import { EventEmitter, InjectionToken } from '@angular/core';
import { Observable } from 'rxjs';
import { DragStateTrackerFactory, FileDragState } from './drag-state-tracker.service';
import * as i0 from "@angular/core";
/**
 * A token that can be used to inject a mock into the service
 * @internal
 */
export declare const PAGE_FILE_DRAG_EVENT_TARGET: InjectionToken<unknown>;
/**
 * A helper service that listens for dragenter/dragleave/drop events on the window
 * and tracks when files are dragged into or out of the active tab.
 *
 * When files are accidentally dropped on the tab outside of a drop zone, the drop
 * can be cancelled to prevent the browser from opening/downloading the file.
 * See {@link gtxPreventFileDrop} for details.
 */
export declare class PageFileDragHandler {
    /**
     * Fires when a file is dragged into the current tab, dragged out or dropped.
     * @exmample
     *   class Component {
     *     constructor(private pageDrag: PageFileDragStatusService) { }
     *   }
     *
     *   <ul *ngIf="pageDrag.filesDragged$ | async"> ... </ul>
     */
    filesDragged$: Observable<FileDragState>;
    /**
     * Emits a list when a file is dragged into the current tab.
     * The list contains `{ "type": string }` elements.
     */
    dragEnter: Observable<FileDragState>;
    /**
     * Emits false when a file is dragged out of the current tab.
     */
    dragStop: Observable<boolean>;
    /**
     * Fires when a drop event is prevented.
     */
    dropPrevented: EventEmitter<void>;
    private _filesDragged;
    private _subscription;
    private _eventTarget;
    private _eventsBound;
    private _componentsWantingToPreventFileDrop;
    private _preventAccidentalFileDrop;
    /**
     * Returns true if a file is dragged over the current page/tab.
     * @example
     *   class Component {
     *     constructor(private pageDragStatus: PageFileDragStatusService) {}
     *   }
     *
     *   <ul *ngIf="pageDragStatus.filesDragged"> ... </ul>
     */
    get filesDragged(): FileDragState;
    /**
     * Returns true if files are dragged over the current tab and any file matches the specified mime type.
     * @example
     *   class Component {
     *     constructor(private pageDragStatus: PageFileDragStatusService) {}
     *   }
     *
     *   <ul *ngIf="pageDragStatus.anyDraggedFileIs('image/*')"> ... </ul>
     */
    anyDraggedFileIs(allowedTypes: string): boolean;
    /**
     * Returns true if files are dragged over the current page and all files match the specified mime type.
     * @example
     *   class Component {
     *     constructor(private pageDragStatus: PageFileDragStatusService) {}
     *   }
     *
     *   <ul *ngIf="pageDragStatus.allDraggedFilesAre('image/*')"> ... </ul>
     */
    allDraggedFilesAre(allowedTypes: string): boolean;
    constructor(eventTarget: any, dragState: DragStateTrackerFactory);
    destroy(): void;
    /** @internal */
    bindEvents(): void;
    /** @internal */
    unbindEvents(): void;
    /** @internal */
    preventFileDropOnPageFor(directive: any, prevent: boolean): void;
    private preventAccidentalDrop;
    static ɵfac: i0.ɵɵFactoryDeclaration<PageFileDragHandler, [{ optional: true; }, null]>;
    static ɵprov: i0.ɵɵInjectableDeclaration<PageFileDragHandler>;
}