import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.text.*;

import javax.swing.event.*;

import javax.swing.undo.*;

public class CompoundUndoManagerDemo

{

public static void main(String[] args)

{

SwingUtilities.invokeLater(new Runnable() {

public void run() {

createAndShowGUI();

}

});

}

public static void createAndShowGUI()

{

// Create a simple toolbar

JToolBar toolBar = new JToolBar();

toolBar.add( createButtonFromAction( new StyledEditorKit.BoldAction() ) );

toolBar.add( createButtonFromAction( new StyledEditorKit.ItalicAction() ) );

toolBar.add( createButtonFromAction( new StyledEditorKit.UnderlineAction() ) );

// Create a text pane

final JTextPane textPane = new JTextPane();

textPane.setPreferredSize( new Dimension(200, 200) );

String text =

"public class SomeClass\n" +

"{\n\t// Enter code here\n}";

textPane.setText(text);

CompoundUndoManager undoManager = new CompoundUndoManager( textPane );

// Create undo/redo buttons

JPanel buttons = new JPanel();

JButton undo = new JButton(undoManager.getUndoAction());

buttons.add( undo );

JButton redo = new JButton(undoManager.getRedoAction());

buttons.add( redo );

// Add components to the frame

JPanel main = new JPanel();

main.setLayout( new BorderLayout() );

main.add(toolBar, BorderLayout.NORTH);

main.add( new JScrollPane(textPane), BorderLayout.CENTER );

main.add(buttons, BorderLayout.SOUTH);

JFrame frame = new JFrame("Compound Undo Manager");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add(main);

frame.setSize(450, 240);

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

private static JButton createButtonFromAction(Action action)

{

JButton button = new JButton( action );

button.setRequestFocusEnabled(false);

return button;

}

}