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Drag and Drop inside Table

import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.DragSource; import org.eclipse.swt.dnd.DragSourceAdapter; import org.eclipse.swt.dnd.DragSourceEvent; 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.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; public class DragDropTable {   public static void main(String[] args) {     Display display = new Display();     Shell shell = new Shell(display);     shell.setLayout(new FillLayout());          Table table = new Table(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);     Transfer[] types = new Transfer[] { TextTransfer.getInstance() };     DragSource source = new DragSource(table, DND.DROP_MOVE | DND.DROP_COPY);     source.setTransfer(types);          source.addDragListener(new DragSourceAdapter() {       public void dragSetData(DragSourceEvent event) {         // Get the selected items in the drag source         DragSource ds = (DragSource) event.widget;         Table table = (Table) ds.getControl();         TableItem[] selection = table.getSelection();         StringBuffer buff = new StringBuffer();         for (int i = 0, n = selection.length; i < n; i++) {           buff.append(selection[i].getText());         }          event.data = buff.toString();       }     });     // Create the drop target     DropTarget target = new DropTarget(table, DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT);     target.setTransfer(types);     target.addDropListener(new DropTargetAdapter() {       public void dragEnter(DropTargetEvent event) {         if (event.detail == DND.DROP_DEFAULT) {           event.detail = (event.operations & DND.DROP_COPY) != 0 ? DND.DROP_COPY : DND.DROP_NONE;         }         // Allow dropping text only         for (int i = 0, n = event.dataTypes.length; i < n; i++) {           if (TextTransfer.getInstance().isSupportedType(event.dataTypes[i])) {             event.currentDataType = event.dataTypes[i];           }         }       }       public void dragOver(DropTargetEvent event) {          event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;       }       public void drop(DropTargetEvent event) {         if (TextTransfer.getInstance().isSupportedType(event.currentDataType)) {           // Get the dropped data           DropTarget target = (DropTarget) event.widget;           Table table = (Table) target.getControl();           String data = (String) event.data;           // Create a new item in the table to hold the dropped data           TableItem item = new TableItem(table, SWT.NONE);           item.setText(new String[] { data });           table.redraw();         }       }     });     TableColumn column = new TableColumn(table, SWT.NONE);     // Seed the table     TableItem item = new TableItem(table, SWT.NONE);     item.setText(new String[] { "A" });     item = new TableItem(table, SWT.NONE);     item.setText(new String[] { "B" });     item = new TableItem(table, SWT.BORDER);     item.setText(new String[] { "C" });     column.pack();     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }