russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
112 lines
3.7 KiB
Java
112 lines
3.7 KiB
Java
/*
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* Copyright (c) 1998, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.awt.Robot;
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import javax.swing.DefaultComboBoxModel;
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import javax.swing.JComboBox;
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import javax.swing.JFrame;
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import javax.swing.JLabel;
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import javax.swing.JPanel;
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import javax.swing.SwingUtilities;
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import javax.swing.event.ListDataEvent;
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import javax.swing.event.ListDataListener;
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/*
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* @test
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* @bug 4180054
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* @summary Tests that DefaultComboBoxModel doesn't fire a "contents changed" unnecessarily
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* @key headful
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* @run main bug4180054
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*/
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public class bug4180054 {
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static JFrame frame;
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static JComboBox comboBox;
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static volatile int numberOfContentsChangedEvents = 0;
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public static void main(String[] args) throws Exception {
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try {
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Robot robot = new Robot();
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SwingUtilities.invokeAndWait(() -> createTestUI());
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robot.waitForIdle();
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robot.delay(250);
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// change selected index 3 times
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SwingUtilities.invokeAndWait(() -> {
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comboBox.setSelectedIndex(1);
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comboBox.setSelectedIndex(3);
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comboBox.setSelectedIndex(2);
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comboBox.setSelectedIndex(2);
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});
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robot.waitForIdle();
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robot.delay(250);
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if (numberOfContentsChangedEvents != 3) {
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throw new RuntimeException("Unexpected number of Contents Changed Events!\n" +
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"Expected: 3\nActual: " + numberOfContentsChangedEvents);
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}
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} finally {
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SwingUtilities.invokeAndWait(() -> {
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if (frame != null) {
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frame.dispose();
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}
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});
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}
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}
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public static void createTestUI() {
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frame = new JFrame("bug4180054");
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JPanel panel = new JPanel();
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JLabel label = new JLabel("0");
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DefaultComboBoxModel model = new DefaultComboBoxModel();
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for (int i = 0; i < 100; ++i) {
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model.addElement(Integer.toString(i));
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}
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comboBox = new JComboBox(model);
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comboBox.setEditable(true);
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ListDataListener contentsCounter = new ListDataListener() {
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public void contentsChanged(ListDataEvent e) {
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++numberOfContentsChangedEvents;
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label.setText(Integer.toString(numberOfContentsChangedEvents));
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}
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public void intervalAdded(ListDataEvent e) {
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}
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public void intervalRemoved(ListDataEvent e) {
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}
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};
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comboBox.getModel().addListDataListener(contentsCounter);
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panel.add(comboBox);
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panel.add(label);
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frame.add(panel);
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frame.pack();
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frame.setLocationRelativeTo(null);
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frame.setVisible(true);
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}
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}
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