8295774: Write a test to verify List sends ItemEvent/ActionEvent

Backport-of: 2a79dfc1f9c419e92aac99f92ef4e40a3471695b

test/jdk/java/awt/event/ComponentEvent/ListItemEventsTest.java

@@ -0,0 +1,175 @@
+/*
+ * 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.Dimension;
+import java.awt.EventQueue;
+import java.awt.FlowLayout;
+import java.awt.Frame;
+import java.awt.List;
+import java.awt.Point;
+import java.awt.Robot;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
+import java.awt.event.MouseEvent;
+
+/*
+ * @test
+ * @key headful
+ * @bug 8295774
+ * @summary Verify that List Item selection via mouse/keys generates ItemEvent/ActionEvent appropriately.
+ * @run main ListItemEventsTest
+ */
+public class ListItemEventsTest {
+
+    private static final int MOUSE_DELAY = 100;
+    private static final int KEYBOARD_DELAY = 1000;
+
+    private static Frame frame;
+    private volatile static List list;
+    private volatile static boolean actionPerformed = false;
+    private volatile static boolean itemStateChanged = false;
+    private static Robot robot;
+
+    public static void initializeGUI() {
+        frame = new Frame("Test Frame");
+        frame.setLayout(new FlowLayout());
+        list = new List();
+        list.add("One");
+        list.add("Two");
+        list.add("Three");
+        list.add("Four");
+        list.add("Five");
+        list.addItemListener((event) -> {
+            System.out.println("Got an ItemEvent: " + event);
+            itemStateChanged = true;
+        });
+        list.addActionListener((event) -> {
+            System.out.println("Got an ActionEvent: " + event);
+            actionPerformed = true;
+        });
+
+        frame.add(list);
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+    }
+
+    public static void main(String[] s) throws Exception {
+        robot = new Robot();
+        try {
+            robot.setAutoDelay(MOUSE_DELAY);
+            robot.setAutoWaitForIdle(true);
+
+            EventQueue.invokeLater(ListItemEventsTest::initializeGUI);
+            robot.waitForIdle();
+
+            Point listAt = list.getLocationOnScreen();
+            Dimension listSize = list.getSize();
+            robot.mouseMove(listAt.x + listSize.width / 2,
+                listAt.y + listSize.height / 2);
+
+            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+
+            if (!itemStateChanged) {
+                throw new RuntimeException(
+                    "FAIL: List did not trigger ItemEvent when item selected!");
+            }
+
+            robot.mousePress(MouseEvent.BUTTON1_DOWN_MASK);
+            robot.mouseRelease(MouseEvent.BUTTON1_DOWN_MASK);
+            robot.mousePress(MouseEvent.BUTTON1_DOWN_MASK);
+            robot.mouseRelease(MouseEvent.BUTTON1_DOWN_MASK);
+
+            if (!actionPerformed) {
+                throw new RuntimeException(
+                    "FAIL: List did not trigger ActionEvent when double"
+                        + " clicked!");
+            }
+
+            itemStateChanged = false;
+            actionPerformed = false;
+
+            EventQueue.invokeAndWait(() -> list.select(0));
+            robot.waitForIdle();
+
+            if (itemStateChanged) {
+                throw new RuntimeException(
+                    "FAIL: List triggered ItemEvent when item selected by "
+                        + "calling the API!");
+            }
+
+            robot.setAutoDelay(KEYBOARD_DELAY);
+
+            itemStateChanged = false;
+            typeKey(KeyEvent.VK_DOWN);
+
+            if (!itemStateChanged) {
+                throw new RuntimeException(
+                    "FAIL: List did not trigger ItemEvent when item selected by"
+                        + " down arrow key!");
+            }
+
+            itemStateChanged = false;
+            typeKey(KeyEvent.VK_UP);
+
+            if (!itemStateChanged) {
+                throw new RuntimeException(
+                    "FAIL: List did not trigger ItemEvent when item selected by"
+                        + " up arrow key!");
+            }
+
+            if (actionPerformed) {
+                throw new RuntimeException(
+                    "FAIL: List triggerd ActionEvent unnecessarily. Action generated"
+                        + " when item selected using API or UP/DOWN keys!");
+            }
+
+            actionPerformed = false;
+            typeKey(KeyEvent.VK_ENTER);
+
+            if (!actionPerformed) {
+                throw new RuntimeException(
+                    "FAIL: List did not trigger ActionEvent when enter"
+                        + " key typed!");
+            }
+
+            System.out.println("Test passed!");
+
+        } finally {
+            EventQueue.invokeAndWait(ListItemEventsTest::disposeFrame);
+        }
+    }
+
+    public static void disposeFrame() {
+        if (frame != null) {
+            frame.dispose();
+            frame = null;
+        }
+    }
+
+    private static void typeKey(int key) throws Exception {
+        robot.keyPress(key);
+        robot.keyRelease(key);
+    }
+}