{"version":3,"sources":["node_modules/@angular/cdk/fesm2022/data-source-5320b6fd.mjs","node_modules/@angular/cdk/fesm2022/recycle-view-repeater-strategy-c1712813.mjs","node_modules/@angular/cdk/fesm2022/scrolling-module-aa1faac1.mjs"],"sourcesContent":["import { ConnectableObservable } from 'rxjs';\nclass DataSource {}\n/** Checks whether an object is a data source. */\nfunction isDataSource(value) {\n  // Check if the value is a DataSource by observing if it has a connect function. Cannot\n  // be checked as an `instanceof DataSource` since people could create their own sources\n  // that match the interface, but don't extend DataSource. We also can't use `isObservable`\n  // here, because of some internal apps.\n  return value && typeof value.connect === 'function' && !(value instanceof ConnectableObservable);\n}\nexport { DataSource as D, isDataSource as i };\n","import { isObservable, of } from 'rxjs';\nimport { D as DataSource } from './data-source-5320b6fd.mjs';\nimport { InjectionToken } from '@angular/core';\n\n/** DataSource wrapper for a native array. */\nclass ArrayDataSource extends DataSource {\n  _data;\n  constructor(_data) {\n    super();\n    this._data = _data;\n  }\n  connect() {\n    return isObservable(this._data) ? this._data : of(this._data);\n  }\n  disconnect() {}\n}\n\n/** Indicates how a view was changed by a {@link _ViewRepeater}. */\nvar _ViewRepeaterOperation = /*#__PURE__*/function (_ViewRepeaterOperation) {\n  /** The content of an existing view was replaced with another item. */\n  _ViewRepeaterOperation[_ViewRepeaterOperation[\"REPLACED\"] = 0] = \"REPLACED\";\n  /** A new view was created with `createEmbeddedView`. */\n  _ViewRepeaterOperation[_ViewRepeaterOperation[\"INSERTED\"] = 1] = \"INSERTED\";\n  /** The position of a view changed, but the content remains the same. */\n  _ViewRepeaterOperation[_ViewRepeaterOperation[\"MOVED\"] = 2] = \"MOVED\";\n  /** A view was detached from the view container. */\n  _ViewRepeaterOperation[_ViewRepeaterOperation[\"REMOVED\"] = 3] = \"REMOVED\";\n  return _ViewRepeaterOperation;\n}(_ViewRepeaterOperation || {});\n/**\n * Injection token for {@link _ViewRepeater}. This token is for use by Angular Material only.\n * @docs-private\n */\nconst _VIEW_REPEATER_STRATEGY = /*#__PURE__*/new InjectionToken('_ViewRepeater');\n\n/**\n * A repeater that caches views when they are removed from a\n * {@link ViewContainerRef}. When new items are inserted into the container,\n * the repeater will reuse one of the cached views instead of creating a new\n * embedded view. Recycling cached views reduces the quantity of expensive DOM\n * inserts.\n *\n * @template T The type for the embedded view's $implicit property.\n * @template R The type for the item in each IterableDiffer change record.\n * @template C The type for the context passed to each embedded view.\n */\nclass _RecycleViewRepeaterStrategy {\n  /**\n   * The size of the cache used to store unused views.\n   * Setting the cache size to `0` will disable caching. Defaults to 20 views.\n   */\n  viewCacheSize = 20;\n  /**\n   * View cache that stores embedded view instances that have been previously stamped out,\n   * but don't are not currently rendered. The view repeater will reuse these views rather than\n   * creating brand new ones.\n   *\n   * TODO(michaeljamesparsons) Investigate whether using a linked list would improve performance.\n   */\n  _viewCache = [];\n  /** Apply changes to the DOM. */\n  applyChanges(changes, viewContainerRef, itemContextFactory, itemValueResolver, itemViewChanged) {\n    // Rearrange the views to put them in the right location.\n    changes.forEachOperation((record, adjustedPreviousIndex, currentIndex) => {\n      let view;\n      let operation;\n      if (record.previousIndex == null) {\n        // Item added.\n        const viewArgsFactory = () => itemContextFactory(record, adjustedPreviousIndex, currentIndex);\n        view = this._insertView(viewArgsFactory, currentIndex, viewContainerRef, itemValueResolver(record));\n        operation = view ? _ViewRepeaterOperation.INSERTED : _ViewRepeaterOperation.REPLACED;\n      } else if (currentIndex == null) {\n        // Item removed.\n        this._detachAndCacheView(adjustedPreviousIndex, viewContainerRef);\n        operation = _ViewRepeaterOperation.REMOVED;\n      } else {\n        // Item moved.\n        view = this._moveView(adjustedPreviousIndex, currentIndex, viewContainerRef, itemValueResolver(record));\n        operation = _ViewRepeaterOperation.MOVED;\n      }\n      if (itemViewChanged) {\n        itemViewChanged({\n          context: view?.context,\n          operation,\n          record\n        });\n      }\n    });\n  }\n  detach() {\n    for (const view of this._viewCache) {\n      view.destroy();\n    }\n    this._viewCache = [];\n  }\n  /**\n   * Inserts a view for a new item, either from the cache or by creating a new\n   * one. Returns `undefined` if the item was inserted into a cached view.\n   */\n  _insertView(viewArgsFactory, currentIndex, viewContainerRef, value) {\n    const cachedView = this._insertViewFromCache(currentIndex, viewContainerRef);\n    if (cachedView) {\n      cachedView.context.$implicit = value;\n      return undefined;\n    }\n    const viewArgs = viewArgsFactory();\n    return viewContainerRef.createEmbeddedView(viewArgs.templateRef, viewArgs.context, viewArgs.index);\n  }\n  /** Detaches the view at the given index and inserts into the view cache. */\n  _detachAndCacheView(index, viewContainerRef) {\n    const detachedView = viewContainerRef.detach(index);\n    this._maybeCacheView(detachedView, viewContainerRef);\n  }\n  /** Moves view at the previous index to the current index. */\n  _moveView(adjustedPreviousIndex, currentIndex, viewContainerRef, value) {\n    const view = viewContainerRef.get(adjustedPreviousIndex);\n    viewContainerRef.move(view, currentIndex);\n    view.context.$implicit = value;\n    return view;\n  }\n  /**\n   * Cache the given detached view. If the cache is full, the view will be\n   * destroyed.\n   */\n  _maybeCacheView(view, viewContainerRef) {\n    if (this._viewCache.length < this.viewCacheSize) {\n      this._viewCache.push(view);\n    } else {\n      const index = viewContainerRef.indexOf(view);\n      // The host component could remove views from the container outside of\n      // the view repeater. It's unlikely this will occur, but just in case,\n      // destroy the view on its own, otherwise destroy it through the\n      // container to ensure that all the references are removed.\n      if (index === -1) {\n        view.destroy();\n      } else {\n        viewContainerRef.remove(index);\n      }\n    }\n  }\n  /** Inserts a recycled view from the cache at the given index. */\n  _insertViewFromCache(index, viewContainerRef) {\n    const cachedView = this._viewCache.pop();\n    if (cachedView) {\n      viewContainerRef.insert(cachedView, index);\n    }\n    return cachedView || null;\n  }\n}\nexport { ArrayDataSource as A, _RecycleViewRepeaterStrategy as _, _ViewRepeaterOperation as a, _VIEW_REPEATER_STRATEGY as b };\n","import * as i0 from '@angular/core';\nimport { InjectionToken, forwardRef, Directive, Input, inject, NgZone, RendererFactory2, Injectable, ElementRef, Renderer2, ChangeDetectorRef, Injector, afterNextRender, booleanAttribute, Optional, Inject, Component, ViewEncapsulation, ChangeDetectionStrategy, Output, ViewChild, ViewContainerRef, TemplateRef, IterableDiffers, NgModule } from '@angular/core';\nimport { Subject, of, Observable, Subscription, animationFrameScheduler, asapScheduler, isObservable } from 'rxjs';\nimport { distinctUntilChanged, auditTime, filter, startWith, takeUntil, pairwise, switchMap, shareReplay } from 'rxjs/operators';\nimport { a as coerceNumberProperty, c as coerceElement } from './element-08c51fcd.mjs';\nimport { P as Platform } from './platform-610a08ae.mjs';\nimport { D as Directionality } from './directionality-0a678adc.mjs';\nimport { g as getRtlScrollAxisType, R as RtlScrollAxisType, s as supportsScrollBehavior } from './scrolling-61955dd1.mjs';\nimport { DOCUMENT } from '@angular/common';\nimport { b as _VIEW_REPEATER_STRATEGY, A as ArrayDataSource, _ as _RecycleViewRepeaterStrategy } from './recycle-view-repeater-strategy-c1712813.mjs';\nimport { i as isDataSource } from './data-source-5320b6fd.mjs';\nimport { B as BidiModule } from './bidi-module-56dd006c.mjs';\n\n/** The injection token used to specify the virtual scrolling strategy. */\nconst _c0 = [\"contentWrapper\"];\nconst _c1 = [\"*\"];\nconst VIRTUAL_SCROLL_STRATEGY = /*#__PURE__*/new InjectionToken('VIRTUAL_SCROLL_STRATEGY');\n\n/** Virtual scrolling strategy for lists with items of known fixed size. */\nclass FixedSizeVirtualScrollStrategy {\n  _scrolledIndexChange = /*#__PURE__*/new Subject();\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  scrolledIndexChange = /*#__PURE__*/this._scrolledIndexChange.pipe(/*#__PURE__*/distinctUntilChanged());\n  /** The attached viewport. */\n  _viewport = null;\n  /** The size of the items in the virtually scrolling list. */\n  _itemSize;\n  /** The minimum amount of buffer rendered beyond the viewport (in pixels). */\n  _minBufferPx;\n  /** The number of buffer items to render beyond the edge of the viewport (in pixels). */\n  _maxBufferPx;\n  /**\n   * @param itemSize The size of the items in the virtually scrolling list.\n   * @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more\n   * @param maxBufferPx The amount of buffer (in pixels) to render when rendering more.\n   */\n  constructor(itemSize, minBufferPx, maxBufferPx) {\n    this._itemSize = itemSize;\n    this._minBufferPx = minBufferPx;\n    this._maxBufferPx = maxBufferPx;\n  }\n  /**\n   * Attaches this scroll strategy to a viewport.\n   * @param viewport The viewport to attach this strategy to.\n   */\n  attach(viewport) {\n    this._viewport = viewport;\n    this._updateTotalContentSize();\n    this._updateRenderedRange();\n  }\n  /** Detaches this scroll strategy from the currently attached viewport. */\n  detach() {\n    this._scrolledIndexChange.complete();\n    this._viewport = null;\n  }\n  /**\n   * Update the item size and buffer size.\n   * @param itemSize The size of the items in the virtually scrolling list.\n   * @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more\n   * @param maxBufferPx The amount of buffer (in pixels) to render when rendering more.\n   */\n  updateItemAndBufferSize(itemSize, minBufferPx, maxBufferPx) {\n    if (maxBufferPx < minBufferPx && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('CDK virtual scroll: maxBufferPx must be greater than or equal to minBufferPx');\n    }\n    this._itemSize = itemSize;\n    this._minBufferPx = minBufferPx;\n    this._maxBufferPx = maxBufferPx;\n    this._updateTotalContentSize();\n    this._updateRenderedRange();\n  }\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onContentScrolled() {\n    this._updateRenderedRange();\n  }\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onDataLengthChanged() {\n    this._updateTotalContentSize();\n    this._updateRenderedRange();\n  }\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onContentRendered() {\n    /* no-op */\n  }\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onRenderedOffsetChanged() {\n    /* no-op */\n  }\n  /**\n   * Scroll 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.\n   */\n  scrollToIndex(index, behavior) {\n    if (this._viewport) {\n      this._viewport.scrollToOffset(index * this._itemSize, behavior);\n    }\n  }\n  /** Update the viewport's total content size. */\n  _updateTotalContentSize() {\n    if (!this._viewport) {\n      return;\n    }\n    this._viewport.setTotalContentSize(this._viewport.getDataLength() * this._itemSize);\n  }\n  /** Update the viewport's rendered range. */\n  _updateRenderedRange() {\n    if (!this._viewport) {\n      return;\n    }\n    const renderedRange = this._viewport.getRenderedRange();\n    const newRange = {\n      start: renderedRange.start,\n      end: renderedRange.end\n    };\n    const viewportSize = this._viewport.getViewportSize();\n    const dataLength = this._viewport.getDataLength();\n    let scrollOffset = this._viewport.measureScrollOffset();\n    // Prevent NaN as result when dividing by zero.\n    let firstVisibleIndex = this._itemSize > 0 ? scrollOffset / this._itemSize : 0;\n    // If user scrolls to the bottom of the list and data changes to a smaller list\n    if (newRange.end > dataLength) {\n      // We have to recalculate the first visible index based on new data length and viewport size.\n      const maxVisibleItems = Math.ceil(viewportSize / this._itemSize);\n      const newVisibleIndex = Math.max(0, Math.min(firstVisibleIndex, dataLength - maxVisibleItems));\n      // If first visible index changed we must update scroll offset to handle start/end buffers\n      // Current range must also be adjusted to cover the new position (bottom of new list).\n      if (firstVisibleIndex != newVisibleIndex) {\n        firstVisibleIndex = newVisibleIndex;\n        scrollOffset = newVisibleIndex * this._itemSize;\n        newRange.start = Math.floor(firstVisibleIndex);\n      }\n      newRange.end = Math.max(0, Math.min(dataLength, newRange.start + maxVisibleItems));\n    }\n    const startBuffer = scrollOffset - newRange.start * this._itemSize;\n    if (startBuffer < this._minBufferPx && newRange.start != 0) {\n      const expandStart = Math.ceil((this._maxBufferPx - startBuffer) / this._itemSize);\n      newRange.start = Math.max(0, newRange.start - expandStart);\n      newRange.end = Math.min(dataLength, Math.ceil(firstVisibleIndex + (viewportSize + this._minBufferPx) / this._itemSize));\n    } else {\n      const endBuffer = newRange.end * this._itemSize - (scrollOffset + viewportSize);\n      if (endBuffer < this._minBufferPx && newRange.end != dataLength) {\n        const expandEnd = Math.ceil((this._maxBufferPx - endBuffer) / this._itemSize);\n        if (expandEnd > 0) {\n          newRange.end = Math.min(dataLength, newRange.end + expandEnd);\n          newRange.start = Math.max(0, Math.floor(firstVisibleIndex - this._minBufferPx / this._itemSize));\n        }\n      }\n    }\n    this._viewport.setRenderedRange(newRange);\n    this._viewport.setRenderedContentOffset(this._itemSize * newRange.start);\n    this._scrolledIndexChange.next(Math.floor(firstVisibleIndex));\n  }\n}\n/**\n * Provider factory for `FixedSizeVirtualScrollStrategy` that simply extracts the already created\n * `FixedSizeVirtualScrollStrategy` from the given directive.\n * @param fixedSizeDir The instance of `CdkFixedSizeVirtualScroll` to extract the\n *     `FixedSizeVirtualScrollStrategy` from.\n */\nfunction _fixedSizeVirtualScrollStrategyFactory(fixedSizeDir) {\n  return fixedSizeDir._scrollStrategy;\n}\n/** A virtual scroll strategy that supports fixed-size items. */\nlet CdkFixedSizeVirtualScroll = /*#__PURE__*/(() => {\n  class CdkFixedSizeVirtualScroll {\n    /** The size of the items in the list (in pixels). */\n    get itemSize() {\n      return this._itemSize;\n    }\n    set itemSize(value) {\n      this._itemSize = coerceNumberProperty(value);\n    }\n    _itemSize = 20;\n    /**\n     * The minimum amount of buffer rendered beyond the viewport (in pixels).\n     * If the amount of buffer dips below this number, more items will be rendered. Defaults to 100px.\n     */\n    get minBufferPx() {\n      return this._minBufferPx;\n    }\n    set minBufferPx(value) {\n      this._minBufferPx = coerceNumberProperty(value);\n    }\n    _minBufferPx = 100;\n    /**\n     * The number of pixels worth of buffer to render for when rendering new items. Defaults to 200px.