Undo / Redo Feature in Swing

Hi all,
Iam working on swing project which uses Undo/Redo feature for drag and drop figure and delete,cut,copy,paste and all the feature which ever want to use, and iam using multiple internal frames so the feature Undo/Redo should be specific to perticular internal frame.
Is any buddy already done such a kind of thing then pls help me, or if it's possible then pls send the code also.
Regards
Laxmikant

Hi,
you would have to create an UndoableEditListener for each object, undo/redo shall be perfomed. The listener then is connected to an instance of UndoManager to do the actual handling:  /** Listener for edits on a document. */
  private UndoableEditListener undoHandler = new UndoHandler();
  /** UndoManager that we add edits to. */
  private UndoManager undo = new UndoManager();
  /** inner class for handling undoable edit events */
  public class UndoHandler implements UndoableEditListener {
     * Messaged when the Document has created an edit, the edit is
     * added to <code>undo</code>, an instance of UndoManager.
    public void undoableEditHappened(UndoableEditEvent e) {
      undo.addEdit(e.getEdit());
  } This now can be registered with let's say a Document like thiseditor.getDocument().addUndoableEditListener(undoHandler); (editor is an instance of JEditorPane containing the document).
Once you have this, you only need actions to perform undo or redo by calling the respective method of your instance of UndoManager undo() and redo().
Hope that helps
Ulrich

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    Bernard

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    http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html

