@angular/cdk
Version:
Angular Material Component Development Kit
355 lines • 54.2 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 { 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';
/** 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';
// 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();
}
}
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)) {
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 Wrap the rendered content in an element that will be used to offset it based on the scroll\n position.\n-->\n<div #contentWrapper class=\"cdk-virtual-scroll-content-wrapper\">\n <ng-content></ng-content>\n</div>\n<!--\n Spacer used to force the scrolling container to the correct size for the *total* number of items\n so that the scrollbar captures the size of the entire data set.\n-->\n<div class=\"cdk-virtual-scroll-spacer\"\n [style.width]=\"_totalContentWidth\" [style.height]=\"_totalContentHeight\"></div>\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 }],
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';\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 _detachedSubject = new Subject<void>();\n\n  /** Emits when the rendered range changes. */\n  private _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  // 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() scrolledIndexChange: Observable<number> =\n      new Observable((observer: Observer<number>) =>\n        this._scrollStrategy.scrolledIndexChange.subscribe(index =>\n            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  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 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  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  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      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  measureScrollOffset(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  /*