8282640: Create a test for JDK-4740761

Backport-of: fad3b9478663d319d1136422e6b4bea72a540544

test/jdk/java/awt/Focus/8282640/ScrollPaneFocusBugTest.java

@@ -0,0 +1,131 @@
+/*
+ * 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.
+ */
+
+/*
+ * @test
+ * @bug 4740761
+ * @key headful
+ * @summary Focus stays with the ScrollPane despite
+ * it being removed from the Parent
+ * @run main ScrollPaneFocusBugTest
+ */
+
+import java.awt.BorderLayout;
+import java.awt.Container;
+import java.awt.KeyboardFocusManager;
+import java.awt.Robot;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+
+import javax.swing.JComponent;
+import javax.swing.JFrame;
+import javax.swing.JScrollPane;
+import javax.swing.JTextArea;
+import javax.swing.JTextField;
+import javax.swing.SwingUtilities;
+
+public class ScrollPaneFocusBugTest {
+
+    private static volatile String focussedComponentName;
+    private static JScrollPane scrollPane;
+    private static JFrame frame;
+    private static Robot robot;
+
+    private static volatile int xLocn;
+    private static volatile int yLocn;
+    private static volatile int width;
+    private static volatile int height;
+
+    public static JScrollPane
+    createScrollPaneComponent(JComponent componentToMoveFocusTo) {
+        JTextArea textArea = new JTextArea("1111\n2222\n3333\n4444\n5555\n");
+        JScrollPane scrollPaneComponent = new JScrollPane(textArea);
+        textArea.addKeyListener(new KeyAdapter() {
+            public void keyTyped(KeyEvent e) {
+                Container parent = scrollPaneComponent.getParent();
+                parent.remove(scrollPaneComponent);
+                parent.validate();
+                parent.repaint();
+                componentToMoveFocusTo.requestFocus();
+            }
+        });
+        return scrollPaneComponent;
+    }
+
+    public static void main(String[] args) throws Exception {
+        SwingUtilities.invokeAndWait(() -> createGUI());
+
+        robot = new Robot();
+        robot.setAutoDelay(200);
+        robot.setAutoWaitForIdle(true);
+
+        pressKey();
+
+        SwingUtilities.invokeAndWait(() -> focussedComponentName =
+            KeyboardFocusManager.getCurrentKeyboardFocusManager()
+            .getFocusOwner().getClass().getName());
+
+        if (focussedComponentName.equals("javax.swing.JTextField")) {
+            System.out.println(
+                "Test Passed: Focus shifted to JTextField"
+                + "after removing ScrollPane");
+        } else {
+            throw new RuntimeException(
+                "Test Failed: Focus did not shift to JTextField after"
+                + "removing ScrollPane, current"
+                + " Focus with " + focussedComponentName);
+        }
+        SwingUtilities.invokeAndWait(() -> frame.dispose());
+    }
+
+    protected static void pressKey() throws Exception {
+        SwingUtilities.invokeAndWait(() -> {
+            xLocn = scrollPane.getLocationOnScreen().x;
+            yLocn = scrollPane.getLocationOnScreen().y;
+            width = scrollPane.getSize().width;
+            height = scrollPane.getSize().height;
+        });
+
+        robot.mouseMove(xLocn + width / 2, yLocn + height / 2);
+
+        robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+        robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+
+        robot.keyPress(KeyEvent.VK_1);
+        robot.keyRelease(KeyEvent.VK_1);
+    }
+
+    public static void createGUI() {
+        frame = new JFrame();
+        frame.setLayout(new BorderLayout());
+        JTextField textField = new JTextField("Second Component");
+        frame.add(textField, BorderLayout.SOUTH);
+        scrollPane = createScrollPaneComponent(textField);
+        frame.add(scrollPane, BorderLayout.CENTER);
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+    }
+}
+