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Java > Open Source Codes > org > hsqldb > util > ZaurusChoice


1 /* Copyright (c) 2001-2005, The HSQL Development Group
2  * All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are met:
6  *
7  * Redistributions of source code must retain the above copyright notice, this
8  * list of conditions and the following disclaimer.
9  *
10  * Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
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13  *
14  * Neither the name of the HSQL Development Group nor the names of its
15  * contributors may be used to endorse or promote products derived from this
16  * software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
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28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30
31
32 package org.hsqldb.util;
33
34 import java.util.Vector JavaDoc;
35 import java.awt.Choice JavaDoc;
36 import java.awt.Color JavaDoc;
37
38 /**
39  * Class declaration
40  *
41  *
42  * @author ulrivo@users
43  * @version 1.0.0
44  */
45
46 // a Choice for the GUI which implements ZaurusComponent
47 //
48 // in addition to a Choice, a ZaurusChoice saves a vector for values of the items
49 // for instance: in the choice list, there are the labels A,B,C
50 // the corresponding values are 100,200,300
51 // during the defintion process, the values are provided by a second argument to add
52 // getContent() answers the value !!
53 public class ZaurusChoice extends Choice JavaDoc implements ZaurusComponent {
54
55     private static final int MaxLenInZChoice = 15;
56     Vector JavaDoc values;
57     int countChanges;
58
59     public ZaurusChoice() {
60
61         super();
62
63         values = new Vector JavaDoc(20);
64         countChanges = 0;
65     }
66
67     // restrict strings for the choice to MaxLenInZChoice characters
68 public void add(String JavaDoc item, String JavaDoc value) {
69
70         int maxChar = MaxLenInZChoice;
71
72         if (item.length() < MaxLenInZChoice) {
73             maxChar = item.length();
74         }
75
76         super.add(item.substring(0, maxChar));
77         values.addElement(value);
78     }
79
80     public void clearChanges() {
81         countChanges = 0;
82     }
83
84     public void clearContent() {
85         super.select(0);
86     }
87
88     public String JavaDoc getContent() {
89         return (String JavaDoc) values.elementAt(super.getSelectedIndex());
90     }
91
92     public boolean hasChanged() {
93         return countChanges > 0;
94     }
95
96     public void requestFocus() {
97         super.requestFocus();
98     }
99
100     public void setChanged() {
101         countChanges++;
102     }
103
104     // set the choice to the element in choice of the corresponding value
105 public void setContent(String JavaDoc s) {
106         super.select(this.findValue(s));
107     }
108
109     public void setEditable(boolean b) {
110
111         super.setEnabled(b);
112
113         if (b) {
114             super.setBackground(Color.white);
115         } else {
116             super.setBackground(Color.lightGray);
117         } // end of if (b)else
118 }
119
120     // find for a given value the index in values
121 private int findValue(String JavaDoc s) {
122
123         for (int i = 0; i < values.size(); i++) {
124             if (s.equals(values.elementAt(i))) {
125                 return i;
126             } // end of if (s.equals(values.elementAt(i)))
127 } // end of for (int i=0; i<values.size(); i++)
128
129         return -1;
130     }
131 }
132
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