Source Code Cross Referenced for STextField.java in  » J2EE » Sofia » com » salmonllc » swing » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Sofia » com.salmonllc.swing 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        //** Copyright Statement ***************************************************
002:        //The Salmon Open Framework for Internet Applications (SOFIA)
003:        // Copyright (C) 1999 - 2002, Salmon LLC
004:        //
005:        // This program is free software; you can redistribute it and/or
006:        // modify it under the terms of the GNU General Public License version 2
007:        // as published by the Free Software Foundation;
008:        //
009:        // This program is distributed in the hope that it will be useful,
010:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
011:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012:        // GNU General Public License for more details.
013:        //
014:        // You should have received a copy of the GNU General Public License
015:        // along with this program; if not, write to the Free Software
016:        // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
017:        //
018:        // For more information please visit http://www.salmonllc.com
019:        //** End Copyright Statement ***************************************************
020:
021:        package com.salmonllc.swing;
022:
023:        import com.salmonllc.sql.DataStoreBuffer;
024:        import com.salmonllc.sql.DataStoreException;
025:        import com.salmonllc.sql.ModelChangedEvent;
026:        import com.salmonllc.sql.ModelChangedListener;
027:        import com.salmonllc.swing.events.ValueChangedEvent;
028:        import com.salmonllc.swing.events.ValueChangedListener;
029:
030:        import javax.swing.*;
031:        import javax.swing.text.*;
032:
033:        /**
034:         * SOFIA implementation of a JTextField. This Text Field can be bound to a DataStore column.
035:         */
036:
037:        public class STextField extends JTextField implements 
038:                ModelChangedListener, SComponent {
039:
040:            private DataStoreBuffer _ds;
041:            private String _dsCol;
042:            private SComponentHelper _helper;
043:
044:            /**
045:             * Constructs a new <code>TextField</code>.  A default model is created,
046:             * the initial string is <code>null</code>,
047:             * and the number of columns is set to 0.
048:             */
049:            public STextField() {
050:                super ();
051:                _helper = new SComponentHelper(this );
052:            }
053:
054:            /**
055:             * Constructs a new empty <code>TextField</code> with the specified
056:             * number of columns.
057:             * A default model is created and the initial string is set to
058:             * <code>null</code>.
059:             *
060:             * @param columns  the number of columns to use to calculate
061:             *   the preferred width; if columns is set to zero, the
062:             *   preferred width will be whatever naturally results from
063:             *   the component implementation
064:             */
065:            public STextField(int columns) {
066:                super (columns);
067:                _helper = new SComponentHelper(this );
068:            }
069:
070:            /**
071:             * Constructs a new <code>TextField</code> initialized with the
072:             * specified text. A default model is created and the number of
073:             * columns is 0.
074:             *
075:             * @param text the text to be displayed, or <code>null</code>
076:             */
077:            public STextField(String text) {
078:                super (text);
079:                _helper = new SComponentHelper(this );
080:            }
081:
082:            /**
083:             * Constructs a new <code>TextField</code> initialized with the
084:             * specified text and columns.  A default model is created.
085:             *
086:             * @param text the text to be displayed, or <code>null</code>
087:             * @param columns  the number of columns to use to calculate
088:             *   the preferred width; if columns is set to zero, the
089:             *   preferred width will be whatever naturally results from
090:             *   the component implementation
091:             */
092:            public STextField(String text, int columns) {
093:                super (text, columns);
094:                _helper = new SComponentHelper(this );
095:            }
096:
097:            /**
098:             * Binds the component to a DataStore column
099:             * @param dsb The DataStore to bind to
100:             * @param column  The column to bind to
101:             */
102:            public void setColumn(DataStoreBuffer dsb, String column) {
103:                _ds = dsb;
104:                _dsCol = column;
105:                _ds.addModelChangedListener(this );
106:                evalColumn();
107:            }
108:
109:            /**
110:             * Overrides the setDocument Method such that the documentlistener can be added.
111:             * @param doc The Document model to use
112:             */
113:            public void setDocument(Document doc) {
114:                super .setDocument(doc);
115:                doc.removeDocumentListener(_helper);
116:                doc.addDocumentListener(_helper);
117:            }
118:
119:            /**
120:             * @see com.salmonllc.sql.ModelChangedListener#modelChanged(ModelChangedEvent)
121:             */
122:            public void modelChanged(ModelChangedEvent evt) {
123:                evalColumn();
124:            }
125:
126:            private void evalColumn() {
127:                try {
128:                    if (_ds != null && _dsCol != null) {
129:                        setText(_ds.getFormattedString(_dsCol));
130:                        _helper.setDataDirty(false);
131:                    }
132:                } catch (Exception e) {
133:                    setText(null);
134:                }
135:            }
136:
137:            /**
138:             * Returns the value of the data in the component for the current row in the DataStore.
139:             */
140:            public String getValue() {
141:                try {
142:                    if (_ds != null) {
143:                        if (_helper.isDataDirty())
144:                            return getText();
145:                        else
146:                            return _ds.getFormattedString(_dsCol);
147:                    }
148:                } catch (DataStoreException ex) {
149:                    ex.printStackTrace();
150:                    return null;
151:                }
152:                return getText();
153:            }
154:
155:            /**
156:             * This method is used by the framework and should not be called directly
157:             */
158:            public ValueChangedEvent generateValueChangedEvent() {
159:                try {
160:                    if (_ds == null || _ds.getRow() < 0)
161:                        return null;
162:                    else {
163:                        String newValue = getText();
164:                        return new ValueChangedEvent(this , _ds
165:                                .getFormattedString(_dsCol), newValue, _ds, _ds
166:                                .getRow(), _ds.getColumnIndex(_dsCol));
167:                    }
168:                } catch (Exception e) {
169:                    e.printStackTrace();
170:                    return null;
171:                }
172:            }
173:
174:            /**
175:             * This method is used by the framework and should not be called directly
176:             */
177:            public SComponentHelper getHelper() {
178:                return _helper;
179:            }
180:
181:            /**
182:             * This method adds a listener the will be notified when the value in this component changes.
183:             * @param l The listener to add.
184:             */
185:            public void addValueChangedListener(ValueChangedListener l) {
186:                _helper.addValueChangedListener(l);
187:            }
188:
189:            /**
190:             * This method removes a listener from the list that will be notified if the text in the component changes.
191:             * @param l The listener to remove.
192:             */
193:            public void removeValueChangedListener(ValueChangedListener l) {
194:                _helper.removeValueChangedListener(l);
195:            }
196:
197:            /**
198:             * Returns the maximum number of characters you are allowed to type in this box
199:             */
200:            public int getMaxLength() {
201:                return _helper.getMaxLength();
202:            }
203:
204:            /**
205:             * Sets the maximum number of characters you are allowed to type in this box
206:             */
207:            public void setMaxLength(int maxLength) {
208:                _helper.setMaxLength(maxLength);
209:            }
210:        }
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