Java JTextArea registerUndoManager(JTextArea textArea)

Description

register Undo Manager

License

Open Source License

Declaration

public static void registerUndoManager(JTextArea textArea) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

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.undo.CannotRedoException;
import javax.swing.undo.CannotUndoException;
import javax.swing.undo.UndoManager;

public class Main {
    public static void registerUndoManager(JTextArea textArea) {
        final UndoManager undo = new UndoManager();
        Document doc = textArea.getDocument();

        // Listen for undo and redo events
        doc.addUndoableEditListener(new UndoableEditListener() {
            public void undoableEditHappened(UndoableEditEvent evt) {
                undo.addEdit(evt.getEdit());
            }//from   ww w .j  a v a 2  s. c o  m
        });

        // Create an undo action and add it to the text component
        textArea.getActionMap().put("Undo", new AbstractAction("Undo") {
            private static final long serialVersionUID = 1L;

            public void actionPerformed(ActionEvent evt) {
                try {
                    if (undo.canUndo()) {
                        undo.undo();
                    }
                } catch (CannotUndoException e) {
                }
            }
        });

        // Bind the undo action to ctl-Z
        textArea.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");

        // Create a redo action and add it to the text component
        textArea.getActionMap().put("Redo", new AbstractAction("Redo") {
            private static final long serialVersionUID = 1L;

            public void actionPerformed(ActionEvent evt) {
                try {
                    if (undo.canRedo()) {
                        undo.redo();
                    }
                } catch (CannotRedoException e) {
                }
            }
        });

        // Bind the redo action to ctl-Y
        textArea.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo");
    }
}

Related

1. printExceptionInfo(Exception e, JTextArea console)
2. printInfo(JTextArea txtInfo, String infoString)
3. printInTextArea(JTextArea log, String[] toPrint)
4. printStackTrace(Exception e, JTextArea console)
5. printStream(final JTextArea ta)
6. setCaretPosition(int i, int j, JTextArea jtextarea)
7. setCaretPosition(JTextArea ta)
8. setCeil(final JTextArea textArea)
9. setModelValue(JTextArea ta, String value)