在jface的tableviewer中，怎么通过双击事件得到点击的是哪个单元格？

我来试试：

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
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 Test {

public static void main(String[] args) {

Display display = new Display();
final Shell shell = new Shell(display);
shell.setSize(450, 300);
shell.setText("Test");

final Label label = new Label(shell, SWT.NONE);
label.setBounds(50, 178, 311, 60);

TableViewer tableViewer = new TableViewer(shell, SWT.BORDER
| SWT.FULL_SELECTION);
final Table tabl