\n     */\n    get maxBufferPx() {\n      return this._maxBufferPx;\n    }\n    set maxBufferPx(value) {\n      this._maxBufferPx = coerceNumberProperty(value);\n    }\n    _maxBufferPx = 200;\n    /** The scroll strategy used by this directive. */\n    _scrollStrategy = new FixedSizeVirtualScrollStrategy(this.itemSize, this.minBufferPx, this.maxBufferPx);\n    ngOnChanges() {\n      this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx);\n    }\n    static ɵfac = function CdkFixedSizeVirtualScroll_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || CdkFixedSizeVirtualScroll)();\n    };\n    static ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkFixedSizeVirtualScroll,\n      selectors: [[\"cdk-virtual-scroll-viewport\", \"itemSize\", \"\"]],\n      inputs: {\n        itemSize: \"itemSize\",\n        minBufferPx: \"minBufferPx\",\n        maxBufferPx: \"maxBufferPx\"\n      },\n      features: [i0.ɵɵProvidersFeature([{\n        provide: VIRTUAL_SCROLL_STRATEGY,\n        useFactory: _fixedSizeVirtualScrollStrategyFactory,\n        deps: [forwardRef(() => CdkFixedSizeVirtualScroll)]\n      }]), i0.ɵɵNgOnChangesFeature]\n    });\n  }\n  return CdkFixedSizeVirtualScroll;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\n\n/** Time in ms to throttle the scrolling events by default. */\nconst DEFAULT_SCROLL_TIME = 20;\n/**\n * Service contained all registered Scrollable references and emits an event when any one of the\n * Scrollable references emit a scrolled event.\n */\nlet ScrollDispatcher = /*#__PURE__*/(() => {\n  class ScrollDispatcher {\n    _ngZone = inject(NgZone);\n    _platform = inject(Platform);\n    _renderer = inject(RendererFactory2).createRenderer(null, null);\n    _cleanupGlobalListener;\n    constructor() {}\n    /** Subject for notifying that a registered scrollable reference element has been scrolled. */\n    _scrolled = new Subject();\n    /** Keeps track of the amount of subscriptions to `scrolled`. Used for cleaning up afterwards. */\n    _scrolledCount = 0;\n    /**\n     * Map of all the scrollable references that are registered with the service and their\n     * scroll event subscriptions.\n     */\n    scrollContainers = new Map();\n    /**\n     * Registers a scrollable instance with the service and listens for its scrolled events. When the\n     * scrollable is scrolled, the service emits the event to its scrolled observable.\n     * @param scrollable Scrollable instance to be registered.\n     */\n    register(scrollable) {\n      if (!this.scrollContainers.has(scrollable)) {\n        this.scrollContainers.set(scrollable, scrollable.elementScrolled().subscribe(() => this._scrolled.next(scrollable)));\n      }\n    }\n    /**\n     * De-registers a Scrollable reference and unsubscribes from its scroll event observable.\n     * @param scrollable Scrollable instance to be deregistered.\n     */\n    deregister(scrollable) {\n      const scrollableReference = this.scrollContainers.get(scrollable);\n      if (scrollableReference) {\n        scrollableReference.unsubscribe();\n        this.scrollContainers.delete(scrollable);\n      }\n    }\n    /**\n     * Returns an observable that emits an event whenever any of the registered Scrollable\n     * references (or window, document, or body) fire a scrolled event. Can provide a time in ms\n     * to override the default \"throttle\" time.\n     *\n     * **Note:** in order to avoid hitting change detection for every scroll event,\n     * all of the events emitted from this stream will be run outside the Angular zone.\n     * If you need to update any data bindings as a result of a scroll event, you have\n     * to run the callback using `NgZone.run`.\n     */\n    scrolled(auditTimeInMs = DEFAULT_SCROLL_TIME) {\n      if (!this._platform.isBrowser) {\n        return of();\n      }\n      return new Observable(observer => {\n        if (!this._cleanupGlobalListener) {\n          this._cleanupGlobalListener = this._ngZone.runOutsideAngular(() => this._renderer.listen('document', 'scroll', () => this._scrolled.next()));\n        }\n        // In the case of a 0ms delay, use an observable without auditTime\n        // since it does add a perceptible delay in processing overhead.\n        const subscription = auditTimeInMs > 0 ? this._scrolled.pipe(auditTime(auditTimeInMs)).subscribe(observer) : this._scrolled.subscribe(observer);\n        this._scrolledCount++;\n        return () => {\n          subscription.unsubscribe();\n          this._scrolledCount--;\n          if (!this._scrolledCount) {\n            this._cleanupGlobalListener?.();\n            this._cleanupGlobalListener = undefined;\n          }\n        };\n      });\n    }\n    ngOnDestroy() {\n      this._cleanupGlobalListener?.();\n      this._cleanupGlobalListener = undefined;\n      this.scrollContainers.forEach((_, container) => this.deregister(container));\n      this._scrolled.complete();\n    }\n    /**\n     * Returns an observable that emits whenever any of the\n     * scrollable ancestors of an element are scrolled.\n     * @param elementOrElementRef Element whose ancestors to listen for.\n     * @param auditTimeInMs Time to throttle the scroll events.\n     */\n    ancestorScrolled(elementOrElementRef, auditTimeInMs) {\n      const ancestors = this.getAncestorScrollContainers(elementOrElementRef);\n      return this.scrolled(auditTimeInMs).pipe(filter(target => !target || ancestors.indexOf(target) > -1));\n    }\n    /** Returns all registered Scrollables that contain the provided element. */\n    getAncestorScrollContainers(elementOrElementRef) {\n      const scrollingContainers = [];\n      this.scrollContainers.forEach((_subscription, scrollable) => {\n        if (this._scrollableContainsElement(scrollable, elementOrElementRef)) {\n          scrollingContainers.push(scrollable);\n        }\n      });\n      return scrollingContainers;\n    }\n    /** Returns true if the element is contained within the provided Scrollable. */\n    _scrollableContainsElement(scrollable, elementOrElementRef) {\n      let element = coerceElement(elementOrElementRef);\n      let scrollableElement = scrollable.getElementRef().nativeElement;\n      // Traverse through the element parents until we reach null, checking if any of the elements\n      // are the scrollable's element.\n      do {\n        if (element == scrollableElement) {\n          return true;\n        }\n      } while (element = element.parentElement);\n      return false;\n    }\n    static ɵfac = function ScrollDispatcher_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || ScrollDispatcher)();\n    };\n    static ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: ScrollDispatcher,\n      factory: ScrollDispatcher.ɵfac,\n      providedIn: 'root'\n    });\n  }\n  return ScrollDispatcher;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\n\n/**\n * Sends an event when the directive's element is scrolled. Registers itself with the\n * ScrollDispatcher service to include itself as part of its collection of scrolling events that it\n * can be listened to through the service.\n */\nlet CdkScrollable = /*#__PURE__*/(() => {\n  class CdkScrollable {\n    elementRef = inject(ElementRef);\n    scrollDispatcher = inject(ScrollDispatcher);\n    ngZone = inject(NgZone);\n    dir = inject(Directionality, {\n      optional: true\n    });\n    _scrollElement = this.elementRef.nativeElement;\n    _destroyed = new Subject();\n    _renderer = inject(Renderer2);\n    _cleanupScroll;\n    _elementScrolled = new Subject();\n    constructor() {}\n    ngOnInit() {\n      this._cleanupScroll = this.ngZone.runOutsideAngular(() => this._renderer.listen(this._scrollElement, 'scroll', event => this._elementScrolled.next(event)));\n      this.scrollDispatcher.register(this);\n    }\n    ngOnDestroy() {\n      this._cleanupScroll?.();\n      this._elementScrolled.complete();\n      this.scrollDispatcher.deregister(this);\n      this._destroyed.next();\n      this._destroyed.complete();\n    }\n    /** Returns observable that emits when a scroll event is fired on the host element. */\n    elementScrolled() {\n      return this._elementScrolled;\n    }\n    /** Gets the ElementRef for the viewport. */\n    getElementRef() {\n      return this.elementRef;\n    }\n    /**\n     * Scrolls to the specified offsets. This is a normalized version of the browser's native scrollTo\n     * method, since browsers are not consistent about what scrollLeft means in RTL. For this method\n     * left and right always refer to the left and right side of the scrolling container irrespective\n     * of the layout direction. start and end refer to left and right in an LTR context and vice-versa\n     * in an RTL context.