Undo Editor : Redo Undo « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. Redo Undo

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

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.event.UndoableEditEvent;
import javax.swing.event.UndoableEditListener;
import javax.swing.undo.UndoManager;

public class UndoEditor extends JFrame {
  private UndoManager undoManager = new UndoManager();
  private JMenuBar menuBar = new JMenuBar();
  private JMenu editMenu = new JMenu("Edit");
  private UndoAction undoAction = new UndoAction();
  private RedoAction redoAction = new RedoAction();

  public UndoEditor() {
    setLayout(new BorderLayout());
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JTextPane editor = new JTextPane();
    editor.getDocument().addUndoableEditListener(new UndoListener());

    JScrollPane scroller = new JScrollPane(editor);
    menuBar.add(editMenu);
    editMenu.add(undoAction);
    editMenu.add(redoAction);
    this.setJMenuBar(menuBar);
    add(scroller);
    setSize(400, 300);
    setVisible(true);
  }

  public static void main(String[] args) {
    new UndoEditor();
  }

  class UndoListener implements UndoableEditListener {
    public void undoableEditHappened(UndoableEditEvent e) {
      undoManager.addEdit(e.getEdit());
      undoAction.update();
      redoAction.update();
    }
  }

  class UndoAction extends AbstractAction {
    public UndoAction() {
      this.putValue(Action.NAME, undoManager.getUndoPresentationName());
      this.setEnabled(false);
    }

    public void actionPerformed(ActionEvent e) {
      if (this.isEnabled()) {
        undoManager.undo();
        undoAction.update();
        redoAction.update();
      }
    }

    public void update() {
      this.putValue(Action.NAME, undoManager.getUndoPresentationName());
      this.setEnabled(undoManager.canUndo());
    }
  }

  class RedoAction extends AbstractAction {
    public RedoAction() {
      this.putValue(Action.NAME, undoManager.getRedoPresentationName());
      this.setEnabled(false);
    }

    public void actionPerformed(ActionEvent e) {
      if (this.isEnabled()) {
        undoManager.redo();
        undoAction.update();
        redoAction.update();
      }
    }

    public void update() {
      this.putValue(Action.NAME, undoManager.getRedoPresentationName());
      this.setEnabled(undoManager.canRedo());
    }
  }
}

14.113.Redo Undo
	14.113.1.	Undo Editor
	14.113.2.	Using the Undo Framework with Swing Text Components
	14.113.3.	Undoable Drawing
	14.113.4.	Adding Undo and Redo to a Text Component
	14.113.5.	Bind the undo action to ctl-Z
	14.113.6.	Create a redo action and add it to the text component (JTextComponent)
	14.113.7.	Listen for undo and redo events
	14.113.8.	Create an undo action and add it to the text component