Mega Code Archive
Demonstrate Swing JList ListModel
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/*
* 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.
*/
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.util.ArrayList;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
import javax.swing.ListModel;
import javax.swing.event.ListDataListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
/**
* Demonstrate Swing "JList" ListModel
*
* @author Ian Darwin
* @author Tweaked by Jonathan Fuerth of SQLPower.ca
*/
public class JListModelDemo extends JListDemo {
JListModelDemo(String s) {
super(s);
ListModel lm = new StaticListModel();
list.setModel(lm);
list.setCellRenderer(new MyCellRenderer());
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static void main(String[] s) {
JListModelDemo l = new JListModelDemo("ListModel");
l.pack();
l.setVisible(true);
}
class MyCellRenderer extends JLabel implements ListCellRenderer {
/*
* Get the Renderer for a given List Cell. This is the only method
* defined by ListCellRenderer. If the object is already a component,
* keep it, else toString it and wrap it in a JLabel. Reconfigure the
* Component each time we're called to accord for whether it's selected
* or not.
*/
public Component getListCellRendererComponent(JList list, Object value, // value
// to
// display
int index, // cell index
boolean isSelected, // is the cell selected
boolean cellHasFocus) // the list and the cell have the focus
{
Component c = null;
if (value == null) {
c = new JLabel("(null)");
} else if (value instanceof Component) {
c = (Component) value;
} else {
c = new JLabel(value.toString());
}
if (isSelected) {
c.setBackground(list.getSelectionBackground());
c.setForeground(list.getSelectionForeground());
} else {
c.setBackground(list.getBackground());
c.setForeground(list.getForeground());
}
if (c instanceof JComponent) {
((JComponent) c).setOpaque(true);
}
return c;
}
}
class StaticListModel implements ListModel {
private final Object[] data = { "Hello", new Object(),
new java.util.Date(), new JLabel("Hello world!"), this, };
public Object getElementAt(int index) {
return data[index];
}
public int getSize() {
return data.length;
}
public void addListDataListener(ListDataListener ldl) {
// since the list never changes, we don't need this :-)
}
public void removeListDataListener(ListDataListener ldl) {
// since the list never changes, we don't need this :-)
}
}
}
class JListDemo extends JFrame {
JList list = null;
JListDemo(String s) {
super(s);
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
ArrayList data = new ArrayList();
data.add("Hi");
data.add("Hello");
data.add("Goodbye");
data.add("Adieu");
data.add("Adios");
list = new JList(data.toArray());
list.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent evt) {
if (evt.getValueIsAdjusting())
return;
System.out.println("Selected from " + evt.getFirstIndex()
+ " to " + evt.getLastIndex());
}
});
cp.add(list, BorderLayout.CENTER);
}
public static void main(String[] s) {
JListDemo l = new JListDemo("Greetings");
l.pack();
l.setVisible(true);
}
}
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