Undo redo textarea : Undo Redo « Swing JFC « Java

Undo redo textarea

 
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
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 {
  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();
      }
    });

    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();
  }
}

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 manager
7.	Simple GUI demo of UndoManager and friends
8.	Undo Example 1
9.	Undo Example 2
10.	Undo Example 3
11.	Undo Example 4
12.	Undo Example 5
13.	Undo Example 6
14.	Undoable Drawing Panel 2
15.	Undo Drawing
16.	Undo Example 7
17.	Creating TextArea with Undo, Redo Capabilities
18.	Add Undo and Redo to a text component
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

Undo redo textarea : Undo Redo « Swing JFC « Java

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