/** * @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 { Directionality } from '@angular/cdk/bidi'; import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ElementRef, Inject, Input, NgZone, Optional, Output, ViewChild, ViewEncapsulation, } from '@angular/core'; import { animationFrameScheduler, asapScheduler, Observable, Subject, Subscription, } from 'rxjs'; import { auditTime, startWith, takeUntil } from 'rxjs/operators'; import { ScrollDispatcher } from './scroll-dispatcher'; import { CdkScrollable } from './scrollable'; import { VIRTUAL_SCROLL_STRATEGY } from './virtual-scroll-strategy'; import { ViewportRuler } from './viewport-ruler'; import { coerceBooleanProperty } from '@angular/cdk/coercion'; /** Checks if the given ranges are equal. */ function rangesEqual(r1, r2) { return r1.start == r2.start && r1.end == r2.end; } /** * Scheduler to be used for scroll events. Needs to fall back to * something that doesn't rely on requestAnimationFrame on environments * that don't support it (e.g. server-side rendering). */ const SCROLL_SCHEDULER = typeof requestAnimationFrame !== 'undefined' ? animationFrameScheduler : asapScheduler; /** A viewport that virtualizes its scrolling with the help of `CdkVirtualForOf`. */ export class CdkVirtualScrollViewport extends CdkScrollable { constructor(elementRef, _changeDetectorRef, ngZone, _scrollStrategy, dir, scrollDispatcher, viewportRuler) { super(elementRef, scrollDispatcher, ngZone, dir); this.elementRef = elementRef; this._changeDetectorRef = _changeDetectorRef; this._scrollStrategy = _scrollStrategy; /** Emits when the viewport is detached from a CdkVirtualForOf. */ this._detachedSubject = new Subject(); /** Emits when the rendered range changes. */ this._renderedRangeSubject = new Subject(); this._orientation = 'vertical'; this._appendOnly = false; // Note: we don't use the typical EventEmitter here because we need to subscribe to the scroll // strategy lazily (i.e. only if the user is actually listening to the events). We do this because // depending on how the strategy calculates the scrolled index, it may come at a cost to // performance. /** Emits when the index of the first element visible in the viewport changes. */ this.scrolledIndexChange = new Observable((observer) => this._scrollStrategy.scrolledIndexChange.subscribe(index => Promise.resolve().then(() => this.ngZone.run(() => observer.next(index))))); /** A stream that emits whenever the rendered range changes. */ this.renderedRangeStream = this._renderedRangeSubject; /** * The total size of all content (in pixels), including content that is not currently rendered. */ this._totalContentSize = 0; /** A string representing the `style.width` property value to be used for the spacer element. */ this._totalContentWidth = ''; /** A string representing the `style.height` property value to be used for the spacer element. */ this._totalContentHeight = ''; /** The currently rendered range of indices. */ this._renderedRange = { start: 0, end: 0 }; /** The length of the data bound to this viewport (in number of items). */ this._dataLength = 0; /** The size of the viewport (in pixels). */ this._viewportSize = 0; /** The last rendered content offset that was set. */ this._renderedContentOffset = 0; /** * Whether the last rendered content offset was to the end of the content (and therefore needs to * be rewritten as an offset to the start of the content). */ this._renderedContentOffsetNeedsRewrite = false; /** Whether there is a pending change detection cycle. */ this._isChangeDetectionPending = false; /** A list of functions to run after the next change detection cycle. */ this._runAfterChangeDetection = []; /** Subscription to changes in the viewport size. */ this._viewportChanges = Subscription.EMPTY; if (!_scrollStrategy && (typeof ngDevMode === 'undefined' || ngDevMode)) { throw Error('Error: cdk-virtual-scroll-viewport requires the "itemSize" property to be set.'); } this._viewportChanges = viewportRuler.change().subscribe(() => { this.checkViewportSize(); }); } /** The direction the viewport scrolls. */ get orientation() { return this._orientation; } set orientation(orientation) { if (this._orientation !