通过add event listener的方式获取当前点击的控件的信息。
可依据html中element的属性 https://www.w3school.com.cn/jsref/dom_obj_all.asp
import com.vaadin.flow.dom.DomEvent;
import elemental.json.JsonObject;
Tab tab = new Tab("my tab");
tab.getElement().addEventListener("click", this::handleClick)
.addEventData("element.offsetTop")
.addEventData("element.offsetLeft")
.addEventData("element.offsetWidth")
.addEventData("element.offsetHeight")
.addEventData("element.id");
private void handleClick(DomEvent event) {
JsonObject eventData = event.getEventData();
double top = eventData.getNumber("element.offsetTop");
double left = eventData.getNumber("element.offsetLeft");
double width = eventData.getNumber("element.offsetWidth");
double height &