Scala example source code file (Menu.scala)

This example Scala source code file (Menu.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, gui, jcheckboxmenuitem, jmenu, jmenubar, jmenuitem, jmenuitem, jradiobuttonmenuitem, menu, menubar, menubar, menuitem, menuitem, string, string, swing

The Scala Menu.scala source code

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

package scala.swing

import scala.collection.mutable
import javax.swing._

object MenuBar {
  case object NoMenuBar extends MenuBar
}

/**
 * A menu bar. Each window can contain at most one. Contains a number of menus.
 * 
 * @see javax.swing.JMenuBar
 */
class MenuBar extends Component with SequentialContainer.Wrapper {
  override lazy val peer: JMenuBar = new JMenuBar with SuperMixin
  
  def menus: mutable.Seq[Menu] = contents.filter(_.isInstanceOf[Menu]).map(_.asInstanceOf[Menu])
  
  // Not implemented by Swing
  //def helpMenu: Menu = UIElement.cachedWrapper(peer.getHelpMenu)
  //def helpMenu_=(m: Menu) { peer.setHelpMenu(m.peer) }
}

/**
 * A menu item that can be used in a menu.
 * 
 * @see javax.swing.JMenuItem
 */
class MenuItem(title0: String) extends AbstractButton {
  override lazy val peer: JMenuItem = new JMenuItem(title0)
  def this(a: Action) = {
    this("")
    action = a
  }
}

/**
 * A menu. Contains menu items. Being a menu item itself, menus can be nested.
 * 
 * @see javax.swing.JMenu
 */
class Menu(title0: String) extends MenuItem(title0) with SequentialContainer.Wrapper { self: Menu =>
  override lazy val peer: JMenu = new JMenu(title0)
}

/**
 * A menu item with a radio button.
 * 
 * @see javax.swing.JRadioButtonMenuItem
 */
class RadioMenuItem(title0: String) extends MenuItem(title0) {
  override lazy val peer: JRadioButtonMenuItem = new JRadioButtonMenuItem(title0)
}
/**
 * A menu item with a check box.
 * 
 * @see javax.swing.JCheckBoxMenuItem
 */
class CheckMenuItem(title0: String) extends MenuItem(title0) {
  override lazy val peer: JCheckBoxMenuItem = new JCheckBoxMenuItem(title0)
}