageW.textProperty().bind(new SimpleStringProperty("width: ")
.concat(stageRef.widthProperty().asString()));
textStageH.textProperty().bind(new SimpleStringProperty("height: ")
.concat(stageRef.heightProperty().asString()));
textStageF.textProperty().bind(new SimpleStringProperty("focused: ")
.concat(stageRef.focusedProperty().asString()));
stage.setResizable(true);
checkBoxResizable.selectedProperty()
.bindBidirectional(stage.resizableProperty());
checkBoxFullScreen.selectedProperty().addListener((ov, oldValue, newValue) -> {
stageRef.setFullScreen(checkBoxFullScreen.selectedProperty().getValue());
});
title.bind(titleTextField.textProperty());
stage.setScene(scene);
stage.titleProperty().bind(title);
stage.initStyle(stageStyle);
stage.setOnCloseRequest((WindowEvent we) -> {
System.out.println("Stage is closing");
});