Re: JEditorPane question

Jeff Higgins <jeff@invalid.invalid>
Mon, 08 Dec 2014 23:11:38 -0500
This one with a TransferHandler allows
me to consistently copy/paste with crlf.
Modified from Java Tutorial.

That ignorant comment kinda pissed me off.

package bluesg.sandbox;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.KeyEvent;

import javax.swing.JComponent;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JEditorPane;
import javax.swing.TransferHandler;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultEditorKit;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.Position;

public class JEditorPaneTest {
   JFrame frame = null;

   public static void main(String[] a) throws FileNotFoundException,
       UnsupportedEncodingException {
     (new JEditorPaneTest()).test();

   private void test() throws FileNotFoundException,
       UnsupportedEncodingException {
     TransferHandler th = new TextTransferHandler();
     frame = new JFrame("JEditorPane Test");
     frame.setSize(300, 200);
     JEditorPane pane = new JEditorPane();
     pane.setText("Lorem ipsum dolor sit amet, consectetur adipiscing
         + "Nunc pellentesque quam et justo fringilla, eu gravida nunc
     String test = pane.getText();
     new PrintWriter("LoremIpsum", "UTF-8").printf(test);


   public JMenuBar createMenuBar() {
     JMenuItem menuItem = null;
     JMenuBar menuBar = new JMenuBar();
     JMenu mainMenu = new JMenu("Edit");

     menuItem = new JMenuItem(new DefaultEditorKit.CutAction());

     menuItem = new JMenuItem(new DefaultEditorKit.CopyAction());

     menuItem = new JMenuItem(new DefaultEditorKit.PasteAction());

     return menuBar;

   class TextTransferHandler extends TransferHandler {
     // Start and end position in the source text.
     // We need this information when performing a MOVE
     // in order to remove the dragged text from the source.
     Position p0 = null, p1 = null;

      * Perform the actual import.
      * This method supports both drag and drop and
      * cut/copy/paste.
     public boolean importData(TransferHandler.TransferSupport support) {
       // If we can't handle the import, bail now.
       if (!canImport(support)) {
         return false;

       // Fetch the data -- bail if this fails
       String data;
       try {
         data = (String) support.getTransferable().getTransferData(
       } catch (UnsupportedFlavorException e) {
         return false;
       } catch ( e) {
         return false;

       JEditorPane tc = (JEditorPane) support.getComponent();
       return true;

      * Bundle up the data for export.
     protected Transferable createTransferable(JComponent c) {
       JEditorPane source = (JEditorPane) c;
       int start = source.getSelectionStart();
       int end = source.getSelectionEnd();
       Document doc = source.getDocument();
       doc.putProperty(DefaultEditorKit.EndOfLineStringProperty, "\r\n");
       if (start == end) {
         return null;
       try {
         p0 = doc.createPosition(start);
         p1 = doc.createPosition(end);
       } catch (BadLocationException e) {
             .println("Can't create position - unable to remove text
from source.");
       String data = source.getText().substring(start, end);
       return new StringSelection(data);

      * These text fields handle both copy and move actions.
     public int getSourceActions(JComponent c) {
       return COPY_OR_MOVE;

      * When the export is complete, remove the old text if the action was a
      * move.
     protected void exportDone(JComponent c, Transferable data, int
action) {
       if (action != MOVE) {

       if ((p0 != null) && (p1 != null) && (p0.getOffset() !=
p1.getOffset())) {
         try {
           JTextComponent tc = (JTextComponent) c;
               p1.getOffset() - p0.getOffset());
         } catch (BadLocationException e) {
           System.out.println("Can't remove text from source.");

      * We only support importing strings.
     public boolean canImport(TransferHandler.TransferSupport support) {
       // we only import Strings
       if (!support.isDataFlavorSupported(DataFlavor.stringFlavor)) {
         return false;
       return true;


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