@angular/cdk
Version:
Angular Material Component Development Kit
300 lines • 45.1 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, _RecycleViewRepeaterStrategy, _VIEW_REPEATER_STRATEGY, } from '@angular/cdk/collections';
import { Directive, Inject, Input, IterableDiffers, NgZone, SkipSelf, TemplateRef, ViewContainerRef, } from '@angular/core';
import { coerceNumberProperty } from '@angular/cdk/coercion';
import { Subject, of as observableOf, isObservable } from 'rxjs';
import { pairwise, shareReplay, startWith, switchMap, takeUntil } from 'rxjs/operators';
import { CdkVirtualScrollViewport } from './virtual-scroll-viewport';
import * as i0 from "@angular/core";
import * as i1 from "./virtual-scroll-viewport";
import * as i2 from "@angular/cdk/collections";
/** Helper to extract the offset of a DOM Node in a certain direction. */
function getOffset(orientation, direction, node) {
const el = node;
if (!el.getBoundingClientRect) {
return 0;
}
const rect = el.getBoundingClientRect();
if (orientation === 'horizontal') {
return direction === 'start' ? rect.left : rect.right;
}
return direction === 'start' ? rect.top : rect.bottom;
}
/**
* A directive similar to `ngForOf` to be used for rendering data inside a virtual scrolling
* container.
*/
class CdkVirtualForOf {
/** The DataSource to display. */
get cdkVirtualForOf() {
return this._cdkVirtualForOf;
}
set cdkVirtualForOf(value) {
this._cdkVirtualForOf = value;
if (isDataSource(value)) {
this._dataSourceChanges.next(value);
}
else {
// If value is an an NgIterable, convert it to an array.
this._dataSourceChanges.next(new ArrayDataSource(isObservable(value) ? value : Array.from(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;
}
}
/**
* 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.
*/
get cdkVirtualForTemplateCacheSize() {
return this._viewRepeater.viewCacheSize;
}
set cdkVirtualForTemplateCacheSize(size) {
this._viewRepeater.viewCacheSize = coerceNumberProperty(size);
}
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 strategy used to render items in the virtual scroll viewport. */
_viewRepeater,
/** The virtual scrolling viewport that these items are being rendered in. */
_viewport, ngZone) {
this._viewContainerRef = _viewContainerRef;
this._template = _template;
this._differs = _differs;
this._viewRepeater = _viewRepeater;
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();
/** 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;
/** 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;
if (this.viewChange.observers.length) {
ngZone.run(() => this.viewChange.next(this._renderedRange));
}
this._onRenderedDataChange();
});
this._viewport.attach(this);
}
/**
* 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) &&
(typeof ngDevMode === 'undefined' || ngDevMode)) {
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 the views, find the first and land node and compute the size by subtracting
// the top of the first node from the bottom of the last one.
let firstNode;
let lastNode;
// Find the first node by starting from the beginning and going forwards.
for (let i = 0; i < rangeLen; i++) {
const view = this._viewContainerRef.get(i + renderedStartIndex);
if (view && view.rootNodes.length) {
firstNode = lastNode = view.rootNodes[0];
break;
}
}
// Find the last node by starting from the end and going backwards.
for (let i = rangeLen - 1; i > -1; i--) {
const view = this._viewContainerRef.get(i + renderedStartIndex);
if (view && view.rootNodes.length) {
lastNode = view.rootNodes[view.rootNodes.length - 1];
break;
}
}
return firstNode && lastNode
? getOffset(orientation, 'end', lastNode) - getOffset(orientation, 'start', firstNode)
: 0;
}
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();
this._viewRepeater.detach();
}
/** 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) {
// Use a wrapper function for the `trackBy` so any new values are
// picked up automatically without having to recreate the differ.
