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 import sun.reflect.misc.MethodUtil;
36
37 /**
38 * The default editor for editable combo boxes. The editor is implemented as a JTextField.
39 *
40 * @author Arnaud Weber
41 * @author Mark Davidson
42 */
43 public class BasicComboBoxEditor implements ComboBoxEditor,FocusListener {
44 protected JTextField editor;
45 private Object oldValue;
46
47 public BasicComboBoxEditor() {
48 editor = createEditorComponent();
49 }
50
51 public Component getEditorComponent() {
52 return editor;
53 }
54
55 /**
56 * Creates the internal editor component. Override this to provide
57 * a custom implementation.
58 *
59 * @return a new editor component
60 * @since 1.6
61 */
62 protected JTextField createEditorComponent() {
63 JTextField editor = new BorderlessTextField("",9);
64 editor.setBorder(null);
65 return editor;
66 }
67
68 /**
69 * Sets the item that should be edited.
70 *
71 * @param anObject the displayed value of the editor
72 */
73 public void setItem(Object anObject) {
74 String text;
75
76 if ( anObject != null ) {
77 text = anObject.toString();
78 if (text == null) {
79 text = "";
80 }
81 oldValue = anObject;
82 } else {
83 text = "";
84 }
85 // workaround for 4530952
86 if (! text.equals(editor.getText())) {
87 editor.setText(text);
88 }
89 }
90
91 public Object getItem() {
92 Object newValue = editor.getText();
93
94 if (oldValue != null && !(oldValue instanceof String)) {
95 // The original value is not a string. Should return the value in it's
96 // original type.
97 if (newValue.equals(oldValue.toString())) {
98 return oldValue;
99 } else {
100 // Must take the value from the editor and get the value and cast it to the new type.
101 Class<?> cls = oldValue.getClass();
102 try {
103 Method method = MethodUtil.getMethod(cls, "valueOf", new Class[]{String.class});
104 newValue = MethodUtil.invoke(method, oldValue, new Object[] { editor.getText()});
105 } catch (Exception ex) {
106 // Fail silently and return the newValue (a String object)
107 }
108 }
109 }
110 return newValue;
111 }
112
113 public void selectAll() {
114 editor.selectAll();
115 editor.requestFocus();
116 }
117
118 // This used to do something but now it doesn't. It couldn't be
119 // removed because it would be an API change to do so.
120 public void focusGained(FocusEvent e) {}
121
122 // This used to do something but now it doesn't. It couldn't be
123 // removed because it would be an API change to do so.
124 public void focusLost(FocusEvent e) {}
125
126 public void addActionListener(ActionListener l) {
127 editor.addActionListener(l);
128 }
129
130 public void removeActionListener(ActionListener l) {
131 editor.removeActionListener(l);
132 }
133
134 static class BorderlessTextField extends JTextField {
135 public BorderlessTextField(String value,int n) {
136 super(value,n);
137 }
138
139 // workaround for 4530952
140 public void setText(String s) {
141 if (getText().equals(s)) {
142 return;
143 }
144 super.setText(s);
145 }
146
147 public void setBorder(Border b) {
148 if (!(b instanceof UIResource)) {
149 super.setBorder(b);
150 }
151 }
152 }
153
154 /**
155 * A subclass of BasicComboBoxEditor that implements UIResource.
156 * BasicComboBoxEditor doesn't implement UIResource
157 * directly so that applications can safely override the
158 * cellRenderer property with BasicListCellRenderer subclasses.
159 * <p>
160 * <strong>Warning:</strong>
161 * Serialized objects of this class will not be compatible with
162 * future Swing releases. The current serialization support is
163 * appropriate for short term storage or RMI between applications running
164 * the same version of Swing. As of 1.4, support for long term storage
165 * of all JavaBeans™
166 * has been added to the <code>java.beans</code> package.
167 * Please see {@link java.beans.XMLEncoder}.
168 */
169 @SuppressWarnings("serial") // Same-version serialization only
170 public static class UIResource extends BasicComboBoxEditor
171 implements javax.swing.plaf.UIResource {
172 }
173 }