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


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.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
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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16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
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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".
32  *
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.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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48  * SUCH DAMAGE.
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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.Color JavaDoc;
59 import java.awt.Component JavaDoc;
60 import java.awt.event.ActionEvent JavaDoc;
61 import java.awt.event.ActionListener JavaDoc;
62
63 import javax.swing.JComboBox JavaDoc;
64 import javax.swing.JComponent JavaDoc;
65
66 import org.objectstyle.cayenne.modeler.dialog.validator.ValidatorDialog;
67 import org.objectstyle.cayenne.validation.ValidationException;
68
69 /**
70  * @author Andrei Adamchik
71  */
72 public class ComboSelectionBinding extends BindingBase {
73
74     protected JComboBox JavaDoc comboBox;
75
76     protected Color JavaDoc defaultBGColor;
77     protected Color JavaDoc errorColor;
78     protected String JavaDoc defaultToolTip;
79     protected String JavaDoc noSelectionValue;
80
81     /**
82      * Binds to update model for a combo box selection events. For editable combo boxes
83      * model is updated whenever a new value is entered.
84      */
85     public ComboSelectionBinding(JComboBox JavaDoc comboBox, String JavaDoc expression,
86             String JavaDoc noSelectionValue) {
87         super(expression);
88         this.comboBox = comboBox;
89         this.noSelectionValue = noSelectionValue;
90
91         comboBox.addActionListener(new ActionListener JavaDoc() {
92
93             public void actionPerformed(ActionEvent JavaDoc e) {
94                 if (!modelUpdateDisabled) {
95                     updateModel();
96                 }
97             }
98         });
99
100         // init error colors
101 initComponentDefaults();
102     }
103
104     protected void initComponentDefaults() {
105         this.errorColor = ValidatorDialog.WARNING_COLOR;
106
107         if (comboBox.getEditor() != null) {
108
109             Component JavaDoc editor = comboBox.getEditor().getEditorComponent();
110             if (editor instanceof JComponent JavaDoc) {
111                 JComponent JavaDoc jEditor = (JComponent JavaDoc) editor;
112                 this.defaultBGColor = jEditor.getBackground();
113                 this.defaultToolTip = jEditor.getToolTipText();
114             }
115         }
116     }
117
118     public void updateView() {
119         Object JavaDoc value = getValue();
120         modelUpdateDisabled = true;
121         try {
122             clear();
123             if (value != null) {
124                 this.comboBox.setSelectedItem(value.toString());
125             }
126             else if (noSelectionValue != null) {
127                 this.comboBox.setSelectedItem(noSelectionValue);
128             }
129             else {
130                 this.comboBox.setSelectedIndex(-1);
131             }
132         }
133         finally {
134             modelUpdateDisabled = false;
135         }
136     }
137
138     protected void updateModel() {
139         try {
140             Object JavaDoc value = comboBox.getSelectedItem();
141             if (noSelectionValue != null && noSelectionValue.equals(value)) {
142                 value = null;
143             }
144             setValue(value);
145             clear();
146         }
147         catch (ValidationException vex) {
148             initWarning(vex.getLocalizedMessage());
149         }
150     }
151
152     public Component JavaDoc getView() {
153         return comboBox;
154     }
155
156     protected void clear() {
157         if (comboBox.getEditor() != null) {
158
159             Component JavaDoc editor = comboBox.getEditor().getEditorComponent();
160             if (editor instanceof JComponent JavaDoc) {
161                 JComponent JavaDoc jEditor = (JComponent JavaDoc) editor;
162                 jEditor.setBackground(defaultBGColor);
163                 jEditor.setToolTipText(defaultToolTip);
164             }
165         }
166     }
167
168     protected void initWarning(String JavaDoc message) {
169         if (comboBox.getEditor() != null) {
170
171             Component JavaDoc editor = comboBox.getEditor().getEditorComponent();
172             if (editor instanceof JComponent JavaDoc) {
173                 JComponent JavaDoc jEditor = (JComponent JavaDoc) editor;
174                 jEditor.setBackground(errorColor);
175                 jEditor.setToolTipText(message);
176             }
177         }
178     }
179 }
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