drag&drop in Ruby Shoes

Shoes.app :title => "Residuos" do
  @residuos = image "focos_ahorradores.jpg",
    :top => "50",
    :left => "50",
    :width => 50,
    :height => 50
  @basuras = image "funda_roja.jpg",
    :top => "100",
    :left => "100",
    :width => 50,
    :height => 50
    @residuos.click do
      @presionado=true
      @basuras.click do
      @presionado=false
      @residuos.clear
    end
  end
    motion do |left, top|
        @residuos.move(left, top) if @presionado
    end
end