1 /*
   2  * Copyright (c) 2009, 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  * @test
  25  * @bug 8178430
  26  * @summary JMenu in GridBagLayout flickers when label text shows "..." and
  27  * is updated
  28  * @run main LabelDotTest
  29  */
  30 import java.awt.Dimension;
  31 import java.awt.GridBagConstraints;
  32 import java.awt.GridBagLayout;
  33 import java.awt.Robot;
  34 
  35 import java.util.stream.IntStream;
  36 
  37 import javax.swing.SwingUtilities;
  38 import javax.swing.JLabel;
  39 import javax.swing.JMenu;
  40 import javax.swing.JFrame;
  41 import javax.swing.JMenuBar;
  42 import javax.swing.JPanel;
  43 import javax.swing.SwingConstants;
  44 
  45 public class LabelDotTest
  46 {
  47     private final static String longText = "show a very long text to have it " +
  48             "automatically shortened";
  49     private final static String shortText = "show short text";
  50 
  51     private static JFrame frame;
  52     private static JLabel label;
  53     private static JMenu menu;
  54     private static volatile boolean isException = false;
  55 
  56     private static void createUI() {
  57        System.out.println("BEFORE CREATION");
  58        frame = new JFrame();
  59        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  60        frame.setSize(new Dimension(50, 150));
  61        frame.setLocationRelativeTo(null);
  62 
  63        frame.setLayout(new GridBagLayout());
  64        GridBagConstraints c = new GridBagConstraints();
  65        c.fill = GridBagConstraints.BOTH;
  66        c.weightx = 1.0;
  67        c.weighty = 0.0;
  68        c.gridwidth = GridBagConstraints.REMAINDER;
  69 
  70        JMenuBar menuBar = new JMenuBar();
  71        menu = new JMenu("Menu");
  72        menuBar.add(menu);
  73        frame.add(menuBar, c);
  74 
  75        frame.add(new JLabel("Title", SwingConstants.CENTER), c);
  76 
  77        c.weighty = 1.0;
  78        frame.add(new JPanel(new GridBagLayout()), c);
  79        c.weighty = 0.0;
  80 
  81        label = new JLabel(shortText);
  82        frame.add(label, c);
  83 
  84        frame.setVisible(true);
  85    }
  86 
  87    private static void runTest(int iterations) throws Exception{
  88         Robot robot = new Robot();
  89 
  90         IntStream.range(0, iterations).forEach((i) -> {
  91                 SwingUtilities.invokeLater(() -> {
  92                     if (label.getText().equals(shortText)) {
  93                         label.setText(longText);
  94                     } else {
  95                         label.setText(shortText);
  96                     }
  97                     /*  For a top level menu item, minimum size and the
  98                         preferred size should be the same, and should not be
  99                         equal to 1. Save the exception state and throw later
 100                         once the iterations are completed.
 101                     */
 102                     isException = (menu.getMinimumSize().height == 1 &&
 103                         !menu.getMinimumSize().equals(menu.getPreferredSize())) ||
 104                         isException;
 105                 });
 106                 robot.waitForIdle();
 107         });
 108    }
 109 
 110    public static void main(String[] args) throws Exception {
 111         try {
 112             SwingUtilities.invokeAndWait(() -> createUI());
 113             runTest(50);
 114         } finally {
 115             SwingUtilities.invokeAndWait(() -> frame.dispose());
 116             if (isException)
 117                 throw new RuntimeException("Size of Menu bar is not correct.");
 118         }
 119    }
 120 }