\n     * @param options specified the offsets to scroll to.\n     */\n    scrollTo(options) {\n      const el = this.elementRef.nativeElement;\n      const isRtl = this.dir && this.dir.value == 'rtl';\n      // Rewrite start & end offsets as right or left offsets.\n      if (options.left == null) {\n        options.left = isRtl ? options.end : options.start;\n      }\n      if (options.right == null) {\n        options.right = isRtl ? options.start : options.end;\n      }\n      // Rewrite the bottom offset as a top offset.\n      if (options.bottom != null) {\n        options.top = el.scrollHeight - el.clientHeight - options.bottom;\n      }\n      // Rewrite the right offset as a left offset.\n      if (isRtl && getRtlScrollAxisType() != RtlScrollAxisType.NORMAL) {\n        if (options.left != null) {\n          options.right = el.scrollWidth - el.clientWidth - options.left;\n        }\n        if (getRtlScrollAxisType() == RtlScrollAxisType.INVERTED) {\n          options.left = options.right;\n        } else if (getRtlScrollAxisType() == RtlScrollAxisType.NEGATED) {\n          options.left = options.right ? -options.right : options.right;\n        }\n      } else {\n        if (options.right != null) {\n          options.left = el.scrollWidth - el.clientWidth - options.right;\n        }\n      }\n      this._applyScrollToOptions(options);\n    }\n    _applyScrollToOptions(options) {\n      const el = this.elementRef.nativeElement;\n      if (supportsScrollBehavior()) {\n        el.scrollTo(options);\n      } else {\n        if (options.top != null) {\n          el.scrollTop = options.top;\n        }\n        if (options.left != null) {\n          el.scrollLeft = options.left;\n        }\n      }\n    }\n    /**\n     * Measures the scroll offset relative to the specified edge of the viewport. This method can be\n     * used instead of directly checking scrollLeft or scrollTop, since browsers are not consistent\n     * about what scrollLeft means in RTL. The values returned by this method are normalized such that\n     * left and right always refer to the left and right side of the scrolling container irrespective\n     * of the layout direction. start and end refer to left and right in an LTR context and vice-versa\n     * in an RTL context.\n     * @param from The edge to measure from.\n     */\n    measureScrollOffset(from) {\n      const LEFT = 'left';\n      const RIGHT = 'right';\n      const el = this.elementRef.nativeElement;\n      if (from == 'top') {\n        return el.scrollTop;\n      }\n      if (from == 'bottom') {\n        return el.scrollHeight - el.clientHeight - el.scrollTop;\n      }\n      // Rewrite start & end as left or right offsets.\n      const isRtl = this.dir && this.dir.value == 'rtl';\n      if (from == 'start') {\n        from = isRtl ? RIGHT : LEFT;\n      } else if (from == 'end') {\n        from = isRtl ? LEFT : RIGHT;\n      }\n      if (isRtl && getRtlScrollAxisType() == RtlScrollAxisType.INVERTED) {\n        // For INVERTED, scrollLeft is (scrollWidth - clientWidth) when scrolled all the way left and\n        // 0 when scrolled all the way right.\n        if (from == LEFT) {\n          return el.scrollWidth - el.clientWidth - el.scrollLeft;\n        } else {\n          return el.scrollLeft;\n        }\n      } else if (isRtl && getRtlScrollAxisType() == RtlScrollAxisType.NEGATED) {\n        // For NEGATED, scrollLeft is -(scrollWidth - clientWidth) when scrolled all the way left and\n        // 0 when scrolled all the way right.\n        if (from == LEFT) {\n          return el.scrollLeft + el.scrollWidth - el.clientWidth;\n        } else {\n          return -el.scrollLeft;\n        }\n      } else {\n        // For NORMAL, as well as non-RTL contexts, scrollLeft is 0 when scrolled all the way left and\n        // (scrollWidth - clientWidth) when scrolled all the way right.\n        if (from == LEFT) {\n          return el.scrollLeft;\n        } else {\n          return el.scrollWidth - el.clientWidth - el.scrollLeft;\n        }\n      }\n    }\n    static ɵfac = function CdkScrollable_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || CdkScrollable)();\n    };\n    static ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkScrollable,\n      selectors: [[\"\", \"cdk-scrollable\", \"\"], [\"\", \"cdkScrollable\", \"\"]]\n    });\n  }\n  return CdkScrollable;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\n\n/** Time in ms to throttle the resize events by default. */\nconst DEFAULT_RESIZE_TIME = 20;\n/**\n * Simple utility for getting the bounds of the browser viewport.\n * @docs-private\n */\nlet ViewportRuler = /*#__PURE__*/(() => {\n  class ViewportRuler {\n    _platform = inject(Platform);\n    _listeners;\n    /** Cached viewport dimensions. */\n    _viewportSize;\n    /** Stream of viewport change events. */\n    _change = new Subject();\n    /** Used to reference correct document/window */\n    _document = inject(DOCUMENT, {\n      optional: true\n    });\n    constructor() {\n      const ngZone = inject(NgZone);\n      const renderer = inject(RendererFactory2).createRenderer(null, null);\n      ngZone.runOutsideAngular(() => {\n        if (this._platform.isBrowser) {\n          const changeListener = event => this._change.next(event);\n          this._listeners = [renderer.listen('window', 'resize', changeListener), renderer.listen('window', 'orientationchange', changeListener)];\n        }\n        // Clear the cached position so that the viewport is re-measured next time it is required.\n        // We don't need to keep track of the subscription, because it is completed on destroy.\n        this.change().subscribe(() => this._viewportSize = null);\n      });\n    }\n    ngOnDestroy() {\n      this._listeners?.forEach(cleanup => cleanup());\n      this._change.complete();\n    }\n    /** Returns the viewport's width and height. */\n    getViewportSize() {\n      if (!this._viewportSize) {\n        this._updateViewportSize();\n      }\n      const output = {\n        width: this._viewportSize.width,\n        height: this._viewportSize.height\n      };\n      // If we're not on a browser, don't cache the size since it'll be mocked out anyway.\n      if (!this._platform.isBrowser) {\n        this._viewportSize = null;\n      }\n      return output;\n    }\n    /** Gets a DOMRect for the viewport's bounds. */\n    getViewportRect() {\n      // Use the document element's bounding rect rather than the window scroll properties\n      // (e.g. pageYOffset, scrollY) due to in issue in Chrome and IE where window scroll\n      // properties and client coordinates (boundingClientRect, clientX/Y, etc.) are in different\n      // conceptual viewports. Under most circumstances these viewports are equivalent, but they\n      // can disagree when the page is pinch-zoomed (on devices that support touch).\n      // See https://bugs.chromium.org/p/chromium/issues/detail?id=489206#c4\n      // We use the documentElement instead of the body because, by default (without a css reset)\n      // browsers typically give the document body an 8px margin, which is not included in\n      // getBoundingClientRect().\n      const scrollPosition = this.getViewportScrollPosition();\n      const {\n        width,\n        height\n      } = this.getViewportSize();\n      return {\n        top: scrollPosition.top,\n        left: scrollPosition.left,\n        bottom: scrollPosition.top + height,\n        right: scrollPosition.left + width,\n        height,\n        width\n      };\n    }\n    /** Gets the (top, left) scroll position of the viewport. */\n    getViewportScrollPosition() {\n      // While we can get a reference to the fake document\n      // during SSR, it doesn't have getBoundingClientRect.