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/*
* Copyright (c) 1999, 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.
*/
/*
* @test
* @bug 4139900
* @summary height of combobox may differ
* @key headful
* @run main bug4139900
*/
import java.awt.Dimension;
import java.awt.Robot;
import java.awt.event.ActionListener;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class bug4139900 {
static JButton button;
static JFrame frame;
static JComboBox<String> comboBox;
static int initialHeight;
public static void main(String[] args) throws Exception {
try {
SwingUtilities.invokeAndWait(bug4139900::init);
test();
} finally {
SwingUtilities.invokeAndWait(() -> {
if (frame != null) {
frame.dispose();
}
});
}
}
private static void test() throws Exception {
Robot robot = new Robot();
robot.waitForIdle();
robot.delay(500);
SwingUtilities.invokeAndWait(() -> initialHeight = comboBox.getHeight());
for (int i = 0; i < 10; i++) {
SwingUtilities.invokeAndWait(() -> button.doClick());
robot.waitForIdle();
robot.delay(200);
SwingUtilities.invokeAndWait(() -> {
if (comboBox.getHeight() != initialHeight) {
throw new RuntimeException(
"Test failed: height differs from initial %d != %d"
.formatted(comboBox.getHeight(), initialHeight)
);
}
});
}
}
public static void init() {
frame = new JFrame("bug4139900");
DefaultComboBoxModel<String> model =
new DefaultComboBoxModel<>(new String[]{
"Coma Berenices",
"Triangulum",
"Camelopardis",
"Cassiopea"
});
comboBox = new JComboBox<>();
comboBox.setEditable(true);
button = new JButton("Add/Remove Items");
ActionListener actionListener = e -> {
if (comboBox.getModel() == model) {
comboBox.setModel(new DefaultComboBoxModel<>());
} else {
comboBox.setModel(model);
}
};
button.addActionListener(actionListener);
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(300, 100));
panel.add(comboBox);
panel.add(button);
frame.add(panel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
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