又一次被quick中的三套ui系统坑了，每次都找不到cocosstudio的scroll源码在哪里

本来想实现一个类似上拉刷新的功能

结果addEventListener 这个方法试了好多。。才找到

做一下标记吧，省得下次还是找半天

 self.scroll = self.bg:getChildByName("rank_scroll")
 self.scroll:addEventListener(handler(self,self.scrollCallback))

function Rank:scrollCallback(sender,event)    
     
    if event == ccui.ScrollviewEventType.scrollToTop then
        print("scroll top")
    elseif event == ccui.ScrollviewEventType.scrollToBottom then
        print("scroll bottom")
    end

end

ccui.ScrollviewEventType = {
    scrollToTop =  0,scrollToBottom =  1,scrollToLeft = 2,scrollToRight = 3,scrolling = 4,bounceTop = 5,bounceBottom = 6,bounceLeft = 7,bounceRight = 8,}