//  ShoppingListMIDlet.java  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com/

//  2007-09-24  This file was created.
//  2007-09-24  Last modification.

/*  This program shows how to use List objects.

*/


import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;


public class ShoppingListMIDlet extends MIDlet
                                implements  CommandListener
{
   Display  midlet_display  =  Display.getDisplay( this ) ;

   String[]  main_shopping_categories  =  { "Food & Drink",
                                            "Kitchen & Bathroom",
                                            "Previous Shopping List" } ;

   List  main_shopping_categories_list  =  new List( "SELECT SHOPPING CATEGORY",
                                                     List.IMPLICIT,
                                                     main_shopping_categories,
                                                     null ) ;

   String[]  food_and_drink_items  =  { "Potatoes", "Rice", "Coffee", "Bread",
                                        "Mineral water", "Non-alcoholic beer" };

   List  food_and_drink_list  =  new List( "SELECT FOOD AND DRINK",
                                           List.MULTIPLE,
                                           food_and_drink_items, null ) ;

   String[]  bathroom_items  =  { "Toilet paper", "Shampoo", "Liquid soap" } ;

   List  bathroom_items_list  =  new List( "SELECT ONE BATHROOM ITEM:",
                                           List.EXCLUSIVE,
                                           bathroom_items,
                                           null ) ;

   Command  done_command  =  new  Command( "Done", Command.SCREEN, 1 ) ;

   public ShoppingListMIDlet()
   {
      main_shopping_categories_list.setCommandListener( this ) ;

      food_and_drink_list.addCommand( done_command ) ;
      bathroom_items_list.addCommand( done_command ) ;

      food_and_drink_list.setCommandListener( this ) ;
      bathroom_items_list.setCommandListener( this ) ;
   }

   protected void startApp() throws MIDletStateChangeException
   {
      midlet_display.setCurrent( main_shopping_categories_list ) ;
   }

   protected void pauseApp()
   {
   }

   protected void destroyApp( boolean unconditional_destruction_required )
   {
   }


   public void commandAction( Command     given_command,
                              Displayable display_content )
   {
      if ( given_command    ==  List.SELECT_COMMAND  &&
           display_content  ==  main_shopping_categories_list )
      {
         midlet_display.setCurrent( food_and_drink_list ) ;
      }
      else if ( given_command    ==  done_command  &&
                display_content  ==  food_and_drink_list )
      {
         midlet_display.setCurrent( main_shopping_categories_list ) ;
      }
   }
}