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Java > Open Source Codes > net > sf > jga > swing > GenericListCellRenderer


1 // ============================================================================
2 // $Id: GenericListCellRenderer.java,v 1.11 2005/08/31 14:15:27 davidahall Exp $
3 // Copyright (c) 2003-2005 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 package net.sf.jga.swing;
33
34 import java.awt.Color JavaDoc;
35 import java.awt.Component JavaDoc;
36 import javax.swing.DefaultListCellRenderer JavaDoc;
37 import javax.swing.Icon JavaDoc;
38 import javax.swing.JLabel JavaDoc;
39 import javax.swing.JList JavaDoc;
40 import net.sf.jga.fn.UnaryFunctor;
41 import net.sf.jga.fn.string.DefaultFormat;
42 import net.sf.jga.util.Formattable;
43
44 /**
45  * ListCellRenderer that passes the contents through a functor to render the
46  * contents, instead of calling toString() on the contents. The functor must
47  * take an argument of some type T and return a string.
48  * <p>
49  * Copyright &copy; 2002-2005 David A. Hall
50  *
51  * @author <a HREF="mailto:davidahall@users.sf.net">David A. Hall</a>
52  */
53
54 public class GenericListCellRenderer<T> extends DefaultListCellRenderer JavaDoc implements Formattable<T> {
55
56     static final long serialVersionUID = -8781266653605837205L;
57
58     private UnaryFunctor<T,String JavaDoc> _uf;
59
60     public GenericListCellRenderer() {
61         this(new DefaultFormat<T>());
62     }
63     
64     public GenericListCellRenderer (UnaryFunctor<T,String JavaDoc> uf) {
65         if (uf == null) {
66             throw new IllegalArgumentException JavaDoc("Non-null functor required");
67         }
68         
69         _uf = uf;
70     }
71     
72
73     public Component JavaDoc getListCellRendererComponent(JList JavaDoc list, Object JavaDoc value, int idx,
74                                                   boolean sel, boolean focus)
75     {
76         Component JavaDoc comp = super.getListCellRendererComponent(list, value, idx, sel, focus);
77         if (comp instanceof JLabel JavaDoc && ! (value instanceof Icon JavaDoc)) {
78             // @SuppressWarnings
79 //
80 ((JLabel JavaDoc) comp).setText(_uf.fn((T)value));
81         }
82
83         return comp;
84     }
85     
86     // ---------------------
87 // Formattable interface
88 // ---------------------
89
90     /**
91      * Changes the format of an existing renderer
92      */
93     public void setFormat(UnaryFunctor<T,String JavaDoc> formatter) {
94         if (formatter == null) {
95             throw new IllegalArgumentException JavaDoc("Non-null functor required");
96         }
97         
98         _uf = formatter;
99     }
100 }
101
102
103
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