1 import javax.swing._;

        2 

        3 class MenuBar extends JMenuBar with MenuHolder{

        4 

        5 }

        6 

        7 trait MenuHolder{

        8   def add(menu : JMenu) : JMenu;

        9 

       10   class Menu(name : String) extends JMenu(name) with MenuHolder{

       11     MenuHolder.this.add(this);

       12 

       13     def add(menu : JMenu) = add(menu : JMenuItem).asInstanceOf[JMenu]

       14 

       15     import java.awt.event._;

       16     class Item(name : String) extends JMenuItem(name){

       17       Menu.this.add(this);

       18       

       19       def does(performAction : => Unit) = {

       20         addActionListener(new ActionListener{

       21           def actionPerformed(e : ActionEvent) = performAction;

       22         });

       23         this

       24       }

       25     }

       26 

       27     class CheckboxItem(name : String) extends JCheckBoxMenuItem(name){

       28       Menu.this.add(this);

       29       def toggles(toggle : Boolean => Unit) = {

       30         addActionListener(new ActionListener{

       31           def actionPerformed(e : ActionEvent) = toggle(isSelected);

       32         });

       33         this

       34       } 

       35       def is (x : Boolean) = { setSelected(x); this}

       36     }

       37 

       38     implicit def item(name : String) = new Item(name);

       39     implicit def checkboxItem(name : String) = new CheckboxItem(name);

       40 

       41     def --- = add(new JSeparator()); 

       42   }

       43 }

       44 

       45 val frame = new JFrame(){

       46 }

       47 

       48 frame.setJMenuBar(new MenuBar{

       49   new Menu("File"){

       50     "Save" does { }

       51     "Open" does { }   

       52     ---

       53     "Quit" does { System.exit(0) }

       54   }

       55   new Menu("Edit"){

       56     "I like kitties" is true toggles (x => if(x) println("I like kitties") else println("I appear to be lying"))

       57     new Menu("A sub menu"){

       58       "There are no kitties in this submenu" does { }

       59     }

       60   }

       61 });

       62 

       63 frame.setSize(500, 500);

       64 frame.setVisible(true);