export interface ViewportInfo {
    height: number;
    width: number;
    hasVScroll: boolean;
    hasHScroll: boolean;
    headerHeight: number;
    groupingPanelHeight: number;
    virtualHeight: number;
    realScrollHeight: number;
    topPanelHeight: number;
    headerRowHeight: number;
    footerRowHeight: number;
    numVisibleRows: number;
}