Document: addUndoableEditListener(UndoableEditListener listener) : Document « javax.swing.text « Java by API

1. Java by API
2. javax.swing.text
3. Document

Document: addUndoableEditListener(UndoableEditListener listener)

 
import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextPane;
import javax.swing.event.UndoableEditEvent;
import javax.swing.event.UndoableEditListener;
import javax.swing.undo.UndoableEdit;

public class UndoStyleFrame extends JFrame {

  protected UndoAct undoAction = new UndoAct();

  protected RedoAct redoAction = new RedoAct();

  public UndoStyleFrame() {
    super();
    setTitle("UndoStyleFrame");
    JTextPane textPane = new JTextPane();

    textPane.getDocument().addUndoableEditListener(undoAction);
    textPane.getDocument().addUndoableEditListener(redoAction);

    JMenu editMenu = new JMenu("Edit");
    editMenu.add(new JMenuItem(undoAction));
    editMenu.add(new JMenuItem(redoAction));

    JMenuBar menuBar = new JMenuBar();
    menuBar.add(editMenu);

    setJMenuBar(menuBar);

    JPanel buttonPanel = new JPanel();
    buttonPanel.add(new JButton(undoAction));
    buttonPanel.add(new JButton(redoAction));
    
    getContentPane().add(textPane, "Center");
    getContentPane().add(buttonPanel, "South");
  }
  public class UndoAct extends AbstractAction implements UndoableEditListener {
    private UndoableEdit edit;

    public UndoAct() {
      super("Undo");
      setEnabled(false);
    }

    public void updateEnabled() {
      setEnabled(edit.canUndo());
    }

    public void undoableEditHappened(UndoableEditEvent event) {
      edit = event.getEdit();
      putValue(NAME, edit.getUndoPresentationName());
      updateEnabled();
    }

    public void actionPerformed(ActionEvent ae) {
      edit.undo();
      updateEnabled(); 
      redoAction.updateEnabled(); 
    }
  }

  public class RedoAct extends AbstractAction implements UndoableEditListener {
    private UndoableEdit edit;

    public RedoAct() {
      super("Redo");
      setEnabled(false);
    }

    public void updateEnabled() {
      setEnabled(edit.canRedo());
    }

    public void undoableEditHappened(UndoableEditEvent event) {
      edit = event.getEdit();
      putValue(NAME, edit.getRedoPresentationName());
      updateEnabled();
    }

    public void actionPerformed(ActionEvent ae) {
      edit.redo();
      updateEnabled(); 
      undoAction.updateEnabled();
    }
  }
  public static void main(String[] args) {
    JFrame frame = new UndoStyleFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 300);
    frame.setVisible(true);
  }
}

           
         
  

Related examples in the same category