Source Code : Form Juggle

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Form Juggle

/*--------------------------------------------------
* FormJuggle.java
*
* Show how a Form component handles inserting and
* setting (replacing) Items
*
* Example from the book:     Core J2ME Technology
* Copyright John W. Muchow   http://www.CoreJ2ME.com
* You may use/modify for any non-commercial purpose
*-------------------------------------------------*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class FormJuggle extends MIDlet implements CommandListener
{
  private Display display;      // Reference to display object 
  private Form fmMain;          // The main form
  private Command cmInsert;     // Command to insert items
  private DateField dfDate;     // Display date
  private TextField tfSize;     // Product size
  private TextField tfQuantity; // Product quantity
  private int dateIndex;        // Index of dfDate 

  public FormJuggle()
  {
    display = Display.getDisplay(this);

    // Create the date and populate with current date
    dfDate = new DateField("", DateField.DATE);
    dfDate.setDate(new java.util.Date());

    // Define two textfields and two commands
    tfSize = new TextField("Size", "Large", 5, TextField.ANY); 
    tfQuantity = new TextField("Quantity:", "3", 2, TextField.NUMERIC); 
    cmInsert = new Command("Insert", Command.SCREEN, 1);

    // Create the form, add insert command
    fmMain = new Form("Form Stuff");
    fmMain.addCommand(cmInsert);
  
    // Append date to form & save index value where it was inserted
    dateIndex = fmMain.append(dfDate);

    // Capture events
    fmMain.setCommandListener(this);    
  }

  // Called by application manager to start the MIDlet.
  public void startApp()
  {
    display.setCurrent(fmMain);
  }

  public void pauseApp()
  { }
  
  public void destroyApp(boolean unconditional)
  { }

  public void commandAction(Command c, Displayable s)
  {
    if (c == cmInsert)
    {
      // One item on form, insert textfield prior to datefield
      if (fmMain.size() == 1)
      {
        fmMain.insert(dateIndex, tfQuantity);     
        dateIndex += 1;   // Date index has changed, update it
      }
      // If two items and last item is datefield, replace it
      else if (fmMain.size() == 2 && fmMain.get(1) == dfDate)
        fmMain.set(dateIndex, tfSize);
    }
  }
}





           
       

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