// ModelView.java adapated by Dr. I. for CS 102 during Spring, 2003
// Simple view class for Model-View-Controller

import java.util.*;
import javax.swing.*;

public class ModelView extends JPanel implements Observer {

   // Model to observe
   private Model model;

   // JTextField for displaying Model data value
   private JTextField modelTextField = new JTextField(10);

   // view constructor
   public ModelView(Model observableModel) {
      model = observableModel;

      model.addObserver(this); 

      // make balanceTextField readonly
       modelTextField.setEditable( false );

      // lay out components
      add( new JLabel( "Value: " ) );
      add( modelTextField );

      updateDisplay();

   }

   // get Model for which this view is an Observer
   public Model getModel() {
      return model;
   }

   // update display with Model data value
   public void updateDisplay()
   {
      // set text in modelTextField
      modelTextField.setText("" + getModel().getValue());
   }

   // receive updates from Observable Model
   public void update( Observable observable, Object object )
   {
      updateDisplay();
   }

}