require 'Qt4'

class Emitter < Qt::Object
  signals :s1
  def emit_signal
    emit s1
  end
end

class Receiver < Qt::Object

  def slot1
    puts "SIGNAL RECEIVED"
  end

  slots :slot1
end

e = Emitter.new
r = Receiver.new

Qt::Object.connect e, SIGNAL(:s1), r, SLOT(:slot1)
e.emit_signal