/**
  * 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 2. Beispiel verbessert:
 * model und view kommunizieren ueber events
 * --> lose Kopplung
 * view kann ohne Aenderungen am model
 * ausgewechselt werden
 */

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

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

public
class ModelViewController2
  extends Applet
{
  Button control1, control2;

  Counter   model;

  ViewLabel view;
  ViewColor view2;

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

  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 ViewLabel();
    view2 = new ViewColor();

    model = new Counter();

    //--------------------
    // die grafischen Objekte anordnen
    setLayout(new GridLayout(4,1));

    add(control1);
    add(control2);
    add(view);
    add(view2);

    //--------------------
    // 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);
	 }
       }
      );
    //--------------------
    // view als event listener im model registrieren

    model.addCounterChangedListener(view);
    model.addCounterChangedListener(view2);

    // init event ausloesen
    model.incr(0);

  }
}