import { Column } from '../models/Column';
export interface IndexRange {
    first: number;
    /** Inclusive. `last < first` means the range is empty. */
    last: number;
}
/**
 * Maps between pixels and row/column indices.
 *
 * Rows use a uniform height, so row math is O(1) and scales to millions of rows
 * without allocating a per-row array. Columns have individual widths, so their
 * left edges are kept as a cumulative array and located with binary search.
 */
export declare class LayoutEngine {
    private _rowCount;
    private rowHeight;
    private colLefts;
    constructor(rowCount: number, rowHeight: number, columns: Column[]);
    get rowCount(): number;
    get colCount(): number;
    get totalHeight(): number;
    get totalWidth(): number;
    getRowTop(row: number): number;
    getRowHeight(_row: number): number;
    getColLeft(col: number): number;
    getColWidth(col: number): number;
    /** Total width of the first `count` columns (the frozen band). */
    frozenColsWidth(count: number): number;
    /** Total height of the first `count` rows (the frozen band). */
    frozenRowsHeight(count: number): number;
    getVisibleRows(scrollTop: number, viewportHeight: number): IndexRange;
    getVisibleCols(scrollLeft: number, viewportWidth: number): IndexRange;
    rowAtY(y: number): number;
    colAtX(x: number): number;
    setRowCount(rowCount: number): void;
    setColumns(columns: Column[]): void;
}