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1   /*
2    * Copyright (c) 2004, 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.
8    *
9    * This code is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12   * version 2 for more details (a copy is included in the LICENSE file that
13   * accompanied this code).
14   *
15   * You should have received a copy of the GNU General Public License version
16   * 2 along with this work; if not, write to the Free Software Foundation,
17   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18   *
19   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20   * or visit www.oracle.com if you need additional information or have any
21   * questions.
22   *
23   */
24  
25  package sun.jvm.hotspot.ui;
26  
27  
28  import java.awt.event.*;
29  import javax.swing.*;
30  import javax.swing.event.*;
31  
32  /** Provides an editable text field with history. */
33  
34  public class HistoryComboBox extends JComboBox {
35    static final int HISTORY_LENGTH = 15;
36  
37    public HistoryComboBox() {
38      setEditable(true);
39      addActionListener(new ActionListener() {
40          public void actionPerformed(ActionEvent e) {
41            Object text = getSelectedItem();
42            if (text != null) {
43              setText((String)text);
44            }
45          }
46        });
47    }
48  
49    public String getText() {
50      Object text = getSelectedItem();
51      if (text == null) {
52        return "";
53      }
54      return (String)text;
55    }
56  
57    public void setText(String text) {
58      removeItem(text);
59      insertItemAt(text, 0);
60      setSelectedItem(text);
61      int length = getModel().getSize();
62      while (length > HISTORY_LENGTH) {
63        removeItemAt(--length);
64      }
65    }
66  }