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SWT DnD (Drag and drop) Composite

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.DropTargetEvent; import org.eclipse.swt.dnd.DropTargetListener; import org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Text; public class Ch12DnDComposite extends Composite {   public Ch12DnDComposite(Composite parent) {     super(parent, SWT.NONE);     FillLayout layout = new FillLayout();     setLayout(layout);     Text leftText = new Text(this, SWT.MULTI);     Text rightText = new Text(this, SWT.MULTI);     createDragSource(leftText);     createDragSource(rightText);     createDropTarget(leftText);     createDropTarget(rightText);   }   private void createDropTarget(final Text targetText) {     Transfer[] types = new Transfer[] { TextTransfer.getInstance() };     DropTarget dropTarget = new DropTarget(targetText, DND.DROP_COPY);     dropTarget.setTransfer(types);     dropTarget.addDropListener(new DropTargetListener() {       public void dragEnter(DropTargetEvent event) {       }       public void dragLeave(DropTargetEvent event) {       }       public void dragOperationChanged(DropTargetEvent event) {       }       public void dragOver(DropTargetEvent event) {       }       public void drop(DropTargetEvent event) {         String data = (String) event.data;         targetText.append(data);       }       public void dropAccept(DropTargetEvent event) {       }     });   }   private void createDragSource(final Text sourceText) {     Transfer[] types = new Transfer[] { TextTransfer.getInstance() };     DragSource dragSource = new DragSource(sourceText, DND.DROP_COPY);     dragSource.setTransfer(types);     dragSource.addDragListener(new DragSourceListener() {       public void dragStart(DragSourceEvent event) {         if (sourceText.getSelectionText().length() > 0) {           event.doit = true;         }       }       public void dragSetData(DragSourceEvent event) {         event.data = sourceText.getSelection();       }       public void dragFinished(DragSourceEvent event) {         //do nothing       }     });   } }