== orientation) { this._orientation = orientation; this._calculateSpacerSize(); } } /** * Whether rendered items should persist in the DOM after scrolling out of view. By default, items * will be removed. */ get appendOnly() { return this._appendOnly; } set appendOnly(value) { this._appendOnly = coerceBooleanProperty(value); } ngOnInit() { super.ngOnInit(); // It's still too early to measure the viewport at this point. Deferring with a promise allows // the Viewport to be rendered with the correct size before we measure. We run this outside the // zone to avoid causing more change detection cycles. We handle the change detection loop // ourselves instead. this.ngZone.runOutsideAngular(() => Promise.resolve().then(() => { this._measureViewportSize(); this._scrollStrategy.attach(this); this.elementScrolled() .pipe( // Start off with a fake scroll event so we properly detect our initial position. startWith(null), // Collect multiple events into one until the next animation frame. This way if // there are multiple scroll events in the same frame we only need to recheck // our layout once. auditTime(0, SCROLL_SCHEDULER)) .subscribe(() => this._scrollStrategy.onContentScrolled()); this._markChangeDetectionNeeded(); })); } ngOnDestroy() { this.detach(); this._scrollStrategy.detach(); // Complete all subjects this._renderedRangeSubject.complete(); this._detachedSubject.complete(); this._viewportChanges.unsubscribe(); super.ngOnDestroy(); } /** Attaches a `CdkVirtualScrollRepeater` to this viewport. */ attach(forOf) { if (this._forOf && (typeof ngDevMode === 'undefined' || ngDevMode)) { throw Error('CdkVirtualScrollViewport is already attached.'); } // Subscribe to the data stream of the CdkVirtualForOf to keep track of when the data length // changes. Run outside the zone to avoid triggering change detection, since we're managing the // change detection loop ourselves. this.ngZone.runOutsideAngular(() => { this._forOf = forOf; this._forOf.dataStream.pipe(takeUntil(this._detachedSubject)).subscribe(data => { const newLength = data.length; if (newLength !== this._dataLength) { this._dataLength = newLength; this._scrollStrategy.onDataLengthChanged(); } this._doChangeDetection(); }); }); } /** Detaches the current `CdkVirtualForOf`. */ detach() { this._forOf = null; this._detachedSubject.next(); } /** Gets the length of the data bound to this viewport (in number of items). */ getDataLength() { return this._dataLength; } /** Gets the size of the viewport (in pixels). */ getViewportSize() { return this._viewportSize; } // TODO(mmalerba): This is technically out of sync with what's really rendered until a render // cycle happens. I'm being careful to only call it after the render cycle is complete and before // setting it to something else, but its error prone and should probably be split into // `pendingRange` and `renderedRange`, the latter reflecting whats actually in the DOM. /** Get the current rendered range of items. */ getRenderedRange() { return this._renderedRange; } /** * Sets the total size of all content (in pixels), including content that is not currently * rendered. */ setTotalContentSize(size) { if (this._totalContentSize !== size) { this._totalContentSize = size; this._calculateSpacerSize(); this._markChangeDetectionNeeded(); } } /** Sets the currently rendered range of indices. */ setRenderedRange(range) { if (!rangesEqual(this._renderedRange, range)) { if (this.appendOnly) { range = { start: 0, end: Math.max(this._renderedRange.end, range.end) }; } this._renderedRangeSubject.next(this._renderedRange = range); this._markChangeDetectionNeeded(() => this._scrollStrategy.onContentRendered()); } } /** * Gets the offset from the start of the viewport to the start of the rendered data (in pixels). */ getOffsetToRenderedContentStart() { return this._renderedContentOffsetNeedsRewrite ? null : this._renderedContentOffset; } /** * Sets the offset from the start of the viewport to either the start or end of the rendered data * (in pixels). */ setRenderedContentOffset(offset, to = 'to-start') { // For a horizontal viewport in a right-to-left language we need to translate along the x-axis // in the negative direction. const isRtl = this.dir && this.dir.value == 'rtl'; const isHorizontal = this.orientation == 'horizontal'; const axis = isHorizontal ? 