{
  "version": 3,
  "sources": ["../../../../../node_modules/@angular/cdk/fesm2022/collections.mjs", "../../../../../node_modules/@angular/cdk/fesm2022/scrolling.mjs", "../../../../../node_modules/@angular/cdk/fesm2022/portal.mjs", "../../../../../node_modules/@angular/cdk/fesm2022/overlay.mjs"],
  "sourcesContent": ["import { ConnectableObservable, isObservable, of, Subject } from 'rxjs';\nimport * as i0 from '@angular/core';\nimport { Injectable, InjectionToken } from '@angular/core';\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}\n\n/** DataSource wrapper for a native array. */\nclass ArrayDataSource extends DataSource {\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/**\n * A repeater that destroys views when they are removed from a\n * {@link ViewContainerRef}. When new items are inserted into the container,\n * the repeater will always construct a new embedded view for each item.\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 _DisposeViewRepeaterStrategy {\n  applyChanges(changes, viewContainerRef, itemContextFactory, itemValueResolver, itemViewChanged) {\n    changes.forEachOperation((record, adjustedPreviousIndex, currentIndex) => {\n      let view;\n      let operation;\n      if (record.previousIndex == null) {\n        const insertContext = itemContextFactory(record, adjustedPreviousIndex, currentIndex);\n        view = viewContainerRef.createEmbeddedView(insertContext.templateRef, insertContext.context, insertContext.index);\n        operation = 1 /* _ViewRepeaterOperation.INSERTED */;\n      } else if (currentIndex == null) {\n        viewContainerRef.remove(adjustedPreviousIndex);\n        operation = 3 /* _ViewRepeaterOperation.REMOVED */;\n      } else {\n        view = viewContainerRef.get(adjustedPreviousIndex);\n        viewContainerRef.move(view, currentIndex);\n        operation = 2 /* _ViewRepeaterOperation.MOVED */;\n      }\n\n      if (itemViewChanged) {\n        itemViewChanged({\n          context: view?.context,\n          operation,\n          record\n        });\n      }\n    });\n  }\n  detach() {}\n}\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  constructor() {\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    this.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    this._viewCache = [];\n  }\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 ? 1 /* _ViewRepeaterOperation.INSERTED */ : 0 /* _ViewRepeaterOperation.REPLACED */;\n      } else if (currentIndex == null) {\n        // Item removed.\n        this._detachAndCacheView(adjustedPreviousIndex, viewContainerRef);\n        operation = 3 /* _ViewRepeaterOperation.REMOVED */;\n      } else {\n        // Item moved.\n        view = this._moveView(adjustedPreviousIndex, currentIndex, viewContainerRef, itemValueResolver(record));\n        operation = 2 /* _ViewRepeaterOperation.MOVED */;\n      }\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}\n\n/**\n * Class to be used to power selecting one or more options from a list.\n */\nclass SelectionModel {\n  /** Selected values. */\n  get selected() {\n    if (!this._selected) {\n      this._selected = Array.from(this._selection.values());\n    }\n    return this._selected;\n  }\n  constructor(_multiple = false, initiallySelectedValues, _emitChanges = true, compareWith) {\n    this._multiple = _multiple;\n    this._emitChanges = _emitChanges;\n    this.compareWith = compareWith;\n    /** Currently-selected values. */\n    this._selection = new Set();\n    /** Keeps track of the deselected options that haven't been emitted by the change event. */\n    this._deselectedToEmit = [];\n    /** Keeps track of the selected options that haven't been emitted by the change event. */\n    this._selectedToEmit = [];\n    /** Event emitted when the value has changed. */\n    this.changed = new Subject();\n    if (initiallySelectedValues && initiallySelectedValues.length) {\n      if (_multiple) {\n        initiallySelectedValues.forEach(value => this._markSelected(value));\n      } else {\n        this._markSelected(initiallySelectedValues[0]);\n      }\n      // Clear the array in order to avoid firing the change event for preselected values.\n      this._selectedToEmit.length = 0;\n    }\n  }\n  /**\n   * Selects a value or an array of values.\n   * @param values The values to select\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  select(...values) {\n    this._verifyValueAssignment(values);\n    values.forEach(value => this._markSelected(value));\n    const changed = this._hasQueuedChanges();\n    this._emitChangeEvent();\n    return changed;\n  }\n  /**\n   * Deselects a value or an array of values.\n   * @param values The values to deselect\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  deselect(...values) {\n    this._verifyValueAssignment(values);\n    values.forEach(value => this._unmarkSelected(value));\n    const changed = this._hasQueuedChanges();\n    this._emitChangeEvent();\n    return changed;\n  }\n  /**\n   * Sets the selected values\n   * @param values The new selected values\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  setSelection(...values) {\n    this._verifyValueAssignment(values);\n    const oldValues = this.selected;\n    const newSelectedSet = new Set(values);\n    values.forEach(value => this._markSelected(value));\n    oldValues.filter(value => !newSelectedSet.has(value)).forEach(value => this._unmarkSelected(value));\n    const changed = this._hasQueuedChanges();\n    this._emitChangeEvent();\n    return changed;\n  }\n  /**\n   * Toggles a value between selected and deselected.\n   * @param value The value to toggle\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  toggle(value) {\n    return this.isSelected(value) ? this.deselect(value) : this.select(value);\n  }\n  /**\n   * Clears all of the selected values.\n   * @param flushEvent Whether to flush the changes in an event.\n   *   If false, the changes to the selection will be flushed along with the next event.\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  clear(flushEvent = true) {\n    this._unmarkAll();\n    const changed = this._hasQueuedChanges();\n    if (flushEvent) {\n      this._emitChangeEvent();\n    }\n    return changed;\n  }\n  /**\n   * Determines whether a value is selected.\n   */\n  isSelected(value) {\n    return this._selection.has(this._getConcreteValue(value));\n  }\n  /**\n   * Determines whether the model does not have a value.\n   */\n  isEmpty() {\n    return this._selection.size === 0;\n  }\n  /**\n   * Determines whether the model has a value.\n   */\n  hasValue() {\n    return !this.isEmpty();\n  }\n  /**\n   * Sorts the selected values based on a predicate function.\n   */\n  sort(predicate) {\n    if (this._multiple && this.selected) {\n      this._selected.sort(predicate);\n    }\n  }\n  /**\n   * Gets whether multiple values can be selected.\n   */\n  isMultipleSelection() {\n    return this._multiple;\n  }\n  /** Emits a change event and clears the records of selected and deselected values. */\n  _emitChangeEvent() {\n    // Clear the selected values so they can be re-cached.\n    this._selected = null;\n    if (this._selectedToEmit.length || this._deselectedToEmit.length) {\n      this.changed.next({\n        source: this,\n        added: this._selectedToEmit,\n        removed: this._deselectedToEmit\n      });\n      this._deselectedToEmit = [];\n      this._selectedToEmit = [];\n    }\n  }\n  /** Selects a value. */\n  _markSelected(value) {\n    value = this._getConcreteValue(value);\n    if (!this.isSelected(value)) {\n      if (!this._multiple) {\n        this._unmarkAll();\n      }\n      if (!this.isSelected(value)) {\n        this._selection.add(value);\n      }\n      if (this._emitChanges) {\n        this._selectedToEmit.push(value);\n      }\n    }\n  }\n  /** Deselects a value. */\n  _unmarkSelected(value) {\n    value = this._getConcreteValue(value);\n    if (this.isSelected(value)) {\n      this._selection.delete(value);\n      if (this._emitChanges) {\n        this._deselectedToEmit.push(value);\n      }\n    }\n  }\n  /** Clears out the selected values. */\n  _unmarkAll() {\n    if (!this.isEmpty()) {\n      this._selection.forEach(value => this._unmarkSelected(value));\n    }\n  }\n  /**\n   * Verifies the value assignment and throws an error if the specified value array is\n   * including multiple values while the selection model is not supporting multiple values.\n   */\n  _verifyValueAssignment(values) {\n    if (values.length > 1 && !this._multiple && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw getMultipleValuesInSingleSelectionError();\n    }\n  }\n  /** Whether there are queued up change to be emitted. */\n  _hasQueuedChanges() {\n    return !!(this._deselectedToEmit.length || this._selectedToEmit.length);\n  }\n  /** Returns a value that is comparable to inputValue by applying compareWith function, returns the same inputValue otherwise. */\n  _getConcreteValue(inputValue) {\n    if (!this.compareWith) {\n      return inputValue;\n    } else {\n      for (let selectedValue of this._selection) {\n        if (this.compareWith(inputValue, selectedValue)) {\n          return selectedValue;\n        }\n      }\n      return inputValue;\n    }\n  }\n}\n/**\n * Returns an error that reports that multiple values are passed into a selection model\n * with a single value.\n * @docs-private\n */\nfunction getMultipleValuesInSingleSelectionError() {\n  return Error('Cannot pass multiple values into SelectionModel with single-value mode.');\n}\n\n/**\n * Class to coordinate unique selection based on name.\n * Intended to be consumed as an Angular service.\n * This service is needed because native radio change events are only fired on the item currently\n * being selected, and we still need to uncheck the previous selection.\n *\n * This service does not *store* any IDs and names because they may change at any time, so it is\n * less error-prone if they are simply passed through when the events occur.\n */\nclass UniqueSelectionDispatcher {\n  constructor() {\n    this._listeners = [];\n  }\n  /**\n   * Notify other items that selection for the given name has been set.\n   * @param id ID of the item.\n   * @param name Name of the item.\n   */\n  notify(id, name) {\n    for (let listener of this._listeners) {\n      listener(id, name);\n    }\n  }\n  /**\n   * Listen for future changes to item selection.\n   * @return Function used to deregister listener\n   */\n  listen(listener) {\n    this._listeners.push(listener);\n    return () => {\n      this._listeners = this._listeners.filter(registered => {\n        return listener !