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8283493: Create an automated regression test for RFE 4231298
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Backport-of: 6917c39e450e0564b8db7c96be132881a6b0a112
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GoeLin committed Aug 1, 2022
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/*
* Copyright (c) 2003, 2022, 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.Color;
import java.awt.Component;
import java.awt.Robot;
import java.util.Arrays;
import java.util.List;
import java.util.Vector;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.ListCellRenderer;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.UnsupportedLookAndFeelException;

import static javax.swing.UIManager.getInstalledLookAndFeels;

/*
* @test
* @key headful
* @bug 4231298
* @summary This testcase tests the RFE 4231298 request, JComboBox Custom
* Renderer should not be called for non displaying elements if
* setPrototypeDisplayValue() has been invoked.
* @run main JComboBoxPrototypeDisplayValueTest
*/
public class JComboBoxPrototypeDisplayValueTest {

private static Robot robot;
private static JFrame frame;
private static JComboBox buttonComboBox;
private static volatile int count;

public static void main(String[] args) throws Exception {
robot = new Robot();
robot.setAutoWaitForIdle(true);
robot.setAutoDelay(200);
List<String> lafs = Arrays.stream(getInstalledLookAndFeels())
.map(LookAndFeelInfo::getClassName)
.collect(Collectors.toList());
for (final String laf : lafs) {
try {
count = 0;
AtomicBoolean lafSetSuccess = new AtomicBoolean(false);
SwingUtilities.invokeAndWait(() -> {
lafSetSuccess.set(setLookAndFeel(laf));
if (lafSetSuccess.get()) {
createUI();
}
});
if (!lafSetSuccess.get()) {
continue;
}
robot.waitForIdle();

SwingUtilities
.invokeAndWait(() -> buttonComboBox.getPreferredSize());

robot.waitForIdle();
if (count > 6) {
System.out.println("Test Failed");
throw new RuntimeException(
"Custom Renderer got called " + count + " times, " +
"even after calling setPrototypeDisplayValue(), " +
"but the expected maximum is 6 times for " + laf);
} else {
System.out.println("Test Passed for " + laf);
}
} finally {
SwingUtilities.invokeAndWait(
JComboBoxPrototypeDisplayValueTest::disposeFrame);
}
}
}

public static void createUI() {
Vector data = new Vector(IntStream.rangeClosed(1, 100).boxed()
.map(i -> new JButton("" + i))
.collect(Collectors.toList()));
buttonComboBox = new JComboBox(data);
ButtonRenderer renderer = new ButtonRenderer();
buttonComboBox.setRenderer(renderer);
buttonComboBox.setMaximumRowCount(25);

// New method introduced in Java 1.4
buttonComboBox.setPrototypeDisplayValue(new JButton("111111111"));

frame = new JFrame();
JPanel panel = new JPanel();
panel.add(buttonComboBox);
frame.getContentPane().add(panel);
frame.setSize(200, 100);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setVisible(true);
}

private static boolean setLookAndFeel(String lafName) {
try {
UIManager.setLookAndFeel(lafName);
} catch (UnsupportedLookAndFeelException ignored) {
System.out.println("Ignoring Unsupported L&F: " + lafName);
return false;
} catch (ClassNotFoundException | InstantiationException
| IllegalAccessException e) {
throw new RuntimeException(e);
}
return true;
}

private static void disposeFrame() {
if (frame != null) {
frame.dispose();
frame = null;
}
}

/**
* Custom ListCellRenderer used for the drop down portion and the text
* portion of the ComboBox.
*/
private static class ButtonRenderer implements ListCellRenderer {
private final Color selectedBackground;
private final Color selectedForeground;
private final Color background;
private final Color foreground;

public ButtonRenderer() {
selectedBackground = Color.BLUE;
selectedForeground = Color.YELLOW;
background = Color.GRAY;
foreground = Color.RED;
}

public Component getListCellRendererComponent(JList list, Object value,
int index,
boolean isSelected,
boolean cellHasFocus) {
JButton button = (JButton) value;
System.out.println(
"getListCellRendererComponent index = " + index + ", " +
"isSelected = " + isSelected + ", cellHasFocus = " +
cellHasFocus);

button.setBackground(isSelected ? selectedBackground : background);
button.setForeground(isSelected ? selectedForeground : foreground);

count++;
System.out.println("Value of the Counter is " + count);

return button;
}

}

}

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