'X' : 'Y'; const axisDirection = isHorizontal && isRtl ? -1 : 1; let transform = `translate${axis}(${Number(axisDirection * offset)}px)`; this._renderedContentOffset = offset; if (to === 'to-end') { transform += ` translate${axis}(-100%)`; // The viewport should rewrite this as a `to-start` offset on the next render cycle. Otherwise // elements will appear to expand in the wrong direction (e.g. `mat-expansion-panel` would // expand upward). this._renderedContentOffsetNeedsRewrite = true; } if (this._renderedContentTransform != transform) { // We know this value is safe because we parse `offset` with `Number()` before passing it // into the string. this._renderedContentTransform = transform; this._markChangeDetectionNeeded(() => { if (this._renderedContentOffsetNeedsRewrite) { this._renderedContentOffset -= this.measureRenderedContentSize(); this._renderedContentOffsetNeedsRewrite = false; this.setRenderedContentOffset(this._renderedContentOffset); } else { this._scrollStrategy.onRenderedOffsetChanged(); } }); } } /** * Scrolls to the given offset from the start of the viewport. Please note that this is not always * the same as setting `scrollTop` or `scrollLeft`. In a horizontal viewport with right-to-left * direction, this would be the equivalent of setting a fictional `scrollRight` property. * @param offset The offset to scroll to. * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`. */ scrollToOffset(offset, behavior = 'auto') { const options = { behavior }; if (this.orientation === 'horizontal') { options.start = offset; } else { options.top = offset; } this.scrollTo(options); } /** * Scrolls to the offset for the given index. * @param index The index of the element to scroll to. * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`. */ scrollToIndex(index, behavior = 'auto') { this._scrollStrategy.scrollToIndex(index, behavior); } /** * Gets the current scroll offset from the start of the viewport (in pixels). * @param from The edge to measure the offset from. Defaults to 'top' in vertical mode and 'start' * in horizontal mode. */ measureScrollOffset(from) { return from ? super.measureScrollOffset(from) : super.measureScrollOffset(this.orientation === 'horizontal' ? 'start' : 'top'); } /** Measure the combined size of all of the rendered items. */ measureRenderedContentSize() { const contentEl = this._contentWrapper.nativeElement; return this.orientation === 'horizontal' ? contentEl.offsetWidth : contentEl.offsetHeight; } /** * Measure the total combined size of the given range. Throws if the range includes items that are * not rendered. */ measureRangeSize(range) { if (!this._forOf) { return 0; } return this._forOf.measureRangeSize(range, this.orientation); } /** Update the viewport dimensions and re-render. */ checkViewportSize() { // TODO: Cleanup later when add logic for handling content resize this._measureViewportSize(); this._scrollStrategy.onDataLengthChanged(); } /** Measure the viewport size. */ _measureViewportSize() { const viewportEl = this.elementRef.nativeElement; this._viewportSize = this.orientation === 'horizontal' ? viewportEl.clientWidth : viewportEl.clientHeight; } /** Queue up change detection to run. */ _markChangeDetectionNeeded(runAfter) { if (runAfter) { this._runAfterChangeDetection.push(runAfter); } // Use a Promise to batch together calls to `_doChangeDetection`. This way if we set a bunch of // properties sequentially we only have to run `_doChangeDetection` once at the end. if (!this._isChangeDetectionPending) { this._isChangeDetectionPending = true; this.ngZone.runOutsideAngular(() => Promise.resolve().then(() => { this._doChangeDetection(); })); } } /** Run change detection. */ _doChangeDetection() { this._isChangeDetectionPending = false; // Apply the content transform. The transform can't be set via an Angular binding because // bypassSecurityTrustStyle is banned in Google. However the value is safe, it's composed of // string literals, a variable