Function onScroll

src/MessageList/MessageList.tsx:98–116

(e: React.UIEvent<HTMLElement>)

  }

  const onScroll = (e: React.UIEvent<HTMLElement>): void => {
    var bottom = getBottom(e.currentTarget)
    setScrollBottom(bottom)
    if (toBottomHeight === '100%' || (toBottomHeight && bottom > toBottomHeight)) {
      if (_downButton !== true) {
        setDownButton(true)
        setScrollBottom(bottom)
      }
    } else {
      if (_downButton !== false) {
        setDownButton(false)
        setScrollBottom(bottom)
      }
    }

    if (props.onScroll instanceof Function) {
      props.onScroll(e)
    }
  }

  const toBottom = (e: any) => {
    if (!referance) return