1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* @test 25 * @bug 8160246 26 * @summary Regression: 4410243 reproducible with GTK LaF 27 * @run main ScrollFlickerTest 28 */ 29 30 import javax.swing.*; 31 import java.awt.*; 32 33 public class ScrollFlickerTest { 34 35 private static JFrame frame; 36 private static JScrollPane scroll; 37 private static int cnt = 0; 38 39 public static void main(String[] args) throws Exception { 40 SwingUtilities.invokeAndWait(() -> { 41 frame = new JFrame(); 42 frame.setSize(300, 200); 43 frame.getContentPane().setLayout(null); 44 JTextArea text = new JTextArea("Test test test test"); 45 text.setLineWrap(true); 46 scroll = new JScrollPane(text); 47 frame.getContentPane().add(scroll); 48 scroll.setBounds(1, 1, 100, 50); 49 frame.setVisible(true); 50 }); 51 52 Robot robot = new Robot(); 53 robot.waitForIdle(); 54 robot.delay(200); 55 56 SwingUtilities.invokeAndWait(() -> { 57 Insets insets = scroll.getInsets(); 58 scroll.setSize(insets.left + insets.right + 59 scroll.getVerticalScrollBar().getPreferredSize().width, 50); 60 scroll.revalidate(); 61 }); 62 robot.delay(200); 63 SwingUtilities.invokeAndWait(() -> 64 scroll.getViewport().addChangeListener((e) -> cnt++)); 65 robot.delay(1000); 66 67 SwingUtilities.invokeLater(frame::dispose); 68 69 if (cnt > 0) { 70 throw new RuntimeException("Scroll bar flickers"); 71 } 72 } 73 }