that can only be 'X' or 'Y', and user input that is run through // the `Number` function first to coerce it to a numeric value. this._contentWrapper.nativeElement.style.transform = this._renderedContentTransform; // Apply changes to Angular bindings. Note: We must call `markForCheck` to run change detection // from the root, since the repeated items are content projected in. Calling `detectChanges` // instead does not properly check the projected content. this.ngZone.run(() => this._changeDetectorRef.markForCheck()); const runAfterChangeDetection = this._runAfterChangeDetection; this._runAfterChangeDetection = []; for (const fn of runAfterChangeDetection) { fn(); } } /** Calculates the `style.width` and `style.height` for the spacer element. */ _calculateSpacerSize() { this._totalContentHeight = this.orientation === 'horizontal' ? '' : `${this._totalContentSize}px`; this._totalContentWidth = this.orientation === 'horizontal' ? `${this._totalContentSize}px` : ''; } } CdkVirtualScrollViewport.decorators = [ { type: Component, args: [{ selector: 'cdk-virtual-scroll-viewport', template: "\n
\n \n
\n\n
\n", host: { 'class': 'cdk-virtual-scroll-viewport', '[class.cdk-virtual-scroll-orientation-horizontal]': 'orientation === "horizontal"', '[class.cdk-virtual-scroll-orientation-vertical]': 'orientation !== "horizontal"', }, encapsulation: ViewEncapsulation.None, changeDetection: ChangeDetectionStrategy.OnPush, providers: [{ provide: CdkScrollable, useExisting: CdkVirtualScrollViewport, }], styles: ["cdk-virtual-scroll-viewport{display:block;position:relative;overflow:auto;contain:strict;transform:translateZ(0);will-change:scroll-position;-webkit-overflow-scrolling:touch}.cdk-virtual-scroll-content-wrapper{position:absolute;top:0;left:0;contain:content}[dir=rtl] .cdk-virtual-scroll-content-wrapper{right:0;left:auto}.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper{min-height:100%}.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>dl:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>ol:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>table:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>ul:not([cdkVirtualFor]){padding-left:0;padding-right:0;margin-left:0;margin-right:0;border-left-width:0;border-right-width:0;outline:none}.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper{min-width:100%}.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>dl:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>ol:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>table:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>ul:not([cdkVirtualFor]){padding-top:0;padding-bottom:0;margin-top:0;margin-bottom:0;border-top-width:0;border-bottom-width:0;outline:none}.cdk-virtual-scroll-spacer{position:absolute;top:0;left:0;height:1px;width:1px;transform-origin:0 0}[dir=rtl] .cdk-virtual-scroll-spacer{right:0;left:auto;transform-origin:100% 0}\n"] },] } ]; CdkVirtualScrollViewport.ctorParameters = () => [ { type: ElementRef }, { type: ChangeDetectorRef }, { type: NgZone }, { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [VIRTUAL_SCROLL_STRATEGY,] }] }, { type: Directionality, decorators: [{ type: Optional }] }, { type: ScrollDispatcher }, { type: ViewportRuler } ]; CdkVirtualScrollViewport.propDecorators = { orientation: [{ type: Input }], appendOnly: [{ type: Input }], scrolledIndexChange: [{ type: Output }], _contentWrapper: [{ type: ViewChild, args: ['contentWrapper', { static: true },] }] }; //# 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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 {Directionality} from '@angular/cdk/bidi';\nimport {ListRange} from '@angular/cdk/collections';\nimport {\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ElementRef,\n  Inject,\n  Input,\n  NgZone,\n  OnDestroy,\n  OnInit,\n  Optional,\n  Output,\n  ViewChild,\n  ViewEncapsulation,\n} from '@angular/core';\nimport {\n  animationFrameScheduler,\n  asapScheduler,\n  Observable,\n  Subject,\n  Observer,\n  Subscription,\n} from 'rxjs';\nimport {auditTime, startWith, takeUntil} from 'rxjs/operators';\nimport {ScrollDispatcher} from './scroll-dispatcher';\nimport {CdkScrollable, ExtendedScrollToOptions} from './scrollable';\nimport {VIRTUAL_SCROLL_STRATEGY, VirtualScrollStrategy} from './virtual-scroll-strategy';\nimport {ViewportRuler} from './viewport-ruler';\nimport {CdkVirtualScrollRepeater} from './virtual-scroll-repeater';\nimport {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\n\n/** Checks if the given ranges are equal. */\nfunction rangesEqual(r1: ListRange, r2: ListRange): boolean {\n  return r1.start == r2.start && r1.end == r2.end;\n}\n\n/**\n * Scheduler to be used for scroll events. Needs to fall back to\n * something that doesn't rely on requestAnimationFrame on environments\n * that don't support it (e.g. server-side rendering).\n */\nconst SCROLL_SCHEDULER =\n    typeof requestAnimationFrame !== 'undefined' ? animationFrameScheduler : asapScheduler;\n\n\n/** A viewport that virtualizes its scrolling with the help of `CdkVirtualForOf`. */\n@Component({\n  selector: 'cdk-virtual-scroll-viewport',\n  templateUrl: 'virtual-scroll-viewport.html',\n  styleUrls: ['virtual-scroll-viewport.css'],\n  host: {\n    'class': 'cdk-virtual-scroll-viewport',\n    '[class.cdk-virtual-scroll-orientation-horizontal]': 'orientation === \"horizontal\"',\n    '[class.cdk-virtual-scroll-orientation-vertical]': 'orientation !== \"horizontal\"',\n  },\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  providers: [{\n    provide: CdkScrollable,\n    useExisting: CdkVirtualScrollViewport,\n  }]\n})\nexport class CdkVirtualScrollViewport extends CdkScrollable implements OnInit, OnDestroy {\n  /** Emits when the viewport is detached from a CdkVirtualForOf. */\n  private readonly _detachedSubject = new Subject<void>();\n\n  /** Emits when the rendered range changes. */\n  private readonly _renderedRangeSubject = new Subject<ListRange>();\n\n  /** The direction the viewport scrolls. */\n  @Input()\n  get orientation() {\n    return this._orientation;\n  }\n  set orientation(orientation: 'horizontal' | 'vertical') {\n    if (this._orientation !== orientation) {\n      this._orientation = orientation;\n      this._calculateSpacerSize();\n    }\n  }\n  private _orientation: 'horizontal' | 'vertical' = 'vertical';\n\n  /**\n   * Whether rendered items should persist in the DOM after scrolling out of view. By default, items\n   * will be removed.\n   */\n  @Input()\n  get appendOnly(): boolean {\n    return this._appendOnly;\n  }\n  set appendOnly(value: boolean) {\n    this._appendOnly = coerceBooleanProperty(value);\n  }\n  private _appendOnly = false;\n\n  // Note: we don't use the typical EventEmitter here because we need to subscribe to the scroll\n  // strategy lazily (i.e. only if the user is actually listening to the events). We do this because\n  // depending on how the strategy calculates the scrolled index, it may come at a cost to\n  // performance.\n  /** Emits when the index of the first element visible in the viewport changes. */\n  @Output()\n  readonly scrolledIndexChange: Observable<number> = new Observable(\n      (observer: Observer<number>) => this._scrollStrategy.scrolledIndexChange.subscribe(\n          index => Promise.resolve().then(() => this.ngZone.run(() => observer.next(index)))));\n\n  /** The element that wraps the rendered content. */\n  @ViewChild('contentWrapper', {static: true}) _contentWrapper: ElementRef<HTMLElement>;\n\n  /** A stream that emits whenever the rendered range changes. */\n  readonly renderedRangeStream: Observable<ListRange> = this._renderedRangeSubject;\n\n  /**\n   * The total size of all content (in pixels), including content that is not currently rendered.\n   */\n  private _totalContentSize = 0;\n\n  /** A string representing the `style.width` property value to be used for the spacer element. */\n  _totalContentWidth = '';\n\n  /** A string representing the `style.height` property value to be used for the spacer element. */\n  _totalContentHeight = '';\n\n  /**\n   * The CSS transform applied to the rendered subset of items so that they appear within the bounds\n   * of the visible viewport.