Drag text between two labels : SWT Drag Drop « SWT « Java Tutorial

Drag text between two labels
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * Contributors:
 *     IBM Corporation - initial API and implementation

 * Drag and Drop example snippet: drag text between two labels
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.dnd.DropTargetAdapter;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

public class DragDropBetweenLabels {

  public static void main(String[] args) {

    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final Label label1 = new Label(shell, SWT.BORDER);
    final Label label2 = new Label(shell, SWT.BORDER);
    shell.setSize(200, 200);
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())

  public static void setDragDrop(final Label label) {

    Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
    int operations = DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK;

    final DragSource source = new DragSource(label, operations);
    source.addDragListener(new DragSourceListener() {
      public void dragStart(DragSourceEvent event) {
        event.doit = (label.getText().length() != 0);

      public void dragSetData(DragSourceEvent event) {
        event.data = label.getText();

      public void dragFinished(DragSourceEvent event) {
        if (event.detail == DND.DROP_MOVE)

    DropTarget target = new DropTarget(label, operations);
    target.addDropListener(new DropTargetAdapter() {
      public void drop(DropTargetEvent event) {
        if (event.data == null) {
          event.detail = DND.DROP_NONE;
        label.setText((String) event.data);

17.114.SWT Drag Drop
17.114.1.Dragging and Dropping
17.114.2.Drag selected text in Text to LabelDrag selected text in Text to Label
17.114.3.Drag and Drop inside TableDrag and Drop inside Table
17.114.4.Drag and Drop example snippet: determine data types available (win32 only)Drag and Drop example snippet: determine data types available (win32 only)
17.114.5.Drag and Drop: define a default operation (in this example, Copy)Drag and Drop: define a default operation (in this example, Copy)
17.114.6.Drag and Drop: define my own data transfer typeDrag and Drop: define my own data transfer type
17.114.7.Drag leaf items in a treeDrag leaf items in a tree
17.114.8.Drag text between two labelsDrag text between two labels
17.114.9.Drag and Drop: determine native data types available (motif only)
17.114.10.Make a dropped data type depend on a target item in tableMake a dropped data type depend on a target item in table