1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package javax.swing.plaf.basic;
26
27 import javax.swing.ComboBoxEditor;
28 import javax.swing.JTextField;
29 import javax.swing.border.Border;
30 import java.awt.Component;
31 import java.awt.event.*;
32
33 import java.lang.reflect.Method;
34
35 /**
36 * The default editor for editable combo boxes. The editor is implemented as a JTextField.
37 *
38 * @author Arnaud Weber
39 * @author Mark Davidson
40 */
41 public class BasicComboBoxEditor implements ComboBoxEditor,FocusListener {
42 protected JTextField editor;
43 private Object oldValue;
44
45 public BasicComboBoxEditor() {
46 editor = createEditorComponent();
47 }
48
49 public Component getEditorComponent() {
50 return editor;
51 }
52
53 /**
54 * Creates the internal editor component. Override this to provide
55 * a custom implementation.
56 *
57 * @return a new editor component
58 * @since 1.6
59 */
60 protected JTextField createEditorComponent() {
61 JTextField editor = new BorderlessTextField("",9);
62 editor.setBorder(null);
63 return editor;
64 }
65
66 /**
67 * Sets the item that should be edited.
68 *
69 * @param anObject the displayed value of the editor
70 */
71 public void setItem(Object anObject) {
72 String text;
73
74 if ( anObject != null ) {
75 text = anObject.toString();
76 if (text == null) {
77 text = "";
78 }
79 oldValue = anObject;
80 } else {
81 text = "";
82 }
83 // workaround for 4530952
84 if (! text.equals(editor.getText())) {
85 editor.setText(text);
86 }
87 }
88
89 public Object getItem() {
90 Object newValue = editor.getText();
91
92 if (oldValue != null && !(oldValue instanceof String)) {
93 // The original value is not a string. Should return the value in it's
94 // original type.
95 if (newValue.equals(oldValue.toString())) {
96 return oldValue;
97 } else {
98 // Must take the value from the editor and get the value and cast it to the new type.
99 Class<?> cls = oldValue.getClass();
100 try {
101 Method method = cls.getMethod("valueOf", new Class[]{String.class});
102 newValue = method.invoke(oldValue, new Object[] { editor.getText()});
103 } catch (Exception ex) {
104 // Fail silently and return the newValue (a String object)
105 }
106 }
107 }
108 return newValue;
109 }
110
111 public void selectAll() {
112 editor.selectAll();
113 editor.requestFocus();
114 }
115
116 // This used to do something but now it doesn't. It couldn't be
117 // removed because it would be an API change to do so.
118 public void focusGained(FocusEvent e) {}
119
120 // This used to do something but now it doesn't. It couldn't be
121 // removed because it would be an API change to do so.
122 public void focusLost(FocusEvent e) {}
123
124 public void addActionListener(ActionListener l) {
125 editor.addActionListener(l);
126 }
127
128 public void removeActionListener(ActionListener l) {
129 editor.removeActionListener(l);
130 }
131
132 @SuppressWarnings("serial") // Superclass is not serializable across versions
133 static class BorderlessTextField extends JTextField {
134 public BorderlessTextField(String value,int n) {
135 super(value,n);
136 }
137
138 // workaround for 4530952
139 public void setText(String s) {
140 if (getText().equals(s)) {
141 return;
142 }
143 super.setText(s);
144 }
145
146 public void setBorder(Border b) {
147 if (!(b instanceof UIResource)) {
148 super.setBorder(b);
149 }
150 }
151 }
152
153 /**
154 * A subclass of BasicComboBoxEditor that implements UIResource.
155 * BasicComboBoxEditor doesn't implement UIResource
156 * directly so that applications can safely override the
157 * cellRenderer property with BasicListCellRenderer subclasses.
158 * <p>
159 * <strong>Warning:</strong>
160 * Serialized objects of this class will not be compatible with
161 * future Swing releases. The current serialization support is
162 * appropriate for short term storage or RMI between applications running
163 * the same version of Swing. As of 1.4, support for long term storage
164 * of all JavaBeans™
165 * has been added to the <code>java.beans</code> package.
166 * Please see {@link java.beans.XMLEncoder}.
167 */
168 @SuppressWarnings("serial") // Same-version serialization only
169 public static class UIResource extends BasicComboBoxEditor
170 implements javax.swing.plaf.UIResource {
171 }
172 }