== registered;\n      });\n    };\n  }\n  ngOnDestroy() {\n    this._listeners = [];\n  }\n  static {\n    this.ɵfac = function UniqueSelectionDispatcher_Factory(t) {\n      return new (t || UniqueSelectionDispatcher)();\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: UniqueSelectionDispatcher,\n      factory: UniqueSelectionDispatcher.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(UniqueSelectionDispatcher, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], null, null);\n})();\n\n/**\n * Injection token for {@link _ViewRepeater}. This token is for use by Angular Material only.\n * @docs-private\n */\nconst _VIEW_REPEATER_STRATEGY = new InjectionToken('_ViewRepeater');\n\n/**\n * Generated bundle index. Do not edit.\n */\n\nexport { ArrayDataSource, DataSource, SelectionModel, UniqueSelectionDispatcher, _DisposeViewRepeaterStrategy, _RecycleViewRepeaterStrategy, _VIEW_REPEATER_STRATEGY, getMultipleValuesInSingleSelectionError, isDataSource };\n", "import { coerceNumberProperty, coerceElement } from '@angular/cdk/coercion';\nimport * as i0 from '@angular/core';\nimport { InjectionToken, forwardRef, Directive, Input, Injectable, Optional, Inject, inject, booleanAttribute, Component, ViewEncapsulation, ChangeDetectionStrategy, Output, ViewChild, SkipSelf, ElementRef, NgModule } from '@angular/core';\nimport { Subject, of, Observable, fromEvent, animationFrameScheduler, asapScheduler, Subscription, isObservable } from 'rxjs';\nimport { distinctUntilChanged, auditTime, filter, takeUntil, startWith, pairwise, switchMap, shareReplay } from 'rxjs/operators';\nimport * as i1 from '@angular/cdk/platform';\nimport { getRtlScrollAxisType, supportsScrollBehavior, Platform } from '@angular/cdk/platform';\nimport { DOCUMENT } from '@angular/common';\nimport * as i2 from '@angular/cdk/bidi';\nimport { BidiModule } from '@angular/cdk/bidi';\nimport * as i2$1 from '@angular/cdk/collections';\nimport { isDataSource, ArrayDataSource, _VIEW_REPEATER_STRATEGY, _RecycleViewRepeaterStrategy } from '@angular/cdk/collections';\n\n/** The injection token used to specify the virtual scrolling strategy. */\nconst _c0 = [\"contentWrapper\"];\nconst _c1 = [\"*\"];\nconst VIRTUAL_SCROLL_STRATEGY = new InjectionToken('VIRTUAL_SCROLL_STRATEGY');\n\n/** Virtual scrolling strategy for lists with items of known fixed size. */\nclass FixedSizeVirtualScrollStrategy {\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._scrolledIndexChange = new Subject();\n    /** @docs-private Implemented as part of VirtualScrollStrategy. */\n    this.scrolledIndexChange = this._scrolledIndexChange.pipe(distinctUntilChanged());\n    /** The attached viewport. */\n    this._viewport = null;\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. */\nclass CdkFixedSizeVirtualScroll {\n  constructor() {\n    this._itemSize = 20;\n    this._minBufferPx = 100;\n    this._maxBufferPx = 200;\n    /** The scroll strategy used by this directive. */\n    this._scrollStrategy = new FixedSizeVirtualScrollStrategy(this.itemSize, this.minBufferPx, this.maxBufferPx);\n  }\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  /**\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  /**\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  ngOnChanges() {\n    this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx);\n  }\n  static {\n    this.ɵfac = function CdkFixedSizeVirtualScroll_Factory(t) {\n      return new (t || CdkFixedSizeVirtualScroll)();\n    };\n  }\n  static {\n    this.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      standalone: true,\n      features: [i0.ɵɵProvidersFeature([{\n        provide: VIRTUAL_SCROLL_STRATEGY,\n        useFactory: _fixedSizeVirtualScrollStrategyFactory,\n        deps: [forwardRef(() => CdkFixedSizeVirtualScroll)]\n      }]), i0.ɵɵNgOnChangesFeature]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkFixedSizeVirtualScroll, [{\n    type: Directive,\n    args: [{\n      selector: 'cdk-virtual-scroll-viewport[itemSize]',\n      standalone: true,\n      providers: [{\n        provide: VIRTUAL_SCROLL_STRATEGY,\n        useFactory: _fixedSizeVirtualScrollStrategyFactory,\n        deps: [forwardRef(() => CdkFixedSizeVirtualScroll)]\n      }]\n    }]\n  }], null, {\n    itemSize: [{\n      type: Input\n    }],\n    minBufferPx: [{\n      type: Input\n    }],\n    maxBufferPx: [{\n      type: Input\n    }]\n  });\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 */\nclass ScrollDispatcher {\n  constructor(_ngZone, _platform, document) {\n    this._ngZone = _ngZone;\n    this._platform = _platform;\n    /** Subject for notifying that a registered scrollable reference element has been scrolled. */\n    this._scrolled = new Subject();\n    /** Keeps track of the global `scroll` and `resize` subscriptions. */\n    this._globalSubscription = null;\n    /** Keeps track of the amount of subscriptions to `scrolled`. Used for cleaning up afterwards. */\n    this._scrolledCount = 0;\n    /**\n     * Map of all the scrollable references that are registered with the service and their\n     * scroll event subscriptions.\n     */\n    this.scrollContainers = new Map();\n    this._document = document;\n  }\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._globalSubscription) {\n        this._addGlobalListener();\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._removeGlobalListener();\n        }\n      };\n    });\n  }\n  ngOnDestroy() {\n    this._removeGlobalListener();\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 => {\n      return !target || ancestors.indexOf(target) > -1;\n    }));\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  /** Use defaultView of injected document if available or fallback to global window reference */\n  _getWindow() {\n    return this._document.defaultView || window;\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  /** Sets up the global scroll listeners. */\n  _addGlobalListener() {\n    this._globalSubscription = this._ngZone.runOutsideAngular(() => {\n      const window = this._getWindow();\n      return fromEvent(window.document, 'scroll').subscribe(() => this._scrolled.next());\n    });\n  }\n  /** Cleans up the global scroll listener. */\n  _removeGlobalListener() {\n    if (this._globalSubscription) {\n      this._globalSubscription.unsubscribe();\n      this._globalSubscription = null;\n    }\n  }\n  static {\n    this.ɵfac = function ScrollDispatcher_Factory(t) {\n      return new (t || ScrollDispatcher)(i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i1.Platform), i0.ɵɵinject(DOCUMENT, 8));\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: ScrollDispatcher,\n      factory: ScrollDispatcher.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(ScrollDispatcher, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], () => [{\n    type: i0.NgZone\n  }, {\n    type: i1.Platform\n  }, {\n    type: undefined,\n    decorators: [{\n      type: Optional\n    }, {\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }], null);\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 */\nclass CdkScrollable {\n  constructor(elementRef, scrollDispatcher, ngZone, dir) {\n    this.elementRef = elementRef;\n    this.scrollDispatcher = scrollDispatcher;\n    this.ngZone = ngZone;\n    this.dir = dir;\n    this._destroyed = new Subject();\n    this._elementScrolled = new Observable(observer => this.ngZone.runOutsideAngular(() => fromEvent(this.elementRef.nativeElement, 'scroll').pipe(takeUntil(this._destroyed)).subscribe(observer)));\n  }\n  ngOnInit() {\n    this.scrollDispatcher.register(this);\n  }\n  ngOnDestroy() {\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() != 0 /* RtlScrollAxisType.NORMAL */) {\n      if (options.left != null) {\n        options.right = el.scrollWidth - el.clientWidth - options.left;\n      }\n      if (getRtlScrollAxisType() == 2 /* RtlScrollAxisType.INVERTED */) {\n        options.left = options.right;\n      } else if (getRtlScrollAxisType() == 1 /* 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() == 2 /* 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() == 1 /* 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 {\n    this.ɵfac = function CdkScrollable_Factory(t) {\n      return new (t || CdkScrollable)(i0.ɵɵdirectiveInject(i0.ElementRef), i0.ɵɵdirectiveInject(ScrollDispatcher), i0.ɵɵdirectiveInject(i0.NgZone), i0.ɵɵdirectiveInject(i2.Directionality, 8));\n    };\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkScrollable,\n      selectors: [[\"\", \"cdk-scrollable\", \"\"], [\"\", \"cdkScrollable\", \"\"]],\n      standalone: true\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkScrollable, [{\n    type: Directive,\n    args: [{\n      selector: '[cdk-scrollable], [cdkScrollable]',\n      standalone: true\n    }]\n  }], () => [{\n    type: i0.ElementRef\n  }, {\n    type: ScrollDispatcher\n  }, {\n    type: i0.NgZone\n  }, {\n    type: i2.Directionality,\n    decorators: [{\n      type: Optional\n    }]\n  }], null);\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 */\nclass ViewportRuler {\n  constructor(_platform, ngZone, document) {\n    this._platform = _platform;\n    /** Stream of viewport change events. */\n    this._change = new Subject();\n    /** Event listener that will be used to handle the viewport change events. */\n    this._changeListener = event => {\n      this._change.next(event);\n    };\n    this._document = document;\n    ngZone.runOutsideAngular(() => {\n      if (_platform.isBrowser) {\n        const window = this._getWindow();\n        // Note that bind the events ourselves, rather than going through something like RxJS's\n        // `fromEvent` so that we can ensure that they're bound outside of the NgZone.\n        window.addEventListener('resize', this._changeListener);\n        window.addEventListener('orientationchange', this._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    if (this._platform.isBrowser) {\n      const window = this._getWindow();\n      window.removeEventListener('resize', this._changeListener);\n      window.removeEventListener('orientationchange', this._changeListener);\n    }\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 ClientRect 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 {\n    this.ɵfac = function ViewportRuler_Factory(t) {\n      return new (t || ViewportRuler)(i0.ɵɵinject(i1.Platform), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(DOCUMENT, 8));\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: ViewportRuler,\n      factory: ViewportRuler.