/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { __read, __values } from "tslib"; import { ArrayDataSource, isDataSource, } from '@angular/cdk/collections'; import { Directive, Input, IterableDiffers, NgZone, SkipSelf, TemplateRef, ViewContainerRef, } from '@angular/core'; import { Subject, of as observableOf, isObservable } from 'rxjs'; import { pairwise, shareReplay, startWith, switchMap, takeUntil } from 'rxjs/operators'; import { CdkVirtualScrollViewport } from './virtual-scroll-viewport'; /** Helper to extract size from a DOM Node. */ function getSize(orientation, node) { var el = node; if (!el.getBoundingClientRect) { return 0; } var rect = el.getBoundingClientRect(); return orientation == 'horizontal' ? rect.width : rect.height; } /** * A directive similar to `ngForOf` to be used for rendering data inside a virtual scrolling * container. */ var CdkVirtualForOf = /** @class */ (function () { function CdkVirtualForOf( /** The view container to add items to. */ _viewContainerRef, /** The template to use when stamping out new items. */ _template, /** The set of available differs. */ _differs, /** The virtual scrolling viewport that these items are being rendered in. */ _viewport, ngZone) { var _this = this; this._viewContainerRef = _viewContainerRef; this._template = _template; this._differs = _differs; this._viewport = _viewport; /** Emits when the rendered view of the data changes. */ this.viewChange = new Subject(); /** Subject that emits when a new DataSource instance is given. */ this._dataSourceChanges = new Subject(); /** * The size of the cache used to store templates that are not being used for re-use later. * Setting the cache size to `0` will disable caching. Defaults to 20 templates. */ this.cdkVirtualForTemplateCacheSize = 20; /** Emits whenever the data in the current DataSource changes. */ this.dataStream = this._dataSourceChanges .pipe( // Start off with null `DataSource`. startWith(null), // Bundle up the previous and current data sources so we can work with both. pairwise(), // Use `_changeDataSource` to disconnect from the previous data source and connect to the // new one, passing back a stream of data changes which we run through `switchMap` to give // us a data stream that emits the latest data from whatever the current `DataSource` is. switchMap(function (_a) { var _b = __read(_a, 2), prev = _b[0], cur = _b[1]; return _this._changeDataSource(prev, cur); }), // Replay the last emitted data when someone subscribes. shareReplay(1)); /** The differ used to calculate changes to the data. */ this._differ = null; /** * The template cache used to hold on ot template instancess that have been stamped out, but don't * currently need to be rendered. These instances will be reused in the future rather than * stamping out brand new ones. */ this._templateCache = []; /** Whether the rendered data should be updated during the next ngDoCheck cycle. */ this._needsUpdate = false; this._destroyed = new Subject(); this.dataStream.subscribe(function (data) { _this._data = data; _this._onRenderedDataChange(); }); this._viewport.renderedRangeStream.pipe(takeUntil(this._destroyed)).subscribe(function (range) { _this._renderedRange = range; ngZone.run(function () { return _this.viewChange.next(_this._renderedRange); }); _this._onRenderedDataChange(); }); this._viewport.attach(this); } Object.defineProperty(CdkVirtualForOf.prototype, "cdkVirtualForOf", { /** The DataSource to display. */ get: function () { return this._cdkVirtualForOf; }, set: function (value) { this._cdkVirtualForOf = value; if (isDataSource(value)) { this._dataSourceChanges.next(value); } else { // Slice the value if its an NgIterable to ensure we're working with an array. this._dataSourceChanges.next(new ArrayDataSource(isObservable(value) ? value : Array.prototype.slice.call(value || []))); } }, enumerable: true, configurable: true }); Object.defineProperty(CdkVirtualForOf.prototype, "cdkVirtualForTrackBy", { /** * The `TrackByFunction` to use for tracking changes. The `TrackByFunction` takes the index and * the item and produces a value to be used as the item's identity when tracking changes. */ get: function () { return this._cdkVirtualForTrackBy; }, set: function (fn) { var _this = this; this._needsUpdate = true; this._cdkVirtualForTrackBy = fn ? function (index, item) { return fn(index + (_this._renderedRange ? _this._renderedRange.start : 0), item); } : undefined; }, enumerable: true, configurable: true }); Object.defineProperty(CdkVirtualForOf.prototype, "cdkVirtualForTemplate", { /** The template used to stamp out new elements. */ set: function (value) { if (value) { this._needsUpdate = true; this._template = value; } }, enumerable: true, configurable: true }); /** * Measures the combined size (width for horizontal orientation, height for vertical) of all items * in the specified range. Throws an error if the range includes items that are not currently * rendered. */ CdkVirtualForOf.prototype.measureRangeSize = function (range, orientation) { if (range.start >= range.end) { return 0; } if (range.start < this._renderedRange.start || range.end > this._renderedRange.end) { throw Error("Error: attempted to measure an item that isn't rendered."); } // The index into the list of rendered views for the first item in the range. var renderedStartIndex = range.start - this._renderedRange.start; // The length of the range we're measuring. var rangeLen = range.end - range.start; // Loop over all root nodes for all items in the range and sum up their size. var totalSize = 0; var i = rangeLen; while (i--) { var view = this._viewContainerRef.get(i + renderedStartIndex); var j = view ? view.rootNodes.length : 0; while (j--) { totalSize += getSize(orientation, view.rootNodes[j]); } } return totalSize; }; CdkVirtualForOf.prototype.ngDoCheck = function () { if (this._differ && this._needsUpdate) { // TODO(mmalerba): We should differentiate needs update due to scrolling and a new portion of // this list being rendered (can use simpler algorithm) vs needs update due to data actually // changing (need to do this diff). var changes = this._differ.diff(this._renderedItems); if (!changes) { this._updateContext(); } else { this._applyChanges(changes); } this._needsUpdate = false; } }; CdkVirtualForOf.prototype.ngOnDestroy = function () { var e_1, _a; this._viewport.detach(); this._dataSourceChanges.next(); this._dataSourceChanges.complete(); this.viewChange.complete(); this._destroyed.next(); this._destroyed.complete(); try { for (var _b = __values(this._templateCache), _c = _b.next(); !_c.done; _c = _b.next()) { var view = _c.value; view.destroy(); } } catch (e_1_1) { e_1 = { error: e_1_1 }; } finally { try { if (_c && !_c.done && (_a = _b.return)) _a.call(_b); } finally { if (e_1) throw e_1.error; } } }; /** React to scroll state changes in the viewport. */ CdkVirtualForOf.prototype._onRenderedDataChange = function () { if (!this._renderedRange) { return; } this._renderedItems = this._data.slice(this._renderedRange.start, this._renderedRange.end); if (!this._differ) { this._differ = this._differs.find(this._renderedItems).create(this.cdkVirtualForTrackBy); } this._needsUpdate = true; }; /** Swap out one `DataSource` for another. */ CdkVirtualForOf.prototype._changeDataSource = function (oldDs, newDs) { if (oldDs) { oldDs.disconnect(this); } this._needsUpdate = true; return newDs ? newDs.connect(this) : observableOf(); }; /** Update the `CdkVirtualForOfContext` for all views. */ CdkVirtualForOf.prototype._updateContext = function () { var count = this._data.length; var i = this._viewContainerRef.length; while (i--) { var view = this._viewContainerRef.get(i); view.context.index = this._renderedRange.start + i; view.context.count = count; this._updateComputedContextProperties(view.context); view.detectChanges(); } }; /** Apply changes to the DOM. */ CdkVirtualForOf.prototype._applyChanges = function (changes) { var _this = this; // Rearrange the views to put them in the right location. changes.forEachOperation(function (record, adjustedPreviousIndex, currentIndex) { if (record.previousIndex == null) { // Item added. var view = _this._insertViewForNewItem(currentIndex); view.context.$implicit = record.item; } else if (currentIndex == null) { // Item removed. _this._cacheView(_this._detachView(adjustedPreviousIndex)); } else { // Item moved. var view = _this._viewContainerRef.get(adjustedPreviousIndex); _this._viewContainerRef.move(view, currentIndex); view.context.$implicit = record.item; } }); // Update $implicit for any items that had an identity change. changes.forEachIdentityChange(function (record) { var view = _this._viewContainerRef.get(record.currentIndex); view.context.