2020-10-01 15:21:22 +00:00
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import { DataSource } from '@angular/cdk/collections';
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2020-11-23 04:55:53 +00:00
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import { EventEmitter } from '@angular/core';
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import { MatPaginator, PageEvent } from '@angular/material/paginator';
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import { MatSort, Sort } from '@angular/material/sort';
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2020-10-01 15:21:22 +00:00
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import { merge, Observable, of as observableOf } from 'rxjs';
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2020-10-10 03:15:05 +00:00
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import { map } from 'rxjs/operators';
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2020-11-24 02:33:43 +00:00
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import { BalanceSheetItem } from './balance-sheet-item';
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2020-10-10 03:15:05 +00:00
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/** Simple sort comparator for example ID/Name columns (for client-side sorting). */
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2020-12-08 06:39:19 +00:00
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const compare = (a: string | number, b: string | number, isAsc: boolean) => (a < b ? -1 : 1) * (isAsc ? 1 : -1);
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2020-11-24 02:33:43 +00:00
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export class BalanceSheetDataSource extends DataSource<BalanceSheetItem> {
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constructor(
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public data: BalanceSheetItem[],
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private paginator?: MatPaginator,
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private sort?: MatSort,
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) {
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2018-05-25 13:49:00 +00:00
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super();
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}
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2020-11-24 02:33:43 +00:00
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connect(): Observable<BalanceSheetItem[]> {
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const dataMutations: (
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| Observable<BalanceSheetItem[]>
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| EventEmitter<PageEvent>
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| EventEmitter<Sort>
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)[] = [observableOf(this.data)];
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2020-12-08 06:39:19 +00:00
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if (this.paginator) {
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dataMutations.push((this.paginator as MatPaginator).page);
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}
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if (this.sort) {
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dataMutations.push((this.sort as MatSort).sortChange);
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}
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2018-05-25 13:49:00 +00:00
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// Set the paginators length
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2020-12-08 06:39:19 +00:00
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if (this.paginator) {
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this.paginator.length = this.data.length;
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}
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2018-05-25 13:49:00 +00:00
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2020-10-01 15:21:22 +00:00
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return merge(...dataMutations).pipe(
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2020-10-10 03:15:05 +00:00
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map(() => this.getPagedData(this.getSortedData([...this.data]))),
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2020-10-01 15:21:22 +00:00
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);
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2018-05-25 13:49:00 +00:00
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}
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2020-10-01 15:21:22 +00:00
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disconnect() {}
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2018-05-25 13:49:00 +00:00
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2020-11-24 02:33:43 +00:00
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private getPagedData(data: BalanceSheetItem[]) {
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2020-12-08 06:39:19 +00:00
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if (this.paginator === undefined) {
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return data;
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}
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2018-05-25 13:49:00 +00:00
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const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
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return data.splice(startIndex, this.paginator.pageSize);
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}
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2020-11-24 02:33:43 +00:00
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private getSortedData(data: BalanceSheetItem[]) {
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2020-12-08 06:39:19 +00:00
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if (this.sort === undefined) {
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return data;
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}
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2018-05-25 13:49:00 +00:00
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if (!this.sort.active || this.sort.direction === '') {
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return data;
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}
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2020-11-23 04:55:53 +00:00
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const sort = this.sort as MatSort;
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2018-05-25 13:49:00 +00:00
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return data.sort((a, b) => {
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2020-11-23 04:55:53 +00:00
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const isAsc = sort.direction === 'asc';
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switch (sort.active) {
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2018-05-25 13:49:00 +00:00
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case 'name':
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2020-12-08 06:39:19 +00:00
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if (a.name === undefined || b.name === undefined) {
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return 0;
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}
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2018-05-25 13:49:00 +00:00
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return compare(a.name, b.name, isAsc);
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default:
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return 0;
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}
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});
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}
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}
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