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(ViewportRuler, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], () => [{\n    type: i1.Platform\n  }, {\n    type: i0.NgZone\n  }, {\n    type: undefined,\n    decorators: [{\n      type: Optional\n    }, {\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }], null);\n})();\nconst VIRTUAL_SCROLLABLE = new InjectionToken('VIRTUAL_SCROLLABLE');\n/**\n * Extending the {@link CdkScrollable} to be used as scrolling container for virtual scrolling.\n */\nclass CdkVirtualScrollable extends CdkScrollable {\n  constructor(elementRef, scrollDispatcher, ngZone, dir) {\n    super(elementRef, scrollDispatcher, ngZone, dir);\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 {\n    this.ɵfac = function CdkVirtualScrollable_Factory(t) {\n      return new (t || CdkVirtualScrollable)(i0.ɵɵdirectiveInject(i0.ElementRef), i0.ɵɵdirectiveInject(ScrollDispatcher), i0.ɵɵdirectiveInject(i0.NgZone), i0.ɵɵdirectiveInject(i2.Directionality, 8));\n    };\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkVirtualScrollable,\n      features: [i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkVirtualScrollable, [{\n    type: Directive\n  }], () => [{\n    type: i0.ElementRef\n  }, {\n    type: ScrollDispatcher\n  }, {\n    type: i0.NgZone\n  }, {\n    type: i2.Directionality,\n    decorators: [{\n      type: Optional\n    }]\n  }], null);\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`. */\nclass CdkVirtualScrollViewport extends CdkVirtualScrollable {\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  constructor(elementRef, _changeDetectorRef, ngZone, _scrollStrategy, dir, scrollDispatcher, viewportRuler, scrollable) {\n    super(elementRef, scrollDispatcher, ngZone, dir);\n    this.elementRef = elementRef;\n    this._changeDetectorRef = _changeDetectorRef;\n    this._scrollStrategy = _scrollStrategy;\n    this.scrollable = scrollable;\n    this._platform = inject(Platform);\n    /** Emits when the viewport is detached from a CdkVirtualForOf. */\n    this._detachedSubject = new Subject();\n    /** Emits when the rendered range changes. */\n    this._renderedRangeSubject = new Subject();\n    this._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    this.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    this.scrolledIndexChange = new Observable(observer => this._scrollStrategy.scrolledIndexChange.subscribe(index => Promise.resolve().then(() => this.ngZone.run(() => observer.next(index)))));\n    /** A stream that emits whenever the rendered range changes. */\n    this.renderedRangeStream = this._renderedRangeSubject;\n    /**\n     * The total size of all content (in pixels), including content that is not currently rendered.\n     */\n    this._totalContentSize = 0;\n    /** A string representing the `style.width` property value to be used for the spacer element. */\n    this._totalContentWidth = '';\n    /** A string representing the `style.height` property value to be used for the spacer element. */\n    this._totalContentHeight = '';\n    /** The currently rendered range of indices. */\n    this._renderedRange = {\n      start: 0,\n      end: 0\n    };\n    /** The length of the data bound to this viewport (in number of items). */\n    this._dataLength = 0;\n    /** The size of the viewport (in pixels). */\n    this._viewportSize = 0;\n    /** The last rendered content offset that was set. */\n    this._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    this._renderedContentOffsetNeedsRewrite = false;\n    /** Whether there is a pending change detection cycle. */\n    this._isChangeDetectionPending = false;\n    /** A list of functions to run after the next change detection cycle. */\n    this._runAfterChangeDetection = [];\n    /** Subscription to changes in the viewport size. */\n    this._viewportChanges = Subscription.EMPTY;\n    if (!_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    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    this._isChangeDetectionPending = false;\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    const runAfterChangeDetection = this._runAfterChangeDetection;\n    this._runAfterChangeDetection = [];\n    for (const fn of runAfterChangeDetection) {\n      fn();\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 {\n    this.ɵfac = function CdkVirtualScrollViewport_Factory(t) {\n      return new (t || CdkVirtualScrollViewport)(i0.ɵɵdirectiveInject(i0.ElementRef), i0.ɵɵdirectiveInject(i0.ChangeDetectorRef), i0.ɵɵdirectiveInject(i0.NgZone), i0.ɵɵdirectiveInject(VIRTUAL_SCROLL_STRATEGY, 8), i0.ɵɵdirectiveInject(i2.Directionality, 8), i0.ɵɵdirectiveInject(ScrollDispatcher), i0.ɵɵdirectiveInject(ViewportRuler), i0.ɵɵdirectiveInject(VIRTUAL_SCROLLABLE, 8));\n    };\n  }\n  static {\n    this.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: [\"appendOnly\", \"appendOnly\", booleanAttribute]\n      },\n      outputs: {\n        scrolledIndexChange: \"scrolledIndexChange\"\n      },\n      standalone: true,\n      features: [i0.ɵɵProvidersFeature([{\n        provide: CdkScrollable,\n        useFactory: (virtualScrollable, viewport) => virtualScrollable || viewport,\n        deps: [[new Optional(), new Inject(VIRTUAL_SCROLLABLE)], CdkVirtualScrollViewport]\n      }]), i0.ɵɵInputTransformsFeature, i0.ɵɵInheritDefinitionFeature, i0.ɵɵStandaloneFeature],\n      ngContentSelectors: _c1,\n      decls: 4,\n      vars: 4,\n      consts: [[1, \"cdk-virtual-scroll-content-wrapper\"], [\"contentWrapper\", \"\"], [1, \"cdk-virtual-scroll-spacer\"]],\n      template: function CdkVirtualScrollViewport_Template(rf, ctx) {\n        if (rf & 1) {\n          i0.ɵɵprojectionDef();\n          i0.ɵɵelementStart(0, \"div\", 0, 1);\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;-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{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}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkVirtualScrollViewport, [{\n    type: Component,\n    args: [{\n      selector: 'cdk-virtual-scroll-viewport',\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      standalone: true,\n      providers: [{\n        provide: CdkScrollable,\n        useFactory: (virtualScrollable, viewport) => virtualScrollable || viewport,\n        deps: [[new Optional(), new Inject(VIRTUAL_SCROLLABLE)], CdkVirtualScrollViewport]\n      }],\n      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\",\n      styles: [\"cdk-virtual-scroll-viewport{display:block;position:relative;transform:translateZ(0)}.cdk-virtual-scrollable{overflow:auto;will-change:scroll-position;contain:strict;-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{height:1px;transform-origin:0 0;flex:0 0 auto}[dir=rtl] .cdk-virtual-scroll-spacer{transform-origin:100% 0}\"]\n    }]\n  }], () => [{\n    type: i0.ElementRef\n  }, {\n    type: i0.ChangeDetectorRef\n  }, {\n    type: i0.NgZone\n  }, {\n    type: undefined,\n    decorators: [{\n      type: Optional\n    }, {\n      type: Inject,\n      args: [VIRTUAL_SCROLL_STRATEGY]\n    }]\n  }, {\n    type: i2.Directionality,\n    decorators: [{\n      type: Optional\n    }]\n  }, {\n    type: ScrollDispatcher\n  }, {\n    type: ViewportRuler\n  }, {\n    type: CdkVirtualScrollable,\n    decorators: [{\n      type: Optional\n    }, {\n      type: Inject,\n      args: [VIRTUAL_SCROLLABLE]\n    }]\n  }], {\n    orientation: [{\n      type: Input\n    }],\n    appendOnly: [{\n      type: Input,\n      args: [{\n        transform: booleanAttribute\n      }]\n    }],\n    scrolledIndexChange: [{\n      type: Output\n    }],\n    _contentWrapper: [{\n      type: ViewChild,\n      args: ['contentWrapper', {\n        static: true\n      }]\n    }]\n  });\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 */\nclass CdkVirtualForOf {\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  /**\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  /** 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  constructor( /** The view container to add items to. */\n  _viewContainerRef, /** The template to use when stamping out new items. */\n  _template, /** The set of available differs. */\n  _differs, /** The strategy used to render items in the virtual scroll viewport. */\n  _viewRepeater, /** The virtual scrolling viewport that these items are being rendered in. */\n  _viewport, ngZone) {\n    this._viewContainerRef = _viewContainerRef;\n    this._template = _template;\n    this._differs = _differs;\n    this._viewRepeater = _viewRepeater;\n    this._viewport = _viewport;\n    /** Emits when the rendered view of the data changes. */\n    this.viewChange = new Subject();\n    /** Subject that emits when a new DataSource instance is given. */\n    this._dataSourceChanges = new Subject();\n    /** Emits whenever the data in the current DataSource changes. */\n    this.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    this._differ = null;\n    /** Whether the rendered data should be updated during the next ngDoCheck cycle. */\n    this._needsUpdate = false;\n    this._destroyed = new Subject();\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 {\n    this.ɵfac = function CdkVirtualForOf_Factory(t) {\n      return new (t || CdkVirtualForOf)(i0.ɵɵdirectiveInject(i0.ViewContainerRef), i0.ɵɵdirectiveInject(i0.TemplateRef), i0.ɵɵdirectiveInject(i0.IterableDiffers), i0.ɵɵdirectiveInject(_VIEW_REPEATER_STRATEGY), i0.ɵɵdirectiveInject(CdkVirtualScrollViewport, 4), i0.ɵɵdirectiveInject(i0.NgZone));\n    };\n  }\n  static {\n    this.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      standalone: true,\n      features: [i0.ɵɵProvidersFeature([{\n        provide: _VIEW_REPEATER_STRATEGY,\n        useClass: _RecycleViewRepeaterStrategy\n      }])]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkVirtualForOf, [{\n    type: Directive,\n    args: [{\n      selector: '[cdkVirtualFor][cdkVirtualForOf]',\n      providers: [{\n        provide: _VIEW_REPEATER_STRATEGY,\n        useClass: _RecycleViewRepeaterStrategy\n      }],\n      standalone: true\n    }]\n  }], () => [{\n    type: i0.ViewContainerRef\n  }, {\n    type: i0.TemplateRef\n  }, {\n    type: i0.IterableDiffers\n  }, {\n    type: i2$1._RecycleViewRepeaterStrategy,\n    decorators: [{\n      type: Inject,\n      args: [_VIEW_REPEATER_STRATEGY]\n    }]\n  }, {\n    type: CdkVirtualScrollViewport,\n    decorators: [{\n      type: SkipSelf\n    }]\n  }, {\n    type: i0.NgZone\n  }], {\n    cdkVirtualForOf: [{\n      type: Input\n    }],\n    cdkVirtualForTrackBy: [{\n      type: Input\n    }],\n    cdkVirtualForTemplate: [{\n      type: Input\n    }],\n    cdkVirtualForTemplateCacheSize: [{\n      type: Input\n    }]\n  });\n})();\n\n/**\n * Provides a virtual scrollable for the element it is attached to.