$implicit = record.item; }); // Update the context variables on all items. var count = this._data.length; var i = this._viewContainerRef.length; while (i--) { var view = this._viewContainerRef.get(i); view.context.index = this._renderedRange.start + i; view.context.count = count; this._updateComputedContextProperties(view.context); } }; /** Cache the given detached view. */ CdkVirtualForOf.prototype._cacheView = function (view) { if (this._templateCache.length < this.cdkVirtualForTemplateCacheSize) { this._templateCache.push(view); } else { var index = this._viewContainerRef.indexOf(view); // It's very unlikely that the index will ever be -1, but just in case, // destroy the view on its own, otherwise destroy it through the // container to ensure that all the references are removed. if (index === -1) { view.destroy(); } else { this._viewContainerRef.remove(index); } } }; /** Inserts a view for a new item, either from the cache or by creating a new one. */ CdkVirtualForOf.prototype._insertViewForNewItem = function (index) { return this._insertViewFromCache(index) || this._createEmbeddedViewAt(index); }; /** Update the computed properties on the `CdkVirtualForOfContext`. */ CdkVirtualForOf.prototype._updateComputedContextProperties = function (context) { context.first = context.index === 0; context.last = context.index === context.count - 1; context.even = context.index % 2 === 0; context.odd = !context.even; }; /** Creates a new embedded view and moves it to the given index */ CdkVirtualForOf.prototype._createEmbeddedViewAt = function (index) { // Note that it's important that we insert the item directly at the proper index, // rather than inserting it and the moving it in place, because if there's a directive // on the same node that injects the `ViewContainerRef`, Angular will insert another // comment node which can throw off the move when it's being repeated for all items. return this._viewContainerRef.createEmbeddedView(this._template, { $implicit: null, // It's guaranteed that the iterable is not "undefined" or "null" because we only // generate views for elements if the "cdkVirtualForOf" iterable has elements. cdkVirtualForOf: this._cdkVirtualForOf, index: -1, count: -1, first: false, last: false, odd: false, even: false }, index); }; /** Inserts a recycled view from the cache at the given index. */ CdkVirtualForOf.prototype._insertViewFromCache = function (index) { var cachedView = this._templateCache.pop(); if (cachedView) { this._viewContainerRef.insert(cachedView, index); } return cachedView || null; }; /** Detaches the embedded view at the given index. */ CdkVirtualForOf.prototype._detachView = function (index) { return this._viewContainerRef.detach(index); }; CdkVirtualForOf.decorators = [ { type: Directive, args: [{ selector: '[cdkVirtualFor][cdkVirtualForOf]', },] } ]; /** @nocollapse */ CdkVirtualForOf.ctorParameters = function () { return [ { type: ViewContainerRef }, { type: TemplateRef }, { type: IterableDiffers }, { type: CdkVirtualScrollViewport, decorators: [{ type: SkipSelf }] }, { type: NgZone } ]; }; CdkVirtualForOf.propDecorators = { cdkVirtualForOf: [{ type: Input }], cdkVirtualForTrackBy: [{ type: Input }], cdkVirtualForTemplate: [{ type: Input }], cdkVirtualForTemplateCacheSize: [{ type: Input }] }; return CdkVirtualForOf; }()); export { CdkVirtualForOf }; //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  ArrayDataSource,\n  CollectionViewer,\n  DataSource,\n  ListRange,\n  isDataSource,\n} from '@angular/cdk/collections';\nimport {\n  Directive,\n  DoCheck,\n  EmbeddedViewRef,\n  Input,\n  IterableChangeRecord,\n  IterableChanges,\n  IterableDiffer,\n  IterableDiffers,\n  NgIterable,\n  NgZone,\n  OnDestroy,\n  SkipSelf,\n  TemplateRef,\n  TrackByFunction,\n  ViewContainerRef,\n} from '@angular/core';\nimport {Observable, Subject, of as observableOf, isObservable} from 'rxjs';\nimport {pairwise, shareReplay, startWith, switchMap, takeUntil} from 'rxjs/operators';\nimport {CdkVirtualScrollViewport} from './virtual-scroll-viewport';\n\n\n/** The context for an item rendered by `CdkVirtualForOf` */\nexport type CdkVirtualForOfContext<T> = {\n  /** The item value. */\n  $implicit: T;\n  /** The DataSource, Observable, or NgIterable that was passed to *cdkVirtualFor. */\n  cdkVirtualForOf: DataSource<T> | Observable<T[]> | NgIterable<T>;\n  /** The index of the item in the DataSource. */\n  index: number;\n  /** The number of items in the DataSource. */\n  count: number;\n  /** Whether this is the first item in the DataSource. */\n  first: boolean;\n  /** Whether this is the last item in the DataSource. */\n  last: boolean;\n  /** Whether the index is even. */\n  even: boolean;\n  /** Whether the index is odd. */\n  odd: boolean;\n};\n\n\n/** Helper to extract size from a DOM Node. */\nfunction getSize(orientation: 'horizontal' | 'vertical', node: Node): number {\n  const el = node as Element;\n  if (!el.getBoundingClientRect) {\n    return 0;\n  }\n  const rect = el.getBoundingClientRect();\n  return orientation == 'horizontal' ? rect.width : rect.height;\n}\n\n\n/**\n * A directive similar to `ngForOf` to be used for rendering data inside a virtual scrolling\n * container.