Static method that adds click and hover sounds to a Scene2D button.

AddSoundToButton.java

/** Adds a {@link ClickListener} to the given button that plays sounds. */
public static void addSoundToButton(Actor button, Sound sound) {
    button.addListener(new ClickListener() {
        @Override
        public void clicked(InputEvent event, float x, float y) {
            super.clicked(event, x, y);
            
            // Play click sound.
            sound.play();
        }

        @Override
        public void enter(InputEvent event, float x, float y, int pointer, Actor fromActor) {
            // Ignore if mouse was already over
            if(isOver()) return;

            super.enter(event, x, y, pointer, fromActor);

            // Ignore if mouse is not over
            if(!isOver()) return;

            // Ignore if fromActor is a child
            Actor actor = event.getListenerActor();
            Actor from = fromActor;
            while(from != null) {
                if(from == actor) return;
                from = from.getParent();
            }

            // Play hover sound
            sound.play();
        }
    });
}