1 /* 2 * Copyright (c) 2016, 2017, 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 /** 25 * @test 26 * @key headful 27 * @bug 8160246 28 * @summary Regression: 4410243 reproducible with GTK LaF 29 * @run main ScrollFlickerTest 30 */ 31 32 import javax.swing.*; 33 import java.awt.*; 34 35 public class ScrollFlickerTest { 36 37 private static JFrame frame; 38 private static JScrollPane scroll; 39 private static int cnt = 0; 40 41 public static void main(String[] args) throws Exception { 42 SwingUtilities.invokeAndWait(() -> { 43 frame = new JFrame(); 44 frame.setSize(300, 200); 45 frame.getContentPane().setLayout(null); 46 JTextArea text = new JTextArea("Test test test test"); 47 text.setLineWrap(true); 48 scroll = new JScrollPane(text); 49 frame.getContentPane().add(scroll); 50 scroll.setBounds(1, 1, 100, 50); 51 frame.setVisible(true); 52 }); 53 54 Robot robot = new Robot(); 55 robot.waitForIdle(); 56 robot.delay(200); 57 58 SwingUtilities.invokeAndWait(() -> { 59 Insets insets = scroll.getInsets(); 60 scroll.setSize(insets.left + insets.right + 61 scroll.getVerticalScrollBar().getPreferredSize().width, 50); 62 scroll.revalidate(); 63 }); 64 robot.delay(200); 65 SwingUtilities.invokeAndWait(() -> 66 scroll.getViewport().addChangeListener((e) -> cnt++)); 67 robot.delay(1000); 68 69 SwingUtilities.invokeLater(frame::dispose); 70 71 if (cnt > 0) { 72 throw new RuntimeException("Scroll bar flickers"); 73 } 74 } 75 }