import { BehaviorSubject } from 'rxjs';
import { UiGridColumnDirective } from '../body/ui-grid-column.directive';
import { ISortModel } from '../models';
/**
 * Handles the sort state of every grid column.
 *
 * @export
 * @ignore
 * @internal
 */
export declare class SortManager<T> {
    private _columns;
    sort$: BehaviorSubject<ISortModel<T>>;
    constructor(_columns?: UiGridColumnDirective<T>[]);
    get columns(): UiGridColumnDirective<T>[];
    set columns(columns: UiGridColumnDirective<T>[]);
    /**
     * Sort based on user action on column header
     */
    changeSort(column: UiGridColumnDirective<T>): void;
    clear(): void;
    destroy(): void;
    private _emitSort;
}