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Java > Open Source Codes > org > objectstyle > cayenne > swing > ItemEventBinding


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
5  *
6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
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10  * modification, are permitted provided that the following conditions
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13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
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17  * notice, this list of conditions and the following disclaimer in
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21  * 3. The end-user documentation included with the redistribution, if any,
22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
30  * permission. For written permission, email
31  * "andrus at objectstyle dot org".
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33  * 5. Products derived from this software may not be called "ObjectStyle"
34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
35  * names without prior written permission.
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37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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51  * This software consists of voluntary contributions made by many
52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */
56 package org.objectstyle.cayenne.swing;
57
58 import java.awt.Component JavaDoc;
59 import java.awt.event.ItemEvent JavaDoc;
60 import java.awt.event.ItemListener JavaDoc;
61
62 import javax.swing.AbstractButton JavaDoc;
63
64 /**
65  * Binds a checkbox state to an int or boolean property.
66  *
67  * @author Andrei Adamchik
68  */
69 public class ItemEventBinding extends BindingBase {
70
71     protected AbstractButton JavaDoc boundItem;
72
73     public ItemEventBinding(AbstractButton JavaDoc boundItem, String JavaDoc expression) {
74         super(expression);
75         this.boundItem = boundItem;
76
77         boundItem.addItemListener(new ItemListener JavaDoc() {
78
79             public void itemStateChanged(ItemEvent JavaDoc e) {
80                 updateModel();
81             }
82         });
83     }
84
85     public Component JavaDoc getView() {
86         return boundItem;
87     }
88
89     public void updateView() {
90         Object JavaDoc value = getValue();
91         boolean b = false;
92
93         // convert to boolean
94 if (value != null) {
95             if (value instanceof Boolean JavaDoc) {
96                 b = ((Boolean JavaDoc) value).booleanValue();
97             }
98             else if (value instanceof Number JavaDoc) {
99                 b = ((Number JavaDoc) value).intValue() != 0;
100             }
101         }
102
103         modelUpdateDisabled = true;
104         try {
105             boundItem.setSelected(b);
106         }
107         finally {
108             modelUpdateDisabled = false;
109         }
110     }
111
112     protected void updateModel() {
113         setValue(boundItem.isSelected() ? Boolean.TRUE : Boolean.FALSE);
114     }
115 }
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