ng-table-virtual-scroll
Version:
Virtual scroll for for Angular Material Table
88 lines • 15.1 kB
JavaScript
import { BehaviorSubject, combineLatest, merge, of, ReplaySubject, Subscription } from 'rxjs';
import { map } from 'rxjs/operators';
import { MatTableDataSource } from '@angular/material/table';
import { DataSource } from '@angular/cdk/collections';
export function isTVSDataSource(dataSource) {
return dataSource instanceof CdkTableVirtualScrollDataSource || dataSource instanceof TableVirtualScrollDataSource;
}
export class CdkTableVirtualScrollDataSource extends DataSource {
constructor(initialData = []) {
super();
/** Stream emitting render data to the table (depends on ordered data changes). */
this._renderData = new BehaviorSubject([]);
/**
* Subscription to the changes that should trigger an update to the table's rendered rows, such
* as filtering, sorting, pagination, or base data changes.
*/
this._renderChangesSubscription = null;
this._data = new BehaviorSubject(initialData);
this._updateChangeSubscription();
}
/** Array of data that should be rendered by the table, where each object represents one row. */
get data() {
return this._data.value;
}
set data(data) {
data = Array.isArray(data) ? data : [];
this._data.next(data);
}
_updateChangeSubscription() {
this.initStreams();
this._renderChangesSubscription?.unsubscribe();
this._renderChangesSubscription = new Subscription();
this._renderChangesSubscription.add(this._data.subscribe(data => this.dataToRender$.next(data)));
this._renderChangesSubscription.add(this.dataOfRange$.subscribe(data => this._renderData.next(data)));
}
connect() {
if (!this._renderChangesSubscription) {
this._updateChangeSubscription();
}
return this._renderData;
}
disconnect() {
this._renderChangesSubscription?.unsubscribe();
this._renderChangesSubscription = null;
}
initStreams() {
if (!this.streamsReady) {
this.dataToRender$ = new ReplaySubject(1);
this.dataOfRange$ = new ReplaySubject(1);
this.streamsReady = true;
}
}
}
export class TableVirtualScrollDataSource extends MatTableDataSource {
_updateChangeSubscription() {
this.initStreams();
const _sort = this['_sort'];
const _paginator = this['_paginator'];
const _internalPageChanges = this['_internalPageChanges'];
const _filter = this['_filter'];
const _renderData = this['_renderData'];
const sortChange = _sort ?
merge(_sort.sortChange, _sort.initialized) :
of(null);
const pageChange = _paginator ?
merge(_paginator.page, _internalPageChanges, _paginator.initialized) :
of(null);
const dataStream = this['_data'];
const filteredData = combineLatest([dataStream, _filter])
.pipe(map(([data]) => this._filterData(data)));
const orderedData = combineLatest([filteredData, sortChange])
.pipe(map(([data]) => this._orderData(data)));
const paginatedData = combineLatest([orderedData, pageChange])
.pipe(map(([data]) => this._pageData(data)));
this._renderChangesSubscription?.unsubscribe();
this._renderChangesSubscription = new Subscription();
this._renderChangesSubscription.add(paginatedData.subscribe(data => this.dataToRender$.next(data)));
this._renderChangesSubscription.add(this.dataOfRange$.subscribe(data => _renderData.next(data)));
}
initStreams() {
if (!this.streamsReady) {
this.dataToRender$ = new ReplaySubject(1);
this.dataOfRange$ = new ReplaySubject(1);
this.streamsReady = true;
}
}
}
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{ BehaviorSubject, combineLatest, merge, Observable, of, ReplaySubject, Subject, Subscription } from 'rxjs';\nimport { map } from 'rxjs/operators';\nimport { MatTableDataSource } from '@angular/material/table';\nimport { MatSort, Sort } from '@angular/material/sort';\nimport { MatPaginator, PageEvent } from '@angular/material/paginator';\nimport { DataSource } from '@angular/cdk/collections';\n\nexport interface TVSDataSource<T> {\n  dataToRender$: Subject<T[]>;\n  dataOfRange$: Subject<T[]>;\n}\n\nexport function isTVSDataSource<T>(dataSource: unknown): dataSource is TVSDataSource<T> {\n  return dataSource instanceof CdkTableVirtualScrollDataSource || dataSource instanceof TableVirtualScrollDataSource;\n}\n\nexport class CdkTableVirtualScrollDataSource<T> extends DataSource<T> implements TVSDataSource<T> {\n  /** Stream that emits when a new data array is set on the data source. */\n  private readonly _data: BehaviorSubject<T[]>;\n\n  /** Stream emitting render data to the table (depends on ordered data changes). */\n  private readonly _renderData = new BehaviorSubject<T[]>([]);\n\n  /**\n   * Subscription to the changes that should trigger an update to the table's rendered rows, such\n   * as filtering, sorting, pagination, or base data changes.