  • To many undo redo button

    Hi to everyone!!!
    I need your advice for my problem!!
    when I cliked new in the file to create a new JTextPane the undo redo button will multiply and if I have so many JTextPane then I have many undo redo in my toolbar
    here is my code.
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import javax.swing.event.*;
    import javax.swing.text.*;
    import java.util.*;
    import javax.swing.undo.*;
    public class URTest extends JFrame {
         JToolBar toolBar = new JToolBar();
         JButton undo;
         JButton redo = new JButton("Redo");
         JMenuBar menuBar = new JMenuBar();
         JMenu menu = new JMenu("File");
         JMenuItem item = new JMenuItem("New");
         JMenuItem item2 = new JMenuItem("Close");
         JTabbedPane tabbedPane = new JTabbedPane();
         JTextPane pane;
         public URTest() {
              item.addActionListener(new ActionListener() {
                   public void actionPerformed(ActionEvent e) {
                        create();
              item2.addActionListener(new ActionListener() {
                   public void actionPerformed(ActionEvent e) {
                        removeCreate();
              menu.add(item);
              menu.add(item2);
              menuBar.add(menu);
              this.add(toolBar,BorderLayout.NORTH);
              this.add(tabbedPane);
              this.setJMenuBar(menuBar);
         void create() {
              undo = new JButton("Undo");
              redo = new JButton("Redo");
              pane = new JTextPane();
              EditorKit editorKit = new StyledEditorKit() {
                   public Document createDefaultDocument() {
                        return new SyntaxDocument();
              pane.setEditorKit(editorKit);
              final CompoundUndoManager undoManager = new CompoundUndoManager( pane );
              undo.addActionListener( new ActionListener()
                   public void actionPerformed(ActionEvent e)
                        try
                             undoManager.undo();
                             pane.requestFocus();
                        catch (CannotUndoException ex)
                             System.out.println("Unable to undo: " + ex);
              redo.addActionListener( new ActionListener()
                   public void actionPerformed(ActionEvent e)
                        try
                             undoManager.redo();
                             pane.requestFocus();
                        catch (CannotRedoException ex)
                             System.out.println("Unable to redo: " + ex);
              toolBar.add(undo);
              toolBar.add(redo);
              tabbedPane.addTab("Tab",pane);
         void removeCreate() {
              tabbedPane.remove(tabbedPane.getSelectedIndex());
         public static void main(String[] args) {
              URTest frame = new URTest();
              frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
              frame.setSize(400,400);
              frame.setVisible(true);
    class CompoundUndoManager extends UndoManager
         implements UndoableEditListener, DocumentListener
         public CompoundEdit compoundEdit;
         private JTextComponent editor;
         //  These fields are used to help determine whether the edit is an
         //  incremental edit. For each character added the offset and length
         //  should increase by 1 or decrease by 1 for each character removed.
         private int lastOffset;
         private int lastLength;
         public CompoundUndoManager(JTextComponent editor)
              this.editor = editor;
              editor.getDocument().addUndoableEditListener( this );
         **  Add a DocumentLister before the undo is done so we can position
         **  the Caret correctly as each edit is undone.
         public void undo()
              editor.getDocument().addDocumentListener( this );
              super.undo();
              editor.getDocument().removeDocumentListener( this );
         **  Add a DocumentLister before the redo is done so we can position
         **  the Caret correctly as each edit is redone.
         public void redo()
              editor.getDocument().addDocumentListener( this );
              super.redo();
              editor.getDocument().removeDocumentListener( this );
         **  Whenever an UndoableEdit happens the edit will either be absorbed
         **  by the current compound edit or a new compound edit will be started
         public void undoableEditHappened(UndoableEditEvent e)
              //  Start a new compound edit
              if (compoundEdit == null)
                   compoundEdit = startCompoundEdit( e.getEdit() );
                   lastLength = editor.getDocument().getLength();
                   return;
              //  Check for an attribute change
              AbstractDocument.DefaultDocumentEvent event =
                   (AbstractDocument.DefaultDocumentEvent)e.getEdit();
              if  (event.getType().equals(DocumentEvent.EventType.CHANGE))
                   compoundEdit.addEdit( e.getEdit() );
                   return;
              //  Check for an incremental edit or backspace.
              //  The change in Caret position and Document length should be either
              //  1 or -1 .
              int offsetChange = editor.getCaretPosition() - lastOffset;
              int lengthChange = editor.getDocument().getLength() - lastLength;
              if (Math.abs(offsetChange) == 1
              &&  Math.abs(lengthChange) == 1)
                   compoundEdit.addEdit( e.getEdit() );
                   lastOffset = editor.getCaretPosition();
                   lastLength = editor.getDocument().getLength();
                   return;
              //  Not incremental edit, end previous edit and start a new one
              compoundEdit.end();
              compoundEdit = startCompoundEdit( e.getEdit() );
         **  Each CompoundEdit will store a group of related incremental edits
         **  (ie. each character typed or backspaced is an incremental edit)
         private CompoundEdit startCompoundEdit(UndoableEdit anEdit)
              //  Track Caret and Document information of this compound edit
              lastOffset = editor.getCaretPosition();
              lastLength = editor.getDocument().getLength();
              //  The compound edit is used to store incremental edits
              compoundEdit = new MyCompoundEdit();
              compoundEdit.addEdit( anEdit );
              //  The compound edit is added to the UndoManager. All incremental
              //  edits stored in the compound edit will be undone/redone at once
              addEdit( compoundEdit );
              return compoundEdit;
         //  Implement DocumentListener
         //      Updates to the Document as a result of Undo/Redo will cause the
         //  Caret to be repositioned
         public void insertUpdate(final DocumentEvent e)
              SwingUtilities.invokeLater(new Runnable()
                   public void run()
                        int offset = e.getOffset() + e.getLength();
                        offset = Math.min(offset, editor.getDocument().getLength());
                        editor.setCaretPosition( offset );
         public void removeUpdate(DocumentEvent e)
              editor.setCaretPosition(e.getOffset());
         public void changedUpdate(DocumentEvent e)      {}
         class MyCompoundEdit extends CompoundEdit
              public boolean isInProgress()
                   //  in order for the canUndo() and canRedo() methods to work
                   //  assume that the compound edit is never in progress
                   return false;
              public void undo() throws CannotUndoException
                   //  End the edit so future edits don't get absorbed by this edit
                   if (compoundEdit != null)
                        compoundEdit.end();
                   super.undo();
                   //  Always start a new compound edit after an undo
                   compoundEdit = null;

