Add Undo and Redo to a text component

  

import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.JTextArea;
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;

public class Main {
  public static void main(String[] argv) throws Exception {
    JTextComponent textcomp = new JTextArea();
    final UndoManager undo = new UndoManager();
    Document doc = textcomp.getDocument();

    doc.addUndoableEditListener(new UndoableEditListener() {
      public void undoableEditHappened(UndoableEditEvent evt) {
        undo.addEdit(evt.getEdit());
      }
    });
    textcomp.getActionMap().put("Undo", new AbstractAction("Undo") {
      public void actionPerformed(ActionEvent evt) {
        try {
          if (undo.canUndo()) {
            undo.undo();
          }
        } catch (CannotUndoException e) {
        }
      }
    });
    textcomp.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");
    textcomp.getActionMap().put("Redo", new AbstractAction("Redo") {
      public void actionPerformed(ActionEvent evt) {
        try {
          if (undo.canRedo()) {
            undo.redo();
          }
        } catch (CannotRedoException e) {
        }
      }
    });
    textcomp.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo");
  }
}

1.	The use of UndoableToggleEdit
2.	The use of StateEdit(able)
3.	The use of UndoManager
4.	A sample app showing the use of UndoableToggleEdit and CompoundEdit
5.	An example that shows lots of little UndoManager details
6.	Undo redo textarea
7.	Undo manager
8.	Simple GUI demo of UndoManager and friends
9.	Undo Example 1
10.	Undo Example 2
11.	Undo Example 3
12.	Undo Example 4
13.	Undo Example 5
14.	Undo Example 6
15.	Undoable Drawing Panel 2
16.	Undo Drawing
17.	Undo Example 7
18.	Creating TextArea with Undo, Redo Capabilities
19.	Add undo support to the StyleFrame example
20.	Adding Undo and Redo to a Text Component
21.	Create a redo action and add it to the text component (JTextComponent)
22.	Listen for undo and redo events
23.	Create an undo action and add it to the text component
24.	Bind the undo action to ctl-Z

Add Undo and Redo to a text component : Undo Redo « Swing JFC « Java

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