@Override
    public String toString(){
        String str = "MouseButton(BTN="+btnIndex;
        if (pressed) {
            return str + ", PRESSED)";
        } else {
            return str + ", RELEASED)";
        }
    }
The Y coordinate of the mouse when the event was generated.
@return Y coordinate of the mouse when the event was generated.
jme3-core/src/main/java/com/jme3/input/event/MouseButtonEvent.java