46 lines
1.5 KiB
TypeScript
46 lines
1.5 KiB
TypeScript
import { Injectable } from '@angular/core';
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import { orderBy } from 'lodash';
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import { BehaviorSubject } from 'rxjs';
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import { SortingOption } from './models/sorting-option.model';
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import { SortingOrder, SortingOrders } from './models/sorting-order.type';
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import { KeysOf } from '../utils';
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@Injectable()
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export class SortingService<T> {
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private readonly _sortingOption$ = new BehaviorSubject<SortingOption<T> | undefined>(undefined);
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readonly sortingOption$ = this._sortingOption$.asObservable();
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get sortingOption(): SortingOption<T> | undefined {
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return this._sortingOption$.getValue();
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}
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static sort<T>(values: T[], order?: SortingOrder, column?: KeysOf<T>): T[] {
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if (!values || values.length <= 1 || !order) {
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return values;
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}
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if (!column) {
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/** sort 1D array */
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const result = [...values].sort();
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return order === SortingOrders.asc ? result : result.reverse();
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}
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return orderBy(values, [column], [order]);
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}
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setSortingOption(value: SortingOption<T>): void {
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this._sortingOption$.next(value);
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}
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defaultSort(values: T[]): T[] {
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return SortingService.sort(values, this.sortingOption?.order, this.sortingOption?.column);
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}
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toggleSort(column: KeysOf<T>): void {
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const sameColumn = this.sortingOption?.column === column;
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const order = sameColumn ? SortingOrders.inverseOf(this.sortingOption?.order) : SortingOrders.asc;
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this._sortingOption$.next({ column, order });
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}
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}
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