source: trip-planner-front/node_modules/@angular/cdk/esm2015/scrolling/virtual-scroll-viewport.js

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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8import { Directionality } from '@angular/cdk/bidi';
9import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ElementRef, Inject, Input, NgZone, Optional, Output, ViewChild, ViewEncapsulation, } from '@angular/core';
10import { animationFrameScheduler, asapScheduler, Observable, Subject, Subscription, } from 'rxjs';
11import { auditTime, startWith, takeUntil } from 'rxjs/operators';
12import { ScrollDispatcher } from './scroll-dispatcher';
13import { CdkScrollable } from './scrollable';
14import { VIRTUAL_SCROLL_STRATEGY } from './virtual-scroll-strategy';
15import { ViewportRuler } from './viewport-ruler';
16import { coerceBooleanProperty } from '@angular/cdk/coercion';
17/** Checks if the given ranges are equal. */
18function rangesEqual(r1, r2) {
19 return r1.start == r2.start && r1.end == r2.end;
20}
21/**
22 * Scheduler to be used for scroll events. Needs to fall back to
23 * something that doesn't rely on requestAnimationFrame on environments
24 * that don't support it (e.g. server-side rendering).
25 */
26const SCROLL_SCHEDULER = typeof requestAnimationFrame !== 'undefined' ? animationFrameScheduler : asapScheduler;
27/** A viewport that virtualizes its scrolling with the help of `CdkVirtualForOf`. */
28export class CdkVirtualScrollViewport extends CdkScrollable {
29 constructor(elementRef, _changeDetectorRef, ngZone, _scrollStrategy, dir, scrollDispatcher, viewportRuler) {
30 super(elementRef, scrollDispatcher, ngZone, dir);
31 this.elementRef = elementRef;
32 this._changeDetectorRef = _changeDetectorRef;
33 this._scrollStrategy = _scrollStrategy;
34 /** Emits when the viewport is detached from a CdkVirtualForOf. */
35 this._detachedSubject = new Subject();
36 /** Emits when the rendered range changes. */
37 this._renderedRangeSubject = new Subject();
38 this._orientation = 'vertical';
39 this._appendOnly = false;
40 // Note: we don't use the typical EventEmitter here because we need to subscribe to the scroll
41 // strategy lazily (i.e. only if the user is actually listening to the events). We do this because
42 // depending on how the strategy calculates the scrolled index, it may come at a cost to
43 // performance.
44 /** Emits when the index of the first element visible in the viewport changes. */
45 this.scrolledIndexChange = new Observable((observer) => this._scrollStrategy.scrolledIndexChange.subscribe(index => Promise.resolve().then(() => this.ngZone.run(() => observer.next(index)))));
46 /** A stream that emits whenever the rendered range changes. */
47 this.renderedRangeStream = this._renderedRangeSubject;
48 /**
49 * The total size of all content (in pixels), including content that is not currently rendered.
50 */
51 this._totalContentSize = 0;
52 /** A string representing the `style.width` property value to be used for the spacer element. */
53 this._totalContentWidth = '';
54 /** A string representing the `style.height` property value to be used for the spacer element. */
55 this._totalContentHeight = '';
56 /** The currently rendered range of indices. */
57 this._renderedRange = { start: 0, end: 0 };
58 /** The length of the data bound to this viewport (in number of items). */
59 this._dataLength = 0;
60 /** The size of the viewport (in pixels). */
61 this._viewportSize = 0;
62 /** The last rendered content offset that was set. */
63 this._renderedContentOffset = 0;
64 /**
65 * Whether the last rendered content offset was to the end of the content (and therefore needs to
66 * be rewritten as an offset to the start of the content).
