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/*
* Copyright (c) 2020, 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
* @key headful
* @bug 6542439
* @summary Verifies memory leak in BasicComboBoxUI and MetalComboBoxButton
* @run main TestMemLeakComboBox
*/
import java.awt.Graphics;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComboBox;
import javax.swing.CellRendererPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestMemLeakComboBox {
private static JFrame frame;
private static String failed = null;
private static void setLookAndFeel(UIManager.LookAndFeelInfo laf) {
try {
UIManager.setLookAndFeel(laf.getClassName());
} catch (UnsupportedLookAndFeelException ignored) {
System.out.println("Unsupported L&F: " + laf.getClassName());
} catch (ClassNotFoundException | InstantiationException
| IllegalAccessException e) {
throw new RuntimeException(e);
}
}
private static class MyPanel extends JPanel {
public void paint(Graphics g) {
super.paint(g);
for (Component child : getComponents()) {
verifyChild(child);
}
}
private void verifyChild(Component c) {
if (c instanceof JComboBox) {
for (Component child : ((Container)c).getComponents()) {
if (child instanceof CellRendererPane &&
((CellRendererPane)child).getComponentCount() > 0) {
failed = new String("CellRendererPane still has children for: " + c);
}
}
}
}
}
public static void main(String[] args) throws Exception {
for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
System.out.println("Testing l&f : " + laf.getClassName());
SwingUtilities.invokeAndWait(() -> setLookAndFeel(laf));
test();
if (failed != null) {
throw new RuntimeException(failed);
}
}
}
private static void test() throws Exception {
try {
SwingUtilities.invokeAndWait(() -> {
frame = new JFrame();
JPanel panel = new MyPanel();
panel.setPreferredSize(new Dimension(100, 100));
panel.setLayout(new FlowLayout());
panel.add(new JComboBox(new String[]{"one", "two", "three"}));
frame.add(panel);
frame.pack();
frame.setVisible(true);
});
} finally {
if (frame != null) {
SwingUtilities.invokeAndWait(() -> frame.dispose());
}
}
}
}
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