Source Code Cross Referenced for STextArea.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.*;
028:
029:        import javax.swing.*;
030:
031:        /**
032:         * SOFIA implementation of a JTextArea. This Text Area can be bound to a DataStore column.
033:         */
034:
035:        public class STextArea extends JTextArea implements 
036:                ModelChangedListener, SComponent {
037:
038:            DataStoreBuffer _ds;
039:            String _dsCol;
040:            SComponentHelper _helper;
041:
042:            /**
043:             * Constructs a new TextArea.  A default model is set, the initial string
044:             * is null, and rows/columns are set to 0.
045:             */
046:            public STextArea() {
047:                super ();
048:                _helper = new SComponentHelper(this );
049:            }
050:
051:            /**
052:             * Constructs a new empty TextArea with the specified number of
053:             * rows and columns.  A default model is created, and the initial
054:             * string is null.
055:             *
056:             * @param rows the number of rows >= 0
057:             * @param columns the number of columns >= 0
058:             * @exception IllegalArgumentException if the rows or columns
059:             *  arguments are negative.
060:             */
061:            public STextArea(int rows, int columns) {
062:                super (rows, columns);
063:                _helper = new SComponentHelper(this );
064:            }
065:
066:            /**
067:             * Constructs a new TextArea with the specified text displayed.
068:             * A default model is created and rows/columns are set to 0.
069:             *
070:             * @param text the text to be displayed, or null
071:             */
072:            public STextArea(String text) {
073:                super (text);
074:                _helper = new SComponentHelper(this );
075:            }
076:
077:            /**
078:             * Constructs a new TextArea with the specified text and number
079:             * of rows and columns.  A default model is created.
080:             *
081:             * @param text the text to be displayed, or null
082:             * @param rows the number of rows >= 0
083:             * @param columns the number of columns >= 0
084:             * @exception IllegalArgumentException if the rows or columns
085:             *  arguments are negative.
086:             */
087:            public STextArea(String text, int rows, int columns) {
088:                super (text, rows, columns);
089:                _helper = new SComponentHelper(this );
090:            }
091:
092:            /**
093:             * Binds the component to a DataStore column
094:             * @param dsb The DataStore to bind to
095:             * @param column  The column to bind to
096:             */
097:            public void setColumn(DataStoreBuffer dsb, String column) {
098:                _ds = dsb;
099:                _dsCol = column;
100:                _ds.addModelChangedListener(this );
101:                evalColumn();
102:            }
103:
104:            /**
105:             * @see ModelChangedListener#modelChanged(ModelChangedEvent)
106:             */
107:            public void modelChanged(ModelChangedEvent evt) {
108:                evalColumn();
109:            }
110:
111:            private void evalColumn() {
112:                try {
113:                    if (_ds != null && _dsCol != null) {
114:                        setText(_ds.getFormattedString(_dsCol));
115:                        _helper.setDataDirty(false);
116:                    }
117:                } catch (Exception e) {
118:                    setText(null);
119:                }
120:            }
121:
122:            /**
123:             * Returns the value of the data in the component
124:             */
125:            public String getValue() {
126:                try {
127:                    if (_ds != null) {
128:                        if (_helper.isDataDirty())
129:                            return getText();
130:                        else
131:                            return _ds.getFormattedString(_dsCol);
132:                    }
133:                } catch (DataStoreException ex) {
134:                    ex.printStackTrace();
135:                    return null;
136:                }
137:                return getText();
138:            }
139:
140:            /**
141:             * This method is used by the framework and should not be called directly
142:             */
143:            public ValueChangedEvent generateValueChangedEvent() {
144:                try {
145:                    if (_ds == null)
146:                        return null;
147:                    else {
148:                        String newValue = getText();
149:                        return new ValueChangedEvent(this , _ds
150:                                .getFormattedString(_dsCol), newValue, _ds, _ds
151:                                .getRow(), _ds.getColumnIndex(_dsCol));
152:
153:                    }
154:                } catch (Exception e) {
155:                    e.printStackTrace();
156:                    return null;
157:                }
158:            }
159:
160:            /**
161:             * This method is used by the framework and should not be called directly
162:             */
163:            public SComponentHelper getHelper() {
164:                return _helper;
165:            }
166:
167:            /**
168:             * This method adds a listener the will be notified when the value in this component changes.
169:             * @param l The listener to add.
170:             */
171:            public void addValueChangedListener(ValueChangedListener l) {
172:                _helper.addValueChangedListener(l);
173:            }
174:
175:            /**
176:             * This method removes a listener from the list that will be notified if the text in the component changes.
177:             * @param l The listener to remove.
178:             */
179:            public void removeValueChangedListener(ValueChangedListener l) {
180:                _helper.removeValueChangedListener(l);
181:            }
182:
183:            /**
184:             * Returns the maximum number of characters you are allowed to type in this box
185:             */
186:            public int getMaxLength() {
187:                return _helper.getMaxLength();
188:            }
189:
190:            /**
191:             * Sets the maximum number of characters you are allowed to type in this box
192:             */
193:            public void setMaxLength(int maxLength) {
194:                _helper.setMaxLength(maxLength);
195:            }
196:
197:        }
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