java undo redo

java-Undo redo.java

import java.awt.event.ActionEvent;
import java.util.logging.Logger;
import javax.swing.AbstractAction;
import javax.swing.KeyStroke;
import javax.swing.event.UndoableEditEvent;
import javax.swing.event.UndoableEditListener;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.CannotUndoException;
import javax.swing.undo.UndoManager;

/**
 * Установка отмены и повтора ввода текста для текстовых компонентов
 * <p>
 * @author ezhov_da
 */
public class UndoRedoManager
{
    private static final Logger LOG = Logger.getLogger(UndoRedoManager.class.getName());

    public synchronized static void setUR(JTextComponent textComponent)
    {
        final UndoManager undo = new UndoManager();
        Document doc = textComponent.getDocument();
        doc.addUndoableEditListener(new UndoableEditListener()
        {
            public void undoableEditHappened(UndoableEditEvent evt)
            {
                undo.addEdit(evt.getEdit());
            }
        });
        textComponent.getActionMap().put("Undo",
                new AbstractAction("Undo")
                {
                    public void actionPerformed(ActionEvent evt)
                    {
                        try
                        {
                            if (undo.canUndo())
                            {
                                undo.undo();
                            }
                        } catch (CannotUndoException e)
                        {
                        }
                    }
                });
        textComponent.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");
        textComponent.getActionMap().put("Redo",
                new AbstractAction("Redo")
                {
                    public void actionPerformed(ActionEvent evt)
                    {
                        try
                        {
                            if (undo.canRedo())
                            {
                                undo.redo();
                            }
                        } catch (CannotRedoException e)
                        {
                        }
                    }
                });
        textComponent.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo");
    }