import { CdkVirtualScrollViewport, VirtualScrollStrategy } from '@angular/cdk/scrolling';
import * as i0 from "@angular/core";
export declare const YEARS_TO_BE_RENDERED = 200;
export declare const START_CYCLE_YEAR = 1900;
export interface FsCalendarMobileScrollStrategy extends VirtualScrollStrategy {
    setInitialDate(date: Date): void;
    scrollToDate(date: Date, behavior?: ScrollBehavior): void;
}
/**
 * Implementation has been taken from Alex Inkin article, adopted and modified a bit
 * https://indepth.dev/posts/1091/writing-custom-virtual-scroll-strategy
 */
export declare class CalendarScrollStrategy implements FsCalendarMobileScrollStrategy {
    private readonly _index$;
    readonly scrolledIndexChange: import("rxjs").Observable<number>;
    private _viewport;
    private _initialDate;
    private _firstTimeRender;
    private readonly yearsCycle;
    private readonly yearsCycleHeight;
    attach(viewport: CdkVirtualScrollViewport): void;
    detach(): void;
    onContentScrolled(): void;
    onDataLengthChanged(): void;
    onContentRendered(): void;
    onRenderedOffsetChanged(): void;
    /**
     * Initial Date for render can be set on initialization step to reduce calculations
     */
    setInitialDate(date: Date): void;
    /**
     * Does scroll to month with provided index
     */
    scrollToIndex(index: number, behavior: ScrollBehavior): void;
    /**
     * Does the same thing as scrollToIndex(), but for date
     */
    scrollToDate(date: Date, behavior?: ScrollBehavior): void;
    /**
     * Update the viewport's rendered range.
     */
    private _updateRenderedRange;
    private _getOffsetForIndex;
    private _getIndexForOffset;
    private _getOffsetForDate;
    private _computeHeight;
    static ɵfac: i0.ɵɵFactoryDeclaration<CalendarScrollStrategy, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<CalendarScrollStrategy>;
}