    I was not actually sure what you wanted so I made the wild guess that you actually wanted only one pair of Undo/Redo buttons. Here you go :import java.awt.*;
    import java.awt.event.*;
    import java.util.*;
    import java.util.List;
    import javax.swing.*;
    import javax.swing.event.*;
    import javax.swing.text.*;
    import javax.swing.undo.*;
    public class URTest extends JPanel {
         private JMenuBar theMenuBar;
         private JTabbedPane theTabbedPane;
         private List<Pane> thePanes;
         private static class Pane {
              private JTextPane theTextPane;
              private CompoundUndoManager theUndoManager;
              private class CompoundUndoManager extends UndoManager implements UndoableEditListener, DocumentListener {
                   public CompoundEdit compoundEdit;
                   private int lastOffset;
                   private int lastLength;
                   public CompoundUndoManager() {
                        compoundEdit = null;
                   public void undo() {
                        theTextPane.getDocument().addDocumentListener(this);
                        super.undo();
                        theTextPane.getDocument().removeDocumentListener(this);
                   public void redo() {
                        theTextPane.getDocument().addDocumentListener(this);
                        super.redo();
                        theTextPane.getDocument().removeDocumentListener(this);
                   public void undoableEditHappened(UndoableEditEvent e) {
                        if (compoundEdit == null) {
                             compoundEdit = startCompoundEdit(e.getEdit());
                             lastLength = theTextPane.getDocument().getLength();
                             return;
                        AbstractDocument.DefaultDocumentEvent event = (AbstractDocument.DefaultDocumentEvent)e.getEdit();
                        if (event.getType().equals(DocumentEvent.EventType.CHANGE)) {
                             compoundEdit.addEdit(e.getEdit());
                             return;
                        int offsetChange = theTextPane.getCaretPosition() - lastOffset;
                        int lengthChange = theTextPane.getDocument().getLength() - lastLength;
                        if (Math.abs(offsetChange) == 1
                             && Math.abs(lengthChange) == 1) {
                             compoundEdit.addEdit(e.getEdit());
                             lastOffset = theTextPane.getCaretPosition();
                             lastLength = theTextPane.getDocument().getLength();
                             return;
                        compoundEdit.end();
                        compoundEdit = startCompoundEdit(e.getEdit());
                   private CompoundEdit startCompoundEdit(UndoableEdit anEdit) {
                        lastOffset = theTextPane.getCaretPosition();
                        lastLength = theTextPane.getDocument().getLength();
                        compoundEdit = new MyCompoundEdit();
                        compoundEdit.addEdit(anEdit);
                        addEdit(compoundEdit);
                        return compoundEdit;
                   public void insertUpdate(final DocumentEvent e) {
                        SwingUtilities.invokeLater(new Runnable() {
                             public void run() {
                                  int offset = e.getOffset() + e.getLength();
                                  offset = Math.min(offset, theTextPane.getDocument().getLength());
                                  theTextPane.setCaretPosition(offset);
                   public void removeUpdate(DocumentEvent e) {
                        theTextPane.setCaretPosition(e.getOffset());
                   public void changedUpdate(DocumentEvent e) {}
                   class MyCompoundEdit extends CompoundEdit {
                        public boolean isInProgress() {
                             return false;
                        public void undo() throws CannotUndoException {
                             if (compoundEdit != null) compoundEdit.end();
                             super.undo();
                             compoundEdit = null;
              public Pane() {
                   theTextPane = new JTextPane();
                   theTextPane.setEditorKit(new StyledEditorKit() {
                        public Document createDefaultDocument() {
                             return new SyntaxDocument();
                   theUndoManager = new CompoundUndoManager();
                   theTextPane.getDocument().addUndoableEditListener(theUndoManager);
              public JTextPane getTextPane() {
                   return theTextPane;
              public UndoManager getUndoManager() {
                   return theUndoManager;
         public URTest() {
              super(new BorderLayout(5, 5));
              setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
              JToolBar toolBar = new JToolBar();
              toolBar.setFloatable(false);
              toolBar.add(new AbstractAction("Undo") {
                   public void actionPerformed(ActionEvent e) {
                        undo();
              toolBar.add(new AbstractAction("Redo") {
                   public void actionPerformed(ActionEvent e) {
                        redo();
              add(toolBar, BorderLayout.NORTH);
              thePanes = new LinkedList<Pane>();
              theTabbedPane = new JTabbedPane();
              add(theTabbedPane, BorderLayout.CENTER);
              theMenuBar = new JMenuBar();
              JMenu menu = new JMenu("File");
              menu.add(new AbstractAction("New") {
                   public void actionPerformed(ActionEvent e) {
                        create();
              menu.add(new AbstractAction("Close") {
                   public void actionPerformed(ActionEvent e) {
                        remove();
              theMenuBar.add(menu);
         public JMenuBar getMenuBar() {
              return theMenuBar;
         private void create() {
              Pane pane = new Pane();
              thePanes.add(pane);
              theTabbedPane.addTab("Tab", pane.getTextPane());
         private void remove() {
              Pane selectedPane = getSelectedPane();
              if (selectedPane == null) return;
              thePanes.remove(selectedPane);
              theTabbedPane.remove(selectedPane.getTextPane());
         private void undo() {
              Pane selectedPane = getSelectedPane();
              if (selectedPane == null) return;
              try {
                   selectedPane.getUndoManager().undo();
                   selectedPane.getTextPane().requestFocus();
              } catch (CannotUndoException ex) {
                   System.out.println("Unable to undo: " + ex);
         private void redo() {
              Pane selectedPane = getSelectedPane();
              if (selectedPane == null) return;
              try {
                   selectedPane.getUndoManager().redo();
                   selectedPane.getTextPane().requestFocus();
              } catch (CannotRedoException ex) {
                   System.out.println("Unable to redo: " + ex);
         private Pane getSelectedPane() {
              Component selectedComponent = theTabbedPane.getSelectedComponent();
              if (selectedComponent == null) return null;
              for (Pane pane : thePanes) {
                   if (pane.getTextPane() == selectedComponent) return pane;
              return null;
         private static void test() {
              JFrame f = new JFrame("URTest");
              f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              URTest urTest = new URTest();
              f.setContentPane(urTest);
              f.setJMenuBar(urTest.getMenuBar());
              f.setSize(400, 400);
              f.setLocationRelativeTo(null);
              f.setVisible(true);
         public static void main(String[] args) {
              SwingUtilities.invokeLater(new Runnable() {
                   public void run() {
                        test();
    }Hope it helps.

