import { ChangeDetectorRef, ElementRef, EventEmitter, OnChanges, OnDestroy, QueryList, SimpleChanges, TemplateRef } from '@angular/core';
import { Orientation, ThumbTemplateContext } from '../../core';
import { Aria } from '../../core/aria';
import { GalleryItemEvent, GalleryItemInternal } from '../../core/gallery-item';
export declare class ThumbsComponent implements OnChanges, OnDestroy {
    private cd;
    private elRef;
    items: GalleryItemInternal[];
    selectedIndex: number;
    aria: Aria;
    orientation: Orientation;
    arrows: boolean;
    arrowSlideByLength: number;
    autoScroll: boolean;
    thumbTemplate: TemplateRef<ThumbTemplateContext>;
    arrowTemplate: TemplateRef<void>;
    errorTemplate: TemplateRef<void>;
    scrollBehavior: ScrollBehavior;
    isRtl: boolean;
    thumbClick: EventEmitter<GalleryItemEvent>;
    thumbHover: EventEmitter<GalleryItemEvent>;
    thumbListRef: ElementRef<HTMLElement>;
    thumbsRef: QueryList<ElementRef<HTMLElement>>;
    isVideo: (item: import("../../core").GalleryItem) => boolean;
    showStartArrow: boolean;
    showEndArrow: boolean;
    private arrowObserver;
    private scrollId;
    readonly cssClass: string;
    private readonly hostOffsetAxis;
    private readonly scrollKey;
    private readonly thumbsEmpty;
    private readonly vertical;
    constructor(cd: ChangeDetectorRef, elRef: ElementRef<HTMLElement>);
    ngOnChanges({ arrows, items }: SimpleChanges): void;
    ngOnDestroy(): void;
    slide(direction: number): void;
    centerThumbIfNeeded(index: number): void;
    select(index: number): void;
    emitEvent(index: number, item: GalleryItemInternal, event: Event, emitter: EventEmitter<GalleryItemEvent>): void;
    onLoadChange(item: GalleryItemInternal, success: boolean): void;
    private scroll;
    private shiftByDelta;
    private onArrowsObserved;
    private observeArrows;
    private setObservedArrows;
    private unobserveArrows;
}