67 */
68 this._renderedContentOffsetNeedsRewrite = false;
69 /** Whether there is a pending change detection cycle. */
70 this._isChangeDetectionPending = false;
71 /** A list of functions to run after the next change detection cycle. */
72 this._runAfterChangeDetection = [];
73 /** Subscription to changes in the viewport size. */
74 this._viewportChanges = Subscription.EMPTY;
75 if (!_scrollStrategy && (typeof ngDevMode === 'undefined' || ngDevMode)) {
76 throw Error('Error: cdk-virtual-scroll-viewport requires the "itemSize" property to be set.');
77 }
78 this._viewportChanges = viewportRuler.change().subscribe(() => {
79 this.checkViewportSize();
80 });
81 }
82 /** The direction the viewport scrolls. */
83 get orientation() {
84 return this._orientation;
85 }
86 set orientation(orientation) {
87 if (this._orientation !== orientation) {
88 this._orientation = orientation;
89 this._calculateSpacerSize();
90 }
91 }
92 /**
93 * Whether rendered items should persist in the DOM after scrolling out of view. By default, items
94 * will be removed.
95 */
96 get appendOnly() {
97 return this._appendOnly;
98 }
99 set appendOnly(value) {
100 this._appendOnly = coerceBooleanProperty(value);
101 }
102 ngOnInit() {
103 super.ngOnInit();
104 // It's still too early to measure the viewport at this point. Deferring with a promise allows
105 // the Viewport to be rendered with the correct size before we measure. We run this outside the
106 // zone to avoid causing more change detection cycles. We handle the change detection loop
107 // ourselves instead.
108 this.ngZone.runOutsideAngular(() => Promise.resolve().then(() => {
109 this._measureViewportSize();
110 this._scrollStrategy.attach(this);
111 this.elementScrolled()
112 .pipe(
113 // Start off with a fake scroll event so we properly detect our initial position.
114 startWith(null),
115 // Collect multiple events into one until the next animation frame. This way if
116 // there are multiple scroll events in the same frame we only need to recheck
117 // our layout once.
118 auditTime(0, SCROLL_SCHEDULER))
119 .subscribe(() => this._scrollStrategy.onContentScrolled());
120 this._markChangeDetectionNeeded();
121 }));
122 }
123 ngOnDestroy() {
124 this.detach();
125 this._scrollStrategy.detach();
126 // Complete all subjects
127 this._renderedRangeSubject.complete();
128 this._detachedSubject.complete();
129 this._viewportChanges.unsubscribe();
130 super.ngOnDestroy();
131 }
132 /** Attaches a `CdkVirtualScrollRepeater` to this viewport. */
133 attach(forOf) {
134 if (this._forOf && (typeof ngDevMode === 'undefined' || ngDevMode)) {
135 throw Error('CdkVirtualScrollViewport is already attached.');
136 }
137 // Subscribe to the data stream of the CdkVirtualForOf to keep track of when the data length
138 // changes. Run outside the zone to avoid triggering change detection, since we're managing the
139 // change detection loop ourselves.
140 this.ngZone.runOutsideAngular(() => {
141 this._forOf = forOf;
142 this._forOf.dataStream.pipe(takeUntil(this._detachedSubject)).subscribe(data => {
143 const newLength = data.length;
144 if (newLength !== this._dataLength) {
145 this._dataLength = newLength;
146 this._scrollStrategy.onDataLengthChanged();
147 }
148 this._doChangeDetection();
149 });
150 });
151 }
152 /** Detaches the current `CdkVirtualForOf`. */
153 detach() {
154 this._forOf = null;
155 this._detachedSubject.next();
156 }
157 /** Gets the length of the data bound to this viewport (in number of items). */
158 getDataLength() {
159 return this._dataLength;
160 }
161 /** Gets the size of the viewport (in pixels). */
162 getViewportSize() {
163 return this._viewportSize;
164 }
165 // TODO(mmalerba): This is technically out of sync with what's really rendered until a render
166 // cycle happens. I'm being careful to only call it after the render cycle is complete and before
167 // setting it to something else, but its error prone and should probably be split into
168 // `pendingRange` and `renderedRange`, the latter reflecting whats actually in the DOM.
169 /** Get the current rendered range of items. */
170 getRenderedRange() {
171 return this._renderedRange;
172 }
173 /**
174 * Sets the total size of all content (in pixels), including content that is not currently
175 * rendered.