\n */\n@Directive({\n  selector: '[cdkVirtualFor][cdkVirtualForOf]',\n})\nexport class CdkVirtualForOf<T> implements CollectionViewer, DoCheck, OnDestroy {\n  /** Emits when the rendered view of the data changes. */\n  viewChange = new Subject<ListRange>();\n\n  /** Subject that emits when a new DataSource instance is given. */\n  private _dataSourceChanges = new Subject<DataSource<T>>();\n\n  /** The DataSource to display. */\n  @Input()\n  get cdkVirtualForOf(): DataSource<T> | Observable<T[]> | NgIterable<T> | null | undefined {\n    return this._cdkVirtualForOf;\n  }\n  set cdkVirtualForOf(value: DataSource<T> | Observable<T[]> | NgIterable<T> | null | undefined) {\n    this._cdkVirtualForOf = value;\n    if (isDataSource(value)) {\n      this._dataSourceChanges.next(value);\n    } else {\n      // Slice the value if its an NgIterable to ensure we're working with an array.\n      this._dataSourceChanges.next(new ArrayDataSource<T>(\n          isObservable(value) ? value : Array.prototype.slice.call(value || [])));\n    }\n  }\n  _cdkVirtualForOf: DataSource<T> | Observable<T[]> | NgIterable<T> | null | undefined;\n\n  /**\n   * The `TrackByFunction` to use for tracking changes. The `TrackByFunction` takes the index and\n   * the item and produces a value to be used as the item's identity when tracking changes.\n   */\n  @Input()\n  get cdkVirtualForTrackBy(): TrackByFunction<T> | undefined {\n    return this._cdkVirtualForTrackBy;\n  }\n  set cdkVirtualForTrackBy(fn: TrackByFunction<T> | undefined) {\n    this._needsUpdate = true;\n    this._cdkVirtualForTrackBy = fn ?\n        (index, item) => fn(index + (this._renderedRange ? this._renderedRange.start : 0), item) :\n        undefined;\n  }\n  private _cdkVirtualForTrackBy: TrackByFunction<T> | undefined;\n\n  /** The template used to stamp out new elements. */\n  @Input()\n  set cdkVirtualForTemplate(value: TemplateRef<CdkVirtualForOfContext<T>>) {\n    if (value) {\n      this._needsUpdate = true;\n      this._template = value;\n    }\n  }\n\n  /**\n   * The size of the cache used to store templates that are not being used for re-use later.\n   * Setting the cache size to `0` will disable caching. Defaults to 20 templates.\n   */\n  @Input() cdkVirtualForTemplateCacheSize: number = 20;\n\n  /** Emits whenever the data in the current DataSource changes. */\n  dataStream: Observable<T[] | ReadonlyArray<T>> = this._dataSourceChanges\n      .pipe(\n          // Start off with null `DataSource`.\n          startWith(null!),\n          // Bundle up the previous and current data sources so we can work with both.\n          pairwise(),\n          // Use `_changeDataSource` to disconnect from the previous data source and connect to the\n          // new one, passing back a stream of data changes which we run through `switchMap` to give\n          // us a data stream that emits the latest data from whatever the current `DataSource` is.\n          switchMap(([prev, cur]) => this._changeDataSource(prev, cur)),\n          // Replay the last emitted data when someone subscribes.\n          shareReplay(1));\n\n  /** The differ used to calculate changes to the data. */\n  private _differ: IterableDiffer<T> | null = null;\n\n  /** The most recent data emitted from the DataSource. */\n  private _data: T[] | ReadonlyArray<T>;\n\n  /** The currently rendered items. */\n  private _renderedItems: T[];\n\n  /** The currently rendered range of indices. */\n  private _renderedRange: ListRange;\n\n  /**\n   * The template cache used to hold on ot template instancess that have been stamped out, but don't\n   * currently need to be rendered. These instances will be reused in the future rather than\n   * stamping out brand new ones.