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Java > Open Source Codes > net > sf > jga > swing > spreadsheet > ComponentRenderer


1 // ============================================================================
2 // $Id: ComponentRenderer.java,v 1.2 2005/08/14 20:27:30 davidahall Exp $
3 // Copyright (c) 2005 David A. Hall
4 // ============================================================================
5 // The contents of this file are subject to the Common Development and
6 // Distribution License (CDDL), Version 1.0 (the License); you may not use this
7 // file except in compliance with the License. You should have received a copy
8 // of the the License along with this file: if not, a copy of the License is
9 // available from Sun Microsystems, Inc.
10 //
11 // http://www.sun.com/cddl/cddl.html
12 //
13 // From time to time, the license steward (initially Sun Microsystems, Inc.) may
14 // publish revised and/or new versions of the License. You may not use,
15 // distribute, or otherwise make this file available under subsequent versions
16 // of the License.
17 //
18 // Alternatively, the contents of this file may be used under the terms of the
19 // GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
20 // case the provisions of the LGPL are applicable instead of those above. If you
21 // wish to allow use of your version of this file only under the terms of the
22 // LGPL, and not to allow others to use your version of this file under the
23 // terms of the CDDL, indicate your decision by deleting the provisions above
24 // and replace them with the notice and other provisions required by the LGPL.
25 // If you do not delete the provisions above, a recipient may use your version
26 // of this file under the terms of either the CDDL or the LGPL.
27 //
28 // This library is distributed in the hope that it will be useful,
29 // but WITHOUT ANY WARRANTY; without even the implied warranty of
30 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
31 // ============================================================================
32
33 package net.sf.jga.swing.spreadsheet;
34
35 import java.awt.Component JavaDoc;
36 import javax.swing.JComponent JavaDoc;
37 import javax.swing.JTable JavaDoc;
38 import javax.swing.table.DefaultTableCellRenderer JavaDoc;
39 import javax.swing.table.TableCellRenderer JavaDoc;
40
41 /**
42  * TableCellRenderer used when the contents of the cell are a JComponent. The
43  * component itself will be used as the rendering component.
44  * <p>
45  * Copyright &copy; 2005 David A. Hall
46  */
47
48 public class ComponentRenderer extends DefaultTableCellRenderer JavaDoc implements TableCellRenderer JavaDoc {
49
50     static final long serialVersionUID = -700135148337938417L;
51
52     // default instance for general usage
53 static private ComponentRenderer _instance;
54
55     /**
56      * Returns a sharable ComponentRenderer instance.
57      */
58     static public synchronized ComponentRenderer getInstance() {
59         if (_instance == null)
60             _instance = new ComponentRenderer();
61
62         return _instance;
63     }
64
65     public ComponentRenderer () {}
66
67     // --------------------------------
68 // TableCellRenderer Implementation
69 // --------------------------------
70
71     /**
72      * Returns the Component that is stored in the table at the designated cell.
73      */
74     public Component JavaDoc getTableCellRendererComponent(JTable JavaDoc table, Object JavaDoc object, boolean isSelected,
75                                                    boolean hasFocus, int row, int col)
76     {
77         if(object instanceof JComponent JavaDoc) {
78             return (JComponent JavaDoc) object;
79         }
80
81         // Rather than throw an exception because we're used improperly,
82 // fall back to default table behaviour.
83 return super.getTableCellRendererComponent(table, object, isSelected, hasFocus, row, col);
84     }
85 }
86
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