\n   */\n  _renderChangesSubscription: Subscription | null = null;\n\n  /** Array of data that should be rendered by the table, where each object represents one row. */\n  get data() {\n    return this._data.value;\n  }\n\n  set data(data: T[]) {\n    data = Array.isArray(data) ? data : [];\n    this._data.next(data);\n  }\n\n  public dataToRender$: Subject<T[]>;\n  public dataOfRange$: Subject<T[]>;\n  private streamsReady: boolean;\n\n\n  constructor(initialData: T[] = []) {\n    super();\n    this._data = new BehaviorSubject<T[]>(initialData);\n    this._updateChangeSubscription();\n  }\n\n  _updateChangeSubscription() {\n    this.initStreams();\n\n    this._renderChangesSubscription?.unsubscribe();\n    this._renderChangesSubscription = new Subscription();\n    this._renderChangesSubscription.add(\n      this._data.subscribe(data => this.dataToRender$.next(data))\n    );\n    this._renderChangesSubscription.add(\n      this.dataOfRange$.subscribe(data => this._renderData.next(data))\n    );\n  }\n\n  connect() {\n    if (!this._renderChangesSubscription) {\n      this._updateChangeSubscription();\n    }\n\n    return this._renderData;\n  }\n\n\n  disconnect() {\n    this._renderChangesSubscription?.unsubscribe();\n    this._renderChangesSubscription = null;\n  }\n\n  private initStreams() {\n    if (!this.streamsReady) {\n      this.dataToRender$ = new ReplaySubject<T[]>(1);\n      this.dataOfRange$ = new ReplaySubject<T[]>(1);\n      this.streamsReady = true;\n    }\n  }\n}\n\nexport class TableVirtualScrollDataSource<T> extends MatTableDataSource<T> implements TVSDataSource<T> {\n  public dataToRender$: Subject<T[]>;\n  public dataOfRange$: Subject<T[]>;\n  private streamsReady: boolean;\n\n  _updateChangeSubscription() {\n    this.initStreams();\n    const _sort: MatSort | null = this['_sort'];\n    const _paginator: MatPaginator | null = this['_paginator'];\n    const _internalPageChanges: Subject<void> = this['_internalPageChanges'];\n    const _filter: BehaviorSubject<string> = this['_filter'];\n    const _renderData: BehaviorSubject<T[]> = this['_renderData'];\n\n    const sortChange: Observable<Sort | null | void> = _sort ?\n      merge(_sort.sortChange, _sort.initialized) as Observable<Sort | void> :\n      of(null);\n    const pageChange: Observable<PageEvent | null | void> = _paginator ?\n      merge(\n        _paginator.page,\n        _internalPageChanges,\n        _paginator.initialized\n      ) as Observable<PageEvent | void> :\n      of(null);\n    const dataStream: Observable<T[]> = this['_data'];\n    const filteredData = combineLatest([dataStream, _filter])\n      .pipe(map(([data]) => this._filterData(data)));\n    const orderedData = combineLatest([filteredData, sortChange])\n      .pipe(map(([data]) => this._orderData(data)));\n    const paginatedData = combineLatest([orderedData, pageChange])\n      .pipe(map(([data]) => this._pageData(data)));\n\n    this._renderChangesSubscription?.unsubscribe();\n    this._renderChangesSubscription = new Subscription();\n    this._renderChangesSubscription.add(\n      paginatedData.subscribe(data => this.dataToRender$.next(data))\n    );\n    this._renderChangesSubscription.add(\n      this.dataOfRange$.subscribe(data => _renderData.next(data))\n    );\n  }\n\n  private initStreams() {\n    if (!this.streamsReady) {\n      this.dataToRender$ = new ReplaySubject<T[]>(1);\n      this.dataOfRange$ = new ReplaySubject<T[]>(1);\n      this.streamsReady = true;\n    }\n  }\n}\n"]}