Java SE (Java Platform, Standard Edition)

I have a Java Swing application with a JTable, and I would like to add "undo" functionality to text editing in the first column of the table. After Googling and searching these forums for several hours, I have a very vague idea of how Undo works.


What I have put together so far is a customized JTextField class ( that compiles! ) with an UndoManager connected to the document part of the JTextField. I have then set the JTextField subclass as the default cell editor for that 1st column, and the code compiles fine. Now I wish to enable the user to undo edits in the currently selected table cell by using the JMenuItem "undo" to tell the undo manager to undo changes.


Here is where I add the class to the table as default cell editor:

   
ExclusionsTable.getColumnModel().getColumn(0).setCellEditor(new MyTableCellEditor() );

And below is the MyTableCellEditor() class:

/*
 * MyTableCellEditor.java
 *
 * Created on November 30, 2006, 11:42 AM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package configurationeditor;

import java.awt.Component;
import javax.swing.AbstractCellEditor;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.TableCellEditor;
import javax.swing.text.Document;
import javax.swing.undo.UndoManager;

/**
 *
 * @author John.Gooch
 */

public class MyTableCellEditor extends AbstractCellEditor implements TableCellEditor {
    // This is the component that will handle the editing of the cell value
    private JComponent component = new JTextField();
    protected UndoManager manager;

    public MyTableCellEditor() {
        super();
        manager = new UndoManager();
        Document document = ( (JTextField ) component ).getDocument();
        //document.addUndoableEditListener( manager );
        document.addUndoableEditListener( manager );

    }
    
    
    // This method is called when a cell value is edited by the user.
    public Component getTableCellEditorComponent(JTable table, Object value,
            boolean isSelected, int rowIndex, int vColIndex) {
        // 'value' is value contained in the cell located at (rowIndex, vColIndex)

        if (isSelected) {
            // cell (and perhaps other cells) are selected
        }

        // Configure the component with the specified value
        ((JTextField)component).setText((String)value);

        // Return the configured component
        return component;
    }

    // This method is called when editing is completed.
    // It must return the new value to be stored in the cell.
    public Object getCellEditorValue() {
        return ((JTextField)component).getText();
    }
}

No problems with compiling, but how would I activate the undo function of the Undo manager? Here is my placeholder Undo function:

    private void EditCutActionPerformed(java.awt.event.ActionEvent evt) {                                        
// TODO add your handling code here:
    }  

Thank You for any advice or guidance,

John Gooch