Scala example source code file (RootPanel.scala)

This example Scala source code file (RootPanel.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

component, component, container, container, nil, nil, rootpanel, rootpanel, seq

The Scala RootPanel.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2007-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */



package scala.swing

/**
 * The root of a component hierarchy. Contains at most one component. 
 *
 * @see javax.swing.RootPaneContainer
 */
trait RootPanel extends Container { 
  def peer: java.awt.Component with javax.swing.RootPaneContainer
  
  /**
   * At most one component.
   */
  def contents: Seq[Component] = 
    if (peer.getContentPane.getComponentCount == 0) Nil
    else {
      val c = peer.getContentPane.getComponent(0).asInstanceOf[javax.swing.JComponent]
      List(UIElement.cachedWrapper[Component](c))
    }
  
  def contents_=(c: Component) {
    if (peer.getContentPane.getComponentCount > 0) {
      val old = peer.getContentPane.getComponent(0)
      peer.getContentPane.remove(old)
    }
    peer.getContentPane.add(c.peer)
  }
}