this._differ = this._differs.find(this._renderedItems).create((index, item) => {
return this.cdkVirtualForTrackBy ? this.cdkVirtualForTrackBy(index, item) : item;
});
}
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--) {
const 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) {
this._viewRepeater.applyChanges(changes, this._viewContainerRef, (record, _adjustedPreviousIndex, currentIndex) => this._getEmbeddedViewArgs(record, currentIndex), record => 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);
}
}
/** 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;
}
_getEmbeddedViewArgs(record, 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 {
templateRef: this._template,
context: {
$implicit: record.item,
// 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,
};
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: CdkVirtualForOf, deps: [{ token: i0.ViewContainerRef }, { token: i0.TemplateRef }, { token: i0.IterableDiffers }, { token: _VIEW_REPEATER_STRATEGY }, { token: i1.CdkVirtualScrollViewport, skipSelf: true }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.0.0", type: CdkVirtualForOf, isStandalone: true, selector: "[cdkVirtualFor][cdkVirtualForOf]", inputs: { cdkVirtualForOf: "cdkVirtualForOf", cdkVirtualForTrackBy: "cdkVirtualForTrackBy", cdkVirtualForTemplate: "cdkVirtualForTemplate", cdkVirtualForTemplateCacheSize: "cdkVirtualForTemplateCacheSize" }, providers: [{ provide: _VIEW_REPEATER_STRATEGY, useClass: _RecycleViewRepeaterStrategy }], ngImport: i0 }); }
}
export { CdkVirtualForOf };
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: CdkVirtualForOf, decorators: [{
type: Directive,
args: [{
selector: '[cdkVirtualFor][cdkVirtualForOf]',
providers: [{ provide: _VIEW_REPEATER_STRATEGY, useClass: _RecycleViewRepeaterStrategy }],
standalone: true,
}]
}], ctorParameters: function () { return [{ type: i0.ViewContainerRef }, { type: i0.TemplateRef }, { type: i0.IterableDiffers }, { type: i2._RecycleViewRepeaterStrategy, decorators: [{
type: Inject,
args: [_VIEW_REPEATER_STRATEGY]
}] }, { type: i1.CdkVirtualScrollViewport, decorators: [{
type: SkipSelf
}] }, { type: i0.NgZone }]; }, 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  _RecycleViewRepeaterStrategy,\n  _VIEW_REPEATER_STRATEGY,\n  _ViewRepeaterItemInsertArgs,\n} from '@angular/cdk/collections';\nimport {\n  Directive,\n  DoCheck,\n  EmbeddedViewRef,\n  Inject,\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 {coerceNumberProperty, NumberInput} from '@angular/cdk/coercion';\nimport {Observable, Subject, of as observableOf, isObservable} from 'rxjs';\nimport {pairwise, shareReplay, startWith, switchMap, takeUntil} from 'rxjs/operators';\nimport {CdkVirtualScrollRepeater} from './virtual-scroll-repeater';\nimport {CdkVirtualScrollViewport} from './virtual-scroll-viewport';\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/** Helper to extract the offset of a DOM Node in a certain direction. */\nfunction getOffset(orientation: 'horizontal' | 'vertical', direction: 'start' | 'end', node: Node) {\n  const el = node as Element;\n  if (!el.getBoundingClientRect) {\n    return 0;\n  }\n  const rect = el.getBoundingClientRect();\n\n  if (orientation === 'horizontal') {\n    return direction === 'start' ? rect.left : rect.right;\n  }\n\n  return direction === 'start' ? rect.top : rect.bottom;\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  providers: [{provide: _VIEW_REPEATER_STRATEGY, useClass: _RecycleViewRepeaterStrategy}],\n  standalone: true,\n})\nexport class CdkVirtualForOf<T>\n  implements CdkVirtualScrollRepeater<T>, CollectionViewer, DoCheck, OnDestroy\n{\n  /** Emits when the rendered view of the data changes. */\n  readonly viewChange = new Subject<ListRange>();\n\n  /** Subject that emits when a new DataSource instance is given. */\n  private readonly _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      // If value is an an NgIterable, convert it to an array.\n      this._dataSourceChanges.next(\n        new ArrayDataSource<T>(isObservable(value) ? value : Array.from(value || [])),\n      );\n    }\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()\n  get cdkVirtualForTemplateCacheSize(): number {\n    return this._viewRepeater.viewCacheSize;\n  }\n  set cdkVirtualForTemplateCacheSize(size: NumberInput) {\n    this._viewRepeater.viewCacheSize = coerceNumberProperty(size);\n  }\n\n  /** Emits whenever the data in the current DataSource changes. */\n  readonly dataStream: Observable<readonly T[]> = this._dataSourceChanges.