import { Direction, Directionality } from '@angular/cdk/bidi';
import { ChangeDetectorRef, ElementRef, OnChanges, OnDestroy, OnInit, SimpleChanges } from '@angular/core';
import { BooleanInput, WtSafeAny } from 'ngx-wonton/core/types';
import { WtImageGroupComponent } from './image-group.component';
import { WtImageService } from './image.service';
import * as i0 from "@angular/core";
export declare type ImageStatusType = 'error' | 'loading' | 'normal';
export declare class WtImageDirective implements OnInit, OnChanges, OnDestroy {
    private document;
    private elementRef;
    private wtImageService;
    protected cdr: ChangeDetectorRef;
    private parentGroup;
    private directionality;
    static ngAcceptInputType_nzDisablePreview: BooleanInput;
    wtSrc: string;
    wtSrcset: string;
    wtDisablePreview: boolean;
    wtFallback: string | null;
    wtPlaceholder: string | null;
    dir?: Direction;
    backLoadImage: HTMLImageElement;
    status: ImageStatusType;
    private backLoadDestroy$;
    private destroy$;
    get previewable(): boolean;
    constructor(document: WtSafeAny, elementRef: ElementRef, wtImageService: WtImageService, cdr: ChangeDetectorRef, parentGroup: WtImageGroupComponent, directionality: Directionality);
    ngOnInit(): void;
    ngOnDestroy(): void;
    onPreview(): void;
    getElement(): ElementRef<HTMLImageElement>;
    ngOnChanges(changes: SimpleChanges): void;
    /**
     * use internal Image object handle fallback & placeholder
     *
     * @private
     */
    private backLoad;
    static ɵfac: i0.ɵɵFactoryDeclaration<WtImageDirective, [null, null, null, null, { optional: true; }, { optional: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<WtImageDirective, "img[wt-image]", ["wtImage"], { "wtSrc": "wtSrc"; "wtSrcset": "wtSrcset"; "wtDisablePreview": "wtDisablePreview"; "wtFallback": "wtFallback"; "wtPlaceholder": "wtPlaceholder"; }, {}, never, never, false>;
}