8281738: Create a regression test for checking the 'Space' key activation of focused Button

Reviewed-by: aivanov

test/jdk/javax/swing/JButton/4659800/SpaceKeyActivatesButton.java

@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 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.Robot;
+import java.awt.event.FocusAdapter;
+import java.awt.event.FocusEvent;
+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 javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+
+
+import static java.util.stream.Collectors.toList;
+
+/*
+ * @test
+ * @key headful
+ * @bug 8281738
+ * @summary Check whether pressing <Space> key generates
+ *          ActionEvent on focused Button or not.
+ * @run main SpaceKeyActivatesButton
+ */
+public class SpaceKeyActivatesButton {
+
+    private static volatile boolean buttonPressed;
+    private static JFrame frame;
+    private static JButton focusedButton;
+    private static CountDownLatch buttonGainedFocusLatch;
+
+    public static void main(String[] s) throws Exception {
+        runTest();
+    }
+
+    public static void runTest() throws Exception {
+        Robot robot = new Robot();
+        robot.setAutoDelay(100);
+        robot.setAutoWaitForIdle(true);
+
+        List<String> lafs = Arrays.stream(UIManager.getInstalledLookAndFeels())
+                                  .map(laf -> laf.getClassName())
+                                  .collect(toList());
+        for (String laf : lafs) {
+            buttonGainedFocusLatch = new CountDownLatch(1);
+            try {
+                buttonPressed = false;
+                System.out.println("Testing laf : " + laf);
+                AtomicBoolean lafSetSuccess = new AtomicBoolean(false);
+                SwingUtilities.invokeAndWait(() -> {
+                    lafSetSuccess.set(setLookAndFeel(laf));
+                    // Call createUI() only if setting laf succeeded
+                    if (lafSetSuccess.get()) {
+                        createUI();
+                    }
+                });
+                // If setting laf failed, then just get next laf and continue
+                if (!lafSetSuccess.get()) {
+                    continue;
+                }
+                robot.waitForIdle();
+
+                // Wait until the button2 gains focus.
+                if (!buttonGainedFocusLatch.await(3, TimeUnit.SECONDS)) {
+                    throw new RuntimeException("Test Failed, waited too long, " +
+                            "but the button can't gain focus for laf : " + laf);
+                }
+
+                robot.keyPress(KeyEvent.VK_SPACE);
+                robot.keyRelease(KeyEvent.VK_SPACE);
+
+                if (buttonPressed) {
+                    System.out.println("Test Passed for laf : " + laf);
+                } else {
+                    throw new RuntimeException("Test Failed, button not pressed for laf : " + laf);
+                }
+
+            } finally {
+                SwingUtilities.invokeAndWait(SpaceKeyActivatesButton::disposeFrame);
+            }
+        }
+
+    }
+
+    private static boolean setLookAndFeel(String lafName) {
+        try {
+            UIManager.setLookAndFeel(lafName);
+        } catch (UnsupportedLookAndFeelException ignored) {
+            System.out.println("Ignoring Unsupported laf : " + lafName);
+            return false;
+        } catch (ClassNotFoundException | InstantiationException
+                | IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+        return true;
+    }
+
+    private static void createUI() {
+        frame = new JFrame();
+        JPanel panel = new JPanel();
+        panel.add(new JButton("Button1"));
+        focusedButton = new JButton("Button2");
+        focusedButton.addActionListener(e -> buttonPressed = true);
+        focusedButton.addFocusListener(new FocusAdapter() {
+            @Override
+            public void focusGained(FocusEvent e) {
+                buttonGainedFocusLatch.countDown();
+            }
+        });
+        panel.add(focusedButton);
+
+        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+        frame.add(panel);
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+        focusedButton.requestFocusInWindow();
+    }
+
+    private static void disposeFrame() {
+        if (frame != null) {
+            frame.dispose();
+            frame = null;
+        }
+    }
+}