1/*
2 * Copyright (c) 2012, 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 6505523
28 * @summary NullPointerException in BasicTreeUI when a node is removed by expansion listener
29 * @author Alexandr Scherbatiy
30 * @run main bug6505523
31 */
32import java.awt.Point;
33import java.awt.Rectangle;
34import java.awt.Robot;
35import java.awt.event.InputEvent;
36import javax.swing.JFrame;
37import javax.swing.JScrollPane;
38import javax.swing.JTree;
39import javax.swing.SwingUtilities;
40import javax.swing.event.TreeExpansionEvent;
41import javax.swing.event.TreeExpansionListener;
42import javax.swing.tree.DefaultMutableTreeNode;
43import javax.swing.tree.DefaultTreeModel;
44import javax.swing.tree.TreeNode;
45
46public class bug6505523 {
47
48    private static JTree tree;
49
50    public static void main(String[] args) throws Exception {
51        Robot robot = new Robot();
52        robot.setAutoDelay(50);
53
54        SwingUtilities.invokeAndWait(new Runnable() {
55
56            @Override
57            public void run() {
58                createAndShowGUI();
59            }
60        });
61
62        robot.waitForIdle();
63
64        Point point = getRowPointToClick(2);
65        robot.mouseMove(point.x, point.y);
66        robot.mousePress(InputEvent.BUTTON1_MASK);
67        robot.mouseRelease(InputEvent.BUTTON1_MASK);
68
69        robot.waitForIdle();
70
71    }
72
73    private static Point getRowPointToClick(final int row) throws Exception {
74
75        final Point[] result = new Point[1];
76
77        SwingUtilities.invokeAndWait(new Runnable() {
78
79            @Override
80            public void run() {
81                Rectangle rect = tree.getRowBounds(row);
82                Point point = new Point(rect.x - 5, rect.y + rect.height / 2);
83                SwingUtilities.convertPointToScreen(point, tree);
84                result[0] = point;
85            }
86        });
87
88        return result[0];
89    }
90
91    private static void createAndShowGUI() {
92        final DefaultMutableTreeNode root = new DefaultMutableTreeNode("Problem with NPE under JDK 1.6");
93        final DefaultMutableTreeNode problematic = new DefaultMutableTreeNode("Expand me and behold a NPE in stderr");
94        problematic.add(new DefaultMutableTreeNode("some content"));
95        root.add(new DefaultMutableTreeNode("irrelevant..."));
96        root.add(problematic);
97
98        final DefaultTreeModel model = new DefaultTreeModel(root);
99        tree = new JTree(model);
100        tree.setRootVisible(true);
101        tree.setShowsRootHandles(true);
102        tree.expandRow(0);
103        tree.collapseRow(2);
104
105        // this is critical - without dragEnabled everything works
106        tree.setDragEnabled(true);
107
108        tree.addTreeExpansionListener(new TreeExpansionListener() {
109
110            @Override
111            public void treeExpanded(TreeExpansionEvent event) {
112                TreeNode parent = problematic.getParent();
113                if (parent instanceof DefaultMutableTreeNode) {
114                    model.removeNodeFromParent(problematic);
115                }
116            }
117
118            @Override
119            public void treeCollapsed(TreeExpansionEvent event) {
120            }
121        });
122
123        JFrame frame = new JFrame("JTree Problem");
124        frame.add(new JScrollPane(tree));
125        frame.setSize(500, 300);
126        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
127        frame.setLocationRelativeTo(null);
128        frame.setVisible(true);
129    }
130}
131