Transparent JFXPanel not forwarding events to components under it - swing

Question

I am trying to create a transparent JFXPanel over a swing based UI. The problem is events are not forwarded through the "transparent" sections the way they are for normal swing components. I included a simple example below. Note that there are 3 layers, swing, swing, then the jfxpanel. If you comment out the
addItemToLayeredPanel(panel, createFXOverlay(), 7);
you can click both buttons even though they have jpanel layered above the bottom one. (Just demonstrating the effect works in swing only doesn't work with JFXPanel)
public class Main {
public static void main(String[] args) {
JFrame frame = new JFrame();
JLayeredPane panel = new JLayeredPane();
JButton button = new JButton("Push me");
JPanel overlay = createOverlay();
addItemToLayeredPanel(panel, button, 5);
addItemToLayeredPanel(panel, overlay, 6);
addItemToLayeredPanel(panel, createFXOverlay(), 7);
frame.getContentPane().add(panel);
frame.setSize(500, 500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private static JPanel createOverlay() {
JPanel panel = new JPanel();
panel.add(new JButton("on top"));
panel.setOpaque(false);
return panel;
}
private static JFXPanel createFXOverlay() {
JFXPanel panel = new JFXPanel();
BorderPane root = new BorderPane();
root.setStyle("-fx-background-color:transparent;");
root.setCenter(new Button("root"));
Scene scene = new Scene(root);
scene.setFill(javafx.scene.paint.Color.TRANSPARENT);
panel.setScene(scene);
panel.setOpaque(false);
return panel;
}
private static void addItemToLayeredPanel(JLayeredPane panel, JComponent item, int layer) {
item.setBounds(0,0,500,500);
panel.add(item);
panel.setLayer(item, layer);
}
}
Ideas? I tried a couple of ways of forwarding the events (generically) to jcomponents underneath, but I was unable to get it to work. I did find a couple of similar questions, but no solutions here and here

Answer 1

When Swings tries to see if a mouse event goes thru, it uses the JComponent method
public boolean contains(int x, int y) {
return (ui != null) ? ui.contains(this, x, y) : super.contains(x, y);
}
The problem is that JFXPanel, unlike other Swing components, does not define a ui ComponentUI. Therefore, the check falls back to the super.contains(x,y), which returns true if a mouse event happens within the bounds of the object.
The solution is to use a class that extends JFXPanel and overrides the contains method:
public class MyJFXPanel extends JFXPanel{
#Override
public boolean contains(int x, int y) { return false; }
}
Where false can be replaced by a more sophisticated statement, such as a pixel transparency condition.
The mouse events will then be automatically forwarded to the element underneat the MyJFXPanel.