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/*
* Copyright (c) 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.
*/
import java.awt.Component;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.event.InputEvent;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.plaf.basic.BasicComboPopup;
/*
* @test
* @key headful
* @bug 6672644
* @summary Tests JComboBox scrollbar behavior when alt-tabbing
* @run main JComboBoxScrollFocusTest
*/
public class JComboBoxScrollFocusTest {
private static Robot robot;
private static JFrame comboboxFrame;
private static JComboBox<String> combobox;
public static void main(String[] args) throws Exception {
robot = new Robot();
try {
SwingUtilities.invokeAndWait(JComboBoxScrollFocusTest::createAndShowGUI);
doTest();
} finally {
SwingUtilities.invokeAndWait(comboboxFrame::dispose);
}
}
private static void createAndShowGUI() {
comboboxFrame = new JFrame("JComboBoxScrollFocusTest Test Frame");
combobox = new JComboBox<>();
for (int i = 0; i < 100; i++) {
combobox.addItem(String.valueOf(i));
}
comboboxFrame.add(combobox);
comboboxFrame.setSize(400, 200);
comboboxFrame.setLocationRelativeTo(null);
comboboxFrame.setVisible(true);
}
static Rectangle getOnScreenBoundsOnEDT(Component component) throws Exception {
robot.waitForIdle();
FutureTask<Rectangle> task = new FutureTask<>(()
-> new Rectangle(component.getLocationOnScreen(),
component.getSize()));
SwingUtilities.invokeLater(task);
return task.get(500, TimeUnit.MILLISECONDS);
}
private static JScrollBar getScrollBar() {
BasicComboPopup popup = (BasicComboPopup) combobox
.getAccessibleContext().getAccessibleChild(0);
JScrollPane scrollPane = (JScrollPane) popup
.getAccessibleContext().getAccessibleChild(0);
return scrollPane.getVerticalScrollBar();
}
private static int getScrollbarValue() throws Exception {
FutureTask<Integer> task = new FutureTask<>(() -> {
JScrollBar scrollBar = getScrollBar();
return scrollBar.getValue();
});
SwingUtilities.invokeAndWait(task);
return task.get(500, TimeUnit.MILLISECONDS);
}
private static void doTest() throws Exception {
robot.waitForIdle();
robot.delay(500);
Rectangle rectangle = getOnScreenBoundsOnEDT(combobox);
Point ptOpenComboboxPopup = new Point(rectangle.x + rectangle.width - 5,
rectangle.y + rectangle.height / 2);
robot.mouseMove(ptOpenComboboxPopup.x, ptOpenComboboxPopup.y);
robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
robot.waitForIdle();
robot.delay(500);
JScrollBar scrollBar = getScrollBar();
// Start scrolling
Rectangle scrollbarBounds = getOnScreenBoundsOnEDT(scrollBar);
robot.mouseMove(scrollbarBounds.x + scrollbarBounds.width / 2,
scrollbarBounds.y + scrollbarBounds.height - 5);
robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
robot.delay(1000);
if (getScrollbarValue() == 0) {
throw new RuntimeException("The scrollbar is not scrolling");
}
// closing popup by moving focus to the main window
comboboxFrame.requestFocus();
robot.waitForIdle();
robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
robot.waitForIdle();
robot.delay(500);
// open popup again
robot.mouseMove(ptOpenComboboxPopup.x, ptOpenComboboxPopup.y);
robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
robot.waitForIdle();
robot.delay(500);
if (getScrollbarValue() != 0) {
throw new RuntimeException("The scroll bar is scrolling");
}
}
}
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