/**-----------------------------------------------------------------------------------------
* Copyright © 2026 Progress Software Corporation. All rights reserved.
* Licensed under commercial license. See LICENSE.md in the project root for more information
*-------------------------------------------------------------------------------------------*/
import { GridItem } from '../../data/grid-item.interface';
import { GroupRange, StickyGroupItem } from './models';
/**
 * @hidden
 * Builds a map of group ranges from the flat data array.
 * Each group header maps to its footer and child range.
 */
export declare function buildGroupRangeMap(flatDataArray: GridItem[]): Map<number, GroupRange>;
/**
 * @hidden
 * Selects which group headers should be sticky at the top of the viewport.
 * A header is sticky when it is scrolled above the viewport but its group
 * children are still visible below.
 */
export declare function computeStickyItems(flatDataArray: GridItem[], groupRanges: Map<number, GroupRange>, firstVisibleIndex: number, lastVisibleIndex: number, rawFirstVisibleIndex?: number): StickyGroupItem[];
/**
 * @hidden
 * Selects which group footers should be sticky at the bottom of the viewport.
 * A footer is sticky when it is scrolled below the viewport but its group's
 * header or first child is still visible above.
 */
export declare function computeStickyFooterItems(flatDataArray: GridItem[], groupRanges: Map<number, GroupRange>, firstVisibleIndex: number, lastVisibleIndex: number): StickyGroupItem[];
/**
 * @hidden
 * Returns true if the displayed groups differ between current and previous arrays.
 */
export declare function hasStickyItemsChanged(current: StickyGroupItem[], prev: StickyGroupItem[]): boolean;
/**
 * @hidden
 * Computes push offsets for sticky header overlay rows.
 * When a group's boundary approaches the sticky slot, the header is pushed upward.
 */
export declare function computeHeaderPush(indices: number[], getRowHeight: (flatIndex: number) => number, getRowOffset: (flatIndex: number) => number | undefined, scrollTop: number, groupRanges: Map<number, GroupRange>): {
    totalHeight: number;
    offsets: number[];
};
/**
 * @hidden
 * Computes push offsets for sticky footer overlay rows.
 * When a group's header approaches the sticky footer slot, the footer is pushed downward.
 */
export declare function computeFooterPush(indices: number[], getRowHeight: (flatIndex: number) => number, getRowOffset: (flatIndex: number) => number | undefined, scrollTop: number, viewportHeight: number, footerRanges: Map<number, GroupRange>): {
    totalHeight: number;
    offsets: number[];
};
/**
 * @hidden
 * Applies push transforms to sticky header overlay rows.
 * Negative push values slide rows up with clipPath.
 * Iterates each tbody independently so locked and non-locked tables
 * both receive the same transforms.
 */
export declare function applyHeaderPushTransforms(containerEl: HTMLElement, pushOffsets: number[]): void;
/**
 * @hidden
 * Applies push transforms to sticky footer overlay rows.
 * Positive push values clip from the bottom. The footer container is bottom-anchored,
 * so reducing its height shifts content down. Non-pushed rows are translated up to compensate.
 * Iterates each tbody independently so locked and non-locked tables
 * both receive the same transforms.
 */
export declare function applyFooterPushTransforms(containerEl: HTMLElement, pushOffsets: number[]): void;
/**
 * @hidden
 * Resets all push transform styles on rows within a sticky container.
 */
export declare function resetRowTransforms(containerEl: HTMLElement): void;