\n */\nclass CdkVirtualScrollableElement extends CdkVirtualScrollable {\n  constructor(elementRef, scrollDispatcher, ngZone, dir) {\n    super(elementRef, scrollDispatcher, ngZone, dir);\n  }\n  measureBoundingClientRectWithScrollOffset(from) {\n    return this.getElementRef().nativeElement.getBoundingClientRect()[from] - this.measureScrollOffset(from);\n  }\n  static {\n    this.ɵfac = function CdkVirtualScrollableElement_Factory(t) {\n      return new (t || CdkVirtualScrollableElement)(i0.ɵɵdirectiveInject(i0.ElementRef), i0.ɵɵdirectiveInject(ScrollDispatcher), i0.ɵɵdirectiveInject(i0.NgZone), i0.ɵɵdirectiveInject(i2.Directionality, 8));\n    };\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkVirtualScrollableElement,\n      selectors: [[\"\", \"cdkVirtualScrollingElement\", \"\"]],\n      hostAttrs: [1, \"cdk-virtual-scrollable\"],\n      standalone: true,\n      features: [i0.ɵɵProvidersFeature([{\n        provide: VIRTUAL_SCROLLABLE,\n        useExisting: CdkVirtualScrollableElement\n      }]), i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkVirtualScrollableElement, [{\n    type: Directive,\n    args: [{\n      selector: '[cdkVirtualScrollingElement]',\n      providers: [{\n        provide: VIRTUAL_SCROLLABLE,\n        useExisting: CdkVirtualScrollableElement\n      }],\n      standalone: true,\n      host: {\n        'class': 'cdk-virtual-scrollable'\n      }\n    }]\n  }], () => [{\n    type: i0.ElementRef\n  }, {\n    type: ScrollDispatcher\n  }, {\n    type: i0.NgZone\n  }, {\n    type: i2.Directionality,\n    decorators: [{\n      type: Optional\n    }]\n  }], null);\n})();\n\n/**\n * Provides as virtual scrollable for the global / window scrollbar.\n */\nclass CdkVirtualScrollableWindow extends CdkVirtualScrollable {\n  constructor(scrollDispatcher, ngZone, dir) {\n    super(new ElementRef(document.documentElement), scrollDispatcher, ngZone, dir);\n    this._elementScrolled = new Observable(observer => this.ngZone.runOutsideAngular(() => fromEvent(document, 'scroll').pipe(takeUntil(this._destroyed)).subscribe(observer)));\n  }\n  measureBoundingClientRectWithScrollOffset(from) {\n    return this.getElementRef().nativeElement.getBoundingClientRect()[from];\n  }\n  static {\n    this.ɵfac = function CdkVirtualScrollableWindow_Factory(t) {\n      return new (t || CdkVirtualScrollableWindow)(i0.ɵɵdirectiveInject(ScrollDispatcher), i0.ɵɵdirectiveInject(i0.NgZone), i0.ɵɵdirectiveInject(i2.Directionality, 8));\n    };\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkVirtualScrollableWindow,\n      selectors: [[\"cdk-virtual-scroll-viewport\", \"scrollWindow\", \"\"]],\n      standalone: true,\n      features: [i0.ɵɵProvidersFeature([{\n        provide: VIRTUAL_SCROLLABLE,\n        useExisting: CdkVirtualScrollableWindow\n      }]), i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkVirtualScrollableWindow, [{\n    type: Directive,\n    args: [{\n      selector: 'cdk-virtual-scroll-viewport[scrollWindow]',\n      providers: [{\n        provide: VIRTUAL_SCROLLABLE,\n        useExisting: CdkVirtualScrollableWindow\n      }],\n      standalone: true\n    }]\n  }], () => [{\n    type: ScrollDispatcher\n  }, {\n    type: i0.NgZone\n  }, {\n    type: i2.Directionality,\n    decorators: [{\n      type: Optional\n    }]\n  }], null);\n})();\nclass CdkScrollableModule {\n  static {\n    this.ɵfac = function CdkScrollableModule_Factory(t) {\n      return new (t || CdkScrollableModule)();\n    };\n  }\n  static {\n    this.ɵmod = /* @__PURE__ */i0.ɵɵdefineNgModule({\n      type: CdkScrollableModule,\n      imports: [CdkScrollable],\n      exports: [CdkScrollable]\n    });\n  }\n  static {\n    this.ɵinj = /* @__PURE__ */i0.ɵɵdefineInjector({});\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkScrollableModule, [{\n    type: NgModule,\n    args: [{\n      exports: [CdkScrollable],\n      imports: [CdkScrollable]\n    }]\n  }], null, null);\n})();\n/**\n * @docs-primary-export\n */\nclass ScrollingModule {\n  static {\n    this.ɵfac = function ScrollingModule_Factory(t) {\n      return new (t || ScrollingModule)();\n    };\n  }\n  static {\n    this.ɵmod = /* @__PURE__ */i0.ɵɵdefineNgModule({\n      type: ScrollingModule,\n      imports: [BidiModule, CdkScrollableModule, CdkVirtualScrollViewport, CdkFixedSizeVirtualScroll, CdkVirtualForOf, CdkVirtualScrollableWindow, CdkVirtualScrollableElement],\n      exports: [BidiModule, CdkScrollableModule, CdkFixedSizeVirtualScroll, CdkVirtualForOf, CdkVirtualScrollViewport, CdkVirtualScrollableWindow, CdkVirtualScrollableElement]\n    });\n  }\n  static {\n    this.ɵinj = /* @__PURE__ */i0.ɵɵdefineInjector({\n      imports: [BidiModule, CdkScrollableModule, BidiModule, CdkScrollableModule]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(ScrollingModule, [{\n    type: NgModule,\n    args: [{\n      imports: [BidiModule, CdkScrollableModule, CdkVirtualScrollViewport, CdkFixedSizeVirtualScroll, CdkVirtualForOf, CdkVirtualScrollableWindow, CdkVirtualScrollableElement],\n      exports: [BidiModule, CdkScrollableModule, CdkFixedSizeVirtualScroll, CdkVirtualForOf, CdkVirtualScrollViewport, CdkVirtualScrollableWindow, CdkVirtualScrollableElement]\n    }]\n  }], null, null);\n})();\n\n/**\n * Generated bundle index. Do not edit.\n */\n\nexport { CdkFixedSizeVirtualScroll, CdkScrollable, CdkScrollableModule, CdkVirtualForOf, CdkVirtualScrollViewport, CdkVirtualScrollable, CdkVirtualScrollableElement, CdkVirtualScrollableWindow, DEFAULT_RESIZE_TIME, DEFAULT_SCROLL_TIME, FixedSizeVirtualScrollStrategy, ScrollDispatcher, ScrollingModule, VIRTUAL_SCROLLABLE, VIRTUAL_SCROLL_STRATEGY, ViewportRuler, _fixedSizeVirtualScrollStrategyFactory };\n", "import * as i0 from '@angular/core';\nimport { ElementRef, Injector, Directive, EventEmitter, Inject, Output, NgModule } from '@angular/core';\nimport { DOCUMENT } from '@angular/common';\n\n/**\n * Throws an exception when attempting to attach a null portal to a host.\n * @docs-private\n */\nfunction throwNullPortalError() {\n  throw Error('Must provide a portal to attach');\n}\n/**\n * Throws an exception when attempting to attach a portal to a host that is already attached.\n * @docs-private\n */\nfunction throwPortalAlreadyAttachedError() {\n  throw Error('Host already has a portal attached');\n}\n/**\n * Throws an exception when attempting to attach a portal to an already-disposed host.\n * @docs-private\n */\nfunction throwPortalOutletAlreadyDisposedError() {\n  throw Error('This PortalOutlet has already been disposed');\n}\n/**\n * Throws an exception when attempting to attach an unknown portal type.\n * @docs-private\n */\nfunction throwUnknownPortalTypeError() {\n  throw Error('Attempting to attach an unknown Portal type. BasePortalOutlet accepts either ' + 'a ComponentPortal or a TemplatePortal.');\n}\n/**\n * Throws an exception when attempting to attach a portal to a null host.\n * @docs-private\n */\nfunction throwNullPortalOutletError() {\n  throw Error('Attempting to attach a portal to a null PortalOutlet');\n}\n/**\n * Throws an exception when attempting to detach a portal that is not attached.\n * @docs-private\n */\nfunction throwNoPortalAttachedError() {\n  throw Error('Attempting to detach a portal that is not attached to a host');\n}\n\n/**\n * A `Portal` is something that you want to render somewhere else.\n * It can be attach to / detached from a `PortalOutlet`.\n */\nclass Portal {\n  /** Attach this portal to a host. */\n  attach(host) {\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      if (host == null) {\n        throwNullPortalOutletError();\n      }\n      if (host.hasAttached()) {\n        throwPortalAlreadyAttachedError();\n      }\n    }\n    this._attachedHost = host;\n    return host.attach(this);\n  }\n  /** Detach this portal from its host */\n  detach() {\n    let host = this._attachedHost;\n    if (host != null) {\n      this._attachedHost = null;\n      host.detach();\n    } else if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      throwNoPortalAttachedError();\n    }\n  }\n  /** Whether this portal is attached to a host. */\n  get isAttached() {\n    return this._attachedHost != null;\n  }\n  /**\n   * Sets the PortalOutlet reference without performing `attach()`. This is used directly by\n   * the PortalOutlet when it is performing an `attach()` or `detach()`.\n   */\n  setAttachedHost(host) {\n    this._attachedHost = host;\n  }\n}\n/**\n * A `ComponentPortal` is a portal that instantiates some Component upon attachment.\n */\nclass ComponentPortal extends Portal {\n  constructor(component, viewContainerRef, injector, componentFactoryResolver, projectableNodes) {\n    super();\n    this.component = component;\n    this.viewContainerRef = viewContainerRef;\n    this.injector = injector;\n    this.componentFactoryResolver = componentFactoryResolver;\n    this.projectableNodes = projectableNodes;\n  }\n}\n/**\n * A `TemplatePortal` is a portal that represents some embedded template (TemplateRef).\n */\nclass TemplatePortal extends Portal {\n  constructor( /** The embedded template that will be used to instantiate an embedded View in the host. */\n  templateRef, /** Reference to the ViewContainer into which the template will be stamped out. */\n  viewContainerRef, /** Contextual data to be passed in to the embedded view. */\n  context, /** The injector to use for the embedded view. */\n  injector) {\n    super();\n    this.templateRef = templateRef;\n    this.viewContainerRef = viewContainerRef;\n    this.context = context;\n    this.injector = injector;\n  }\n  get origin() {\n    return this.templateRef.elementRef;\n  }\n  /**\n   * Attach the portal to the provided `PortalOutlet`.\n   * When a context is provided it will override the `context` property of the `TemplatePortal`\n   * instance.\n   */\n  attach(host, context = this.context) {\n    this.context = context;\n    return super.attach(host);\n  }\n  detach() {\n    this.context = undefined;\n    return super.detach();\n  }\n}\n/**\n * A `DomPortal` is a portal whose DOM element will be taken from its current position\n * in the DOM and moved into a portal outlet, when it is attached. On detach, the content\n * will be restored to its original position.\n */\nclass DomPortal extends Portal {\n  constructor(element) {\n    super();\n    this.element = element instanceof ElementRef ? element.nativeElement : element;\n  }\n}\n/**\n * Partial implementation of PortalOutlet that handles attaching\n * ComponentPortal and TemplatePortal.