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bug4276920.java
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bug4276920.java
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/*
* Copyright (c) 2001, 2023, 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 4276920
@summary Tests that BasicComboPopup.hide() doesn't cause unnecessary repaints
@key headful
*/
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class bug4276920 {
static volatile TestComboBox combo;
static volatile JFrame frame;
public static void main(String[] args) throws Exception {
try {
SwingUtilities.invokeAndWait(bug4276920::createUI);
Thread.sleep(2000);
int before = combo.getRepaintCount();
SwingUtilities.invokeAndWait(combo::hidePopup);
int after = combo.getRepaintCount();
if (after > before) {
throw new Error("Failed 4276920: BasicComboPopup.hide() caused unnecessary repaint()");
}
} finally {
if (frame != null) {
SwingUtilities.invokeAndWait(frame::dispose);
}
}
}
static void createUI() {
combo = new TestComboBox(new String[] {"Why am I so slow?"});
frame = new JFrame("bug4276920");
frame.getContentPane().add(combo);
frame.pack();
frame.validate();
frame.setVisible(true);
}
static class TestComboBox extends JComboBox {
int count = 0;
TestComboBox(Object[] content) {
super(content);
}
public void repaint() {
super.repaint();
count++;
}
int getRepaintCount() {
return count;
}
}
}