// this version works with VJ++ 1.1 (Java 1.0)
import java.awt.*;

public class MenuListPV10 extends Frame
{
   public static void main(String[] argv)
   {
      Frame f = new MenuListPV10();
      f.resize(400, 200);
      f.show();
   } // main

   private void add(Component c, GridBagLayout gbl, GridBagConstraints gbc,
                    int x, int y, int w, int h)
   {
      gbc.gridx = x;
      gbc.gridy = y;
      gbc.gridwidth = w;
      gbc.gridheight = h;
      gbl.setConstraints(c, gbc);
      add(c);
   } // add

   public MenuListPV10()
   {
      setTitle("Menu List");
      GridBagLayout gbl = new GridBagLayout();
      setLayout(gbl);
      selector      = new CheckboxGroup();

      depositSaving = new Checkbox("Savings Deposit",selector,false);
      depositChecking = new Checkbox("Checking Deposit",selector,false);
      
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.fill = GridBagConstraints.NONE;
      gbc.anchor = GridBagConstraints.CENTER;
      gbc.weightx = 100;
      gbc.weighty = 100;
      add(depositSaving, gbl, gbc, 1, 0, 2, 1);
      add(depositChecking, gbl, gbc, 1, 1, 2, 1);

      value = new TextField(8);
      checkingText = new Label(checkingStr + initString, Label.RIGHT);
      savingText = new Label(savingStr + initString, Label.RIGHT);
      gbc.anchor = GridBagConstraints.SOUTH;
      gbc.weighty = 0;
      add(value, gbl, gbc, 0, 3, 3, 1);
      Panel p = new Panel();
      p.setLayout(new FlowLayout());
      p.add(checkingText);
      p.add(savingText);
      add(p,gbl,gbc,0,4,12,1);
//      add(checkingText, gbl, gbc, 0, 4, 12, 1);
//      add(savingText, gbl, gbc, 0, 5, 12, 1);

      savingValue = checkingValue = 0;
   }  // MenuListPV10
 
   public boolean handleEvent(Event evt)
   {
      if (evt.id == Event.WINDOW_DESTROY)
          System.exit(0);
      return super.handleEvent(evt);
   }  // handleEvent

  public boolean action(Event evt, Object arg)
  {
      String s;
      if (evt.target.equals(depositSaving))
      {
         s = value.getText();
	 if (s != null)
	 {
	     savingValue += Double.valueOf(s).doubleValue();
	     savingText.setText(savingStr + savingValue);
	 }
      }  // deposit into savings
      else if (evt.target.equals(depositChecking))
      {
         s = value.getText();
	 if (s != null)
	 {
	     checkingValue += Double.valueOf(s).doubleValue();
	     checkingText.setText(checkingStr + checkingValue);
	 }
      }
      savingText.show();
      checkingText.show();
      return super.action(evt,arg);
   } // action

   // instance variables
   private Checkbox depositSaving, 
                    depositChecking;
   private CheckboxGroup selector;
   private TextField value; 
   private Label checkingText, savingText;
   private double savingValue, checkingValue;
   private static String initString = "0.0";
   private static String savingStr  = "saving balance : ";
   private static String checkingStr  = "checking balance : ";
}  // end of class MenuList