import { DoCheck, OnDestroy, OnInit, TrackByFunction } from '@angular/core';
import * as i0 from "@angular/core";
/**
 * This implementation is inspired by the CDK virtual for:
 * https://github.com/angular/material2/blob/master/src/cdk/scrolling/virtual-for-of.ts
 * However the CDK requires a container component which limits use in places such
 * as fixed header tables, so this is a more generic implementation that does not
 * require a parent element but instead uses an attribute on the parent container instead
 */
export declare class VirtualForDirective<T> implements OnInit, DoCheck, OnDestroy {
    /** A reference to the container element where we will insert elements. */
    private readonly _viewContainerRef;
    /** The template for all items */
    private readonly _templateRef;
    /** Gets the set of Angular differs for detecting changes. */
    private readonly _differs;
    /** Get the renderer to perform DOM manipulation */
    private readonly _renderer;
    private readonly _changeDetector;
    /** A service to share values between the container and child elements */
    private readonly _virtualScroll;
    /** Store the list of items to display */
    set uxVirtualForOf(dataset: T[]);
    /** Provide a trackBy function to optimize rendering */
    uxVirtualForTrackBy: TrackByFunction<T> | undefined;
    /** The instance of the differ we create */
    private _differ;
    /** Keep a local reference to the dataset */
    private _dataset;
    /** Store the currently rendered range */
    private _renderedRange;
    /** Store a list of all the currently rendered items */
    private _renderedItems;
    /** Indicate whether we need to perform a view update */
    private _isDirty;
    /** Store a cache of recently disposed views for reuse */
    private readonly _templateCache;
    /** Limit the size of the cache as it can use a lot of memory */
    private readonly _cacheSize;
    /** Unsubscribe from all observables */
    private readonly _onDestroy;
    constructor();
    ngOnInit(): void;
    ngDoCheck(): void;
    ngOnDestroy(): void;
    /** If an itemSize is not specified we need to calculate it */
    getHeight(context: T, length: number): number;
    /** Determine if the range has changed (performance optimization) */
    private isRangeSame;
    private onRangeChange;
    /** Determine which items have changed */
    private getChanges;
    /** Insert, move and remove any items within the view */
    private applyChanges;
    updateContexts(): void;
    private createView;
    private defaultTrackBy;
    static ɵfac: i0.ɵɵFactoryDeclaration<VirtualForDirective<any>, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<VirtualForDirective<any>, "[uxVirtualFor][uxVirtualForOf]", never, { "uxVirtualForOf": { "alias": "uxVirtualForOf"; "required": false; }; "uxVirtualForTrackBy": { "alias": "uxVirtualForTrackBy"; "required": false; }; }, {}, never, never, false, never>;
}
/** We want to supply the same properties as `ngFor` */
export interface VirtualForOfContext<T> {
    $implicit: T;
    index: number;
    count: number;
    first: boolean;
    last: boolean;
    even: boolean;
    odd: boolean;
}