package scala.swingimport java.awt.Dimensionimport javax.swing._import javax.swing.event._object Swing {  protected[swing] def ifNull[A](o: Object, a: A): A = if(o eq null) a else o.asInstanceOf[A]  protected[swing] def toOption[A](o: Object): Option[A] = if(o eq null) None else Some(o.asInstanceOf[A])  protected[swing] def toNull[A>:Null<:AnyRef](a: Option[A]): A = if(a == None) null else a.get    implicit def block2Runnable(block: =>Unit): Runnable = new Runnable {    override def run = block  }  def ChangeListener(f: ChangeEvent => Unit) = new ChangeListener {    def stateChanged(e: ChangeEvent) { f(e) }  }    def Box(min: Dimension, pref: Dimension, max: Dimension) = new Component {    override lazy val peer = new javax.swing.Box.Filler(min, pref, max)   }  def HGlue = new Component {    override lazy val peer = javax.swing.Box.createHorizontalGlue.asInstanceOf[JComponent]  }  def VGlue = new Component {    override lazy val peer = javax.swing.Box.createVerticalGlue.asInstanceOf[JComponent]  }  def Glue = new Component {    override lazy val peer = javax.swing.Box.createGlue.asInstanceOf[JComponent]  }  def RigidBox(dim: Dimension) = new Component {    override lazy val peer = javax.swing.Box.createRigidArea(dim).asInstanceOf[JComponent]  }  def HStrut(width: Int) = new Component {    override lazy val peer = javax.swing.Box.createHorizontalStrut(width).asInstanceOf[JComponent]  }  def VStrut(height: Int) = new Component {    override lazy val peer = javax.swing.Box.createVerticalStrut(height).asInstanceOf[JComponent]  }}