Cocostudio UI控件中的事件,如何获得触摸坐标

UIButton* button = UIButton::create();

button->addTouchEventListener(this, toucheventselector(HelloWorld::touchEvent));

void HelloWorld::touchEvent(CCObject *pSender, TouchEventType type) {}

函数touchEvent内如何能获取到触摸点x, y?

竟然让我找到了Widget上的getTouchStartPos