NoCollapsingRootExpansionListener


1   /* -*- Mode: JDE; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2    *
3    * This file is part of the debugger and core tools for the AspectJ(tm)
4    * programming language; see http://aspectj.org
5    *
6    * The contents of this file are subject to the Mozilla Public License
7    * Version 1.1 (the "License"); you may not use this file except in
8    * compliance with the License. You may obtain a copy of the License at
9    * either http://www.mozilla.org/MPL/ or http://aspectj.org/MPL/.
10   *
11   * Software distributed under the License is distributed on an "AS IS" basis,
12   * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13   * for the specific language governing rights and limitations under the
14   * License.
15   *
16   * The Original Code is AspectJ.
17   *
18   * The Initial Developer of the Original Code is Xerox Corporation. Portions
19   * created by Xerox Corporation are Copyright (C) 1999-2002 Xerox Corporation.
20   * All Rights Reserved.
21   */
22  
23  package org.aspectj.debugger.gui;
24  
25  import javax.swing.JTree  ;
26  import javax.swing.event.TreeWillExpandListener  ;
27  import javax.swing.event.TreeExpansionEvent  ;
28  import javax.swing.tree.TreePath  ;
29  import javax.swing.tree.ExpandVetoException  ;
30  
31  class NoCollapsingRootExpansionListener implements TreeWillExpandListener   {
32  
33      private JTree   tree;
34  
35      public NoCollapsingRootExpansionListener(JTree   tree) {
36          this.tree = tree;
37      }
38      
39      public void treeWillCollapse(TreeExpansionEvent   event) throws ExpandVetoException   {
40          TreePath   path = event.getPath();
41          Object   root = tree.getModel().getRoot();
42          Object   first = path.getPathComponent(0);
43          Object   last = path.getLastPathComponent();
44          if (last.equals(root)) {
45              throw new ExpandVetoException  (event);
46          }
47      }
48  
49      public void treeWillExpand(TreeExpansionEvent   event) {
50      }
51  }
52
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