1 /*

     2  * Copyright (c) 2013, 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  * @bug 8004298

    27  * @summary NPE in WindowsTreeUI.ensureRowsAreVisible

    28  * @author Alexander Scherbatiy

    29  * @library ../../regtesthelpers

    30  * @build Util

    31  * @run main bug8004298

    32  */

    33 

    34 import java.awt.*;

    35 import java.awt.event.InputEvent;

    36 import javax.swing.*;

    37 import javax.swing.tree.*;

    38 import java.util.concurrent.Callable;

    39 import sun.awt.SunToolkit;

    40 import com.sun.java.swing.plaf.windows.WindowsLookAndFeel;

    41 import com.sun.java.swing.plaf.windows.WindowsTreeUI;

    42 

    43 public class bug8004298 {

    44 

    45     private static JTree tree;

    46 

    47     public static void main(String[] args) throws Exception {

    48         Robot robot = new Robot();

    49         robot.setAutoDelay(50);

    50         SunToolkit toolkit = (SunToolkit) Toolkit.getDefaultToolkit();

    51         UIManager.setLookAndFeel(new WindowsLookAndFeel());

    52 

    53         SwingUtilities.invokeAndWait(new Runnable() {

    54 

    55             @Override

    56             public void run() {

    57                 createAndShowGUI();

    58             }

    59         });

    60 

    61         toolkit.realSync();

    62 

    63         Point point = Util.invokeOnEDT(new Callable<Point>() {

    64 

    65             @Override

    66             public Point call() throws Exception {

    67                 Rectangle rect = tree.getRowBounds(2);

    68                 Point p = new Point(rect.x + rect.width / 2, rect.y + rect.height / 2);

    69                 SwingUtilities.convertPointToScreen(p, tree);

    70                 return p;

    71             }

    72         });

    73 

    74         robot.mouseMove(point.x, point.y);

    75         robot.mousePress(InputEvent.BUTTON1_MASK);

    76         robot.mouseRelease(InputEvent.BUTTON1_MASK);

    77         robot.mousePress(InputEvent.BUTTON1_MASK);

    78         robot.mouseRelease(InputEvent.BUTTON1_MASK);

    79         toolkit.realSync();

    80 

    81     }

    82 

    83     private static void createAndShowGUI() {

    84         JFrame frame = new JFrame();

    85         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    86 

    87         DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");

    88         root.add(new DefaultMutableTreeNode("colors"));

    89         DefaultMutableTreeNode sports = new DefaultMutableTreeNode("sports");

    90         sports.add(new DefaultMutableTreeNode("basketball"));

    91         sports.add(new DefaultMutableTreeNode("football"));

    92         root.add(sports);

    93 

    94         tree = new JTree(root);

    95         tree.setUI(new NullReturningTreeUI());

    96 

    97         frame.getContentPane().add(tree);

    98         frame.pack();

    99         frame.setVisible(true);

   100 

   101     }

   102 

   103     private static final class NullReturningTreeUI extends WindowsTreeUI {

   104 

   105         @Override

   106         public Rectangle getPathBounds(JTree tree, TreePath path) {

   107             // the method can return null and callers have to be ready for

   108             // that. Simulate the case by returning null for unknown reason.

   109             if (path != null && path.toString().contains("football")) {

   110                 return null;

   111             }

   112 

   113             return super.getPathBounds(tree, path);

   114         }

   115     }

   116 }