\n      if (!this._platform.isBrowser) {\n        return {\n          top: 0,\n          left: 0\n        };\n      }\n      // The top-left-corner of the viewport is determined by the scroll position of the document\n      // body, normally just (scrollLeft, scrollTop). However, Chrome and Firefox disagree about\n      // whether `document.body` or `document.documentElement` is the scrolled element, so reading\n      // `scrollTop` and `scrollLeft` is inconsistent. However, using the bounding rect of\n      // `document.documentElement` works consistently, where the `top` and `left` values will\n      // equal negative the scroll position.\n      const document = this._document;\n      const window = this._getWindow();\n      const documentElement = document.documentElement;\n      const documentRect = documentElement.getBoundingClientRect();\n      const top = -documentRect.top || document.body.scrollTop || window.scrollY || documentElement.scrollTop || 0;\n      const left = -documentRect.left || document.body.scrollLeft || window.scrollX || documentElement.scrollLeft || 0;\n      return {\n        top,\n        left\n      };\n    }\n    /**\n     * Returns a stream that emits whenever the size of the viewport changes.\n     * This stream emits outside of the Angular zone.\n     * @param throttleTime Time in milliseconds to throttle the stream.\n     */\n    change(throttleTime = DEFAULT_RESIZE_TIME) {\n      return throttleTime > 0 ? this._change.pipe(auditTime(throttleTime)) : this._change;\n    }\n    /** Use defaultView of injected document if available or fallback to global window reference */\n    _getWindow() {\n      return this._document.defaultView || window;\n    }\n    /** Updates the cached viewport size. */\n    _updateViewportSize() {\n      const window = this._getWindow();\n      this._viewportSize = this._platform.isBrowser ? {\n        width: window.innerWidth,\n        height: window.innerHeight\n      } : {\n        width: 0,\n        height: 0\n      };\n    }\n    static ɵfac = function ViewportRuler_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || ViewportRuler)();\n    };\n    static ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: ViewportRuler,\n      factory: ViewportRuler.ɵfac,\n      providedIn: 'root'\n    });\n  }\n  return ViewportRuler;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\nconst VIRTUAL_SCROLLABLE = /*#__PURE__*/new InjectionToken('VIRTUAL_SCROLLABLE');\n/**\n * Extending the {@link CdkScrollable} to be used as scrolling container for virtual scrolling.\n */\nlet CdkVirtualScrollable = /*#__PURE__*/(() => {\n  class CdkVirtualScrollable extends CdkScrollable {\n    constructor() {\n      super();\n    }\n    /**\n     * Measure the viewport size for the provided orientation.\n     *\n     * @param orientation The orientation to measure the size from.\n     */\n    measureViewportSize(orientation) {\n      const viewportEl = this.elementRef.nativeElement;\n      return orientation === 'horizontal' ? viewportEl.clientWidth : viewportEl.clientHeight;\n    }\n    static ɵfac = function CdkVirtualScrollable_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || CdkVirtualScrollable)();\n    };\n    static ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkVirtualScrollable,\n      features: [i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n  return CdkVirtualScrollable;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\n\n/** Checks if the given ranges are equal. */\nfunction rangesEqual(r1, r2) {\n  return r1.start == r2.start && r1.end == r2.end;\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 = typeof requestAnimationFrame !== 'undefined' ? animationFrameScheduler : asapScheduler;\n/** A viewport that virtualizes its scrolling with the help of `CdkVirtualForOf`. */\nlet CdkVirtualScrollViewport = /*#__PURE__*/(() => {\n  class CdkVirtualScrollViewport extends CdkVirtualScrollable {\n    elementRef = inject(ElementRef);\n    _changeDetectorRef = inject(ChangeDetectorRef);\n    _scrollStrategy = inject(VIRTUAL_SCROLL_STRATEGY, {\n      optional: true\n    });\n    scrollable = inject(VIRTUAL_SCROLLABLE, {\n      optional: true\n    });\n    _platform = inject(Platform);\n    /** Emits when the viewport is detached from a CdkVirtualForOf. */\n    _detachedSubject = new Subject();\n    /** Emits when the rendered range changes. */\n    _renderedRangeSubject = new Subject();\n    /** The direction the viewport scrolls. */\n    get orientation() {\n      return this._orientation;\n    }\n    set orientation(orientation) {\n      if (this._orientation !== orientation) {\n        this._orientation = orientation;\n        this._calculateSpacerSize();\n      }\n    }\n    _orientation = 'vertical';\n    /**\n     * Whether rendered items should persist in the DOM after scrolling out of view. By default, items\n     * will be removed.\n     */\n    appendOnly = false;\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    scrolledIndexChange = new Observable(observer => this._scrollStrategy.scrolledIndexChange.subscribe(index => Promise.resolve().then(() => this.ngZone.run(() => observer.next(index)))));\n    /** The element that wraps the rendered content. */\n    _contentWrapper;\n    /** A stream that emits whenever the rendered range changes. */\n    renderedRangeStream = this._renderedRangeSubject;\n    /**\n     * The total size of all content (in pixels), including content that is not currently rendered.\n     */\n    _totalContentSize = 0;\n    /** A string representing the `style.width` property value to be used for the spacer element. */\n    _totalContentWidth = '';\n    /** A string representing the `style.height` property value to be used for the spacer element. */\n    _totalContentHeight = '';\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    _renderedContentTransform;\n    /** The currently rendered range of indices. */\n    _renderedRange = {\n      start: 0,\n      end: 0\n    };\n    /** The length of the data bound to this viewport (in number of items). */\n    _dataLength = 0;\n    /** The size of the viewport (in pixels). */\n    _viewportSize = 0;\n    /** the currently attached CdkVirtualScrollRepeater. */\n    _forOf;\n    /** The last rendered content offset that was set. */\n    _renderedContentOffset = 0;\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    _renderedContentOffsetNeedsRewrite = false;\n    /** Whether there is a pending change detection cycle. */\n    _isChangeDetectionPending = false;\n    /** A list of functions to run after the next change detection cycle. */\n    _runAfterChangeDetection = [];\n    /** Subscription to changes in the viewport size. */\n    _viewportChanges = Subscription.EMPTY;\n    _injector = inject(Injector);\n    _isDestroyed = false;\n    constructor() {\n      super();\n      const viewportRuler = inject(ViewportRuler);\n      if (!this._scrollStrategy && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n        throw Error('Error: cdk-virtual-scroll-viewport requires the \"itemSize\" property to be set.');\n      }\n      this._viewportChanges = viewportRuler.change().subscribe(() => {\n        this.checkViewportSize();\n      });\n      if (!this.scrollable) {\n        // No scrollable is provided, so the virtual-scroll-viewport needs to become a scrollable\n        this.elementRef.nativeElement.classList.add('cdk-virtual-scrollable');\n        this.scrollable = this;\n      }\n    }\n    ngOnInit() {\n      // Scrolling depends on the element dimensions which we can't get during SSR.\n      if (!this._platform.isBrowser) {\n        return;\n      }\n      if (this.scrollable === this) {\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        this.scrollable.elementScrolled().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        // Usually `elementScrolled` is completed when the scrollable is destroyed, but\n        // that may not be the case if a `CdkVirtualScrollableElement` is used so we have\n        // to unsubscribe here just in case.