import type { PositionCache } from '../utils/positionCache';
import type { ViewportBaseCalculator } from './viewportBase';
export interface AxisCalculatorContext extends ViewportBaseCalculator {
    needReverse: boolean;
    lastProcessedIndex: number;
}
export interface AxisCalculationParams<T extends AxisCalculatorContext = AxisCalculatorContext> {
    totalCount: number;
    zeroBasedScrollOffset: number;
    scrollEnd: number;
    positionCache: PositionCache;
    setSizeField: (ctx: T, size: number) => void;
    setTotalCalculated: (ctx: T, value: number) => void;
    getTotalCalculated: (ctx: T) => number;
}
/**
 * Shared axis calculation used by both row and column viewport calculators.
 *
 * Iterates through items (rows or columns) starting from the cache-derived
 * skip position, fills `startPositions`, and delegates to the calculation
 * types via the `_process` / `_initialize` / `_finalize` callbacks on the
 * provided context.
 *
 * @param {object} context The viewport calculator instance (rows or columns).
 * @param {object} params Parameters that differ between the row and column axes.
 * @param {number} params.totalCount Total number of items.
 * @param {number} params.zeroBasedScrollOffset Clamped scroll offset (>= 0).
 * @param {number} params.scrollEnd Pixel threshold at which iteration stops
 *   (rows: `innerViewportHeight`, columns: `zeroBasedScrollOffset + viewportWidth`).
 * @param {PositionCache} params.positionCache Built prefix sum cache.
 * @param {Function} params.setSizeField Callback `(ctx, size) => {}` that writes the
 *   per-item size onto the context (e.g. `ctx.rowHeight = size`).
 * @param {Function} params.setTotalCalculated Callback `(ctx, value) => {}` that writes
 *   the running cumulative total onto the context.
 * @param {Function} params.getTotalCalculated Callback `(ctx) => number` that reads the
 *   running cumulative total from the context.
 */
export declare function calculateAxis<T extends AxisCalculatorContext>(context: T, { totalCount, zeroBasedScrollOffset, scrollEnd, positionCache, setSizeField, setTotalCalculated, getTotalCalculated, }: AxisCalculationParams<T>): void;