如何将鼠标悬停在SWT组合框中的项目上(热跟踪)

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class ComboHoverExample {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());

        Combo combo = new Combo(shell, SWT.DROP_DOWN);
        combo.setItems(new String[]{"Item 1", "Item 2", "Item 3"});

        combo.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseMove(MouseEvent e) {
                int index = combo.getSelectionIndex();
                if (index != -1) {
                    String selectedItem = combo.getItem(index);
                    // 在这里执行鼠标悬停时的操作，例如显示提示信息
                    System.out.println("鼠标悬停在项目上：" + selectedItem);
                }
            }
        });

        shell.pack();
        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }

        display.dispose();
    }
}