|
/*
* 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);
}
}
|