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\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: readonly 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  /** Whether the rendered data should be updated during the next ngDoCheck cycle. */\n  private _needsUpdate = false;\n\n  private readonly _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 strategy used to render items in the virtual scroll viewport. */\n    @Inject(_VIEW_REPEATER_STRATEGY)\n    private _viewRepeater: _RecycleViewRepeaterStrategy<T, T, CdkVirtualForOfContext<T>>,\n    /** The virtual scrolling viewport that these items are being rendered in. */\n    @SkipSelf() private _viewport: CdkVirtualScrollViewport,\n    ngZone: NgZone,\n  ) {\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      if (this.viewChange.observers.length) {\n        ngZone.run(() => this.viewChange.next(this._renderedRange));\n      }\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 (\n      (range.start < this._renderedRange.start || range.end > this._renderedRange.end) &&\n      (typeof ngDevMode === 'undefined' || ngDevMode)\n    ) {\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 the views, find the first and land node and compute the size by subtracting\n    // the top of the first node from the bottom of the last one.\n    let firstNode: HTMLElement | undefined;\n    let lastNode: HTMLElement | undefined;\n\n    // Find the first node by starting from the beginning and going forwards.\n    for (let i = 0; i < rangeLen; i++) {\n      const view = this._viewContainerRef.get(i + renderedStartIndex) as EmbeddedViewRef<\n        CdkVirtualForOfContext<T>\n      > | null;\n      if (view && view.rootNodes.length) {\n        firstNode = lastNode = view.rootNodes[0];\n        break;\n      }\n    }\n\n    // Find the last node by starting from the end and going backwards.\n    for (let i = rangeLen - 1; i > -1; i--) {\n      const view = this._viewContainerRef.get(i + renderedStartIndex) as EmbeddedViewRef<\n        CdkVirtualForOfContext<T>\n      > | null;\n      if (view && view.rootNodes.length) {\n        lastNode = view.rootNodes[view.rootNodes.length - 1];\n        break;\n      }\n    }\n\n    return firstNode && lastNode\n      ? getOffset(orientation, 'end', lastNode) - getOffset(orientation, 'start', firstNode)\n      : 0;\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    this._viewRepeater.detach();\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      // Use a wrapper function for the `trackBy` so any new values are\n      // picked up automatically without having to recreate the differ.\n      this._differ = this._differs.find(this._renderedItems).create((index, item) => {\n        return this.cdkVirtualForTrackBy ? this.cdkVirtualForTrackBy(index, item) : item;\n      });\n    }\n    this._needsUpdate = true;\n  }\n\n  /** Swap out one `DataSource` for another. */\n  private _changeDataSource(\n    oldDs: DataSource<T> | null,\n    newDs: DataSource<T> | null,\n  ): Observable<readonly T[]> {\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      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      view.detectChanges();\n    }\n  }\n\n  /** Apply changes to the DOM. */\n  private _applyChanges(changes: IterableChanges<T>) {\n    this._viewRepeater.applyChanges(\n      changes,\n      this._viewContainerRef,\n      (\n        record: IterableChangeRecord<T>,\n        _adjustedPreviousIndex: number | null,\n        currentIndex: number | null,\n      ) => this._getEmbeddedViewArgs(record, currentIndex!),\n      record => record.item,\n    );\n\n    // Update $implicit for any items that had an identity change.\n    changes.forEachIdentityChange((record: IterableChangeRecord<T>) => {\n      const view = this._viewContainerRef.get(record.currentIndex!) as EmbeddedViewRef<\n        CdkVirtualForOfContext<T>\n      >;\n      view.context.$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  /** 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  private _getEmbeddedViewArgs(\n    record: IterableChangeRecord<T>,\n    index: number,\n  ): _ViewRepeaterItemInsertArgs<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 {\n      templateRef: this._template,\n      context: {\n        $implicit: record.item,\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      },\n      index,\n    };\n  }\n}\n"]}