class PositionPanel extends Panel with LayoutContainer {
  import PositionPanel._
  
  type Constraints = Seq[Tuple2[Property.PropertyValue, _ >: Double with Float with Int]]
  
  def layoutManager = peer.getLayout.asInstanceOf[PositionLayout]
  override lazy val peer = new javax.swing.JPanel(new PositionLayout) with SuperMixin
  
  def areValid(c: Constraints): (Boolean, String) = (true, "")
  
  def constraintsFor (comp: Component) = {
     var cs = layoutManager.getConstraints (comp.peer)
     var seq: Constraints = Nil
     cs foreach {
       c => seq = seq :+ (c.property, c.value)
     }
     seq
  }
  
  def add(c: Component, l: Constraints) {
    layoutManager.addLayoutComponent (c.peer, convertConstraints (convertConstraints (l)))
  }
}

object Test extends SimpleSwingApplication {
  val button1 = new Flex4Button

  def top = new MainFrame {
    title = "Test"
    preferredSize = new Dimension(860, 400)

    contents = new FlowPanel {
      background = Color.RED

      contents += button1

    }
  }

  def main: Unit = main(Array())
}

object PositionTest extends SimpleSwingApplication {
  val button2 = new Button("Button")
  
  val positionPanel = new PositionPanel {
    preferredSize = new Dimension(200, 200)
    background = Color.BLUE

    add(
      button2,
      Seq((PositionPanel.Property.Left, 10), (PositionPanel.Property.Right, 10)))
  }

  def top = new MainFrame {
    title = "Test"
    preferredSize = new Dimension(860, 400)

    contents = new FlowPanel {
      contents += positionPanel
    }

    positionPanel.revalidate

    println (this)
    println (contents(0))
    println (positionPanel)
  }
  def main: Unit = main(Array())
}