176 */
177 setTotalContentSize(size) {
178 if (this._totalContentSize !== size) {
179 this._totalContentSize = size;
180 this._calculateSpacerSize();
181 this._markChangeDetectionNeeded();
182 }
183 }
184 /** Sets the currently rendered range of indices. */
185 setRenderedRange(range) {
186 if (!rangesEqual(this._renderedRange, range)) {
187 if (this.appendOnly) {
188 range = { start: 0, end: Math.max(this._renderedRange.end, range.end) };
189 }
190 this._renderedRangeSubject.next(this._renderedRange = range);
191 this._markChangeDetectionNeeded(() => this._scrollStrategy.onContentRendered());
192 }
193 }
194 /**
195 * Gets the offset from the start of the viewport to the start of the rendered data (in pixels).
196 */
197 getOffsetToRenderedContentStart() {
198 return this._renderedContentOffsetNeedsRewrite ? null : this._renderedContentOffset;
199 }
200 /**
201 * Sets the offset from the start of the viewport to either the start or end of the rendered data
202 * (in pixels).
203 */
204 setRenderedContentOffset(offset, to = 'to-start') {
205 // For a horizontal viewport in a right-to-left language we need to translate along the x-axis
206 // in the negative direction.
207 const isRtl = this.dir && this.dir.value == 'rtl';
208 const isHorizontal = this.orientation == 'horizontal';
209 const axis = isHorizontal ? 'X' : 'Y';
210 const axisDirection = isHorizontal && isRtl ? -1 : 1;
211 let transform = `translate${axis}(${Number(axisDirection * offset)}px)`;
212 this._renderedContentOffset = offset;
213 if (to === 'to-end') {
214 transform += ` translate${axis}(-100%)`;
215 // The viewport should rewrite this as a `to-start` offset on the next render cycle. Otherwise
216 // elements will appear to expand in the wrong direction (e.g. `mat-expansion-panel` would
217 // expand upward).
218 this._renderedContentOffsetNeedsRewrite = true;
219 }
220 if (this._renderedContentTransform != transform) {
221 // We know this value is safe because we parse `offset` with `Number()` before passing it
222 // into the string.
223 this._renderedContentTransform = transform;
224 this._markChangeDetectionNeeded(() => {
225 if (this._renderedContentOffsetNeedsRewrite) {
226 this._renderedContentOffset -= this.measureRenderedContentSize();
227 this._renderedContentOffsetNeedsRewrite = false;
228 this.setRenderedContentOffset(this._renderedContentOffset);
229 }
230 else {
231 this._scrollStrategy.onRenderedOffsetChanged();
232 }
233 });
234 }
235 }
236 /**
237 * Scrolls to the given offset from the start of the viewport. Please note that this is not always
238 * the same as setting `scrollTop` or `scrollLeft`. In a horizontal viewport with right-to-left
239 * direction, this would be the equivalent of setting a fictional `scrollRight` property.
240 * @param offset The offset to scroll to.
241 * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`.
242 */
243 scrollToOffset(offset, behavior = 'auto') {
244 const options = { behavior };
245 if (this.orientation === 'horizontal') {
246 options.start = offset;
247 }
248 else {
249 options.top = offset;
250 }
251 this.scrollTo(options);
252 }
253 /**
254 * Scrolls to the offset for the given index.
255 * @param index The index of the element to scroll to.
256 * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`.
257 */
258 scrollToIndex(index, behavior = 'auto') {
259 this._scrollStrategy.scrollToIndex(index, behavior);
260 }
261 /**
262 * Gets the current scroll offset from the start of the viewport (in pixels).
263 * @param from The edge to measure the offset from. Defaults to 'top' in vertical mode and 'start'
264 * in horizontal mode.
265 */
266 measureScrollOffset(from) {
267 return from ?
268 super.measureScrollOffset(from) :
269 super.measureScrollOffset(this.orientation === 'horizontal' ? 'start' : 'top');
270 }
271 /** Measure the combined size of all of the rendered items. */
272 measureRenderedContentSize() {
273 const contentEl = this._contentWrapper.nativeElement;
274 return this.orientation === 'horizontal' ? contentEl.offsetWidth : contentEl.offsetHeight;
275 }
276 /**
277 * Measure the total combined size of the given range. Throws if the range includes items that are
278 * not rendered.