\n */\nclass BasePortalOutlet {\n  constructor() {\n    /** Whether this host has already been permanently disposed. */\n    this._isDisposed = false;\n    // @breaking-change 10.0.0 `attachDomPortal` to become a required abstract method.\n    this.attachDomPortal = null;\n  }\n  /** Whether this host has an attached portal. */\n  hasAttached() {\n    return !!this._attachedPortal;\n  }\n  /** Attaches a portal. */\n  attach(portal) {\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      if (!portal) {\n        throwNullPortalError();\n      }\n      if (this.hasAttached()) {\n        throwPortalAlreadyAttachedError();\n      }\n      if (this._isDisposed) {\n        throwPortalOutletAlreadyDisposedError();\n      }\n    }\n    if (portal instanceof ComponentPortal) {\n      this._attachedPortal = portal;\n      return this.attachComponentPortal(portal);\n    } else if (portal instanceof TemplatePortal) {\n      this._attachedPortal = portal;\n      return this.attachTemplatePortal(portal);\n      // @breaking-change 10.0.0 remove null check for `this.attachDomPortal`.\n    } else if (this.attachDomPortal && portal instanceof DomPortal) {\n      this._attachedPortal = portal;\n      return this.attachDomPortal(portal);\n    }\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      throwUnknownPortalTypeError();\n    }\n  }\n  /** Detaches a previously attached portal. */\n  detach() {\n    if (this._attachedPortal) {\n      this._attachedPortal.setAttachedHost(null);\n      this._attachedPortal = null;\n    }\n    this._invokeDisposeFn();\n  }\n  /** Permanently dispose of this portal host. */\n  dispose() {\n    if (this.hasAttached()) {\n      this.detach();\n    }\n    this._invokeDisposeFn();\n    this._isDisposed = true;\n  }\n  /** @docs-private */\n  setDisposeFn(fn) {\n    this._disposeFn = fn;\n  }\n  _invokeDisposeFn() {\n    if (this._disposeFn) {\n      this._disposeFn();\n      this._disposeFn = null;\n    }\n  }\n}\n/**\n * @deprecated Use `BasePortalOutlet` instead.\n * @breaking-change 9.0.0\n */\nclass BasePortalHost extends BasePortalOutlet {}\n\n/**\n * A PortalOutlet for attaching portals to an arbitrary DOM element outside of the Angular\n * application context.\n */\nclass DomPortalOutlet extends BasePortalOutlet {\n  /**\n   * @param outletElement Element into which the content is projected.\n   * @param _componentFactoryResolver Used to resolve the component factory.\n   *   Only required when attaching component portals.\n   * @param _appRef Reference to the application. Only used in component portals when there\n   *   is no `ViewContainerRef` available.\n   * @param _defaultInjector Injector to use as a fallback when the portal being attached doesn't\n   *   have one. Only used for component portals.\n   * @param _document Reference to the document. Used when attaching a DOM portal. Will eventually\n   *   become a required parameter.\n   */\n  constructor( /** Element into which the content is projected. */\n  outletElement, _componentFactoryResolver, _appRef, _defaultInjector,\n  /**\n   * @deprecated `_document` Parameter to be made required.\n   * @breaking-change 10.0.0\n   */\n  _document) {\n    super();\n    this.outletElement = outletElement;\n    this._componentFactoryResolver = _componentFactoryResolver;\n    this._appRef = _appRef;\n    this._defaultInjector = _defaultInjector;\n    /**\n     * Attaches a DOM portal by transferring its content into the outlet.\n     * @param portal Portal to be attached.\n     * @deprecated To be turned into a method.\n     * @breaking-change 10.0.0\n     */\n    this.attachDomPortal = portal => {\n      // @breaking-change 10.0.0 Remove check and error once the\n      // `_document` constructor parameter is required.\n      if (!this._document && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n        throw Error('Cannot attach DOM portal without _document constructor parameter');\n      }\n      const element = portal.element;\n      if (!element.parentNode && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n        throw Error('DOM portal content must be attached to a parent node.');\n      }\n      // Anchor used to save the element's previous position so\n      // that we can restore it when the portal is detached.\n      const anchorNode = this._document.createComment('dom-portal');\n      element.parentNode.insertBefore(anchorNode, element);\n      this.outletElement.appendChild(element);\n      this._attachedPortal = portal;\n      super.setDisposeFn(() => {\n        // We can't use `replaceWith` here because IE doesn't support it.\n        if (anchorNode.parentNode) {\n          anchorNode.parentNode.replaceChild(element, anchorNode);\n        }\n      });\n    };\n    this._document = _document;\n  }\n  /**\n   * Attach the given ComponentPortal to DOM element using the ComponentFactoryResolver.\n   * @param portal Portal to be attached\n   * @returns Reference to the created component.\n   */\n  attachComponentPortal(portal) {\n    const resolver = portal.componentFactoryResolver || this._componentFactoryResolver;\n    if ((typeof ngDevMode === 'undefined' || ngDevMode) && !resolver) {\n      throw Error('Cannot attach component portal to outlet without a ComponentFactoryResolver.');\n    }\n    const componentFactory = resolver.resolveComponentFactory(portal.component);\n    let componentRef;\n    // If the portal specifies a ViewContainerRef, we will use that as the attachment point\n    // for the component (in terms of Angular's component tree, not rendering).\n    // When the ViewContainerRef is missing, we use the factory to create the component directly\n    // and then manually attach the view to the application.\n    if (portal.viewContainerRef) {\n      componentRef = portal.viewContainerRef.createComponent(componentFactory, portal.viewContainerRef.length, portal.injector || portal.viewContainerRef.injector, portal.projectableNodes || undefined);\n      this.setDisposeFn(() => componentRef.destroy());\n    } else {\n      if ((typeof ngDevMode === 'undefined' || ngDevMode) && !this._appRef) {\n        throw Error('Cannot attach component portal to outlet without an ApplicationRef.');\n      }\n      componentRef = componentFactory.create(portal.injector || this._defaultInjector || Injector.NULL);\n      this._appRef.attachView(componentRef.hostView);\n      this.setDisposeFn(() => {\n        // Verify that the ApplicationRef has registered views before trying to detach a host view.\n        // This check also protects the `detachView` from being called on a destroyed ApplicationRef.\n        if (this._appRef.viewCount > 0) {\n          this._appRef.detachView(componentRef.hostView);\n        }\n        componentRef.destroy();\n      });\n    }\n    // At this point the component has been instantiated, so we move it to the location in the DOM\n    // where we want it to be rendered.\n    this.outletElement.appendChild(this._getComponentRootNode(componentRef));\n    this._attachedPortal = portal;\n    return componentRef;\n  }\n  /**\n   * Attaches a template portal to the DOM as an embedded view.\n   * @param portal Portal to be attached.\n   * @returns Reference to the created embedded view.\n   */\n  attachTemplatePortal(portal) {\n    let viewContainer = portal.viewContainerRef;\n    let viewRef = viewContainer.createEmbeddedView(portal.templateRef, portal.context, {\n      injector: portal.injector\n    });\n    // The method `createEmbeddedView` will add the view as a child of the viewContainer.\n    // But for the DomPortalOutlet the view can be added everywhere in the DOM\n    // (e.g Overlay Container) To move the view to the specified host element. We just\n    // re-append the existing root nodes.\n    viewRef.rootNodes.forEach(rootNode => this.outletElement.appendChild(rootNode));\n    // Note that we want to detect changes after the nodes have been moved so that\n    // any directives inside the portal that are looking at the DOM inside a lifecycle\n    // hook won't be invoked too early.\n    viewRef.detectChanges();\n    this.setDisposeFn(() => {\n      let index = viewContainer.indexOf(viewRef);\n      if (index !== -1) {\n        viewContainer.remove(index);\n      }\n    });\n    this._attachedPortal = portal;\n    // TODO(jelbourn): Return locals from view.\n    return viewRef;\n  }\n  /**\n   * Clears out a portal from the DOM.\n   */\n  dispose() {\n    super.dispose();\n    this.outletElement.remove();\n  }\n  /** Gets the root HTMLElement for an instantiated component. */\n  _getComponentRootNode(componentRef) {\n    return componentRef.hostView.rootNodes[0];\n  }\n}\n/**\n * @deprecated Use `DomPortalOutlet` instead.\n * @breaking-change 9.0.0\n */\nclass DomPortalHost extends DomPortalOutlet {}\n\n/**\n * Directive version of a `TemplatePortal`. Because the directive *is* a TemplatePortal,\n * the directive instance itself can be attached to a host, enabling declarative use of portals.\n */\nclass CdkPortal extends TemplatePortal {\n  constructor(templateRef, viewContainerRef) {\n    super(templateRef, viewContainerRef);\n  }\n  static {\n    this.ɵfac = function CdkPortal_Factory(t) {\n      return new (t || CdkPortal)(i0.ɵɵdirectiveInject(i0.TemplateRef), i0.ɵɵdirectiveInject(i0.ViewContainerRef));\n    };\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkPortal,\n      selectors: [[\"\", \"cdkPortal\", \"\"]],\n      exportAs: [\"cdkPortal\"],\n      features: [i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkPortal, [{\n    type: Directive,\n    args: [{\n      selector: '[cdkPortal]',\n      exportAs: 'cdkPortal'\n    }]\n  }], () => [{\n    type: i0.TemplateRef\n  }, {\n    type: i0.ViewContainerRef\n  }], null);\n})();\n/**\n * @deprecated Use `CdkPortal` instead.\n * @breaking-change 9.0.0\n */\nclass TemplatePortalDirective extends CdkPortal {\n  static {\n    this.ɵfac = /* @__PURE__ */(() => {\n      let ɵTemplatePortalDirective_BaseFactory;\n      return function TemplatePortalDirective_Factory(t) {\n        return (ɵTemplatePortalDirective_BaseFactory || (ɵTemplatePortalDirective_BaseFactory = i0.ɵɵgetInheritedFactory(TemplatePortalDirective)))(t || TemplatePortalDirective);\n      };\n    })();\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: TemplatePortalDirective,\n      selectors: [[\"\", \"cdk-portal\", \"\"], [\"\", \"portal\", \"\"]],\n      exportAs: [\"cdkPortal\"],\n      features: [i0.