import { AfterViewInit, ElementRef, EventEmitter, OnDestroy, OnInit } from '@angular/core';
import { FileReaderError, FileReaderService } from './file-reader.service';
import * as i0 from "@angular/core";
/**
 * A directive that turns any html element into a file drop zone
 * - does not use a dynamically created input element and only reacts on file drag and drop
 * - adds a css class to the host element when files are being dragged over
 *
 * @export
 */
export declare class UiFileDropZoneDirective implements OnInit, AfterViewInit, OnDestroy {
    private readonly _element;
    protected readonly _fileReaderService: FileReaderService;
    disabled?: boolean;
    sortBy?: string;
    set accept(value: string | undefined);
    filesReceived: EventEmitter<File[]>;
    filesLoading: EventEmitter<boolean>;
    fileError: EventEmitter<FileReaderError | null>;
    private _accept;
    private _dragCount;
    private _dropZone?;
    private _destroyed$;
    constructor(_element: ElementRef, _fileReaderService: FileReaderService);
    drop(e: DragEvent): void;
    dragover(e: DragEvent): void;
    dragenter(): void;
    dragleave(): void;
    ngOnInit(): void;
    ngAfterViewInit(): void;
    ngOnDestroy(): void;
    protected _emitFiles(files: File[]): void;
    private _highlightDropZone;
    private _clearDropZoneHighlight;
    private _dragEventContainsFiles;
    static ɵfac: i0.ɵɵFactoryDeclaration<UiFileDropZoneDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<UiFileDropZoneDirective, "[uiFileDropZone]", never, { "disabled": "disabled"; "sortBy": "sortBy"; "accept": "accept"; }, { "filesReceived": "filesReceived"; "filesLoading": "filesLoading"; "fileError": "fileError"; }, never, never, true, never>;
}