\n   */\n  private _templateCache: EmbeddedViewRef<CdkVirtualForOfContext<T>>[] = [];\n\n  /** Whether the rendered data should be updated during the next ngDoCheck cycle. */\n  private _needsUpdate = false;\n\n  private _destroyed = new Subject<void>();\n\n  constructor(\n      /** The view container to add items to. */\n      private _viewContainerRef: ViewContainerRef,\n      /** The template to use when stamping out new items. */\n      private _template: TemplateRef<CdkVirtualForOfContext<T>>,\n      /** The set of available differs. */\n      private _differs: IterableDiffers,\n      /** The virtual scrolling viewport that these items are being rendered in. */\n      @SkipSelf() private _viewport: CdkVirtualScrollViewport,\n      ngZone: NgZone) {\n    this.dataStream.subscribe(data => {\n      this._data = data;\n      this._onRenderedDataChange();\n    });\n    this._viewport.renderedRangeStream.pipe(takeUntil(this._destroyed)).subscribe(range => {\n      this._renderedRange = range;\n      ngZone.run(() => this.viewChange.next(this._renderedRange));\n      this._onRenderedDataChange();\n    });\n    this._viewport.attach(this);\n  }\n\n  /**\n   * Measures the combined size (width for horizontal orientation, height for vertical) of all items\n   * in the specified range. Throws an error if the range includes items that are not currently\n   * rendered.\n   */\n  measureRangeSize(range: ListRange, orientation: 'horizontal' | 'vertical'): number {\n    if (range.start >= range.end) {\n      return 0;\n    }\n    if (range.start < this._renderedRange.start || range.end > this._renderedRange.end) {\n      throw Error(`Error: attempted to measure an item that isn't rendered.`);\n    }\n\n    // The index into the list of rendered views for the first item in the range.\n    const renderedStartIndex = range.start - this._renderedRange.start;\n    // The length of the range we're measuring.\n    const rangeLen = range.end - range.start;\n\n    // Loop over all root nodes for all items in the range and sum up their size.\n    let totalSize = 0;\n    let i = rangeLen;\n    while (i--) {\n      const view = this._viewContainerRef.get(i + renderedStartIndex) as\n          EmbeddedViewRef<CdkVirtualForOfContext<T>> | null;\n      let j = view ? view.rootNodes.length : 0;\n      while (j--) {\n        totalSize += getSize(orientation, view!.rootNodes[j]);\n      }\n    }\n\n    return totalSize;\n  }\n\n  ngDoCheck() {\n    if (this._differ && this._needsUpdate) {\n      // TODO(mmalerba): We should differentiate needs update due to scrolling and a new portion of\n      // this list being rendered (can use simpler algorithm) vs needs update due to data actually\n      // changing (need to do this diff).\n      const changes = this._differ.diff(this._renderedItems);\n      if (!changes) {\n        this._updateContext();\n      } else {\n        this._applyChanges(changes);\n      }\n      this._needsUpdate = false;\n    }\n  }\n\n  ngOnDestroy() {\n    this._viewport.detach();\n\n    this._dataSourceChanges.next();\n    this._dataSourceChanges.complete();\n    this.viewChange.complete();\n\n    this._destroyed.next();\n    this._destroyed.complete();\n\n    for (let view of this._templateCache) {\n      view.destroy();\n    }\n  }\n\n  /** React to scroll state changes in the viewport. */\n  private _onRenderedDataChange() {\n    if (!this._renderedRange) {\n      return;\n    }\n    this._renderedItems = this._data.slice(this._renderedRange.start, this._renderedRange.end);\n    if (!this._differ) {\n      this._differ = this._differs.find(this._renderedItems).create(this.cdkVirtualForTrackBy);\n    }\n    this._needsUpdate = true;\n  }\n\n  /** Swap out one `DataSource` for another. */\n  private _changeDataSource(oldDs: DataSource<T> | null, newDs: DataSource<T> | null):\n    Observable<T[] | ReadonlyArray<T>> {\n\n    if (oldDs) {\n      oldDs.disconnect(this);\n    }\n\n    this._needsUpdate = true;\n    return newDs ? newDs.connect(this) : observableOf();\n  }\n\n  /** Update the `CdkVirtualForOfContext` for all views. */\n  private _updateContext() {\n    const count = this._data.length;\n    let i = this._viewContainerRef.length;\n    while (i--) {\n      let view = this._viewContainerRef.get(i) as EmbeddedViewRef<CdkVirtualForOfContext<T>>;\n      view.context.index = this._renderedRange.start + i;\n      view.context.count = count;\n      this._updateComputedContextProperties(view.context);\n      view.detectChanges();\n    }\n  }\n\n  /** Apply changes to the DOM. */\n  private _applyChanges(changes: IterableChanges<T>) {\n    // Rearrange the views to put them in the right location.