ɵɵProvidersFeature([{\n        provide: CdkPortal,\n        useExisting: TemplatePortalDirective\n      }]), i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(TemplatePortalDirective, [{\n    type: Directive,\n    args: [{\n      selector: '[cdk-portal], [portal]',\n      exportAs: 'cdkPortal',\n      providers: [{\n        provide: CdkPortal,\n        useExisting: TemplatePortalDirective\n      }]\n    }]\n  }], null, null);\n})();\n/**\n * Directive version of a PortalOutlet. Because the directive *is* a PortalOutlet, portals can be\n * directly attached to it, enabling declarative use.\n *\n * Usage:\n * `<ng-template [cdkPortalOutlet]=\"greeting\"></ng-template>`\n */\nclass CdkPortalOutlet extends BasePortalOutlet {\n  constructor(_componentFactoryResolver, _viewContainerRef,\n  /**\n   * @deprecated `_document` parameter to be made required.\n   * @breaking-change 9.0.0\n   */\n  _document) {\n    super();\n    this._componentFactoryResolver = _componentFactoryResolver;\n    this._viewContainerRef = _viewContainerRef;\n    /** Whether the portal component is initialized. */\n    this._isInitialized = false;\n    /** Emits when a portal is attached to the outlet. */\n    this.attached = new EventEmitter();\n    /**\n     * Attaches the given DomPortal to this PortalHost by moving all of the portal content into it.\n     * @param portal Portal to be attached.\n     * @deprecated To be turned into a method.\n     * @breaking-change 10.0.0\n     */\n    this.attachDomPortal = portal => {\n      // @breaking-change 9.0.0 Remove check and error once the\n      // `_document` constructor parameter is required.\n      if (!this._document && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n        throw Error('Cannot attach DOM portal without _document constructor parameter');\n      }\n      const element = portal.element;\n      if (!element.parentNode && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n        throw Error('DOM portal content must be attached to a parent node.');\n      }\n      // Anchor used to save the element's previous position so\n      // that we can restore it when the portal is detached.\n      const anchorNode = this._document.createComment('dom-portal');\n      portal.setAttachedHost(this);\n      element.parentNode.insertBefore(anchorNode, element);\n      this._getRootNode().appendChild(element);\n      this._attachedPortal = portal;\n      super.setDisposeFn(() => {\n        if (anchorNode.parentNode) {\n          anchorNode.parentNode.replaceChild(element, anchorNode);\n        }\n      });\n    };\n    this._document = _document;\n  }\n  /** Portal associated with the Portal outlet. */\n  get portal() {\n    return this._attachedPortal;\n  }\n  set portal(portal) {\n    // Ignore the cases where the `portal` is set to a falsy value before the lifecycle hooks have\n    // run. This handles the cases where the user might do something like `<div cdkPortalOutlet>`\n    // and attach a portal programmatically in the parent component. When Angular does the first CD\n    // round, it will fire the setter with empty string, causing the user's content to be cleared.\n    if (this.hasAttached() && !portal && !this._isInitialized) {\n      return;\n    }\n    if (this.hasAttached()) {\n      super.detach();\n    }\n    if (portal) {\n      super.attach(portal);\n    }\n    this._attachedPortal = portal || null;\n  }\n  /** Component or view reference that is attached to the portal. */\n  get attachedRef() {\n    return this._attachedRef;\n  }\n  ngOnInit() {\n    this._isInitialized = true;\n  }\n  ngOnDestroy() {\n    super.dispose();\n    this._attachedRef = this._attachedPortal = null;\n  }\n  /**\n   * Attach the given ComponentPortal to this PortalOutlet using the ComponentFactoryResolver.\n   *\n   * @param portal Portal to be attached to the portal outlet.\n   * @returns Reference to the created component.\n   */\n  attachComponentPortal(portal) {\n    portal.setAttachedHost(this);\n    // If the portal specifies an origin, use that as the logical location of the component\n    // in the application tree. Otherwise use the location of this PortalOutlet.\n    const viewContainerRef = portal.viewContainerRef != null ? portal.viewContainerRef : this._viewContainerRef;\n    const resolver = portal.componentFactoryResolver || this._componentFactoryResolver;\n    const componentFactory = resolver.resolveComponentFactory(portal.component);\n    const ref = viewContainerRef.createComponent(componentFactory, viewContainerRef.length, portal.injector || viewContainerRef.injector, portal.projectableNodes || undefined);\n    // If we're using a view container that's different from the injected one (e.g. when the portal\n    // specifies its own) we need to move the component into the outlet, otherwise it'll be rendered\n    // inside of the alternate view container.\n    if (viewContainerRef !== this._viewContainerRef) {\n      this._getRootNode().appendChild(ref.hostView.rootNodes[0]);\n    }\n    super.setDisposeFn(() => ref.destroy());\n    this._attachedPortal = portal;\n    this._attachedRef = ref;\n    this.attached.emit(ref);\n    return ref;\n  }\n  /**\n   * Attach the given TemplatePortal to this PortalHost as an embedded View.\n   * @param portal Portal to be attached.\n   * @returns Reference to the created embedded view.\n   */\n  attachTemplatePortal(portal) {\n    portal.setAttachedHost(this);\n    const viewRef = this._viewContainerRef.createEmbeddedView(portal.templateRef, portal.context, {\n      injector: portal.injector\n    });\n    super.setDisposeFn(() => this._viewContainerRef.clear());\n    this._attachedPortal = portal;\n    this._attachedRef = viewRef;\n    this.attached.emit(viewRef);\n    return viewRef;\n  }\n  /** Gets the root node of the portal outlet. */\n  _getRootNode() {\n    const nativeElement = this._viewContainerRef.element.nativeElement;\n    // The directive could be set on a template which will result in a comment\n    // node being the root. Use the comment's parent node if that is the case.\n    return nativeElement.nodeType === nativeElement.ELEMENT_NODE ? nativeElement : nativeElement.parentNode;\n  }\n  static {\n    this.ɵfac = function CdkPortalOutlet_Factory(t) {\n      return new (t || CdkPortalOutlet)(i0.ɵɵdirectiveInject(i0.ComponentFactoryResolver), i0.ɵɵdirectiveInject(i0.ViewContainerRef), i0.ɵɵdirectiveInject(DOCUMENT));\n    };\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkPortalOutlet,\n      selectors: [[\"\", \"cdkPortalOutlet\", \"\"]],\n      inputs: {\n        portal: [\"cdkPortalOutlet\", \"portal\"]\n      },\n      outputs: {\n        attached: \"attached\"\n      },\n      exportAs: [\"cdkPortalOutlet\"],\n      features: [i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkPortalOutlet, [{\n    type: Directive,\n    args: [{\n      selector: '[cdkPortalOutlet]',\n      exportAs: 'cdkPortalOutlet',\n      inputs: ['portal: cdkPortalOutlet']\n    }]\n  }], () => [{\n    type: i0.ComponentFactoryResolver\n  }, {\n    type: i0.ViewContainerRef\n  }, {\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }], {\n    attached: [{\n      type: Output\n    }]\n  });\n})();\n/**\n * @deprecated Use `CdkPortalOutlet` instead.\n * @breaking-change 9.0.0\n */\nclass PortalHostDirective extends CdkPortalOutlet {\n  static {\n    this.ɵfac = /* @__PURE__ */(() => {\n      let ɵPortalHostDirective_BaseFactory;\n      return function PortalHostDirective_Factory(t) {\n        return (ɵPortalHostDirective_BaseFactory || (ɵPortalHostDirective_BaseFactory = i0.ɵɵgetInheritedFactory(PortalHostDirective)))(t || PortalHostDirective);\n      };\n    })();\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: PortalHostDirective,\n      selectors: [[\"\", \"cdkPortalHost\", \"\"], [\"\", \"portalHost\", \"\"]],\n      inputs: {\n        portal: [\"cdkPortalHost\", \"portal\"]\n      },\n      exportAs: [\"cdkPortalHost\"],\n      features: [i0.ɵɵProvidersFeature([{\n        provide: CdkPortalOutlet,\n        useExisting: PortalHostDirective\n      }]), i0.ɵɵInheritDefinitionFeature]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(PortalHostDirective, [{\n    type: Directive,\n    args: [{\n      selector: '[cdkPortalHost], [portalHost]',\n      exportAs: 'cdkPortalHost',\n      inputs: ['portal: cdkPortalHost'],\n      providers: [{\n        provide: CdkPortalOutlet,\n        useExisting: PortalHostDirective\n      }]\n    }]\n  }], null, null);\n})();\nclass PortalModule {\n  static {\n    this.ɵfac = function PortalModule_Factory(t) {\n      return new (t || PortalModule)();\n    };\n  }\n  static {\n    this.ɵmod = /* @__PURE__ */i0.ɵɵdefineNgModule({\n      type: PortalModule,\n      declarations: [CdkPortal, CdkPortalOutlet, TemplatePortalDirective, PortalHostDirective],\n      exports: [CdkPortal, CdkPortalOutlet, TemplatePortalDirective, PortalHostDirective]\n    });\n  }\n  static {\n    this.ɵinj = /* @__PURE__ */i0.ɵɵdefineInjector({});\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(PortalModule, [{\n    type: NgModule,\n    args: [{\n      exports: [CdkPortal, CdkPortalOutlet, TemplatePortalDirective, PortalHostDirective],\n      declarations: [CdkPortal, CdkPortalOutlet, TemplatePortalDirective, PortalHostDirective]\n    }]\n  }], null, null);\n})();\n\n/**\n * Custom injector to be used when providing custom\n * injection tokens to components inside a portal.\n * @docs-private\n * @deprecated Use `Injector.create` instead.\n * @breaking-change 11.0.0\n */\nclass PortalInjector {\n  constructor(_parentInjector, _customTokens) {\n    this._parentInjector = _parentInjector;\n    this._customTokens = _customTokens;\n  }\n  get(token, notFoundValue) {\n    const value = this._customTokens.get(token);\n    if (typeof value !== 'undefined') {\n      return value;\n    }\n    return this._parentInjector.get(token, notFoundValue);\n  }\n}\n\n/**\n * Generated bundle index. Do not edit.