import { RadiantElement } from '@ecopages/radiant';
import type { EventEmitter } from '@ecopages/radiant/tools/event-emitter';
export type RuiTreegridProps = {
    label?: string;
    /** Selected row `data-row-id`. */
    value?: string;
};
export type RuiTreegridChangeDetail = {
    rowId: string;
    columnIndex: number;
};
type RuiTreegridBindings = {
    label: string;
};
/**
 * `<rui-treegrid>` — a hierarchical grid navigated with arrow keys.
 *
 * Implements a read-only APG Treegrid: rows may expand/collapse to reveal child
 * rows, and `role="gridcell"` descendants are focused with roving tabindex.
 *
 * Expand/collapse with ArrowRight/ArrowLeft only from the first cell of a row
 * (APG cell-only focus). Enter or click on that cell toggles expansion; Space selects.
 *
 * @summary Read-only treegrid with cell-only roving-tabindex navigation.
 *
 * @see https://www.w3.org/WAI/ARIA/apg/patterns/treegrid/
 *
 * @element rui-treegrid
 *
 * @attr {string} label - Accessible name for the treegrid.
 * @attr {string} value - Selected row's `data-row-id`. Default: `''`.
 *
 * @fires rui-change - Emitted with `{ rowId, columnIndex }` when a cell activates.
 *
 * @cssclass rui-treegrid - Root surface (`role="treegrid"`).
 *
 * @remarks
 * Row/cell/group classes are authored by the `RuiTreegrid` view. The host owns
 * expand/collapse (`aria-expanded` + `hidden` on `role="rowgroup"`) and
 * cell-only roving-tabindex focus.
 */
export declare class RuiTreegrid extends RadiantElement<RuiTreegridBindings> {
    label: string;
    value: string;
    changeEvent: EventEmitter<RuiTreegridChangeDetail>;
    private getDataRows;
    private getVisibleRows;
    private getRowCells;
    private getVisibleCells;
    private getParentRow;
    private syncExpanded;
    private syncSelection;
    protected onConnected(): void;
    onValueUpdated(): void;
    private setExpanded;
    private activateCell;
    private focusCell;
    onCellClick(event: Event): void;
    /**
     * @remarks APG cell-only expansion: ArrowRight/Left and Enter on the first cell of an
     * expandable row toggle expansion; other cells navigate or activate only.
     */
    onCellKeydown(event: KeyboardEvent): void;
}
export {};