\n   */\n  private _renderedContentTransform: string;\n\n  /** The currently rendered range of indices. */\n  private _renderedRange: ListRange = {start: 0, end: 0};\n\n  /** The length of the data bound to this viewport (in number of items). */\n  private _dataLength = 0;\n\n  /** The size of the viewport (in pixels). */\n  private _viewportSize = 0;\n\n  /** the currently attached CdkVirtualScrollRepeater. */\n  private _forOf: CdkVirtualScrollRepeater<any> | null;\n\n  /** The last rendered content offset that was set. */\n  private _renderedContentOffset = 0;\n\n  /**\n   * Whether the last rendered content offset was to the end of the content (and therefore needs to\n   * be rewritten as an offset to the start of the content).\n   */\n  private _renderedContentOffsetNeedsRewrite = false;\n\n  /** Whether there is a pending change detection cycle. */\n  private _isChangeDetectionPending = false;\n\n  /** A list of functions to run after the next change detection cycle. */\n  private _runAfterChangeDetection: Function[] = [];\n\n  /** Subscription to changes in the viewport size. */\n  private _viewportChanges = Subscription.EMPTY;\n\n  constructor(public override elementRef: ElementRef<HTMLElement>,\n              private _changeDetectorRef: ChangeDetectorRef,\n              ngZone: NgZone,\n              @Optional() @Inject(VIRTUAL_SCROLL_STRATEGY)\n                  private _scrollStrategy: VirtualScrollStrategy,\n              @Optional() dir: Directionality,\n              scrollDispatcher: ScrollDispatcher,\n              viewportRuler: ViewportRuler) {\n    super(elementRef, scrollDispatcher, ngZone, dir);\n\n    if (!_scrollStrategy && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('Error: cdk-virtual-scroll-viewport requires the \"itemSize\" property to be set.');\n    }\n\n    this._viewportChanges = viewportRuler.change().subscribe(() => {\n      this.checkViewportSize();\n    });\n  }\n\n  override ngOnInit() {\n    super.ngOnInit();\n\n    // It's still too early to measure the viewport at this point. Deferring with a promise allows\n    // the Viewport to be rendered with the correct size before we measure. We run this outside the\n    // zone to avoid causing more change detection cycles. We handle the change detection loop\n    // ourselves instead.\n    this.ngZone.runOutsideAngular(() => Promise.resolve().then(() => {\n      this._measureViewportSize();\n      this._scrollStrategy.attach(this);\n\n      this.elementScrolled()\n          .pipe(\n              // Start off with a fake scroll event so we properly detect our initial position.\n              startWith(null),\n              // Collect multiple events into one until the next animation frame. This way if\n              // there are multiple scroll events in the same frame we only need to recheck\n              // our layout once.\n              auditTime(0, SCROLL_SCHEDULER))\n          .subscribe(() => this._scrollStrategy.onContentScrolled());\n\n      this._markChangeDetectionNeeded();\n    }));\n  }\n\n  override ngOnDestroy() {\n    this.detach();\n    this._scrollStrategy.detach();\n\n    // Complete all subjects\n    this._renderedRangeSubject.complete();\n    this._detachedSubject.complete();\n    this._viewportChanges.unsubscribe();\n\n    super.ngOnDestroy();\n  }\n\n  /** Attaches a `CdkVirtualScrollRepeater` to this viewport. */\n  attach(forOf: CdkVirtualScrollRepeater<any>) {\n    if (this._forOf && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('CdkVirtualScrollViewport is already attached.');\n    }\n\n    // Subscribe to the data stream of the CdkVirtualForOf to keep track of when the data length\n    // changes. Run outside the zone to avoid triggering change detection, since we're managing the\n    // change detection loop ourselves.\n    this.ngZone.runOutsideAngular(() => {\n      this._forOf = forOf;\n      this._forOf.dataStream.pipe(takeUntil(this._detachedSubject)).subscribe(data => {\n        const newLength = data.length;\n        if (newLength !