import { AfterViewInit, ChangeDetectorRef, OnDestroy } from '@angular/core';
import { ScrollDispatcher } from '@angular/cdk/scrolling';
import { Observable } from 'rxjs';
import { NgxMatSelectSearchParams } from '../../select-model';
import { NgxMatSelectComponent } from '../../select';
import { NgxMatSelectFetchOptionsDirective } from './ngx-mat-select-fetch-options';
import * as i0 from "@angular/core";
export declare class NgxMatSelectFetchOptionsServerSideDirective extends NgxMatSelectFetchOptionsDirective implements AfterViewInit, OnDestroy {
    private scrollDispatcher;
    /**
     * the page size, every calculation for figuring out whether there is a next page or not based on this property
     */
    pageSize: number;
    /**
     * to fetch the options from the server through searchParams
     */
    set fetchOptions(fetchFunction: (searchParams: NgxMatSelectSearchParams) => Observable<unknown[]>);
    /**
     * to store the previous options to use them after coming back to the old pages
     * @private
     */
    protected options: unknown[];
    /**
     *This would store the current page number that we are in it,
     * it stats from one
     * @private
     */
    private pageNumber;
    /**
     * an observable to force the main stream to get the new data filtered through searchTerm
     * @private
     */
    private search$;
    /**
     * an observable to force the main stream to get next page data according to the pageNumber
     * @private
     */
    private fetchNext$;
    /**
     * if it's false when getting the next page request comes the request will be blocked
     * before sending to the server
     * @private
     */
    private hasMore;
    constructor(changeDetectorRef: ChangeDetectorRef, host: NgxMatSelectComponent, scrollDispatcher: ScrollDispatcher);
    /**
     * to search the options with the searchTerm
     * @param searchTerm
     */
    search: (searchTerm: string) => void;
    /**
     * to fetch the next page if any
     */
    fetchNext(): void;
    ngAfterViewInit(): void;
    ngOnDestroy(): void;
    /**
     * to sort the selected items according to the provided sortComparator function
     */
    protected sortValues: () => void;
    /**
     * Actually in the server-side mode we would not be able to sync options with values
     * in order to omit non-exist values through the received options,
     * because we don't have all options available at once, so we don't have
     * any indicator to distinguish between them, so whatever value is provided would be set as the selected option
     */
    protected syncValueAndOptions: () => void;
    /**
     * to listen to the virtual scroll events, and get the next page at the appropriate time.
     * @private
     */
    private initializeInfiniteScroll;
    static ɵfac: i0.ɵɵFactoryDeclaration<NgxMatSelectFetchOptionsServerSideDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<NgxMatSelectFetchOptionsServerSideDirective, "ngx-mat-select[serverSide]:not(ngx-mat-select[clientSide])", ["ngxMatSelectServerSide"], { "pageSize": { "alias": "pageSize"; "required": false; }; "fetchOptions": { "alias": "fetchOptions"; "required": false; }; }, {}, never, never, false, never>;
}