8281745: Create a regression test for JDK-4514331

Backport-of: f9539521aee71e84cb052d3d0444c58ee88930f7

test/jdk/javax/swing/JTextArea/4514331/TabShiftsFocusToNextComponent.java

@@ -0,0 +1,176 @@
+/*
+ * 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.Point;
+import java.awt.Robot;
+import java.awt.event.FocusAdapter;
+import java.awt.event.FocusEvent;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.JTextArea;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+
+
+import static javax.swing.UIManager.getInstalledLookAndFeels;
+
+/*
+ * @test
+ * @key headful
+ * @bug 4514331
+ * @summary Check whether pressing <Tab> key always shift focus to next component,
+ *          even though the current focus is in JTextArea and some text is already selected.
+ * @run main TabShiftsFocusToNextComponent
+ */
+public class TabShiftsFocusToNextComponent {
+
+    private static JFrame frame;
+    private static JTextArea textArea;
+    private static Robot robot;
+    private static CountDownLatch textAreaGainedFocusLatch;
+    private static CountDownLatch buttonGainedFocusLatch;
+
+    public static void main(String[] s) throws Exception {
+        runTest();
+    }
+
+    public static void runTest() throws Exception {
+        robot = new Robot();
+        robot.setAutoWaitForIdle(true);
+        robot.setAutoDelay(200);
+        List<String> lafs = Arrays.stream(getInstalledLookAndFeels())
+                                  .map(UIManager.LookAndFeelInfo::getClassName)
+                                  .collect(Collectors.toList());
+        for (final String laf : lafs) {
+            textAreaGainedFocusLatch = new CountDownLatch(1);
+            buttonGainedFocusLatch = new CountDownLatch(1);
+            try {
+                AtomicBoolean lafSetSuccess = new AtomicBoolean(false);
+                SwingUtilities.invokeAndWait(() -> {
+                    lafSetSuccess.set(setLookAndFeel(laf));
+                    if (lafSetSuccess.get()) {
+                        createUI();
+                    }
+                });
+                if (!lafSetSuccess.get()) {
+                    continue;
+                }
+                robot.waitForIdle();
+
+                SwingUtilities.invokeAndWait(() -> textArea.requestFocusInWindow());
+
+                // Waits until the textArea gains focus.
+                if (!textAreaGainedFocusLatch.await(3, TimeUnit.SECONDS)) {
+                    throw new RuntimeException("Test Failed, waited for long, " +
+                            "but the JTextArea can't gain focus for L&F: " + laf);
+                }
+
+                AtomicReference<Point> textAreaLoc = new AtomicReference<Point>();
+                SwingUtilities.invokeAndWait(() -> {
+                    textAreaLoc.set(textArea.getLocationOnScreen());
+                });
+
+                final int x = textAreaLoc.get().x;
+                final int y = textAreaLoc.get().y;
+                robot.mouseMove(x + 5, y + 5);
+                robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+                robot.mouseMove(x + 20, y + 5);
+                robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+                robot.keyPress(KeyEvent.VK_TAB);
+                robot.keyRelease(KeyEvent.VK_TAB);
+
+                // Waits until the button gains focus.
+                if (!buttonGainedFocusLatch.await(3, TimeUnit.SECONDS)) {
+                    throw new RuntimeException("Test Failed, waited for long, " +
+                            "but the Button can't gain focus when 'Tab' key pressed for L&F: " + laf);
+                } else {
+                    System.out.println(" Test passed for " + laf);
+                }
+            } finally {
+                SwingUtilities.invokeAndWait(TabShiftsFocusToNextComponent::disposeFrame);
+            }
+        }
+    }
+
+
+    private static void createUI() {
+        frame = new JFrame();
+        JPanel panel = new JPanel();
+        textArea = new JTextArea("I am a JTextArea");
+        textArea.addFocusListener(new FocusAdapter() {
+            @Override
+            public void focusGained(FocusEvent e) {
+                textAreaGainedFocusLatch.countDown();
+            }
+        });
+        textArea.setEditable(false);
+        panel.add(textArea);
+        JButton button = new JButton("Button");
+        panel.add(button);
+        button.addFocusListener(new FocusAdapter() {
+            @Override
+            public void focusGained(FocusEvent e) {
+                buttonGainedFocusLatch.countDown();
+            }
+        });
+
+        frame.add(panel);
+        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+        frame.setUndecorated(true);
+        frame.pack();
+        frame.setAlwaysOnTop(true);
+        frame.setLocationRelativeTo(null);
+        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;
+        }
+    }
+}