== this._dataLength) {\n          this._dataLength = newLength;\n          this._scrollStrategy.onDataLengthChanged();\n        }\n        this._doChangeDetection();\n      });\n    });\n  }\n\n  /** Detaches the current `CdkVirtualForOf`. */\n  detach() {\n    this._forOf = null;\n    this._detachedSubject.next();\n  }\n\n  /** Gets the length of the data bound to this viewport (in number of items). */\n  getDataLength(): number {\n    return this._dataLength;\n  }\n\n  /** Gets the size of the viewport (in pixels). */\n  getViewportSize(): number {\n    return this._viewportSize;\n  }\n\n  // TODO(mmalerba): This is technically out of sync with what's really rendered until a render\n  // cycle happens. I'm being careful to only call it after the render cycle is complete and before\n  // setting it to something else, but its error prone and should probably be split into\n  // `pendingRange` and `renderedRange`, the latter reflecting whats actually in the DOM.\n\n  /** Get the current rendered range of items. */\n  getRenderedRange(): ListRange {\n    return this._renderedRange;\n  }\n\n  /**\n   * Sets the total size of all content (in pixels), including content that is not currently\n   * rendered.\n   */\n  setTotalContentSize(size: number) {\n    if (this._totalContentSize !== size) {\n      this._totalContentSize = size;\n      this._calculateSpacerSize();\n      this._markChangeDetectionNeeded();\n    }\n  }\n\n  /** Sets the currently rendered range of indices. */\n  setRenderedRange(range: ListRange) {\n    if (!rangesEqual(this._renderedRange, range)) {\n      if (this.appendOnly) {\n        range = {start: 0, end: Math.max(this._renderedRange.end, range.end)};\n      }\n      this._renderedRangeSubject.next(this._renderedRange = range);\n      this._markChangeDetectionNeeded(() => this._scrollStrategy.onContentRendered());\n    }\n  }\n\n  /**\n   * Gets the offset from the start of the viewport to the start of the rendered data (in pixels).\n   */\n  getOffsetToRenderedContentStart(): number | null {\n    return this._renderedContentOffsetNeedsRewrite ? null : this._renderedContentOffset;\n  }\n\n  /**\n   * Sets the offset from the start of the viewport to either the start or end of the rendered data\n   * (in pixels).\n   */\n  setRenderedContentOffset(offset: number, to: 'to-start' | 'to-end' = 'to-start') {\n    // For a horizontal viewport in a right-to-left language we need to translate along the x-axis\n    // in the negative direction.\n    const isRtl = this.dir && this.dir.value == 'rtl';\n    const isHorizontal = this.orientation == 'horizontal';\n    const axis = isHorizontal ? 'X' : 'Y';\n    const axisDirection = isHorizontal && isRtl ? -1 : 1;\n    let transform = `translate${axis}(${Number(axisDirection * offset)}px)`;\n    this._renderedContentOffset = offset;\n    if (to === 'to-end') {\n      transform += ` translate${axis}(-100%)`;\n      // The viewport should rewrite this as a `to-start` offset on the next render cycle. Otherwise\n      // elements will appear to expand in the wrong direction (e.g. `mat-expansion-panel` would\n      // expand upward).\n      this._renderedContentOffsetNeedsRewrite = true;\n    }\n    if (this._renderedContentTransform != transform) {\n      // We know this value is safe because we parse `offset` with `Number()` before passing it\n      // into the string.\n      this._renderedContentTransform = transform;\n      this._markChangeDetectionNeeded(() => {\n        if (this._renderedContentOffsetNeedsRewrite) {\n          this._renderedContentOffset -= this.measureRenderedContentSize();\n          this._renderedContentOffsetNeedsRewrite = false;\n          this.setRenderedContentOffset(this._renderedContentOffset);\n        } else {\n          this._scrollStrategy.onRenderedOffsetChanged();\n        }\n      });\n    }\n  }\n\n  /**\n   * Scrolls to the given offset from the start of the viewport. Please note that this is not always\n   * the same as setting `scrollTop` or `scrollLeft`. In a horizontal viewport with right-to-left\n   * direction, this would be the equivalent of setting a fictional `scrollRight` property.\n   * @param offset The offset to scroll to.\n   * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`.