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/*
* Copyright (c) 1998, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.awt.Robot;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;
/*
* @test
* @bug 4180054
* @summary Tests that DefaultComboBoxModel doesn't fire a "contents changed" unnecessarily
* @key headful
* @run main bug4180054
*/
public class bug4180054 {
static JFrame frame;
static JComboBox comboBox;
static volatile int numberOfContentsChangedEvents = 0;
public static void main(String[] args) throws Exception {
try {
Robot robot = new Robot();
SwingUtilities.invokeAndWait(() -> createTestUI());
robot.waitForIdle();
robot.delay(250);
// change selected index 3 times
SwingUtilities.invokeAndWait(() -> {
comboBox.setSelectedIndex(1);
comboBox.setSelectedIndex(3);
comboBox.setSelectedIndex(2);
comboBox.setSelectedIndex(2);
});
robot.waitForIdle();
robot.delay(250);
if (numberOfContentsChangedEvents != 3) {
throw new RuntimeException("Unexpected number of Contents Changed Events!\n" +
"Expected: 3\nActual: " + numberOfContentsChangedEvents);
}
} finally {
SwingUtilities.invokeAndWait(() -> {
if (frame != null) {
frame.dispose();
}
});
}
}
public static void createTestUI() {
frame = new JFrame("bug4180054");
JPanel panel = new JPanel();
JLabel label = new JLabel("0");
DefaultComboBoxModel model = new DefaultComboBoxModel();
for (int i = 0; i < 100; ++i) {
model.addElement(Integer.toString(i));
}
comboBox = new JComboBox(model);
comboBox.setEditable(true);
ListDataListener contentsCounter = new ListDataListener() {
public void contentsChanged(ListDataEvent e) {
++numberOfContentsChangedEvents;
label.setText(Integer.toString(numberOfContentsChangedEvents));
}
public void intervalAdded(ListDataEvent e) {
}
public void intervalRemoved(ListDataEvent e) {
}
};
comboBox.getModel().addListDataListener(contentsCounter);
panel.add(comboBox);
panel.add(label);
frame.add(panel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
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