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Scala example source code file (BorderPanel.scala)

This example Scala source code file (BorderPanel.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

awt, borderpanel, borderpanel, component, component, constraints, constraints, east, panel, position, south, string, string, supermixin, west

The Scala BorderPanel.scala source code

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



package scala.swing

import java.awt.BorderLayout

object BorderPanel {
  /**
   * The position of a component in a <code>BorderPanel
   */
  object Position extends Enumeration {
    val North = Value(BorderLayout.NORTH)
    val South = Value(BorderLayout.SOUTH)
    val West = Value(BorderLayout.WEST)
    val East = Value(BorderLayout.EAST)
    val Center = Value(BorderLayout.CENTER)
  }
  private[swing] def wrapPosition(s: String): Position.Value = s match {
    case BorderLayout.NORTH => Position.North
    case BorderLayout.SOUTH => Position.South
    case BorderLayout.WEST => Position.West	
    case BorderLayout.EAST => Position.East
    case BorderLayout.CENTER => Position.Center
  }
}

/**
 * A container that arranges its children around a central component that 
 * takes most of the space. The other children are placed on one of four 
 * borders: north, east, south, west.
 * 
 * @see javax.swing.BorderLayout
 */
class BorderPanel extends Panel with LayoutContainer {
  import BorderPanel._
  def layoutManager = peer.getLayout.asInstanceOf[BorderLayout]
  override lazy val peer = new javax.swing.JPanel(new BorderLayout) with SuperMixin 
    
  type Constraints = Position.Value
  
  protected def constraintsFor(comp: Component) =
    wrapPosition(layoutManager.getConstraints(comp.peer).asInstanceOf[String])
  
  protected def areValid(c: Constraints): (Boolean, String) = (true, "")
  protected def add(c: Component, l: Constraints) {
    // we need to remove previous components with the same constraints as the new one, 
    // otherwise the layout manager loses track of the old one
    val old = layoutManager.getLayoutComponent(l.toString)
    if(old != null) peer.remove(old)
    peer.add(c.peer, l.toString)
  }
}

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