@angular/cdk
Version:
Angular Material Component Development Kit
314 lines • 44.8 kB
JavaScript
/**
* @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 { 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) {
const el = node;
if (!el.getBoundingClientRect) {
return 0;
}
const 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.
*/
export class CdkVirtualForOf {
constructor(
/** 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) {
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(([prev, cur]) => 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(data => {
this._data = data;
this._onRenderedDataChange();
});
this._viewport.renderedRangeStream.pipe(takeUntil(this._destroyed)).subscribe(range => {
this._renderedRange = range;
ngZone.run(() => this.viewChange.next(this._renderedRange));
this._onRenderedDataChange();
});
this._viewport.attach(this);
}
/** The DataSource to display. */
get cdkVirtualForOf() {
return this._cdkVirtualForOf;
}
set cdkVirtualForOf(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 || [])));
}
}
/**
* 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 cdkVirtualForTrackBy() {
return this._cdkVirtualForTrackBy;
}
set cdkVirtualForTrackBy(fn) {
this._needsUpdate = true;
this._cdkVirtualForTrackBy = fn ?
(index, item) => fn(index + (this._renderedRange ? this._renderedRange.start : 0), item) :
undefined;
}
/** The template used to stamp out new elements. */
set cdkVirtualForTemplate(value) {
if (value) {
this._needsUpdate = true;
this._template = value;
}
}
/**
* 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.
*/
measureRangeSize(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.
const renderedStartIndex = range.start - this._renderedRange.start;
// The length of the range we're measuring.
const rangeLen = range.end - range.start;
// Loop over all root nodes for all items in the range and sum up their size.
let totalSize = 0;
let i = rangeLen;
while (i--) {
const view = this._viewContainerRef.get(i + renderedStartIndex);
let j = view ? view.rootNodes.length : 0;
while (j--) {
totalSize += getSize(orientation, view.rootNodes[j]);
}
}
return totalSize;
}
ngDoCheck() {
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).
const changes = this._differ.diff(this._renderedItems);
if (!changes) {
this._updateContext();
}
else {
this._applyChanges(changes);
}
this._needsUpdate = false;
}
}
ngOnDestroy() {
this._viewport.detach();
this._dataSourceChanges.next(undefined);
this._dataSourceChanges.complete();
this.viewChange.complete();
this._destroyed.next();
this._destroyed.complete();
for (let view of this._templateCache) {
view.destroy();
}
}
/** React to scroll state changes in the viewport. */
_onRenderedDataChange() {
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. */
_changeDataSource(oldDs, newDs) {
if (oldDs) {
oldDs.disconnect(this);
}
this._needsUpdate = true;
return newDs ? newDs.connect(this) : observableOf();
}
/** Update the `CdkVirtualForOfContext` for all views. */
_updateContext() {
const count = this._data.length;
let i = this._viewContainerRef.length;
while (i--) {
let 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. */
_applyChanges(changes) {
// Rearrange the views to put them in the right location.
changes.forEachOperation((record, adjustedPreviousIndex, currentIndex) => {
if (record.previousIndex == null) { // Item added.
const view = this._insertViewForNewItem(currentIndex);
view.context.$implicit = record.item;
}
else if (currentIndex == null) { // Item removed.
this._cacheView(this._detachView(adjustedPreviousIndex));
}
else { // Item moved.
const view = this._viewContainerRef.get(adjustedPreviousIndex);
this._viewContainerRef.move(view, currentIndex);
view.context.$implicit = record.item;
}
});
// Update $implicit for any items that had an identity change.
changes.forEachIdentityChange((record) => {
const view = this._viewContainerRef.get(record.currentIndex);
view.context.$implicit = record.item;
});
// Update the context variables on all items.
const count = this._data.length;
let i = this._viewContainerRef.length;
while (i--) {
const 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. */
_cacheView(view) {
if (this._templateCache.length < this.cdkVirtualForTemplateCacheSize) {
this._templateCache.push(view);
}
else {
const 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. */
_insertViewForNewItem(index) {
return this._insertViewFromCache(index) || this._createEmbeddedViewAt(index);
}
/** Update the computed properties on the `CdkVirtualForOfContext`. */
_updateComputedContextProperties(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 */
_createEmbeddedViewAt(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. */
_insertViewFromCache(index) {
const cachedView = this._templateCache.pop();
if (cachedView) {
this._viewContainerRef.insert(cachedView, index);
}
return cachedView || null;
}
/** Detaches the embedded view at the given index. */
_detachView(index) {
return this._viewContainerRef.detach(index);
}
}
CdkVirtualForOf.decorators = [
{ type: Directive, args: [{
selector: '[cdkVirtualFor][cdkVirtualForOf]',
},] }
];
CdkVirtualForOf.ctorParameters = () => [
{ 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 }]
};
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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(undefined!);\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"]}