  • Keybindings for undo/redo buttons.

    I thought I knew how to do this, and I do seem to have this working fine for cut/copy/paste/select all keybindings CTRL X/C/V/A respectively.
    However I tried to do this for CTRL X and Y undo/redo and it's not working as I intended. Can anyone see what I'm doing wrong?
    I created a SSCCE based off the original example I was following from: [http://www.java2s.com/Code/Java/Swing-JFC/Undoredotextarea.htm]
    import java.awt.BorderLayout;
    import java.awt.GridLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.KeyEvent;
    import java.awt.event.KeyListener;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    import javax.swing.JTextArea;
    import javax.swing.KeyStroke;
    import javax.swing.event.UndoableEditEvent;
    import javax.swing.event.UndoableEditListener;
    import javax.swing.undo.CannotRedoException;
    import javax.swing.undo.UndoManager;
    public class UndoRedoTextArea extends JFrame implements KeyListener{
        private static final long serialVersionUID = 1L;
        protected JTextArea textArea = new JTextArea();
        protected UndoManager undoManager = new UndoManager();
        protected JButton undoButton = new JButton("Undo");
        protected JButton redoButton = new JButton("Redo");
        public UndoRedoTextArea() {
            super("Undo/Redo Demo");
            undoButton.setEnabled(false);
            redoButton.setEnabled(false);
            JPanel buttonPanel = new JPanel(new GridLayout());
            buttonPanel.add(undoButton);
            buttonPanel.add(redoButton);
            JScrollPane scroller = new JScrollPane(textArea);
            getContentPane().add(buttonPanel, BorderLayout.NORTH);
            getContentPane().add(scroller, BorderLayout.CENTER);
            textArea.getDocument().addUndoableEditListener(
                new UndoableEditListener() {
                    public void undoableEditHappened(UndoableEditEvent e) {
                        undoManager.addEdit(e.getEdit());
                        updateButtons();
            undoButton.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    try {
                        undoManager.undo();
                    } catch (CannotRedoException cre) {
                        cre.printStackTrace();
                    updateButtons();
            undoButton.addKeyListener(this);
            redoButton.addKeyListener(this);
            redoButton.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    try {
                        undoManager.redo();
                    } catch (CannotRedoException cre)  {
                        cre.printStackTrace();
                    updateButtons();
            setSize(400, 300);
            setVisible(true);
        public void updateButtons() {
            undoButton.setText(undoManager.getUndoPresentationName());
            redoButton.setText(undoManager.getRedoPresentationName());
            undoButton.setEnabled(undoManager.canUndo());
            redoButton.setEnabled(undoManager.canRedo());
        public static void main(String argv[]) {
            new UndoRedoTextArea();
        public void keyPressed(KeyEvent e){
            if (e.equals(KeyStroke.getKeyStroke
                (KeyEvent.VK_Z, InputEvent.CTRL_DOWN_MASK))){
                // undo
                try {
                    undoManager.undo();
                } catch (CannotRedoException cre)  {
                    cre.printStackTrace();
                updateButtons();
            else if (e.equals(KeyStroke.getKeyStroke
                    (KeyEvent.VK_Y, InputEvent.CTRL_DOWN_MASK))){
                // redo
                try  {
                    undoManager.redo();
                } catch (CannotRedoException cre) {
                    cre.printStackTrace();
                updateButtons();
        public void keyTyped(KeyEvent e){}
        public void keyReleased(KeyEvent e){}
    }Edited by: G-Unit on Oct 24, 2010 5:30 AM

