gdx_listener_hack.rb

## jruby-users question "Overriding A Method For A Specific Instance" -  
####### See: http://markmail.org/thread/emm5h6psqi4z3leq
##
#### Start this with  jruby -rgdx.jar gdx_listener_hack.rb   
###
#### where gdx is coming from http://libgdx.badlogicgames.com/releases/libgdx-1.0.1.zip

java_import "com.badlogic.gdx.scenes.scene2d.InputListener"

############### from email:
def listener_for(method, &block)
  Class.new(InputListener) do
    define_method(method, &block)
    def initialize(mgr)
      super()
      @mgr = mgr
    end

    def create_method(name, &inner_block)
      self.class.send(:define_method, name, &inner_block)
    end
  end.new(@mgr)
end

@inv_listener = listener_for(:touchDown) do |event, x, y, pointer,
  button|
  puts "starboard"
  true
end


@inv_listener.create_method(:touchUp) do |event, x, y, pointer,button|
  puts "stankboard"
  true
end

#  I can see that the method is being created by calling it:

#### Testing

puts "Calling touchUp..."
@inv_listener.touchUp(nil,nil)

puts "Calling touchDown..."
@inv_listener.touchDown(nil,nil)