export interface ScaffoldConfig {
    showColumnHeader: boolean;
    showRowHeader: boolean;
    headerHeight: number;
    rowHeaderWidth: number;
    showGroupPanel: boolean;
    groupPanelHeight: number;
    /** Height of the multi-level column-group header band. 0 (default) when there are no groups. */
    columnGroupHeight?: number;
}
/**
 * Builds and owns the static DOM scaffold using a single-scroller model:
 * one scroll container holds everything, so the native scrollbars span the whole
 * grid. The data cells scroll normally; the column header, row header, and
 * top-left corner are `position: sticky` panels that the browser keeps pinned on
 * the compositor as the canvas scrolls (header pins vertically, row header
 * horizontally, corner both) — no per-frame JS, so they never flicker. A gutter
 * (rowHeaderWidth × headerHeight) is reserved at the top-left so the cells start
 * past the headers.
 */
export declare class ViewportRenderer {
    private host;
    readonly viewport: HTMLElement;
    readonly canvas: HTMLElement;
    readonly cells: HTMLElement;
    readonly mergeLayer: HTMLElement;
    readonly headerInner: HTMLElement;
    /** Top header band holding multi-level column-group cells. Present only when there are groups. */
    readonly columnGroupInner?: HTMLElement;
    readonly rowHeaderInner: HTMLElement;
    readonly gutterLeft: number;
    readonly gutterTop: number;
    /** Host bar for the grouping panel, present only when it is enabled. */
    readonly groupPanel?: HTMLElement;
    readonly frozenCols: HTMLElement;
    readonly frozenColsHeader: HTMLElement;
    readonly frozenRows: HTMLElement;
    readonly frozenRowsHeader: HTMLElement;
    readonly frozenCorner: HTMLElement;
    private corner;
    constructor(host: HTMLElement, config: ScaffoldConfig);
    resize(totalWidth: number, totalHeight: number): void;
    /**
     * Size the pinned body/row-header/frozen-column panels to the visible viewport
     * so they clip their translated content. Called on mount and on resize.
     */
    setViewport(width: number, height: number): void;
    /** Size and show/hide the frozen bands for the current freeze counts. */
    setFrozen(colsWidth: number, rowsHeight: number): void;
    dispose(): void;
}