Make JavaFX Button visually appear to be clicked on right click - swing

Question

I converted some old Java Swing code to JavaFX. The JavaFX code had explicit doClick() for the right mouse button calls:
myButton.addMouseListener(new MouseAdapter() {
#Override
public final void mousePressed(MouseEvent e) {
if (SwingUtilities.isLeftMouseButton(e)) {
// ...
}
else if (SwingUtilities.isRightMouseButton(e)) {
// ...
myButton.doClick();
}
}
});
Left clicks make the button visually appear to be clicked in Java Swing. However right clicks do not visually do this without adding myButton.doClick()
I am seeing the same visual behavior in JavaFX and I want right clicks to visually make the button look clicked. Below is my JavaFX code:
myButton.setOnMouseClicked(new EventHandler<MouseEvent>() {
#Override
public void handle(final MouseEvent event) {
if (event.getButton() == MouseButton.PRIMARY) {
// ...
}
else if (event.getButton() == MouseButton.SECONDARY) {
// ...
}
}
});
What do I have to add to make right clicks visually click myButton?

Answer 1

That visual appearance of button click is usually referred as "armed" pseudo state. So you can turn on/off the armed pseudo state of the button when doing right button pressed&released.
Something like..
myButton.setOnMousePressed(e->{
if(e.getButton()== MouseButton.SECONDARY){
myButton.pseudoClassStateChanged(PseudoClass.getPseudoClass("armed"), true);
}
});
myButton.setOnMouseReleased(e->{
if(e.getButton()== MouseButton.SECONDARY){
myButton.pseudoClassStateChanged(PseudoClass.getPseudoClass("armed"), false);
}
});

Answer 2

Updating the :armed pseudo class is not enough if you want the Button's action to be fired by a right click. You actually need to arm the Button. In other words, you need to make the armed property change to true. Also, updating the armed property will update the pseudo class for you.
As the armed property is read-only, you can't set it directly; you need to call arm() and disarm(). You may also need to manually call fire() (expanded on below). Here's an example:
Button button = new Button("Click Me!");
button.setOnAction(event -> System.out.println("Button clicked!"));
button.setOnMousePressed(event -> {
if (event.getButton() == MouseButton.SECONDARY) {
button.arm();
}
});
button.setOnMouseReleased(event -> {
if (button.isArmed()) {
button.disarm();
button.fire();
}
});
However, you don't appear to need the onMouseReleased handler at all—at least in JavaFX 11 and 12, using the default Button's skin/behavior. The Button's behavior class will fire the action if said Button is armed at the time the mouse is released (and no keys are down). Note that the default behavior class does a more complex check regarding which MouseButton was used (i.e. it does more then just check event.getButton() == MouseButton.PRIMARY). You can see the implementation for yourself here.
All that said, if you only want the visuals to change then you should use the approach shown in Sai's answer.