/**
  * Copyright (c): Uwe Schmidt, FH Wedel
  *
  * You may study, modify and distribute this source code
  * FOR NON-COMMERCIAL PURPOSES ONLY.
  * This copyright message has to remain unchanged.
  *
  * Note that this document is provided 'as is',
  * WITHOUT WARRANTY of any kind either expressed or implied.
  */

/* das 1. Beispiel verbessert:
 * der Controller ist von dem Rest sauber entkoppelt
 * aber model und view sind noch vermischt
 */

import java.applet.Applet;
import java.awt.Button;
import java.awt.Label;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

//--------------------

public
class ModelViewController1
  extends Applet
{
  Button control1, control2;

  Counter1 model;

  Label   view;

  //--------------------

  public
  void init() {

    //--------------------
    // die MVC Bestandteile initialisieren

    control1 = new Button("+1");
    control1.setBackground(Color.orange);

    control2 = new Button("-1");
    control2.setBackground(Color.pink);

    view = new Label();
    view.setAlignment(Label.CENTER);
    view.setBackground(Color.gray);
    view.setText("0");

    model = new Counter1(view);

    //--------------------
    // die grafischen Objekte anordnen
    setLayout(new GridLayout(3,1));

    add(control1);
    add(control2);
    add(view);

    //--------------------
    // die controller Ereignisse behandeln

    control1.addActionListener
      (new ActionListener()
       {
	 public
	 void actionPerformed(ActionEvent e) {
	   model.incr(+1);
	 }
       }
      );

    control2.addActionListener
      (new ActionListener()
       {
	 public
	 void actionPerformed(ActionEvent e) {
	   model.incr(-1);
	 }
       }
      );
  }

}

//--------------------

class Counter1 {
  int cnt;

  Label l;

  // die Sicht wird hier im Konstruktor gesetzt
  public
  Counter1(Label l) {
    this.cnt = 0;
    this.l   = l;
  }

  public
  void incr(int i) {
    cnt += i;

    // mitten im model eine Ausgabe !!!
    l.setText("" + cnt);
  }
}