\n */\n\nexport { BasePortalHost, BasePortalOutlet, CdkPortal, CdkPortalOutlet, ComponentPortal, DomPortal, DomPortalHost, DomPortalOutlet, Portal, PortalHostDirective, PortalInjector, PortalModule, TemplatePortal, TemplatePortalDirective };\n", "import * as i1 from '@angular/cdk/scrolling';\nimport { ScrollingModule } from '@angular/cdk/scrolling';\nexport { CdkScrollable, ScrollDispatcher, ViewportRuler } from '@angular/cdk/scrolling';\nimport * as i6 from '@angular/common';\nimport { DOCUMENT } from '@angular/common';\nimport * as i0 from '@angular/core';\nimport { Injectable, Inject, Optional, ElementRef, ApplicationRef, ANIMATION_MODULE_TYPE, InjectionToken, inject, Directive, EventEmitter, booleanAttribute, Input, Output, NgModule } from '@angular/core';\nimport { coerceCssPixelValue, coerceArray } from '@angular/cdk/coercion';\nimport * as i1$1 from '@angular/cdk/platform';\nimport { supportsScrollBehavior, _getEventTarget, _isTestEnvironment } from '@angular/cdk/platform';\nimport { filter, take, takeUntil, takeWhile } from 'rxjs/operators';\nimport * as i5 from '@angular/cdk/bidi';\nimport { BidiModule } from '@angular/cdk/bidi';\nimport { DomPortalOutlet, TemplatePortal, PortalModule } from '@angular/cdk/portal';\nimport { Subject, Subscription, merge } from 'rxjs';\nimport { ESCAPE, hasModifierKey } from '@angular/cdk/keycodes';\nconst scrollBehaviorSupported = supportsScrollBehavior();\n/**\n * Strategy that will prevent the user from scrolling while the overlay is visible.\n */\nclass BlockScrollStrategy {\n  constructor(_viewportRuler, document) {\n    this._viewportRuler = _viewportRuler;\n    this._previousHTMLStyles = {\n      top: '',\n      left: ''\n    };\n    this._isEnabled = false;\n    this._document = document;\n  }\n  /** Attaches this scroll strategy to an overlay. */\n  attach() {}\n  /** Blocks page-level scroll while the attached overlay is open. */\n  enable() {\n    if (this._canBeEnabled()) {\n      const root = this._document.documentElement;\n      this._previousScrollPosition = this._viewportRuler.getViewportScrollPosition();\n      // Cache the previous inline styles in case the user had set them.\n      this._previousHTMLStyles.left = root.style.left || '';\n      this._previousHTMLStyles.top = root.style.top || '';\n      // Note: we're using the `html` node, instead of the `body`, because the `body` may\n      // have the user agent margin, whereas the `html` is guaranteed not to have one.\n      root.style.left = coerceCssPixelValue(-this._previousScrollPosition.left);\n      root.style.top = coerceCssPixelValue(-this._previousScrollPosition.top);\n      root.classList.add('cdk-global-scrollblock');\n      this._isEnabled = true;\n    }\n  }\n  /** Unblocks page-level scroll while the attached overlay is open. */\n  disable() {\n    if (this._isEnabled) {\n      const html = this._document.documentElement;\n      const body = this._document.body;\n      const htmlStyle = html.style;\n      const bodyStyle = body.style;\n      const previousHtmlScrollBehavior = htmlStyle.scrollBehavior || '';\n      const previousBodyScrollBehavior = bodyStyle.scrollBehavior || '';\n      this._isEnabled = false;\n      htmlStyle.left = this._previousHTMLStyles.left;\n      htmlStyle.top = this._previousHTMLStyles.top;\n      html.classList.remove('cdk-global-scrollblock');\n      // Disable user-defined smooth scrolling temporarily while we restore the scroll position.\n      // See https://developer.mozilla.org/en-US/docs/Web/CSS/scroll-behavior\n      // Note that we don't mutate the property if the browser doesn't support `scroll-behavior`,\n      // because it can throw off feature detections in `supportsScrollBehavior` which\n      // checks for `'scrollBehavior' in documentElement.style`.\n      if (scrollBehaviorSupported) {\n        htmlStyle.scrollBehavior = bodyStyle.scrollBehavior = 'auto';\n      }\n      window.scroll(this._previousScrollPosition.left, this._previousScrollPosition.top);\n      if (scrollBehaviorSupported) {\n        htmlStyle.scrollBehavior = previousHtmlScrollBehavior;\n        bodyStyle.scrollBehavior = previousBodyScrollBehavior;\n      }\n    }\n  }\n  _canBeEnabled() {\n    // Since the scroll strategies can't be singletons, we have to use a global CSS class\n    // (`cdk-global-scrollblock`) to make sure that we don't try to disable global\n    // scrolling multiple times.\n    const html = this._document.documentElement;\n    if (html.classList.contains('cdk-global-scrollblock') || this._isEnabled) {\n      return false;\n    }\n    const body = this._document.body;\n    const viewport = this._viewportRuler.getViewportSize();\n    return body.scrollHeight > viewport.height || body.scrollWidth > viewport.width;\n  }\n}\n\n/**\n * Returns an error to be thrown when attempting to attach an already-attached scroll strategy.\n */\nfunction getMatScrollStrategyAlreadyAttachedError() {\n  return Error(`Scroll strategy has already been attached.`);\n}\n\n/**\n * Strategy that will close the overlay as soon as the user starts scrolling.\n */\nclass CloseScrollStrategy {\n  constructor(_scrollDispatcher, _ngZone, _viewportRuler, _config) {\n    this._scrollDispatcher = _scrollDispatcher;\n    this._ngZone = _ngZone;\n    this._viewportRuler = _viewportRuler;\n    this._config = _config;\n    this._scrollSubscription = null;\n    /** Detaches the overlay ref and disables the scroll strategy. */\n    this._detach = () => {\n      this.disable();\n      if (this._overlayRef.hasAttached()) {\n        this._ngZone.run(() => this._overlayRef.detach());\n      }\n    };\n  }\n  /** Attaches this scroll strategy to an overlay. */\n  attach(overlayRef) {\n    if (this._overlayRef && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw getMatScrollStrategyAlreadyAttachedError();\n    }\n    this._overlayRef = overlayRef;\n  }\n  /** Enables the closing of the attached overlay on scroll. */\n  enable() {\n    if (this._scrollSubscription) {\n      return;\n    }\n    const stream = this._scrollDispatcher.scrolled(0).pipe(filter(scrollable => {\n      return !scrollable || !this._overlayRef.overlayElement.contains(scrollable.getElementRef().nativeElement);\n    }));\n    if (this._config && this._config.threshold && this._config.threshold > 1) {\n      this._initialScrollPosition = this._viewportRuler.getViewportScrollPosition().top;\n      this._scrollSubscription = stream.subscribe(() => {\n        const scrollPosition = this._viewportRuler.getViewportScrollPosition().top;\n        if (Math.abs(scrollPosition - this._initialScrollPosition) > this._config.threshold) {\n          this._detach();\n        } else {\n          this._overlayRef.updatePosition();\n        }\n      });\n    } else {\n      this._scrollSubscription = stream.subscribe(this._detach);\n    }\n  }\n  /** Disables the closing the attached overlay on scroll. */\n  disable() {\n    if (this._scrollSubscription) {\n      this._scrollSubscription.unsubscribe();\n      this._scrollSubscription = null;\n    }\n  }\n  detach() {\n    this.disable();\n    this._overlayRef = null;\n  }\n}\n\n/** Scroll strategy that doesn't do anything. */\nclass NoopScrollStrategy {\n  /** Does nothing, as this scroll strategy is a no-op. */\n  enable() {}\n  /** Does nothing, as this scroll strategy is a no-op. */\n  disable() {}\n  /** Does nothing, as this scroll strategy is a no-op. */\n  attach() {}\n}\n\n/**\n * Gets whether an element is scrolled outside of view by any of its parent scrolling containers.\n * @param element Dimensions of the element (from getBoundingClientRect)\n * @param scrollContainers Dimensions of element's scrolling containers (from getBoundingClientRect)\n * @returns Whether the element is scrolled out of view\n * @docs-private\n */\nfunction isElementScrolledOutsideView(element, scrollContainers) {\n  return scrollContainers.some(containerBounds => {\n    const outsideAbove = element.bottom < containerBounds.top;\n    const outsideBelow = element.top > containerBounds.bottom;\n    const outsideLeft = element.right < containerBounds.left;\n    const outsideRight = element.left > containerBounds.right;\n    return outsideAbove || outsideBelow || outsideLeft || outsideRight;\n  });\n}\n/**\n * Gets whether an element is clipped by any of its scrolling containers.\n * @param element Dimensions of the element (from getBoundingClientRect)\n * @param scrollContainers Dimensions of element's scrolling containers (from getBoundingClientRect)\n * @returns Whether the element is clipped\n * @docs-private\n */\nfunction isElementClippedByScrolling(element, scrollContainers) {\n  return scrollContainers.some(scrollContainerRect => {\n    const clippedAbove = element.top < scrollContainerRect.top;\n    const clippedBelow = element.bottom > scrollContainerRect.bottom;\n    const clippedLeft = element.left < scrollContainerRect.left;\n    const clippedRight = element.right > scrollContainerRect.right;\n    return clippedAbove || clippedBelow || clippedLeft || clippedRight;\n  });\n}\n\n/**\n * Strategy that will update the element position as the user is scrolling.\n */\nclass RepositionScrollStrategy {\n  constructor(_scrollDispatcher, _viewportRuler, _ngZone, _config) {\n    this._scrollDispatcher = _scrollDispatcher;\n    this._viewportRuler = _viewportRuler;\n    this._ngZone = _ngZone;\n    this._config = _config;\n    this._scrollSubscription = null;\n  }\n  /** Attaches this scroll strategy to an overlay. */\n  attach(overlayRef) {\n    if (this._overlayRef && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw getMatScrollStrategyAlreadyAttachedError();\n    }\n    this._overlayRef = overlayRef;\n  }\n  /** Enables repositioning of the attached overlay on scroll. */\n  enable() {\n    if (!this._scrollSubscription) {\n      const throttle = this._config ? this._config.scrollThrottle : 0;\n      this._scrollSubscription = this._scrollDispatcher.scrolled(throttle).subscribe(() => {\n        this._overlayRef.updatePosition();\n        // TODO(crisbeto): make `close` on by default once all components can handle it.\n        if (this._config && this._config.autoClose) {\n          const overlayRect = this._overlayRef.overlayElement.getBoundingClientRect();\n          const {\n            width,\n            height\n          } = this._viewportRuler.getViewportSize();\n          // TODO(crisbeto): include all ancestor scroll containers here once\n          // we have a way of exposing the trigger element to the scroll strategy.\n          const parentRects = [{\n            width,\n            height,\n            bottom: height,\n            right: width,\n            top: 0,\n            left: 0\n          }];\n          if (isElementScrolledOutsideView(overlayRect, parentRects)) {\n            this.disable();\n            this._ngZone.run(() => this._overlayRef.detach());\n          }\n        }\n      });\n    }\n  }\n  /** Disables repositioning of the attached overlay on scroll. */\n  disable() {\n    if (this._scrollSubscription) {\n      this._scrollSubscription.unsubscribe();\n      this._scrollSubscription = null;\n    }\n  }\n  detach() {\n    this.disable();\n    this._overlayRef = null;\n  }\n}\n\n/**\n * Options for how an overlay will handle scrolling.