Sharing Document between TableEditor and JTextArea

Question

hi,
i'm trying to share a javax.swing.text.Document between a TableCellEditor and a JTextArea, so that both, the textarea and the tableeditor show the same text, regardless of where the user is typing.
At the moment I'm doing this: every time the selection of the table changes, i get the document from the table editor and assign it to the textarea. This construct seems wo work, but only in one direction: if i type text into the table cell, the textarea gets updated, but not the other way round.
any idea, what could be wrong?
some code:
public void valueChanged(ListSelectionEvent e) {
    if(e.getValueIsAdjusting()) {
        int row = table.getSelectedRow();
        JTextComponent txtComp = (JTextComponent) table.getCellEditor(row, TRANSLATED_COL).getTableCellEditorComponent(table, "", true, row, TRANSLATED_COL);
        translatedTextArea.setDocument(txtComp.getDocument());
        showItem(row);
}

Answer 1

sorry for my late response. here is an example:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.util.Enumeration;
import java.util.Properties;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.text.JTextComponent;
public class TranslatorPanel extends JPanel implements TableModelListener, ListSelectionListener {
     public static final int ITEM_COL = 0;
     public static final int TRANSLATED_COL = 1;
    private JTable table;
    private DefaultTableModel model;
    private JTextArea translatedTextArea = new JTextArea();
    public TranslatorPanel() {
        initGUI();
    private void initGUI() {
        model = new DefaultTableModel(new Object[][] {}, new String[] {"Key","Value"});
        model.addTableModelListener(this);
        table = new JTable(model) {
             public boolean isCellEditable(int row, int col) {
                  return col == TRANSLATED_COL;
        table.setSurrendersFocusOnKeystroke(true);
        table.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        table.getSelectionModel().addListSelectionListener(this);
        setLayout(new BorderLayout());
        add(new JScrollPane(table), BorderLayout.CENTER);
        add(new JScrollPane(translatedTextArea), BorderLayout.SOUTH);
        setSize(800,600);
        translatedTextArea.setPreferredSize(new Dimension(800, 300));
        TranslationItem item = new TranslationItem("key1");
        item.setTranslations("value1", "en");
        model.addRow(new Object[] {item, item.getTranslation("en")});
        item = new TranslationItem("key2");
        item.setTranslations("value2", "en");
        model.addRow(new Object[] {item, item.getTranslation("en")});
        item = new TranslationItem("key3");
        item.setTranslations("value3", "en");
        model.addRow(new Object[] {item, item.getTranslation("en")});
    // called, if the content of the table has changed
     public void tableChanged(TableModelEvent e) {
        int row = e.getLastRow();
        if (e.getType() == TableModelEvent.UPDATE) {
             // store the new value in the item
             TranslationItem item = (TranslationItem) model.getValueAt(row, ITEM_COL);
             item.setTranslations((String)model.getValueAt(row, TRANSLATED_COL), "en");
     // called if selection of the table changes
     public void valueChanged(ListSelectionEvent e) {
          if(e.getValueIsAdjusting()) {
               int row = table.getSelectedRow();
               JTextComponent txtComp = (JTextComponent) table.getCellEditor(row, TRANSLATED_COL).getTableCellEditorComponent(table, "", true, row, TRANSLATED_COL);
               translatedTextArea.setDocument(txtComp.getDocument());
               showItem(row);
     private void showItem(int row) {
          TranslationItem item = (TranslationItem) model.getValueAt(row, ITEM_COL);
          translatedTextArea.setText(item.getTranslation("en"));
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setSize(800,600);
        frame.add(new TranslatorPanel());
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    private class TranslationItem implements Comparable {
        private String key = null;
        private Properties translations = new Properties();
        public TranslationItem(String key) {
            this.key = key;
        public String getKey() {
            return key;
        public void setKey(String key) {
            this.key = key;
        public String getTranslation(String locale) {
            String value = translations.getProperty(locale);
            return value == null ? "" : value;
        public boolean translatedForLocale(String locale) {
            String translation = getTranslation(locale);
            if(translation == null || translation.length() <= 0) {
                return false;
            } else {
                return true;
        public void setTranslations(String translation, String locale) {
            translations.setProperty(locale, translation);
        public String toString() {
            return key;
        public void print() {
            System.out.println("key " + key);
            Enumeration en = translations.propertyNames();
            while (en.hasMoreElements()) {
                String locale = (String) en.nextElement();
                String translation = translations.getProperty(locale);
                System.out.println("\t"+locale+" = " + translation);
        public int compareTo(Object o) {
            if(o instanceof TranslationItem) {
                TranslationItem ti = (TranslationItem) o;
                return ti.getKey().compareTo(getKey());
            return 0;
}