\n        takeUntil(this._destroyed)).subscribe(() => this._scrollStrategy.onContentScrolled());\n        this._markChangeDetectionNeeded();\n      }));\n    }\n    ngOnDestroy() {\n      this.detach();\n      this._scrollStrategy.detach();\n      // Complete all subjects\n      this._renderedRangeSubject.complete();\n      this._detachedSubject.complete();\n      this._viewportChanges.unsubscribe();\n      this._isDestroyed = true;\n      super.ngOnDestroy();\n    }\n    /** Attaches a `CdkVirtualScrollRepeater` to this viewport. */\n    attach(forOf) {\n      if (this._forOf && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n        throw Error('CdkVirtualScrollViewport is already attached.');\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    /** Detaches the current `CdkVirtualForOf`. */\n    detach() {\n      this._forOf = null;\n      this._detachedSubject.next();\n    }\n    /** Gets the length of the data bound to this viewport (in number of items). */\n    getDataLength() {\n      return this._dataLength;\n    }\n    /** Gets the size of the viewport (in pixels). */\n    getViewportSize() {\n      return this._viewportSize;\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    /** Get the current rendered range of items. */\n    getRenderedRange() {\n      return this._renderedRange;\n    }\n    measureBoundingClientRectWithScrollOffset(from) {\n      return this.getElementRef().nativeElement.getBoundingClientRect()[from];\n    }\n    /**\n     * Sets the total size of all content (in pixels), including content that is not currently\n     * rendered.\n     */\n    setTotalContentSize(size) {\n      if (this._totalContentSize !== size) {\n        this._totalContentSize = size;\n        this._calculateSpacerSize();\n        this._markChangeDetectionNeeded();\n      }\n    }\n    /** Sets the currently rendered range of indices. */\n    setRenderedRange(range) {\n      if (!rangesEqual(this._renderedRange, range)) {\n        if (this.appendOnly) {\n          range = {\n            start: 0,\n            end: Math.max(this._renderedRange.end, range.end)\n          };\n        }\n        this._renderedRangeSubject.next(this._renderedRange = range);\n        this._markChangeDetectionNeeded(() => this._scrollStrategy.onContentRendered());\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() {\n      return this._renderedContentOffsetNeedsRewrite ? null : this._renderedContentOffset;\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, to = 'to-start') {\n      // In appendOnly, we always start from the top\n      offset = this.appendOnly && to === 'to-start' ? 0 : offset;\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     * 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, behavior = 'auto') {\n      const options = {\n        behavior\n      };\n      if (this.orientation === 'horizontal') {\n        options.start = offset;\n      } else {\n        options.top = offset;\n      }\n      this.scrollable.scrollTo(options);\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, behavior = 'auto') {\n      this._scrollStrategy.scrollToIndex(index, behavior);\n    }\n    /**\n     * Gets the current scroll offset from the start of the scrollable (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) {\n      // This is to break the call cycle\n      let measureScrollOffset;\n      if (this.scrollable == this) {\n        measureScrollOffset = _from => super.measureScrollOffset(_from);\n      } else {\n        measureScrollOffset = _from => this.scrollable.measureScrollOffset(_from);\n      }\n      return Math.max(0, measureScrollOffset(from ?? (this.orientation === 'horizontal' ? 'start' : 'top')) - this.measureViewportOffset());\n    }\n    /**\n     * Measures the offset of the viewport from the scrolling container\n     * @param from The edge to measure from.\n     */\n    measureViewportOffset(from) {\n      let fromRect;\n      const LEFT = 'left';\n      const RIGHT = 'right';\n      const isRtl = this.dir?.value == 'rtl';\n      if (from == 'start') {\n        fromRect = isRtl ? RIGHT : LEFT;\n      } else if (from == 'end') {\n        fromRect = isRtl ? LEFT : RIGHT;\n      } else if (from) {\n        fromRect = from;\n      } else {\n        fromRect = this.orientation === 'horizontal' ? 'left' : 'top';\n      }\n      const scrollerClientRect = this.scrollable.measureBoundingClientRectWithScrollOffset(fromRect);\n      const viewportClientRect = this.elementRef.nativeElement.getBoundingClientRect()[fromRect];\n      return viewportClientRect - scrollerClientRect;\n    }\n    /** Measure the combined size of all of the rendered items. */\n    measureRenderedContentSize() {\n      const contentEl = this._contentWrapper.nativeElement;\n      return this.orientation === 'horizontal' ? contentEl.offsetWidth : contentEl.offsetHeight;\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) {\n      if (!this._forOf) {\n        return 0;\n      }\n      return this._forOf.measureRangeSize(range, this.orientation);\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    /** Measure the viewport size. */\n    _measureViewportSize() {\n      this._viewportSize = this.scrollable.measureViewportSize(this.orientation);\n    }\n    /** Queue up change detection to run. */\n    _markChangeDetectionNeeded(runAfter) {\n      if (runAfter) {\n        this._runAfterChangeDetection.push(runAfter);\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    /** Run change detection. */\n    _doChangeDetection() {\n      if (this._isDestroyed) {\n        return;\n      }\n      this.ngZone.run(() => {\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._changeDetectorRef.markForCheck();\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        afterNextRender(() => {\n          this._isChangeDetectionPending = false;\n          const runAfterChangeDetection = this._runAfterChangeDetection;\n          this._runAfterChangeDetection = [];\n          for (const fn of runAfterChangeDetection) {\n            fn();\n          }\n        }, {\n          injector: this._injector\n        });\n      });\n    }\n    /** Calculates the `style.width` and `style.height` for the spacer element. */\n    _calculateSpacerSize() {\n      this._totalContentHeight = this.orientation === 'horizontal' ? '' : `${this._totalContentSize}px`;\n      this._totalContentWidth = this.orientation === 'horizontal' ? `${this._totalContentSize}px` : '';\n    }\n    static ɵfac = function CdkVirtualScrollViewport_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || CdkVirtualScrollViewport)();\n    };\n    static ɵcmp = /* @__PURE__ */i0.ɵɵdefineComponent({\n      type: CdkVirtualScrollViewport,\n      selectors: [[\"cdk-virtual-scroll-viewport\"]],\n      viewQuery: function CdkVirtualScrollViewport_Query(rf, ctx) {\n        if (rf & 1) {\n          i0.ɵɵviewQuery(_c0, 7);\n        }\n        if (rf & 2) {\n          let _t;\n          i0.ɵɵqueryRefresh(_t = i0.ɵɵloadQuery()) && (ctx._contentWrapper = _t.first);\n        }\n      },\n      hostAttrs: [1, \"cdk-virtual-scroll-viewport\"],\n      hostVars: 4,\n      hostBindings: function CdkVirtualScrollViewport_HostBindings(rf, ctx) {\n        if (rf & 2) {\n          i0.ɵɵclassProp(\"cdk-virtual-scroll-orientation-horizontal\", ctx.orientation === \"horizontal\")(\"cdk-virtual-scroll-orientation-vertical\", ctx.orientation !== \"horizontal\");\n        }\n      },\n      inputs: {\n        orientation: \"orientation\",\n        appendOnly: [2, \"appendOnly\", \"appendOnly\", booleanAttribute]\n      },\n      outputs: {\n        scrolledIndexChange: \"scrolledIndexChange\"\n      },\n      features: [i0.ɵɵProvidersFeature([{\n        provide: CdkScrollable,\n        useFactory: (virtualScrollable, viewport) => virtualScrollable || viewport,\n        deps: [[new Optional(), new Inject(VIRTUAL_SCROLLABLE)], CdkVirtualScrollViewport]\n      }]), i0.ɵɵInheritDefinitionFeature],\n      ngContentSelectors: _c1,\n      decls: 4,\n      vars: 4,\n      consts: [[\"contentWrapper\", \"\"], [1, \"cdk-virtual-scroll-content-wrapper\"], [1, \"cdk-virtual-scroll-spacer\"]],\n      template: function CdkVirtualScrollViewport_Template(rf, ctx) {\n        if (rf & 1) {\n          i0.ɵɵprojectionDef();\n          i0.ɵɵelementStart(0, \"div\", 1, 0);\n          i0.