8282937: Write a regression test for JDK-4820080

Backport-of: 849b19523a666bd2ec110876bfd5679b20be77f4

test/jdk/javax/swing/JSplitPane/4820080/JSplitPaneDragColorTest.java

@@ -0,0 +1,205 @@
+/*
+ * Copyright (c) 2003, 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.Color;
+import java.awt.Dimension;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Robot;
+import java.awt.Toolkit;
+import java.awt.event.InputEvent;
+import java.io.File;
+import java.io.IOException;
+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.imageio.ImageIO;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JSplitPane;
+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 4820080
+ * @summary This test confirms that the Drag color of JSplitPane divider should
+ *          be the user specified one(Red here).
+ * @run main JSplitPaneDragColorTest
+ */
+public class JSplitPaneDragColorTest {
+
+    // Tolerance is set inorder to negate small differences in pixel color values,
+    // especially in Mac machines.
+    private final static int COLOR_TOLERANCE = 9;
+    private static final Color EXPECTED_DRAG_COLOR = Color.RED;
+    private static JFrame frame;
+    private static JSplitPane pane;
+    private static Robot robot;
+
+    public static void main(String[] args) throws Exception {
+
+        robot = new Robot();
+        robot.setAutoWaitForIdle(true);
+        robot.setAutoDelay(200);
+        // Skipping NimbusLookAndFeel & GTKLookAndFeel,
+        // as both are not supported for this feature - JDK-8075914, JDK-8075608
+        List<String> lafs = Arrays.stream(getInstalledLookAndFeels())
+                .filter(laf -> !(laf.getName().contains("GTK")
+                        || laf.getName().contains("Nimbus")))
+                .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();
+
+                Rectangle dividerRect = getDividerRect();
+
+                // Mouse click and right drag split pane divider
+                robot.mouseMove(dividerRect.x + 5, dividerRect.y + 36);
+                robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+                robot.mouseMove(dividerRect.x + 15, dividerRect.y + 36);
+                robot.mouseMove(dividerRect.x + 5, dividerRect.y + 36);
+
+                // Get the color of one of the pixels of the splitpane divider
+                // after the drag has started. Ideally it should be the
+                // SplitPaneDivider.draggingColor set by user, otherwise the test fails
+                final Color actualDragColor = robot.getPixelColor(dividerRect.x + 2,
+                        dividerRect.y + 2);
+                if (checkDragColor(actualDragColor)) {
+                    System.out.println("Test passed in " + laf);
+                } else {
+                    System.out.print("Expected pixel color = ");
+                    System.out.printf("%X", EXPECTED_DRAG_COLOR.getRGB());
+                    System.out.print(", but actual color = ");
+                    System.out.printf("%X", actualDragColor.getRGB());
+                    System.out.println();
+                    captureScreen();
+                    throw new RuntimeException("Test failed, drag color is wrong in "
+                            + laf);
+                }
+            } finally {
+                robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+                SwingUtilities.invokeAndWait(JSplitPaneDragColorTest::disposeFrame);
+            }
+        }
+    }
+
+    private static boolean checkDragColor(Color actualDragColor) {
+        int actualRed = actualDragColor.getRed();
+        int actualGreen = actualDragColor.getGreen();
+        int actualBlue = actualDragColor.getBlue();
+        int expectedRed = EXPECTED_DRAG_COLOR.getRed();
+        int expectedGreen = EXPECTED_DRAG_COLOR.getGreen();
+        int expectedBlue = EXPECTED_DRAG_COLOR.getBlue();
+
+        final double tolerance = Math.sqrt(
+                (actualRed - expectedRed) * (actualRed - expectedRed) +
+                        (actualGreen - expectedGreen) * (actualGreen - expectedGreen) +
+                        (actualBlue - expectedBlue) * (actualBlue - expectedBlue));
+        return (tolerance <= COLOR_TOLERANCE);
+    }
+
+    private static Rectangle getDividerRect() {
+        final AtomicReference<Rectangle> rect = new AtomicReference<>();
+        SwingUtilities.invokeLater(() -> {
+            javax.swing.plaf.basic.BasicSplitPaneUI ui =
+                    (javax.swing.plaf.basic.BasicSplitPaneUI) pane.getUI();
+
+            javax.swing.plaf.basic.BasicSplitPaneDivider divider = ui.getDivider();
+            Point dividerLoc = divider.getLocationOnScreen();
+            rect.set(new Rectangle(dividerLoc.x, dividerLoc.y, divider.getWidth(),
+                    divider.getHeight()));
+        });
+        robot.waitForIdle();
+        return rect.get();
+    }
+
+    private static void captureScreen() {
+        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
+        try {
+            ImageIO.write(
+                    robot.createScreenCapture(new Rectangle(0, 0,
+                            screenSize.width,
+                            screenSize.height)),
+                    "png",
+                    new File("screen1.png")
+            );
+        } catch (IOException ignore) {
+        }
+    }
+
+    private static void createUI() {
+        frame = new JFrame();
+        UIManager.put("SplitPaneDivider.draggingColor", EXPECTED_DRAG_COLOR);
+        JLabel l1 = new JLabel("LEFT  LABEL", JLabel.CENTER);
+        JLabel l2 = new JLabel("RIGHT LABEL", JLabel.CENTER);
+        pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, l1, l2);
+        frame.setSize(400, 400);
+        pane.setDividerSize(15);
+        pane.setDividerLocation(frame.getSize().width / 2);
+        frame.getContentPane().add(pane, BorderLayout.CENTER);
+        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;
+        }
+    }
+
+}