Revised GameGUI to show new send/respond_to? support

revised_game_gui.rb

class GameGUI

   def initialize(repeater)
      @repeater = repeater
      @repeater.subscribe(self)
   end

   # When a player (color) clicks on board location
   # x,y we attempt a move by broadcasting it
   def on_click(color, x, y)
      # Our new messages have options hashes that allow us to include
      # any information for a given command. Also, note that commands are now
      # symbolic rather than strings.
      message = {
         command: :attempt_move,
         options: {
            color: color,
            x: x,
            y: y
         }
      }

      @repeater.broadcast(message)
   end
   
   # Each message that the class responds to is simply defined
   # as a method which contains the block to handle that event
   def accept_move(opts)
      draw_move(opts[:color], opts[:x], opts[:y])
   end
   
   def illegal_move(opts)
      alert_player("Illegal move", opts[:color])
   end
   
   # This is where the real draw code would go!
   def draw_move(color, x, y)
      puts "#{self.class} drew #{color} at (#{x},#{y})"
   end
   
   def alert_player(message, color)
      puts "#{self.class} ALERT #{color}: #{message}"
   end
   
end