\n   */\n  scrollToOffset(offset: number, behavior: ScrollBehavior = 'auto') {\n    const options: ExtendedScrollToOptions = {behavior};\n    if (this.orientation === 'horizontal') {\n      options.start = offset;\n    } else {\n      options.top = offset;\n    }\n    this.scrollTo(options);\n  }\n\n  /**\n   * Scrolls to the offset for the given index.\n   * @param index The index of the element to scroll to.\n   * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`.\n   */\n  scrollToIndex(index: number,  behavior: ScrollBehavior = 'auto') {\n    this._scrollStrategy.scrollToIndex(index, behavior);\n  }\n\n  /**\n   * Gets the current scroll offset from the start of the viewport (in pixels).\n   * @param from The edge to measure the offset from. Defaults to 'top' in vertical mode and 'start'\n   *     in horizontal mode.\n   */\n  override measureScrollOffset(\n      from?: 'top' | 'left' | 'right' | 'bottom' | 'start' | 'end'): number {\n    return from ?\n      super.measureScrollOffset(from) :\n      super.measureScrollOffset(this.orientation === 'horizontal' ? 'start' : 'top');\n  }\n\n  /** Measure the combined size of all of the rendered items. */\n  measureRenderedContentSize(): number {\n    const contentEl = this._contentWrapper.nativeElement;\n    return this.orientation === 'horizontal' ? contentEl.offsetWidth : contentEl.offsetHeight;\n  }\n\n  /**\n   * Measure the total combined size of the given range. Throws if the range includes items that are\n   * not rendered.\n   */\n  measureRangeSize(range: ListRange): number {\n    if (!this._forOf) {\n      return 0;\n    }\n    return this._forOf.measureRangeSize(range, this.orientation);\n  }\n\n  /** Update the viewport dimensions and re-render. */\n  checkViewportSize() {\n    // TODO: Cleanup later when add logic for handling content resize\n    this._measureViewportSize();\n    this._scrollStrategy.onDataLengthChanged();\n  }\n\n  /** Measure the viewport size. */\n  private _measureViewportSize() {\n    const viewportEl = this.elementRef.nativeElement;\n    this._viewportSize = this.orientation === 'horizontal' ?\n        viewportEl.clientWidth : viewportEl.clientHeight;\n  }\n\n  /** Queue up change detection to run. */\n  private _markChangeDetectionNeeded(runAfter?: Function) {\n    if (runAfter) {\n      this._runAfterChangeDetection.push(runAfter);\n    }\n\n    // Use a Promise to batch together calls to `_doChangeDetection`. This way if we set a bunch of\n    // properties sequentially we only have to run `_doChangeDetection` once at the end.\n    if (!this._isChangeDetectionPending) {\n      this._isChangeDetectionPending = true;\n      this.ngZone.runOutsideAngular(() => Promise.resolve().then(() => {\n        this._doChangeDetection();\n      }));\n    }\n  }\n\n  /** Run change detection. */\n  private _doChangeDetection() {\n    this._isChangeDetectionPending = false;\n\n    // Apply the content transform. The transform can't be set via an Angular binding because\n    // bypassSecurityTrustStyle is banned in Google. However the value is safe, it's composed of\n    // string literals, a variable that can only be 'X' or 'Y', and user input that is run through\n    // the `Number` function first to coerce it to a numeric value.\n    this._contentWrapper.nativeElement.style.transform = this._renderedContentTransform;\n    // Apply changes to Angular bindings. Note: We must call `markForCheck` to run change detection\n    // from the root, since the repeated items are content projected in. Calling `detectChanges`\n    // instead does not properly check the projected content.\n    this.ngZone.run(() => this._changeDetectorRef.markForCheck());\n\n    const runAfterChangeDetection = this._runAfterChangeDetection;\n    this._runAfterChangeDetection = [];\n    for (const fn of runAfterChangeDetection) {\n      fn();\n    }\n  }\n\n  /** Calculates the `style.width` and `style.height` for the spacer element. */\n  private _calculateSpacerSize() {\n    this._totalContentHeight =\n        this.orientation === 'horizontal' ? '' : `${this._totalContentSize}px`;\n    this._totalContentWidth =\n        this.orientation === 'horizontal' ? `${this._totalContentSize}px` : '';\n  }\n\n  static ngAcceptInputType_appendOnly: BooleanInput;\n}\n"]}