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.
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  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         try {
  52             UIManager.setLookAndFeel(new WindowsLookAndFeel());
  53         } catch (javax.swing.UnsupportedLookAndFeelException ulafe) {
  54             System.out.println(ulafe.getMessage());
  55             System.out.println("The test is considered PASSED");
  56             return;
  57         }
  58         SwingUtilities.invokeAndWait(new Runnable() {
  59 
  60             @Override
  61             public void run() {
  62                 createAndShowGUI();
  63             }
  64         });
  65 
  66         toolkit.realSync();
  67 
  68         Point point = Util.invokeOnEDT(new Callable<Point>() {
  69 
  70             @Override
  71             public Point call() throws Exception {
  72                 Rectangle rect = tree.getRowBounds(2);
  73                 Point p = new Point(rect.x + rect.width / 2, rect.y + rect.height / 2);
  74                 SwingUtilities.convertPointToScreen(p, tree);
  75                 return p;
  76             }
  77         });
  78 
  79         robot.mouseMove(point.x, point.y);
  80         robot.mousePress(InputEvent.BUTTON1_MASK);
  81         robot.mouseRelease(InputEvent.BUTTON1_MASK);
  82         robot.mousePress(InputEvent.BUTTON1_MASK);
  83         robot.mouseRelease(InputEvent.BUTTON1_MASK);
  84         toolkit.realSync();
  85 
  86     }
  87 
  88     private static void createAndShowGUI() {
  89         JFrame frame = new JFrame();
  90         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  91 
  92         DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
  93         root.add(new DefaultMutableTreeNode("colors"));
  94         DefaultMutableTreeNode sports = new DefaultMutableTreeNode("sports");
  95         sports.add(new DefaultMutableTreeNode("basketball"));
  96         sports.add(new DefaultMutableTreeNode("football"));
  97         root.add(sports);
  98 
  99         tree = new JTree(root);
 100         tree.setUI(new NullReturningTreeUI());
 101 
 102         frame.getContentPane().add(tree);
 103         frame.pack();
 104         frame.setVisible(true);
 105 
 106     }
 107 
 108     private static final class NullReturningTreeUI extends WindowsTreeUI {
 109 
 110         @Override
 111         public Rectangle getPathBounds(JTree tree, TreePath path) {
 112             // the method can return null and callers have to be ready for
 113             // that. Simulate the case by returning null for unknown reason.
 114             if (path != null && path.toString().contains("football")) {
 115                 return null;
 116             }
 117 
 118             return super.getPathBounds(tree, path);
 119         }
 120     }
 121 }