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See the 18 * GNU Lesser General Public License version 3 for more details 19 * (a copy is included in the LICENSE file that accompanied this code). 20 * 21 * You should have received a copy of the GNU Lesser General Public License 22 * version 3 along with OpenOffice.org. If not, see 23 * <http://www.openoffice.org/license.html> 24 * for a copy of the LGPLv3 License. 25 * 26 ************************************************************************/ 27 import com.sun.star.uno.Type; 28 import com.sun.star.uno.UnoRuntime; 29 import com.sun.star.table.XCell; 30 import com.sun.star.util.XModifyListener; 31 import com.sun.star.beans.XPropertySet; 32 import com.sun.star.text.XTextRange; 33 import com.sun.star.form.binding.IncompatibleTypesException; 34 35 /** a value binding to be connected to a form control 36 37 This binding synchronizes the text contained in a table cell (which you must 38 pass upon construction) to the text in an XBindableValue. 39 40 Well, in real it does not synchronize both directions. The ValueBinding 41 service has not much room for own activity: It allows notification of changes 42 in the own value, and it allows external instances to set the current value. 43 44 Note that we implement this binding as a separate thread, which is (more or 45 less permanently) polling for a new text at the cell. This is unfortunate, but 46 sadly the Writer table cells do not support actively notifying changes in their 47 content to other interested parties. 48 */ 49 public class TableCellTextBinding 50 extends java.lang.Thread 51 implements com.sun.star.form.binding.XValueBinding, 52 com.sun.star.util.XModifyBroadcaster 53 { 54 private XTextRange m_cellText; 55 private Object m_writeSignal; 56 private String m_newCellText; 57 private String m_lastKnownCellText; 58 private boolean m_haveNewCellText; 59 private java.util.List m_listeners; 60 61 /** Creates a new instance of TableCellTextBinding */ 62 public TableCellTextBinding( XCell cell ) 63 { 64 m_cellText = (XTextRange)UnoRuntime.queryInterface( XTextRange.class, cell ); 65 66 m_newCellText = new String(); 67 m_listeners = new java.util.LinkedList(); 68 69 start(); 70 } 71 72 /** retrieves the list of data types which this binding can exchange 73 */ 74 public com.sun.star.uno.Type[] getSupportedValueTypes() 75 { 76 try 77 { 78 // well, only strings here ... 79 return new Type[] { 80 getStringType() 81 }; 82 } 83 catch( java.lang.Exception e ) 84 { 85 } 86 return new Type[] { }; 87 } 88 89 /** retrieves the current value 90 */ 91 public Object getValue(com.sun.star.uno.Type type) throws com.sun.star.form.binding.IncompatibleTypesException 92 { 93 if ( !type.equals( getStringType() ) ) 94 throw new com.sun.star.form.binding.IncompatibleTypesException(); 95 96 return m_cellText.getString(); 97 } 98 99 /** sets a new value 100 */ 101 public void setValue(Object obj) throws com.sun.star.form.binding.IncompatibleTypesException 102 { 103 String text; 104 try 105 { 106 text = (String)obj; 107 } 108 catch( java.lang.ClassCastException e ) 109 { 110 throw new com.sun.star.form.binding.IncompatibleTypesException(); 111 } 112 // remember the new text 113 synchronized( m_newCellText ) 114 { 115 m_newCellText = text; 116 m_haveNewCellText = true; 117 } 118 // and wake up the thread which is waiting for it 119 synchronized( m_writeSignal ) 120 { 121 m_writeSignal.notify(); 122 } 123 } 124 125 /** determines whether a given value type is supported 126 */ 127 public boolean supportsType(com.sun.star.uno.Type type) 128 { 129 return type.equals( getStringType() ); 130 } 131 132 /** retrieves the UNO type for the string class 133 */ 134 private static final Type getStringType() 135 { 136 return new com.sun.star.uno.Type( String.class ); 137 } 138 139 /** runs the thread 140 */ 141 public void run() 142 { 143 try 144 { 145 m_writeSignal = new Object(); 146 while ( true ) 147 { 148 // go sleep a while 149 synchronized( m_writeSignal ) 150 { 151 m_writeSignal.wait( 200 ); 152 } 153 154 // if there's new text in the control, propagate it to the cell 155 synchronized ( m_newCellText ) 156 { 157 if ( m_haveNewCellText ) 158 { 159 m_cellText.setString( m_newCellText ); 160 m_lastKnownCellText = m_newCellText; 161 } 162 m_haveNewCellText = false; 163 } 164 165 // if there's new text in the cell, propagate it to the control 166 String currentCellText = m_cellText.getString(); 167 if ( !currentCellText.equals( m_lastKnownCellText ) ) 168 { 169 m_lastKnownCellText = currentCellText; 170 // notify the modification 171 synchronized( m_listeners ) 172 { 173 com.sun.star.lang.EventObject eventSource = new com.sun.star.lang.EventObject( this ); 174 175 java.util.Iterator loop = m_listeners.iterator(); 176 while ( loop.hasNext() ) 177 { 178 ((XModifyListener)loop.next()).modified( eventSource ); 179 } 180 } 181 } 182 } 183 } 184 catch( java.lang.Exception e ) 185 { 186 e.printStackTrace(System.err); 187 } 188 } 189 190 public void addModifyListener(com.sun.star.util.XModifyListener xModifyListener) 191 { 192 synchronized( m_listeners ) 193 { 194 m_listeners.add( xModifyListener ); 195 } 196 } 197 198 public void removeModifyListener(com.sun.star.util.XModifyListener xModifyListener) 199 { 200 synchronized( m_listeners ) 201 { 202 m_listeners.remove( xModifyListener ); 203 } 204 } 205 206 public void disposing(com.sun.star.lang.EventObject eventObject) 207 { 208 // not interested in 209 } 210 } 211