Creating TextArea with Undo, Redo Capabilities : Undo Redo « Swing JFC « Java

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Java » Swing JFC » Undo Redo 




Creating TextArea with Undo, Redo Capabilities
  
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
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.CannotUndoException;
import javax.swing.undo.UndoManager;

class UndoableTextArea extends JTextArea implements UndoableEditListener, FocusListener,
    KeyListener {
  private UndoManager m_undoManager;

  public UndoableTextArea() {
    this(new String());
  }

  public UndoableTextArea(String text) {
    super(text);
    getDocument().addUndoableEditListener(this);
    this.addKeyListener(this);
    this.addFocusListener(this);
  }

  private void createUndoMananger() {
    m_undoManager = new UndoManager();
    m_undoManager.setLimit(10);
  }

  private void removeUndoMananger() {
    m_undoManager.end();
  }

  public void focusGained(FocusEvent fe) {
    createUndoMananger();
  }

  public void focusLost(FocusEvent fe) {
    removeUndoMananger();
  }

  public void undoableEditHappened(UndoableEditEvent e) {
    m_undoManager.addEdit(e.getEdit());
  }

  public void keyPressed(KeyEvent e) {
    if ((e.getKeyCode() == KeyEvent.VK_Z&& (e.isControlDown())) {
      try {
        m_undoManager.undo();
      catch (CannotUndoException cue) {
        Toolkit.getDefaultToolkit().beep();
      }
    }

    if ((e.getKeyCode() == KeyEvent.VK_Y&& (e.isControlDown())) {
      try {
        m_undoManager.redo();
      catch (CannotRedoException cue) {
        Toolkit.getDefaultToolkit().beep();
      }
    }
  }

  public void keyReleased(KeyEvent e) {
  }

  public void keyTyped(KeyEvent e) {
  }
}

public class Main extends JFrame {
  UndoableTextArea m_undoableTextArea = new UndoableTextArea();

  public Main() {
    JScrollPane sc = new JScrollPane(m_undoableTextArea);
    getContentPane().setLayout(new BorderLayout(1010));
    getContentPane()
        .add(BorderLayout.NORTH, new JLabel("Press, CTRL+Z to Undo, CTRL+Y to Redo..."));
    getContentPane().add(BorderLayout.CENTER, sc);
  }

  public static void main(String[] arg) {
    Main m = new Main();
    m.setVisible(true);
    m.setSize(new Dimension(400300));
    m.validate();
  }
}

   
    
  














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2.The use of StateEdit(able)The use of StateEdit(able)
3.The use of UndoManagerThe use of UndoManager
4.A sample app showing the use of UndoableToggleEdit and CompoundEditA sample app showing the use of UndoableToggleEdit and CompoundEdit
5.An example that shows lots of little UndoManager detailsAn example that shows lots of little UndoManager details
6.Undo redo textareaUndo redo textarea
7.Undo managerUndo manager
8.Simple GUI demo of UndoManager and friendsSimple GUI demo of UndoManager and friends
9.Undo Example 1Undo Example 1
10.Undo Example 2Undo Example 2
11.Undo Example 3Undo Example 3
12.Undo Example 4Undo Example 4
13.Undo Example 5Undo Example 5
14.Undo Example 6Undo Example 6
15.Undoable Drawing Panel 2Undoable Drawing Panel 2
16.Undo DrawingUndo Drawing
17.Undo Example 7Undo Example 7
18.Add Undo and Redo to a text component
19.Add undo support to the StyleFrame exampleAdd 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
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