| /** |
| * @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  /** 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"]} |