279 */
280 measureRangeSize(range) {
281 if (!this._forOf) {
282 return 0;
283 }
284 return this._forOf.measureRangeSize(range, this.orientation);
285 }
286 /** Update the viewport dimensions and re-render. */
287 checkViewportSize() {
288 // TODO: Cleanup later when add logic for handling content resize
289 this._measureViewportSize();
290 this._scrollStrategy.onDataLengthChanged();
291 }
292 /** Measure the viewport size. */
293 _measureViewportSize() {
294 const viewportEl = this.elementRef.nativeElement;
295 this._viewportSize = this.orientation === 'horizontal' ?
296 viewportEl.clientWidth : viewportEl.clientHeight;
297 }
298 /** Queue up change detection to run. */
299 _markChangeDetectionNeeded(runAfter) {
300 if (runAfter) {
301 this._runAfterChangeDetection.push(runAfter);
302 }
303 // Use a Promise to batch together calls to `_doChangeDetection`. This way if we set a bunch of
304 // properties sequentially we only have to run `_doChangeDetection` once at the end.
305 if (!this._isChangeDetectionPending) {
306 this._isChangeDetectionPending = true;
307 this.ngZone.runOutsideAngular(() => Promise.resolve().then(() => {
308 this._doChangeDetection();
309 }));
310 }
311 }
312 /** Run change detection. */
313 _doChangeDetection() {
314 this._isChangeDetectionPending = false;
315 // Apply the content transform. The transform can't be set via an Angular binding because
316 // bypassSecurityTrustStyle is banned in Google. However the value is safe, it's composed of
317 // string literals, a variable that can only be 'X' or 'Y', and user input that is run through
318 // the `Number` function first to coerce it to a numeric value.
319 this._contentWrapper.nativeElement.style.transform = this._renderedContentTransform;
320 // Apply changes to Angular bindings. Note: We must call `markForCheck` to run change detection
321 // from the root, since the repeated items are content projected in. Calling `detectChanges`
322 // instead does not properly check the projected content.
323 this.ngZone.run(() => this._changeDetectorRef.markForCheck());
324 const runAfterChangeDetection = this._runAfterChangeDetection;
325 this._runAfterChangeDetection = [];
326 for (const fn of runAfterChangeDetection) {
327 fn();
328 }
329 }
330 /** Calculates the `style.width` and `style.height` for the spacer element. */
331 _calculateSpacerSize() {
332 this._totalContentHeight =
333 this.orientation === 'horizontal' ? '' : `${this._totalContentSize}px`;
334 this._totalContentWidth =
335 this.orientation === 'horizontal' ? `${this._totalContentSize}px` : '';
336 }
337}
338CdkVirtualScrollViewport.decorators = [
339 { type: Component, args: [{
340 selector: 'cdk-virtual-scroll-viewport',
341 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",
342 host: {
343 'class': 'cdk-virtual-scroll-viewport',
344 '[class.cdk-virtual-scroll-orientation-horizontal]': 'orientation === "horizontal"',
345 '[class.cdk-virtual-scroll-orientation-vertical]': 'orientation !== "horizontal"',
346 },
347 encapsulation: ViewEncapsulation.None,
348 changeDetection: ChangeDetectionStrategy.OnPush,
349 providers: [{
350 provide: CdkScrollable,
351 useExisting: CdkVirtualScrollViewport,
352 }],
353 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"]
354 },] }
355];
356CdkVirtualScrollViewport.ctorParameters = () => [
357 { type: ElementRef },
358 { type: ChangeDetectorRef },
359 { type: NgZone },
360 { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [VIRTUAL_SCROLL_STRATEGY,] }] },
361 { type: Directionality, decorators: [{ type: Optional }] },
362 { type: ScrollDispatcher },
363 { type: ViewportRuler }
364];
365CdkVirtualScrollViewport.propDecorators = {
366 orientation: [{ type: Input }],
367 appendOnly: [{ type: Input }],
368 scrolledIndexChange: [{ type: Output }],
369 _contentWrapper: [{ type: ViewChild, args: ['contentWrapper', { static: true },] }]
370};
371//# 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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"]}
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