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/*
* Copyright (c) 2022, 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 8218474
* @key headful
* @requires (os.family == "linux")
* @summary Verifies if combobox components are rendered correctly.
* @run main TestComboBoxComponentRendering
*/
import java.awt.Color;
import java.awt.Component;
import java.awt.image.BufferedImage;
import java.awt.Font;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestComboBoxComponentRendering {
private static JFrame frame;
private static JComboBox cb;
private static Robot robot;
public static void main(String[] args) throws Exception {
robot = new Robot();
robot.setAutoDelay(100);
for (UIManager.LookAndFeelInfo laf :
UIManager.getInstalledLookAndFeels()) {
if (!laf.getClassName().contains("MotifLookAndFeel") &&
!laf.getClassName().contains("MetalLookAndFeel")) {
System.out.println("Testing LAF: " + laf.getClassName());
SwingUtilities.invokeAndWait(() -> setLookAndFeel(laf));
doTesting(laf);
}
}
}
private static void setLookAndFeel(UIManager.LookAndFeelInfo laf) {
try {
UIManager.setLookAndFeel(laf.getClassName());
} catch (UnsupportedLookAndFeelException ignored) {
System.out.println("Unsupported LAF: " + laf.getClassName());
} catch (ClassNotFoundException | InstantiationException
| IllegalAccessException e) {
throw new RuntimeException(e);
}
}
private static void doTesting(UIManager.LookAndFeelInfo laf)
throws Exception {
try {
SwingUtilities.invokeAndWait(() -> {
createAndShowUI();
});
boolean passed = false;
robot.waitForIdle();
robot.delay(1000);
Point pt = cb.getLocationOnScreen();
BufferedImage img = robot.createScreenCapture(
new Rectangle(pt.x, pt.y, cb.getWidth(), cb.getHeight()));
for (int x = 20; x < img.getWidth()-20; ++x) {
for (int y = 20; y < img.getHeight()-20; ++y) {
if (img.getRGB(x,y) == Color.RED.getRGB()) {
passed = true;
break;
}
}
if (passed)
break;
}
if (passed) {
System.out.println("Passed");
} else {
ImageIO.write(img, "png",
new File("ComboBox.png"));
throw new RuntimeException("ComboBox components not rendered" +
" correctly for: " + laf.getClassName());
}
} finally {
SwingUtilities.invokeAndWait(() -> {
if (frame != null) {
frame.dispose();
}
});
}
}
private static void createAndShowUI() {
String[] petStrings = { "Bird", "Cat", "Dog", "Rabbit", "Pig" };
frame = new JFrame();
cb = new JComboBox(petStrings);
cb.setRenderer(new ComboBoxCustomRenderer());
frame.pack();
frame.add(cb);
frame.setSize(200,250);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
class ComboBoxCustomRenderer extends JLabel
implements ListCellRenderer {
public ComboBoxCustomRenderer() {
setFont(new Font("SansSerif", Font.BOLD, 32));
setOpaque(true);
setHorizontalAlignment(CENTER);
setVerticalAlignment(CENTER);
}
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
setText(value.toString());
setForeground(Color.RED);
return this;
}
}
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