8028995: Write regression test for JDK-8016356

Reviewed-by: serb, anthony

test/javax/swing/JFrame/8016356/bug8016356.java

+/*
+ * Copyright (c) 2013, 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 8016356
+   @summary Any swing frame resizes ugly.
+   @run main bug8016356
+   @author Oleg Pekhovskiy
+*/
+
+import java.awt.AWTException;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsEnvironment;
+import java.awt.Insets;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Robot;
+import java.awt.Toolkit;
+import java.awt.event.InputEvent;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.SwingUtilities;
+import sun.awt.OSInfo;
+
+public class bug8016356 {
+    private static JFrame frame;
+    private static Color color;
+    private static int scrTop;
+
+    private static Point frLoc;
+    private static Dimension frSize;
+
+    public static void main(String[] args) throws Exception {
+
+        // Windows only test
+        if (OSInfo.getOSType() == OSInfo.OSType.WINDOWS) {
+
+            // Retrieving top edge of Desktop
+            GraphicsConfiguration grConf = GraphicsEnvironment
+                    .getLocalGraphicsEnvironment().getDefaultScreenDevice()
+                    .getDefaultConfiguration();
+            Rectangle scrRect = grConf.getBounds();
+            Insets scrInsets = Toolkit.getDefaultToolkit().getScreenInsets(grConf);
+            scrTop = scrRect.y + scrInsets.top;
+
+            color = new Color(0, 255, 0);
+
+            SwingUtilities.invokeAndWait(() -> {
+                createAndShowUI();
+            });
+
+            try {
+                Robot robot = new Robot();
+                robot.setAutoDelay(500);
+                robot.setAutoWaitForIdle(true);
+                robot.delay(1000);
+
+                // Resizing a window to invoke Windows Snap feature
+                readFrameInfo();
+                robot.mouseMove(frLoc.x + frSize.width / 2, frLoc.y);
+                robot.mousePress(InputEvent.BUTTON1_MASK);
+                robot.mouseMove(frLoc.x + frSize.width / 2, scrTop);
+                robot.mouseRelease(InputEvent.BUTTON1_MASK);
+
+                // Retrieving the color of window expanded area
+                readFrameInfo();
+                Insets insets = frame.getInsets();
+                Color bgColor = robot.getPixelColor(frLoc.x + frSize.width / 2,
+                        frLoc.y + frSize.height - insets.bottom - 1);
+
+                frame.dispose();
+
+                if (!bgColor.equals(color)) {
+                    throw new RuntimeException("TEST FAILED: got "
+                            + bgColor + " instead of " + color);
+                }
+                System.out.println("TEST PASSED!");
+            } catch (AWTException ex) {
+                throw new RuntimeException("TEST FAILED!");
+            }
+        }
+    }
+
+    private static void createAndShowUI() {
+        frame = new JFrame();
+        frame.setBounds(10, scrTop + 10, 300, 100);
+        JPanel panel = new JPanel();
+        panel.setBackground(color);
+        frame.getContentPane().add(panel);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setVisible(true);
+    }
+
+    private static void readFrameInfo() throws Exception {
+        SwingUtilities.invokeAndWait(() -> {
+            frLoc = frame.getLocationOnScreen();
+            frSize = frame.getSize();
+        });
+    }
+}