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 $
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// 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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