有没有办法在GWT中捕获键盘事件？

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyDownEvent;
import com.google.gwt.event.dom.client.KeyDownHandler;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Label;

public class KeyboardEventExample implements EntryPoint {

    @Override
    public void onModuleLoad() {
        // 创建一个标签，用于显示捕获到的键盘事件信息
        final Label label = new Label();
        RootPanel.get().add(label);

        // 为根面板添加键盘事件监听器
        RootPanel.get().addKeyDownHandler(new KeyDownHandler() {
            @Override
            public void onKeyDown(KeyDownEvent event) {
                // 获取按下的键的键码
                int keyCode = event.getNativeKeyCode();

                // 根据键码判断按下的是哪个键，并在标签中显示相应的信息
                switch (keyCode) {
                    case KeyCodes.KEY_ENTER:
                        label.setText("Enter key pressed");
                        break;
                    case KeyCodes.KEY_ESCAPE:
                        label.setText("Escape key pressed");
                        break;
                    case KeyCodes.KEY_DELETE:
                        label.setText("Delete key pressed");
                        break;
                    default:
                        label.setText("Key code: " + keyCode);
                }
            }
        });
    }
}