8282936: Write a regression test for JDK-4615365

Backport-of: c3d903a55a9f606db8604d5a8c091b0fc3c6a988

test/jdk/javax/swing/JSplitPane/4615365/JSplitPaneDividerLocationTest.java

@@ -0,0 +1,200 @@
+/*
+ * 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.BorderLayout;
+import java.awt.Point;
+import java.awt.Robot;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.InputEvent;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
+import javax.swing.AbstractButton;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.JSplitPane;
+import javax.swing.JToggleButton;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UIManager.LookAndFeelInfo;
+import javax.swing.UnsupportedLookAndFeelException;
+
+import static javax.swing.UIManager.getInstalledLookAndFeels;
+/*
+ * @test
+ * @key headful
+ * @bug 4615365
+ * @summary This test confirms that the JSplitPane's current and last
+ *          divider positions are correct when realized.
+ * @run main JSplitPaneDividerLocationTest
+ */
+public class JSplitPaneDividerLocationTest {
+
+    private static JFrame frame;
+    private static JPanel panel;
+    private static JButton leftButton;
+    private static JToggleButton triggerButton;
+    private static volatile int currentLoc;
+    private static volatile int lastLoc;
+    private static volatile int lastLocExpected;
+    private static Robot robot;
+
+    public static void main(String[] s) throws Exception {
+        robot = new Robot();
+        robot.setAutoWaitForIdle(true);
+        robot.setAutoDelay(200);
+        List<String> lafs = Arrays.stream(getInstalledLookAndFeels())
+                                  .map(LookAndFeelInfo::getClassName)
+                                  .collect(Collectors.toList());
+        for (final String laf : lafs) {
+            try {
+                AtomicBoolean lafSetSuccess = new AtomicBoolean(false);
+                SwingUtilities.invokeAndWait(() -> {
+                    lafSetSuccess.set(setLookAndFeel(laf));
+                    if (lafSetSuccess.get()) {
+                        createUI();
+                    }
+                });
+                if (!lafSetSuccess.get()) {
+                    continue;
+                }
+                robot.waitForIdle();
+
+                pressButton(triggerButton);
+
+                // Verifies that JSplitPane current and last divider
+                // positions are correct and not as per JDK-4615365.
+                if ((currentLoc == -1) || (lastLoc == 0)) {
+                    throw new RuntimeException(
+                            "Test failed for " + laf + " :- last divider loc:" +
+                            "actual = " + lastLoc + ",expected = -1, current " +
+                            "divider loc:actual=" + currentLoc + ",expected>0");
+                }
+                lastLocExpected = currentLoc;
+
+                // Slide the split pane divider slightly to the right side.
+                final Point leftButtonLoc = getButtonLoc(leftButton);
+                robot.mouseMove(leftButtonLoc.x + leftButton.getWidth() + 5,
+                                leftButtonLoc.y + 35);
+                robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+                robot.mouseMove(leftButtonLoc.x + leftButton.getWidth() + 8,
+                                leftButtonLoc.y + 35);
+                robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+                pressButton(triggerButton);
+
+                // Verifies that JSplitPane current and last divider positions
+                // reflects the correct positions after a right slide.
+                if ((lastLoc == lastLocExpected) && (currentLoc > lastLoc)) {
+                    System.out.println("Test Passed.");
+                } else {
+                    throw new RuntimeException(
+                            "Test failed for " + laf + ", because after a " +
+                            "right " + "slide" + ", last divider " +
+                            "location: " + "actual = " + lastLoc +
+                            ", expected = " + lastLocExpected +
+                            ", current divider " + "location: actual = " +
+                            currentLoc + ", expected > " + lastLoc);
+                }
+            } finally {
+                SwingUtilities.invokeAndWait(
+                        JSplitPaneDividerLocationTest::disposeFrame);
+            }
+        }
+    }
+
+    private static void pressButton(JToggleButton button) throws Exception {
+        final Point buttonLoc = getButtonLoc(button);
+        robot.mouseMove(buttonLoc.x + 8, buttonLoc.y + 8);
+        robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+        robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+    }
+
+    private static Point getButtonLoc(AbstractButton button)
+            throws InterruptedException, InvocationTargetException {
+        final AtomicReference<Point> loc = new AtomicReference<>();
+        SwingUtilities.invokeAndWait(() -> {
+            loc.set(button.getLocationOnScreen());
+        });
+        final Point buttonLoc = loc.get();
+        return buttonLoc;
+    }
+
+    private static void createUI() {
+        frame = new JFrame();
+        panel = new JPanel();
+        panel.setLayout(new BorderLayout());
+        leftButton = new JButton("Left Button");
+        JButton rightButton = new JButton("Right Button");
+
+        final JSplitPane splitPane =
+                new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, true, leftButton,
+                               rightButton);
+        panel.add(splitPane, BorderLayout.CENTER);
+
+        splitPane.setDividerSize(10);
+
+        triggerButton = new JToggleButton("Trigger");
+        triggerButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent event) {
+                currentLoc = splitPane.getDividerLocation();
+                lastLoc = splitPane.getLastDividerLocation();
+                System.out.println(
+                        "currentLoc = " + currentLoc + ", lastLoc = " +
+                        lastLoc);
+            }
+        });
+        panel.add(triggerButton, BorderLayout.SOUTH);
+
+        frame.setContentPane(panel);
+        frame.setSize(300, 300);
+        frame.setLocationRelativeTo(null);
+        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+        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;
+        }
+    }
+
+}