8285698: Create a test to check the focus stealing of JPopupMenu from JComboBox

Reviewed-by: prr

test/jdk/javax/swing/JPopupMenu/JPopupMenuFocusStealTest.java

@@ -0,0 +1,179 @@
+/*
+ * Copyright (c) 2002, 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.BorderLayout;
+import java.awt.Point;
+import java.awt.Robot;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
+import javax.swing.JComboBox;
+import javax.swing.JComponent;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JMenuItem;
+import javax.swing.JPanel;
+import javax.swing.JPopupMenu;
+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 4632782
+ * @summary This test checks CCC #4632782, which verifies that showing a
+ *          JPopupMenu shouldn't steal the focus out of current focused component.
+ * @run main JPopupMenuFocusStealTest
+ */
+public class JPopupMenuFocusStealTest {
+    private static JPopupMenu popupMenu;
+    private static JComboBox comboBox;
+    private static JFrame frame;
+    private static Robot robot;
+    private static JLabel label;
+
+    public static void main(String[] args) throws Exception {
+        robot = new Robot();
+        robot.setAutoDelay(200);
+        robot.setAutoWaitForIdle(true);
+
+        List<String> lafs = Arrays.stream(getInstalledLookAndFeels())
+                                  .map(LookAndFeelInfo::getClassName)
+                                  .collect(Collectors.toList());
+        for (final String laf : lafs) {
+                AtomicBoolean lafSetSuccess = new AtomicBoolean(false);
+                SwingUtilities.invokeAndWait(() -> {
+                    lafSetSuccess.set(setLookAndFeel(laf));
+                    if (lafSetSuccess.get()) {
+                        createUI();
+                    }
+                });
+                if (!lafSetSuccess.get()) {
+                    continue;
+                }
+                robot.waitForIdle();
+
+                // Bring the mouse pointer to label
+                mouseClick(label);
+                // Get the Popup menu by Mouse Button 3 click
+                robot.mousePress(InputEvent.BUTTON3_DOWN_MASK);
+                robot.mouseRelease(InputEvent.BUTTON3_DOWN_MASK);
+                hitKeys(KeyEvent.VK_DOWN, KeyEvent.VK_DOWN, KeyEvent.VK_ENTER);
+                final AtomicBoolean isFocusOwner = new AtomicBoolean(false);
+                SwingUtilities.invokeAndWait(
+                        () -> isFocusOwner.set(comboBox.isFocusOwner()));
+                SwingUtilities
+                        .invokeAndWait(JPopupMenuFocusStealTest::disposeFrame);
+                if (isFocusOwner.get()) {
+                    System.out.println("Test Passed for " + laf);
+                } else {
+                    throw new RuntimeException("Test Failed for " + laf);
+                }
+        }
+    }
+
+    private static void createUI() {
+        frame = new JFrame();
+        frame.setTitle("Popup Menu Application");
+        JPanel topPanel = new JPanel(new BorderLayout());
+        Object[] array = {"Item1", "Item2", "Item3"};
+        comboBox = new JComboBox(array);
+        label = new JLabel("Check focus transfer from Combo to Popupmenu");
+        topPanel.add(comboBox, BorderLayout.NORTH);
+        topPanel.add(label, BorderLayout.CENTER);
+        frame.getContentPane().add(topPanel);
+
+        // Create some menu items for the popup
+        popupMenu = new JPopupMenu("Menu");
+        popupMenu.add(new JMenuItem("New"));
+        popupMenu.add(new JMenuItem("Open..."));
+        popupMenu.add(new JMenuItem("Save"));
+        popupMenu.add(new JMenuItem("Save As..."));
+        popupMenu.add(new JMenuItem("Exit"));
+
+        topPanel.addMouseListener(new PopupMenuEventListener());
+        popupMenu.setFocusable(false);
+        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+        frame.setLocationRelativeTo(null);
+        frame.pack();
+        frame.setVisible(true);
+    }
+
+    private static void mouseClick(JComponent jComponent) throws Exception {
+        final AtomicReference<Point> loc = new AtomicReference<>();
+        SwingUtilities
+                .invokeAndWait(() -> loc.set(jComponent.getLocationOnScreen()));
+        final Point location = loc.get();
+        robot.mouseMove(location.x + 15, location.y + 5);
+        robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+        robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+    }
+
+    private static void hitKeys(int... keys) {
+        for (int key : keys) {
+            robot.keyPress(key);
+        }
+        for (int i = keys.length - 1; i >= 0; i--) {
+            robot.keyRelease(keys[i]);
+        }
+    }
+
+    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;
+        }
+    }
+
+    private static class PopupMenuEventListener extends MouseAdapter {
+        public void mousePressed(MouseEvent me) {
+            if (me.isPopupTrigger()) {
+                popupMenu.show(me.getComponent(), me.getX(), me.getY());
+            }
+        }
+
+    }
+
+}