ɵɵprojection(2);\n          i0.ɵɵelementEnd();\n          i0.ɵɵelement(3, \"div\", 2);\n        }\n        if (rf & 2) {\n          i0.ɵɵadvance(3);\n          i0.ɵɵstyleProp(\"width\", ctx._totalContentWidth)(\"height\", ctx._totalContentHeight);\n        }\n      },\n      styles: [\"cdk-virtual-scroll-viewport{display:block;position:relative;transform:translateZ(0)}.cdk-virtual-scrollable{overflow:auto;will-change:scroll-position;contain:strict}.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{height:1px;transform-origin:0 0;flex:0 0 auto}[dir=rtl] .cdk-virtual-scroll-spacer{transform-origin:100% 0}\"],\n      encapsulation: 2,\n      changeDetection: 0\n    });\n  }\n  return CdkVirtualScrollViewport;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\n\n/** Helper to extract the offset of a DOM Node in a certain direction. */\nfunction getOffset(orientation, direction, node) {\n  const el = node;\n  if (!el.getBoundingClientRect) {\n    return 0;\n  }\n  const rect = el.getBoundingClientRect();\n  if (orientation === 'horizontal') {\n    return direction === 'start' ? rect.left : rect.right;\n  }\n  return direction === 'start' ? rect.top : rect.bottom;\n}\n/**\n * A directive similar to `ngForOf` to be used for rendering data inside a virtual scrolling\n * container.\n */\nlet CdkVirtualForOf = /*#__PURE__*/(() => {\n  class CdkVirtualForOf {\n    _viewContainerRef = inject(ViewContainerRef);\n    _template = inject(TemplateRef);\n    _differs = inject(IterableDiffers);\n    _viewRepeater = inject(_VIEW_REPEATER_STRATEGY);\n    _viewport = inject(CdkVirtualScrollViewport, {\n      skipSelf: true\n    });\n    /** Emits when the rendered view of the data changes. */\n    viewChange = new Subject();\n    /** Subject that emits when a new DataSource instance is given. */\n    _dataSourceChanges = new Subject();\n    /** The DataSource to display. */\n    get cdkVirtualForOf() {\n      return this._cdkVirtualForOf;\n    }\n    set cdkVirtualForOf(value) {\n      this._cdkVirtualForOf = value;\n      if (isDataSource(value)) {\n        this._dataSourceChanges.next(value);\n      } else {\n        // If value is an an NgIterable, convert it to an array.\n        this._dataSourceChanges.next(new ArrayDataSource(isObservable(value) ? value : Array.from(value || [])));\n      }\n    }\n    _cdkVirtualForOf;\n    /**\n     * The `TrackByFunction` to use for tracking changes. The `TrackByFunction` takes the index and\n     * the item and produces a value to be used as the item's identity when tracking changes.\n     */\n    get cdkVirtualForTrackBy() {\n      return this._cdkVirtualForTrackBy;\n    }\n    set cdkVirtualForTrackBy(fn) {\n      this._needsUpdate = true;\n      this._cdkVirtualForTrackBy = fn ? (index, item) => fn(index + (this._renderedRange ? this._renderedRange.start : 0), item) : undefined;\n    }\n    _cdkVirtualForTrackBy;\n    /** The template used to stamp out new elements. */\n    set cdkVirtualForTemplate(value) {\n      if (value) {\n        this._needsUpdate = true;\n        this._template = value;\n      }\n    }\n    /**\n     * The size of the cache used to store templates that are not being used for re-use later.\n     * Setting the cache size to `0` will disable caching. Defaults to 20 templates.\n     */\n    get cdkVirtualForTemplateCacheSize() {\n      return this._viewRepeater.viewCacheSize;\n    }\n    set cdkVirtualForTemplateCacheSize(size) {\n      this._viewRepeater.viewCacheSize = coerceNumberProperty(size);\n    }\n    /** Emits whenever the data in the current DataSource changes. */\n    dataStream = this._dataSourceChanges.pipe(\n    // Start off with null `DataSource`.\n    startWith(null),\n    // Bundle up the previous and current data sources so we can work with both.\n    pairwise(),\n    // Use `_changeDataSource` to disconnect from the previous data source and connect to the\n    // new one, passing back a stream of data changes which we run through `switchMap` to give\n    // us a data stream that emits the latest data from whatever the current `DataSource` is.\n    switchMap(([prev, cur]) => this._changeDataSource(prev, cur)),\n    // Replay the last emitted data when someone subscribes.\n    shareReplay(1));\n    /** The differ used to calculate changes to the data. */\n    _differ = null;\n    /** The most recent data emitted from the DataSource. */\n    _data;\n    /** The currently rendered items. */\n    _renderedItems;\n    /** The currently rendered range of indices. */\n    _renderedRange;\n    /** Whether the rendered data should be updated during the next ngDoCheck cycle. */\n    _needsUpdate = false;\n    _destroyed = new Subject();\n    constructor() {\n      const ngZone = inject(NgZone);\n      this.dataStream.subscribe(data => {\n        this._data = data;\n        this._onRenderedDataChange();\n      });\n      this._viewport.renderedRangeStream.pipe(takeUntil(this._destroyed)).subscribe(range => {\n        this._renderedRange = range;\n        if (this.viewChange.observers.length) {\n          ngZone.run(() => this.viewChange.next(this._renderedRange));\n        }\n        this._onRenderedDataChange();\n      });\n      this._viewport.attach(this);\n    }\n    /**\n     * Measures the combined size (width for horizontal orientation, height for vertical) of all items\n     * in the specified range. Throws an error if the range includes items that are not currently\n     * rendered.\n     */\n    measureRangeSize(range, orientation) {\n      if (range.start >= range.end) {\n        return 0;\n      }\n      if ((range.start < this._renderedRange.start || range.end > this._renderedRange.end) && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n        throw Error(`Error: attempted to measure an item that isn't rendered.`);\n      }\n      // The index into the list of rendered views for the first item in the range.\n      const renderedStartIndex = range.start - this._renderedRange.start;\n      // The length of the range we're measuring.\n      const rangeLen = range.end - range.start;\n      // Loop over all the views, find the first and land node and compute the size by subtracting\n      // the top of the first node from the bottom of the last one.\n      let firstNode;\n      let lastNode;\n      // Find the first node by starting from the beginning and going forwards.\n      for (let i = 0; i < rangeLen; i++) {\n        const view = this._viewContainerRef.get(i + renderedStartIndex);\n        if (view && view.rootNodes.length) {\n          firstNode = lastNode = view.rootNodes[0];\n          break;\n        }\n      }\n      // Find the last node by starting from the end and going backwards.\n      for (let i = rangeLen - 1; i > -1; i--) {\n        const view = this._viewContainerRef.get(i + renderedStartIndex);\n        if (view && view.rootNodes.length) {\n          lastNode = view.rootNodes[view.rootNodes.length - 1];\n          break;\n        }\n      }\n      return firstNode && lastNode ? getOffset(orientation, 'end', lastNode) - getOffset(orientation, 'start', firstNode) : 0;\n    }\n    ngDoCheck() {\n      if (this._differ && this._needsUpdate) {\n        // TODO(mmalerba): We should differentiate needs update due to scrolling and a new portion of\n        // this list being rendered (can use simpler algorithm) vs needs update due to data actually\n        // changing (need to do this diff).\n        const changes = this._differ.diff(this._renderedItems);\n        if (!changes) {\n          this._updateContext();\n        } else {\n          this._applyChanges(changes);\n        }\n        this._needsUpdate = false;\n      }\n    }\n    ngOnDestroy() {\n      this._viewport.detach();\n      this._dataSourceChanges.next(undefined);\n      this._dataSourceChanges.complete();\n      this.viewChange.complete();\n      this._destroyed.next();\n      this._destroyed.complete();\n      this._viewRepeater.detach();\n    }\n    /** React to scroll state changes in the viewport. */\n    _onRenderedDataChange() {\n      if (!this._renderedRange) {\n        return;\n      }\n      this._renderedItems = this._data.slice(this._renderedRange.start, this._renderedRange.end);\n      if (!this._differ) {\n        // Use a wrapper function for the `trackBy` so any new values are\n        // picked up automatically without having to recreate the differ.