8299296: Write a test to verify the components selection sends ItemEvent

Backport-of: 5ae6de859d472d107cdf642c417c6d2f1c74e5db

Author: Victor Rudometov

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

@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2007, 2023, 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.Checkbox;
+import java.awt.Choice;
+import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.awt.FlowLayout;
+import java.awt.Frame;
+import java.awt.Point;
+import java.awt.Robot;
+import java.awt.event.InputEvent;
+
+/*
+ * @test
+ * @key headful
+ * @bug 8299296
+ * @summary Verify that Component selection via mouse generates ItemEvent.
+ * @run main ComponentItemEventTest
+ */
+public class ComponentItemEventTest {
+
+    private static Frame frame;
+    private volatile static Choice choice;
+    private volatile static Checkbox cb;
+    private static Robot robot;
+    private volatile static boolean cbStateChanged = false;
+    private volatile static boolean choiceStateChanged = false;
+    private volatile static Point compAt;
+    private volatile static Dimension compSize;
+
+    private static void initializeGUI() {
+        frame = new Frame("Test Frame");
+        frame.setLayout(new FlowLayout());
+        choice = new Choice();
+        for (int i = 0; i < 8; i++) {
+            choice.add("Choice "+i);
+        }
+        choice.select(3);
+        choice.addItemListener((event) -> {
+            System.out.println("Choice got an ItemEvent: " + event);
+            choiceStateChanged = true;
+        });
+
+        cb = new Checkbox("CB");
+        cb.addItemListener((event) -> {
+            System.out.println("Checkbox got an ItemEvent: " + event);
+            cbStateChanged = true;
+        });
+        frame.add(choice);
+        frame.add(cb);
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+    }
+
+    public static void main(String[] args) throws Exception {
+        try {
+            EventQueue.invokeAndWait(ComponentItemEventTest::initializeGUI);
+            robot = new Robot();
+            robot.setAutoDelay(1000);
+            robot.setAutoWaitForIdle(true);
+
+            robot.waitForIdle();
+            EventQueue.invokeAndWait(() -> {
+                compAt = choice.getLocationOnScreen();
+                compSize = choice.getSize();
+            });
+            robot.mouseMove(compAt.x + choice.getSize().width - 10,
+                compAt.y + compSize.height / 2);
+            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+            robot.mouseMove(compAt.x + compSize.width / 2,
+                compAt.y + compSize.height + 15);
+            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+
+            robot.waitForIdle();
+            if (!choiceStateChanged) {
+                throw new RuntimeException(
+                    "FAIL: Choice did not trigger ItemEvent when item selected!");
+            }
+
+            EventQueue.invokeAndWait(() -> {
+                compAt = cb.getLocationOnScreen();
+                compSize = cb.getSize();
+            });
+            robot.mouseMove(compAt.x + compSize.width / 2,
+                compAt.y + compSize.height / 2);
+            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+
+            robot.waitForIdle();
+            if (!cbStateChanged) {
+                throw new RuntimeException(
+                    "FAIL: Checkbox did not trigger ItemEvent when item selected!");
+            }
+            System.out.println("Test passed!");
+        } finally {
+            EventQueue.invokeAndWait(ComponentItemEventTest::disposeFrame);
+        }
+    }
+
+    public static void disposeFrame() {
+        if (frame != null) {
+            frame.dispose();
+            frame = null;
+        }
+    }
+}