MVC Loop : MVC Pattern « Design Pattern « Java





MVC Loop

MVC Loop
/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002. All rights
 * reserved. Software written by Ian F. Darwin and others. $Id: LICENSE,v 1.8
 * 2004/02/09 03:33:38 ian Exp $
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee cup"
 * logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

// Investigate if you can get into a loop with a Swing-based MVC app;
// in particular, if you do setSelectedIndex on a choice, does it
// generate a secondary event? Push the button and see!
// If it does, you must be careful to avoid event propagation loops.
// This example doesn't show it, but you can loop with other implementations.
// For example, if a changed() method updates the model's data.

import java.awt.Button;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JComboBox;
import javax.swing.JFrame;

public class MVCLoop {
  public static void main(String[] a) {
    Button b;
    final JComboBox ch;
    JFrame f = new JFrame("Testing");
    Container cp = f.getContentPane();
    cp.setLayout(new FlowLayout());

    b = new Button("Set");
    ch = new JComboBox();

    cp.add(b);
    b.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        int cur = ch.getSelectedIndex();
        int len = ch.getItemCount();
        cur++;
        cur %= len;
        ch.setSelectedIndex(cur);
      }
    });

    ch.addItem("En/ett");
    ch.addItem("Zwei");
    ch.addItem("Tres");
    ch.addItem("Four");
    ch.addItem("Funf");
    ch.addItem("Seis");
    ch.addItem("Siete");
    ch.addItem("Octo");
    cp.add(ch);
    ch.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        System.out.println(e);
      }
    });

    f.pack();
    f.setVisible(true);
  }
}



           
       










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