Translate JMonkey Tutorial to JRuby

Question

I've got all the tutorials up to beginner #5 translated and working, but I don't know Java well enough to know how to port the lines:

private ActionListener actionListener = new ActionListener() {
  public void onAction(String name, boolean keyPressed, float tpf) {
    if (name.equals("Pause") && !keyPressed) {
      isRunning = !isRunning;
    }
  }
};

private AnalogListener analogListener = new AnalogListener() {
  public void onAnalog(String name, float value, float tpf) {
    ...
  }
}

How might this work?

Answer 1

Ah, found the answer. Turns out, they were anonymous inner classes. In JRuby, you can just create a class that implements the Java interface like so:

class RBActionListener
  # This is how you implement Java interfaces from JRuby
  include com.jme3.input.controls.ActionListener

  def initialize(&on_action)
    @on_action = on_action
  end

  def onAction(*args)
    @on_action.call(*args)
  end
end

class HelloJME3
  # blah blah blah code blah blah blah

  def register_keys
    # ...
    ac = RBActionListener.new {|name, pressed, tpf @running = !@running if name == "Pause" and !pressed}
    input_manager.add_listener(ac, "Pause")
  end
end