    camickr wrote:
    So the way I posted in the second lump of code OK (3rd post) or did you mean something different? Why did you set the key bindings? Did I not state they would be created automatically? I think you need to reread my suggestion (and the tutorial).Because I don't get it, it says only Menu items can contain accelerators and buttons only get mnemonics. I'm not using menu items here, I only have a text pane and 2 buttons. So I set the actions for the InputMap in TextPane. For the buttons, I pretty much used the small bit of code using undoManager.
    I tried to set KEYSTROKE constructor for the action and simply add them to the buttons that way, but this didn't seem to have any response.
    Also I don't get how this could happen anyway if the TextPane has the focus.
    Not like the example using MNEMONICS.
        Action leftAction = new LeftAction(); //LeftAction code is shown later
        button = new JButton(leftAction)
        menuItem = new JMenuItem(leftAction);
    To create an Action object, you generally create a subclass of AbstractAction and then instantiate it. In your subclass, you must implement the actionPerformed method to react appropriately when the action event occurs. Here's an example of creating and instantiating an AbstractAction subclass:
        leftAction = new LeftAction("Go left", anIcon,
                     "This is the left button.",
                     new Integer(KeyEvent.VK_L));
        class LeftAction extends AbstractAction {
            public LeftAction(String text, ImageIcon icon,
                              String desc, Integer mnemonic) {
                super(text, icon);
                putValue(SHORT_DESCRIPTION, desc);
                putValue(MNEMONIC_KEY, mnemonic);
            public void actionPerformed(ActionEvent e) {
                displayResult("Action for first button/menu item", e);
        }This is what I attempted. No errors... It just doesn't work.
    public JPanel p()
        undoButton.addActionListener(new UndoAction(KeyStroke.getKeyStroke(KeyEvent.VK_Z, Event.CTRL_MASK)));
        panel.add(undoButton);
        return panel;
    private class UndoAction extends AbstractAction
         public UndoAction(KeyStroke keyStroke)
              putValue(ACCELERATOR_KEY, keyStroke);
         private static final long serialVersionUID = 1L;
         public void actionPerformed(ActionEvent e)
              try
                   if (undoManager.canUndo())
                        undoManager.undo();
              catch (CannotRedoException cre)
                   cre.printStackTrace();
              updateButtons();
    }Edited by: G-Unit on Oct 25, 2010 8:32 AM

  • Undo/Redo help please...

    I want to include undo/redo capabilities in my app. All the examples and code that I've seen deals with text. Can undo/redo handle undoing the move of an object(from one side of screen to the other), undoing the adding of a label or panel to a frame, etc..? If so could someone point me in the right direction or post some sample code.
    thanks...

    how do i redraw the contents of a panel again. I don't know about the internals of your program. I just described a general approach to undo levels.
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    Don't post the same question repeatedly. I've removed the thread you started 4 days after this one with the identical same question.
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