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

public class EventEx2 extends MIDlet implements CommandListener {
   // display manager
   Display display = null;
    
   // a menu with items
   List menu = null; // main menu

   // list of choices
   List choose = null;

   // textbox
   TextBox input = null;

   // ticker
   Ticker ticker = new Ticker("Test GUI Components");

   // alerts
   final Alert soundAlert = new Alert("sound Alert");

   // date
   DateField date = new DateField("Today's date: ", DateField.DATE);

   // form
   Form form = new Form("Form for Stuff");
     
   // gauge
   Gauge gauge = new Gauge("Gauge Label", true, 10, 0);

   // text field
   TextField textfield = new TextField("TextField Label", "abc", 50, 0);

   // command
   static final Command backCommand = new Command("Back", Command.BACK, 0);
   static final Command mainMenuCommand = new Command("Main", Command.SCREEN, 1);
   static final Command exitCommand = new Command("Exit", Command.STOP, 2);
   String currentMenu = null;

   // constructor.
   public EventEx2() {
   }

   /**
    * Start the MIDlet by creating a list of items and associating the
    * exit command with it.
    */
   public void startApp() throws MIDletStateChangeException {
     display = Display.getDisplay(this);
     // open a db stock file

     menu = new List("Test Components", Choice.IMPLICIT);
     menu.append("Test TextBox", null);
     menu.append("Test List", null);
     menu.append("Test Alert", null);
     menu.append("Test Date", null);
     menu.append("Test Form", null);
     menu.addCommand(exitCommand);
     menu.setCommandListener(this);
     menu.setTicker(ticker);

     mainMenu();
   }

   public void pauseApp() {
     display = null;
     choose = null;
     menu = null;
     ticker = null;
     form = null;
     input = null;
     gauge = null;
     textfield = null;      
   }

   public void destroyApp(boolean unconditional) {
     notifyDestroyed();
   }

   // main menu
   void mainMenu() {
     display.setCurrent(menu);
     currentMenu = "Main"; 
   }

   /**
    * Test the TextBox component.
    */
   public void testTextBox() {
     input = new TextBox("Enter Some Text:", "", 5, TextField.ANY);
     input.setTicker(new Ticker("testTextBox"));
     input.addCommand(backCommand);
     input.setCommandListener(this);
     input.setString("");
     display.setCurrent(input);
     currentMenu = "input";
   }
   
   /**
    * Test the List component.
    */
   public void testList() {
      choose = new List("Choose Items", Choice.MULTIPLE);
      choose.setTicker(new Ticker("listTest"));
      choose.addCommand(backCommand);
      choose.setCommandListener(this);
      choose.append("Item 1", null);
      choose.append("Item 2", null);
      choose.append("Item 3", null);
      display.setCurrent(choose);
      currentMenu = "list"; 
   }

   /**
    * Test the Alert component.
    */
   public void testAlert() {
      soundAlert.setType(AlertType.ERROR);
      soundAlert.setString("** ERROR **");
      display.setCurrent(soundAlert);
   }

   /**
    * Test the DateField component.
    */
   public void testDate() {
      java.util.Date now = new java.util.Date();
      date.setDate(now);
      Form f = new Form("Today's date");
      f.append(date);
      f.addCommand(backCommand);
      f.setCommandListener(this);
      display.setCurrent(f);
      currentMenu = "date";
   }

   /**
    * Test the Form component.
    */
   public void testForm() {
      form.append(gauge);
      form.append(textfield);
      form.addCommand(backCommand);
      form.setCommandListener(this);
      display.setCurrent(form);
      currentMenu = "form";
   }

   /**
    * Handle events.
    */  
   public void commandAction(Command c, Displayable d) {
      String label = c.getLabel();
      if (label.equals("Exit")) {
         destroyApp(true);
      } else if (label.equals("Back")) {
         if(currentMenu.equals("list") || currentMenu.equals("input") || 
            currentMenu.equals("date") || currentMenu.equals("form")) {
            // go back to menu
            mainMenu();
         } 
      } else {
         List down = (List)display.getCurrent();
         switch(down.getSelectedIndex()) {
            case 0: testTextBox();break;
            case 1: testList();break;
            case 2: testAlert();break;
            case 3: testDate();break;
            case 4: testForm();break;
         }
      }
   }
}