\n    changes.forEachOperation((record: IterableChangeRecord<T>,\n                              adjustedPreviousIndex: number | null,\n                              currentIndex: number | null) => {\n      if (record.previousIndex == null) {  // Item added.\n        const view = this._insertViewForNewItem(currentIndex!);\n        view.context.$implicit = record.item;\n      } else if (currentIndex == null) {  // Item removed.\n        this._cacheView(this._detachView(adjustedPreviousIndex !));\n      } else {  // Item moved.\n        const view = this._viewContainerRef.get(adjustedPreviousIndex!) as\n            EmbeddedViewRef<CdkVirtualForOfContext<T>>;\n        this._viewContainerRef.move(view, currentIndex);\n        view.context.$implicit = record.item;\n      }\n    });\n\n    // Update $implicit for any items that had an identity change.\n    changes.forEachIdentityChange((record: IterableChangeRecord<T>) => {\n      const view = this._viewContainerRef.get(record.currentIndex!) as\n          EmbeddedViewRef<CdkVirtualForOfContext<T>>;\n      view.context.$implicit = record.item;\n    });\n\n    // Update the context variables on all items.\n    const count = this._data.length;\n    let i = this._viewContainerRef.length;\n    while (i--) {\n      const view = this._viewContainerRef.get(i) as EmbeddedViewRef<CdkVirtualForOfContext<T>>;\n      view.context.index = this._renderedRange.start + i;\n      view.context.count = count;\n      this._updateComputedContextProperties(view.context);\n    }\n  }\n\n  /** Cache the given detached view. */\n  private _cacheView(view: EmbeddedViewRef<CdkVirtualForOfContext<T>>) {\n    if (this._templateCache.length < this.cdkVirtualForTemplateCacheSize) {\n      this._templateCache.push(view);\n    } else {\n      const index = this._viewContainerRef.indexOf(view);\n\n      // It's very unlikely that the index will ever be -1, but just in case,\n      // destroy the view on its own, otherwise destroy it through the\n      // container to ensure that all the references are removed.\n      if (index === -1) {\n        view.destroy();\n      } else {\n        this._viewContainerRef.remove(index);\n      }\n    }\n  }\n\n  /** Inserts a view for a new item, either from the cache or by creating a new one. */\n  private _insertViewForNewItem(index: number): EmbeddedViewRef<CdkVirtualForOfContext<T>> {\n    return this._insertViewFromCache(index) || this._createEmbeddedViewAt(index);\n  }\n\n  /** Update the computed properties on the `CdkVirtualForOfContext`. */\n  private _updateComputedContextProperties(context: CdkVirtualForOfContext<any>) {\n    context.first = context.index === 0;\n    context.last = context.index === context.count - 1;\n    context.even = context.index % 2 === 0;\n    context.odd = !context.even;\n  }\n\n  /** Creates a new embedded view and moves it to the given index */\n  private _createEmbeddedViewAt(index: number): EmbeddedViewRef<CdkVirtualForOfContext<T>> {\n    // Note that it's important that we insert the item directly at the proper index,\n    // rather than inserting it and the moving it in place, because if there's a directive\n    // on the same node that injects the `ViewContainerRef`, Angular will insert another\n    // comment node which can throw off the move when it's being repeated for all items.\n    return this._viewContainerRef.createEmbeddedView(this._template, {\n      $implicit: null!,\n      // It's guaranteed that the iterable is not \"undefined\" or \"null\" because we only\n      // generate views for elements if the \"cdkVirtualForOf\" iterable has elements.\n      cdkVirtualForOf: this._cdkVirtualForOf!,\n      index: -1,\n      count: -1,\n      first: false,\n      last: false,\n      odd: false,\n      even: false\n    }, index);\n  }\n\n  /** Inserts a recycled view from the cache at the given index. */\n  private _insertViewFromCache(index: number): EmbeddedViewRef<CdkVirtualForOfContext<T>>|null {\n    const cachedView = this._templateCache.pop();\n    if (cachedView) {\n      this._viewContainerRef.insert(cachedView, index);\n    }\n    return cachedView || null;\n  }\n\n  /** Detaches the embedded view at the given index. */\n  private _detachView(index: number): EmbeddedViewRef<CdkVirtualForOfContext<T>> {\n    return this._viewContainerRef.detach(index) as\n        EmbeddedViewRef<CdkVirtualForOfContext<T>>;\n  }\n}\n"]}