TransparentExample JavaFX

package edu.setht.fxtests;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.Background;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class TransparentExample extends Application{

    public static void main(String[] args) {
        launch(args);
    }

    public void start(Stage primaryStage) throws Exception {
        StackPane layout = new StackPane();
        Scene root = new Scene(layout, 480, 360);

        //BEGIN TRANSPARENT CODE

        //make the stage (window) transparent with no decorations
        //  alternatives include DECORATED, UNDECORATED, and UTILITY (and UNIFIED)
        //  http://aquafx-project.com/documentation.html   see <h3>Styling stage</h3>
        //  http://docs.oracle.com/javase/8/javafx/api/index.html?javafx/stage/StageStyle.html
        primaryStage.initStyle(StageStyle.TRANSPARENT);

        //set the scene's (container) fill to transparent
        //  it's looking for a Paint object but it seems to accept a Color object instead
        root.setFill(Color.TRANSPARENT);

        //finally, apparently the layout itself has a background we need to change
        //  remember that the layout is a child of the scene,
        //  unlike Swing where the layout manager contains the panel
        //  it seems you can do this with a css style method, but I'm not familiar with this yet
        //layout.setStyle("-fx-background-color: transparent;");
        //  so I'm using the setBackground() method instead
        layout.setBackground(Background.EMPTY);

        //you can't see the title anywhere, not even in the dock or taskbar
        //  so there's no real point in setting it
        primaryStage.setTitle("Transparent Window");
        primaryStage.setScene(root);
        primaryStage.show();

        Button button = new Button("I'm floating!");
        layout.getChildren().add(button);
    }

}