@dimkel/ng-cdk-table-virtual-scroll
Version:
Virtual scroll for for Angular Cdk Table
80 lines • 11.9 kB
JavaScript
import { BehaviorSubject, ReplaySubject, Subscription } from 'rxjs';
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 DataSource {
constructor(initialData = []) {
super();
this._dataSubject = new BehaviorSubject([]);
this._renderData = new BehaviorSubject([]);
this._renderChangesSubscription = new Subscription();
this.dataToRender$ = new ReplaySubject(1);
this.dataOfRange$ = new ReplaySubject(1);
this._dataSubject.next(initialData);
this._renderChangesSubscription.add(this._dataSubject.subscribe(data => this.dataToRender$.next(data)));
this._renderChangesSubscription.add(this.dataOfRange$.subscribe(data => this._renderData.next(data)));
}
get data() {
return this._dataSubject.value;
}
set data(data) {
this._dataSubject.next(data);
}
connect() {
return this._renderData.asObservable();
}
disconnect() {
this._dataSubject.complete();
this.dataToRender$.complete();
this.dataOfRange$.complete();
this._renderChangesSubscription.unsubscribe();
}
}
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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 DataSource<T> implements TVSDataSource<T> {\n  private readonly _dataSubject = new BehaviorSubject<T[]>([]);\n  private readonly _renderData = new BehaviorSubject<T[]>([]);\n  private readonly _renderChangesSubscription = new Subscription();\n\n  public dataToRender$ = new ReplaySubject<T[]>(1);\n  public dataOfRange$ = new ReplaySubject<T[]>(1);\n\n  get data(): T[] {\n    return this._dataSubject.value;\n  }\n\n  set data(data: T[]) {\n    this._dataSubject.next(data);\n  }\n\n  constructor(initialData: T[] = []) {\n    super();\n    this._dataSubject.next(initialData);\n    this._renderChangesSubscription.add(\n      this._dataSubject.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(): Observable<T[]> {\n    return this._renderData.asObservable();\n  }\n\n  disconnect(): void {\n    this._dataSubject.complete();\n    this.dataToRender$.complete();\n    this.dataOfRange$.complete();\n    this._renderChangesSubscription.unsubscribe();\n  }\n}\n"]}