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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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   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).
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  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
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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  * @modules java.desktop/com.sun.java.swing.plaf.windows
  31  * @build Util
  32  * @run main bug8004298
  33  */
  34 
  35 import java.awt.*;
  36 import java.awt.event.InputEvent;
  37 import javax.swing.*;
  38 import javax.swing.tree.*;
  39 import java.util.concurrent.Callable;
  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         try {
  51             UIManager.setLookAndFeel(new WindowsLookAndFeel());
  52         } catch (javax.swing.UnsupportedLookAndFeelException ulafe) {
  53             System.out.println(ulafe.getMessage());
  54             System.out.println("The test is considered PASSED");
  55             return;
  56         }
  57         SwingUtilities.invokeAndWait(new Runnable() {
  58 
  59             @Override
  60             public void run() {
  61                 createAndShowGUI();
  62             }
  63         });
  64 
  65         robot.waitForIdle();
  66 
  67         Point point = Util.invokeOnEDT(new Callable<Point>() {
  68 
  69             @Override
  70             public Point call() throws Exception {
  71                 Rectangle rect = tree.getRowBounds(2);
  72                 Point p = new Point(rect.x + rect.width / 2, rect.y + rect.height / 2);
  73                 SwingUtilities.convertPointToScreen(p, tree);
  74                 return p;
  75             }
  76         });
  77 
  78         robot.mouseMove(point.x, point.y);
  79         robot.mousePress(InputEvent.BUTTON1_MASK);
  80         robot.mouseRelease(InputEvent.BUTTON1_MASK);
  81         robot.mousePress(InputEvent.BUTTON1_MASK);
  82         robot.mouseRelease(InputEvent.BUTTON1_MASK);
  83         robot.waitForIdle();
  84 
  85     }
  86 
  87     private static void createAndShowGUI() {
  88         JFrame frame = new JFrame();
  89         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  90 
  91         DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
  92         root.add(new DefaultMutableTreeNode("colors"));
  93         DefaultMutableTreeNode sports = new DefaultMutableTreeNode("sports");
  94         sports.add(new DefaultMutableTreeNode("basketball"));
  95         sports.add(new DefaultMutableTreeNode("football"));
  96         root.add(sports);
  97 
  98         tree = new JTree(root);
  99         tree.setUI(new NullReturningTreeUI());
 100 
 101         frame.getContentPane().add(tree);
 102         frame.pack();
 103         frame.setVisible(true);
 104 
 105     }
 106 
 107     private static final class NullReturningTreeUI extends WindowsTreeUI {
 108 
 109         @Override
 110         public Rectangle getPathBounds(JTree tree, TreePath path) {
 111             // the method can return null and callers have to be ready for
 112             // that. Simulate the case by returning null for unknown reason.
 113             if (path != null && path.toString().contains("football")) {
 114                 return null;
 115             }
 116 
 117             return super.getPathBounds(tree, path);
 118         }
 119     }
 120 }