ScrollMetricsScrollMetricsPropertiesheightscrollLeftscrollPaddingBottomscrollPaddingRightscrollPaddingTopscrollPaddingleftscrollTopwidthxyheightheight: numberscrollLeftscrollLeft: numberscrollPaddingBottomscrollPaddingBottom: numberscrollPaddingRightscrollPaddingRight: numberscrollPaddingTopscrollPaddingTop: numberscrollPaddingleftscrollPaddingleft: numberscrollTopscrollTop: numberwidthwidth: numberxx: numberyy: number