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Drag and Drop example snippet

/*  * Drag and Drop example snippet: drag text between two labels  *  * For a list of all SWT example snippets see  * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#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 Snippet78 {   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);     label1.setText("TEXT");     final Label label2 = new Label(shell, SWT.BORDER);     setDragDrop(label1);     setDragDrop(label2);     shell.setSize(200, 200);     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch())         display.sleep();     }     display.dispose();   }   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.setTransfer(types);     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)           label.setText("");       }     });     DropTarget target = new DropTarget(label, operations);     target.setTransfer(types);     target.addDropListener(new DropTargetAdapter() {       public void drop(DropTargetEvent event) {         if (event.data == null) {           event.detail = DND.DROP_NONE;           return;         }         label.setText((String) event.data);       }     });   } }