\n        this._differ = this._differs.find(this._renderedItems).create((index, item) => {\n          return this.cdkVirtualForTrackBy ? this.cdkVirtualForTrackBy(index, item) : item;\n        });\n      }\n      this._needsUpdate = true;\n    }\n    /** Swap out one `DataSource` for another. */\n    _changeDataSource(oldDs, newDs) {\n      if (oldDs) {\n        oldDs.disconnect(this);\n      }\n      this._needsUpdate = true;\n      return newDs ? newDs.connect(this) : of();\n    }\n    /** Update the `CdkVirtualForOfContext` for all views. */\n    _updateContext() {\n      const count = this._data.length;\n      let i = this._viewContainerRef.length;\n      while (i--) {\n        const view = this._viewContainerRef.get(i);\n        view.context.index = this._renderedRange.start + i;\n        view.context.count = count;\n        this._updateComputedContextProperties(view.context);\n        view.detectChanges();\n      }\n    }\n    /** Apply changes to the DOM. */\n    _applyChanges(changes) {\n      this._viewRepeater.applyChanges(changes, this._viewContainerRef, (record, _adjustedPreviousIndex, currentIndex) => this._getEmbeddedViewArgs(record, currentIndex), record => record.item);\n      // Update $implicit for any items that had an identity change.\n      changes.forEachIdentityChange(record => {\n        const view = this._viewContainerRef.get(record.currentIndex);\n        view.context.$implicit = record.item;\n      });\n      // Update the context variables on all items.\n      const count = this._data.length;\n      let i = this._viewContainerRef.length;\n      while (i--) {\n        const view = this._viewContainerRef.get(i);\n        view.context.index = this._renderedRange.start + i;\n        view.context.count = count;\n        this._updateComputedContextProperties(view.context);\n      }\n    }\n    /** Update the computed properties on the `CdkVirtualForOfContext`. */\n    _updateComputedContextProperties(context) {\n      context.first = context.index === 0;\n      context.last = context.index === context.count - 1;\n      context.even = context.index % 2 === 0;\n      context.odd = !context.even;\n    }\n    _getEmbeddedViewArgs(record, index) {\n      // Note that it's important that we insert the item directly at the proper index,\n      // rather than inserting it and the moving it in place, because if there's a directive\n      // on the same node that injects the `ViewContainerRef`, Angular will insert another\n      // comment node which can throw off the move when it's being repeated for all items.\n      return {\n        templateRef: this._template,\n        context: {\n          $implicit: record.item,\n          // It's guaranteed that the iterable is not \"undefined\" or \"null\" because we only\n          // generate views for elements if the \"cdkVirtualForOf\" iterable has elements.\n          cdkVirtualForOf: this._cdkVirtualForOf,\n          index: -1,\n          count: -1,\n          first: false,\n          last: false,\n          odd: false,\n          even: false\n        },\n        index\n      };\n    }\n    static ngTemplateContextGuard(directive, context) {\n      return true;\n    }\n    static ɵfac = function CdkVirtualForOf_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || CdkVirtualForOf)();\n    };\n    static ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkVirtualForOf,\n      selectors: [[\"\", \"cdkVirtualFor\", \"\", \"cdkVirtualForOf\", \"\"]],\n      inputs: {\n        cdkVirtualForOf: \"cdkVirtualForOf\",\n        cdkVirtualForTrackBy: \"cdkVirtualForTrackBy\",\n        cdkVirtualForTemplate: \"cdkVirtualForTemplate\",\n        cdkVirtualForTemplateCacheSize: \"cdkVirtualForTemplateCacheSize\"\n      },\n      features: [i0.ɵɵProvidersFeature([{\n        provide: _VIEW_REPEATER_STRATEGY,\n        useClass: _RecycleViewRepeaterStrategy\n      }])]\n    });\n  }\n  return CdkVirtualForOf;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\n\n/**\n * Provides a virtual scrollable for the element it is attached to.\n */\nlet CdkVirtualScrollableElement = /*#__PURE__*/(() => {\n  class CdkVirtualScrollableElement extends CdkVirtualScrollable {\n    constructor() {\n      super();\n    }\n    measureBoundingClientRectWithScrollOffset(from) {\n      return this.getElementRef().nativeElement.getBoundingClientRect()[from] - this.measureScrollOffset(from);\n    }\n    static ɵfac = function CdkVirtualScrollableElement_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || CdkVirtualScrollableElement)();\n    };\n    static ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkVirtualScrollableElement,\n      selectors: [[\"\", \"cdkVirtualScrollingElement\", \"\"]],\n      hostAttrs: [1, \"cdk-virtual-scrollable\"],\n      features: [i0.ɵɵProvidersFeature([{\n        provide: VIRTUAL_SCROLLABLE,\n        useExisting: CdkVirtualScrollableElement\n      }]), i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n  return CdkVirtualScrollableElement;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\n\n/**\n * Provides as virtual scrollable for the global / window scrollbar.\n */\nlet CdkVirtualScrollableWindow = /*#__PURE__*/(() => {\n  class CdkVirtualScrollableWindow extends CdkVirtualScrollable {\n    constructor() {\n      super();\n      const document = inject(DOCUMENT);\n      this.elementRef = new ElementRef(document.documentElement);\n      this._scrollElement = document;\n    }\n    measureBoundingClientRectWithScrollOffset(from) {\n      return this.getElementRef().nativeElement.getBoundingClientRect()[from];\n    }\n    static ɵfac = function CdkVirtualScrollableWindow_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || CdkVirtualScrollableWindow)();\n    };\n    static ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkVirtualScrollableWindow,\n      selectors: [[\"cdk-virtual-scroll-viewport\", \"scrollWindow\", \"\"]],\n      features: [i0.ɵɵProvidersFeature([{\n        provide: VIRTUAL_SCROLLABLE,\n        useExisting: CdkVirtualScrollableWindow\n      }]), i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n  return CdkVirtualScrollableWindow;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\nlet CdkScrollableModule = /*#__PURE__*/(() => {\n  class CdkScrollableModule {\n    static ɵfac = function CdkScrollableModule_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || CdkScrollableModule)();\n    };\n    static ɵmod = /* @__PURE__ */i0.ɵɵdefineNgModule({\n      type: CdkScrollableModule\n    });\n    static ɵinj = /* @__PURE__ */i0.ɵɵdefineInjector({});\n  }\n  return CdkScrollableModule;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\n/**\n * @docs-primary-export\n */\nlet ScrollingModule = /*#__PURE__*/(() => {\n  class ScrollingModule {\n    static ɵfac = function ScrollingModule_Factory(__ngFactoryType__) {\n      return new (__ngFactoryType__ || ScrollingModule)();\n    };\n    static ɵmod = /* @__PURE__ */i0.ɵɵdefineNgModule({\n      type: ScrollingModule\n    });\n    static ɵinj = /* @__PURE__ */i0.ɵɵdefineInjector({\n      imports: [BidiModule, CdkScrollableModule, BidiModule, CdkScrollableModule]\n    });\n  }\n  return ScrollingModule;\n})();\n/*#__PURE__*/(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && void 0;\n})();\nexport { CdkScrollableModule as C, DEFAULT_SCROLL_TIME as D, FixedSizeVirtualScrollStrategy as F, ScrollDispatcher as S, ViewportRuler as V, _fixedSizeVirtualScrollStrategyFactory as _, ScrollingModule as a, CdkScrollable as b, CdkFixedSizeVirtualScroll as c, CdkVirtualForOf as d, CdkVirtualScrollViewport as e, CdkVirtualScrollableWindow as f, CdkVirtualScrollableElement as g, DEFAULT_RESIZE_TIME as h, VIRTUAL_SCROLL_STRATEGY as i, VIRTUAL_SCROLLABLE as j, CdkVirtualScrollable as k 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