ngxsmk-datatable/lib/services/virtual-scroll.service.d.ts

A powerful, feature-rich Angular datatable component with virtual scrolling, built for Angular 17+

import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export interface VirtualScrollState {
    startIndex: number;
    endIndex: number;
    visibleItems: any[];
    totalHeight: number;
    scrollTop: number;
}
export interface HorizontalVirtualScrollState {
    startColumnIndex: number;
    endColumnIndex: number;
    visibleColumns: any[];
    totalWidth: number;
    scrollLeft: number;
    leftOffset: number;
}
export declare class VirtualScrollService {
    private stateSubject;
    state$: Observable<VirtualScrollState>;
    calculateVisibleItems(items: any[], containerHeight: number, itemHeight: number, scrollTop: number, bufferSize?: number): VirtualScrollState;
    scrollToItem(itemIndex: number, itemHeight: number, containerHeight: number): number;
    getItemOffset(itemIndex: number, itemHeight: number): number;
    isItemVisible(itemIndex: number, startIndex: number, endIndex: number): boolean;
    getVisibleRange(scrollTop: number, containerHeight: number, itemHeight: number, totalItems: number, bufferSize?: number): {
        start: number;
        end: number;
    };
    calculateScrollPosition(targetIndex: number, itemHeight: number, containerHeight: number): number;
    getSpacerHeight(startIndex: number, endIndex: number, itemHeight: number, totalItems: number): {
        top: number;
        bottom: number;
    };
    /**
     * Calculate visible columns based on horizontal scroll position
     */
    calculateVisibleColumns(columns: any[], columnWidths: {
        [key: string]: number;
    }, containerWidth: number, scrollLeft: number, bufferSize?: number): HorizontalVirtualScrollState;
    /**
     * Scroll to a specific column
     */
    scrollToColumn(columnIndex: number, columnWidths: {
        [key: string]: number;
    }, columns: any[], containerWidth: number): number;
    /**
     * Get spacer widths for horizontal virtual scrolling
     */
    getHorizontalSpacerWidth(startColumnIndex: number, endColumnIndex: number, columnWidths: {
        [key: string]: number;
    }, columns: any[]): {
        left: number;
        right: number;
    };
    /**
     * Check if a column is currently visible in the viewport
     */
    isColumnVisible(columnIndex: number, startColumnIndex: number, endColumnIndex: number): boolean;
    /**
     * Get total width of all columns
     */
    getTotalColumnsWidth(columns: any[], columnWidths: {
        [key: string]: number;
    }): number;
    static ɵfac: i0.ɵɵFactoryDeclaration<VirtualScrollService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<VirtualScrollService>;
}