import { AfterViewInit, ElementRef, EventEmitter, OnChanges, OnDestroy, Renderer2, SimpleChanges } from '@angular/core';
import * as i0 from "@angular/core";
/**
 * A directive that facilitates `file inputs` and `file drop regions`.
 *
 * @export
 */
export declare class UiDragAndDropFileDirective implements OnChanges, AfterViewInit, OnDestroy {
    private _elementRef;
    private _renderer;
    /**
     * The accepted `file-type`.
     *
     */
    fileType?: string;
    /**
     * The element reference that triggers file `browsing`.
     *
     */
    fileBrowseRef?: Element;
    /**
     * The element reference that serve as a `clear` trigger for the selected files.
     *
     */
    fileClearRef?: Element;
    /**
     * Configures if the `file area` accepts multiple files.
     *
     */
    multiple: boolean;
    /**
     * Configures the `disabled` state of the `file area`.
     *
     */
    disabled: boolean;
    /**
     * An event that emits when the file selection state `changes`.
     *
     */
    fileChange: EventEmitter<File[]>;
    /**
     * An event that emits when the file selection is `cleared`.
     *
     */
    fileClear: EventEmitter<any>;
    protected _isDragging: boolean;
    private _disposalCallbacks;
    private _fileInput;
    /**
     * @ignore
     */
    constructor(_elementRef: ElementRef, _renderer: Renderer2);
    /**
     * @ignore
     */
    ngOnChanges(changes: SimpleChanges): void;
    /**
     * @ignore
     */
    ngAfterViewInit(): void;
    /**
     * @ignore
     */
    ngOnDestroy(): void;
    /**
     * Reacts to `drop` events.
     *
     * @param ev The `DragEvent` data associated to the `drop`.
     */
    protected _onDrop(ev: DragEvent): void;
    /**
     * Marks the `state` as `dragging` when a `dragover` event occurs.
     *
     * @param ev The `DragEvent` data associated to the `dragover`.
     */
    protected _onDragOver(ev: DragEvent): void;
    /**
     * Clears the `dragging` `state` when a `dragleave` event occurs.
     *
     * @param ev The `DragEvent` data associated to the `dragover`.
     */
    protected _onDragLeave(ev: DragEvent): void;
    /**
     * Clears the `dragging` `state` when a `dragleave` event occurs.
     *
     * @param ev The `DragEvent` data associated to the `dragend`.
     */
    protected _onDragEnd(): void;
    /**
     * Prevents weird flickering `cross-browser`.
     *
     * @param ev The `DragEvent` data associated to the `dragenter`.
     */
    protected _onDragEnter(ev: DragEvent): void;
    private _emitFiles;
    private _preventEnterOnChildren;
    private _preventAll;
    static ɵfac: i0.ɵɵFactoryDeclaration<UiDragAndDropFileDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<UiDragAndDropFileDirective, "[uiDragAndDropFile]", never, { "fileType": "fileType"; "fileBrowseRef": "fileBrowseRef"; "fileClearRef": "fileClearRef"; "multiple": "multiple"; "disabled": "disabled"; }, { "fileChange": "fileChange"; "fileClear": "fileClear"; }, never, never, false, never>;
}