\n *\n * Users can provide a custom value for `ScrollStrategyOptions` to replace the default\n * behaviors. This class primarily acts as a factory for ScrollStrategy instances.\n */\nclass ScrollStrategyOptions {\n  constructor(_scrollDispatcher, _viewportRuler, _ngZone, document) {\n    this._scrollDispatcher = _scrollDispatcher;\n    this._viewportRuler = _viewportRuler;\n    this._ngZone = _ngZone;\n    /** Do nothing on scroll. */\n    this.noop = () => new NoopScrollStrategy();\n    /**\n     * Close the overlay as soon as the user scrolls.\n     * @param config Configuration to be used inside the scroll strategy.\n     */\n    this.close = config => new CloseScrollStrategy(this._scrollDispatcher, this._ngZone, this._viewportRuler, config);\n    /** Block scrolling. */\n    this.block = () => new BlockScrollStrategy(this._viewportRuler, this._document);\n    /**\n     * Update the overlay's position on scroll.\n     * @param config Configuration to be used inside the scroll strategy.\n     * Allows debouncing the reposition calls.\n     */\n    this.reposition = config => new RepositionScrollStrategy(this._scrollDispatcher, this._viewportRuler, this._ngZone, config);\n    this._document = document;\n  }\n  static {\n    this.ɵfac = function ScrollStrategyOptions_Factory(t) {\n      return new (t || ScrollStrategyOptions)(i0.ɵɵinject(i1.ScrollDispatcher), i0.ɵɵinject(i1.ViewportRuler), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(DOCUMENT));\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: ScrollStrategyOptions,\n      factory: ScrollStrategyOptions.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(ScrollStrategyOptions, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], () => [{\n    type: i1.ScrollDispatcher\n  }, {\n    type: i1.ViewportRuler\n  }, {\n    type: i0.NgZone\n  }, {\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }], null);\n})();\n\n/** Initial configuration used when creating an overlay. */\nclass OverlayConfig {\n  constructor(config) {\n    /** Strategy to be used when handling scroll events while the overlay is open. */\n    this.scrollStrategy = new NoopScrollStrategy();\n    /** Custom class to add to the overlay pane. */\n    this.panelClass = '';\n    /** Whether the overlay has a backdrop. */\n    this.hasBackdrop = false;\n    /** Custom class to add to the backdrop */\n    this.backdropClass = 'cdk-overlay-dark-backdrop';\n    /**\n     * Whether the overlay should be disposed of when the user goes backwards/forwards in history.\n     * Note that this usually doesn't include clicking on links (unless the user is using\n     * the `HashLocationStrategy`).\n     */\n    this.disposeOnNavigation = false;\n    if (config) {\n      // Use `Iterable` instead of `Array` because TypeScript, as of 3.6.3,\n      // loses the array generic type in the `for of`. But we *also* have to use `Array` because\n      // typescript won't iterate over an `Iterable` unless you compile with `--downlevelIteration`\n      const configKeys = Object.keys(config);\n      for (const key of configKeys) {\n        if (config[key] !== undefined) {\n          // TypeScript, as of version 3.5, sees the left-hand-side of this expression\n          // as \"I don't know *which* key this is, so the only valid value is the intersection\n          // of all the possible values.\" In this case, that happens to be `undefined`. TypeScript\n          // is not smart enough to see that the right-hand-side is actually an access of the same\n          // exact type with the same exact key, meaning that the value type must be identical.\n          // So we use `any` to work around this.\n          this[key] = config[key];\n        }\n      }\n    }\n  }\n}\n\n/** The points of the origin element and the overlay element to connect. */\nclass ConnectionPositionPair {\n  constructor(origin, overlay, /** Offset along the X axis. */\n  offsetX, /** Offset along the Y axis. */\n  offsetY, /** Class(es) to be applied to the panel while this position is active. */\n  panelClass) {\n    this.offsetX = offsetX;\n    this.offsetY = offsetY;\n    this.panelClass = panelClass;\n    this.originX = origin.originX;\n    this.originY = origin.originY;\n    this.overlayX = overlay.overlayX;\n    this.overlayY = overlay.overlayY;\n  }\n}\n/**\n * Set of properties regarding the position of the origin and overlay relative to the viewport\n * with respect to the containing Scrollable elements.\n *\n * The overlay and origin are clipped if any part of their bounding client rectangle exceeds the\n * bounds of any one of the strategy's Scrollable's bounding client rectangle.\n *\n * The overlay and origin are outside view if there is no overlap between their bounding client\n * rectangle and any one of the strategy's Scrollable's bounding client rectangle.\n *\n *       -----------                    -----------\n *       | outside |                    | clipped |\n *       |  view   |              --------------------------\n *       |         |              |     |         |        |\n *       ----------               |     -----------        |\n *  --------------------------    |                        |\n *  |                        |    |      Scrollable        |\n *  |                        |    |                        |\n *  |                        |     --------------------------\n *  |      Scrollable        |\n *  |                        |\n *  --------------------------\n *\n *  @docs-private\n */\nclass ScrollingVisibility {}\n/** The change event emitted by the strategy when a fallback position is used. */\nclass ConnectedOverlayPositionChange {\n  constructor( /** The position used as a result of this change. */\n  connectionPair, /** @docs-private */\n  scrollableViewProperties) {\n    this.connectionPair = connectionPair;\n    this.scrollableViewProperties = scrollableViewProperties;\n  }\n}\n/**\n * Validates whether a vertical position property matches the expected values.\n * @param property Name of the property being validated.\n * @param value Value of the property being validated.\n * @docs-private\n */\nfunction validateVerticalPosition(property, value) {\n  if (value !== 'top' && value !== 'bottom' && value !== 'center') {\n    throw Error(`ConnectedPosition: Invalid ${property} \"${value}\". ` + `Expected \"top\", \"bottom\" or \"center\".`);\n  }\n}\n/**\n * Validates whether a horizontal position property matches the expected values.\n * @param property Name of the property being validated.\n * @param value Value of the property being validated.\n * @docs-private\n */\nfunction validateHorizontalPosition(property, value) {\n  if (value !== 'start' && value !== 'end' && value !== 'center') {\n    throw Error(`ConnectedPosition: Invalid ${property} \"${value}\". ` + `Expected \"start\", \"end\" or \"center\".`);\n  }\n}\n\n/**\n * Service for dispatching events that land on the body to appropriate overlay ref,\n * if any. It maintains a list of attached overlays to determine best suited overlay based\n * on event target and order of overlay opens.\n */\nclass BaseOverlayDispatcher {\n  constructor(document) {\n    /** Currently attached overlays in the order they were attached. */\n    this._attachedOverlays = [];\n    this._document = document;\n  }\n  ngOnDestroy() {\n    this.detach();\n  }\n  /** Add a new overlay to the list of attached overlay refs. */\n  add(overlayRef) {\n    // Ensure that we don't get the same overlay multiple times.\n    this.remove(overlayRef);\n    this._attachedOverlays.push(overlayRef);\n  }\n  /** Remove an overlay from the list of attached overlay refs. */\n  remove(overlayRef) {\n    const index = this._attachedOverlays.indexOf(overlayRef);\n    if (index > -1) {\n      this._attachedOverlays.splice(index, 1);\n    }\n    // Remove the global listener once there are no more overlays.\n    if (this._attachedOverlays.length === 0) {\n      this.detach();\n    }\n  }\n  static {\n    this.ɵfac = function BaseOverlayDispatcher_Factory(t) {\n      return new (t || BaseOverlayDispatcher)(i0.ɵɵinject(DOCUMENT));\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: BaseOverlayDispatcher,\n      factory: BaseOverlayDispatcher.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(BaseOverlayDispatcher, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], () => [{\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }], null);\n})();\n\n/**\n * Service for dispatching keyboard events that land on the body to appropriate overlay ref,\n * if any. It maintains a list of attached overlays to determine best suited overlay based\n * on event target and order of overlay opens.\n */\nclass OverlayKeyboardDispatcher extends BaseOverlayDispatcher {\n  constructor(document, /** @breaking-change 14.0.0 _ngZone will be required. */\n  _ngZone) {\n    super(document);\n    this._ngZone = _ngZone;\n    /** Keyboard event listener that will be attached to the body. */\n    this._keydownListener = event => {\n      const overlays = this._attachedOverlays;\n      for (let i = overlays.length - 1; i > -1; i--) {\n        // Dispatch the keydown event to the top overlay which has subscribers to its keydown events.\n        // We want to target the most recent overlay, rather than trying to match where the event came\n        // from, because some components might open an overlay, but keep focus on a trigger element\n        // (e.g. for select and autocomplete). We skip overlays without keydown event subscriptions,\n        // because we don't want overlays that don't handle keyboard events to block the ones below\n        // them that do.\n        if (overlays[i]._keydownEvents.observers.length > 0) {\n          const keydownEvents = overlays[i]._keydownEvents;\n          /** @breaking-change 14.0.0 _ngZone will be required. */\n          if (this._ngZone) {\n            this._ngZone.run(() => keydownEvents.next(event));\n          } else {\n            keydownEvents.next(event);\n          }\n          break;\n        }\n      }\n    };\n  }\n  /** Add a new overlay to the list of attached overlay refs. */\n  add(overlayRef) {\n    super.add(overlayRef);\n    // Lazily start dispatcher once first overlay is added\n    if (!this._isAttached) {\n      /** @breaking-change 14.0.0 _ngZone will be required. */\n      if (this._ngZone) {\n        this._ngZone.runOutsideAngular(() => this._document.body.addEventListener('keydown', this._keydownListener));\n      } else {\n        this._document.body.addEventListener('keydown', this._keydownListener);\n      }\n      this._isAttached = true;\n    }\n  }\n  /** Detaches the global keyboard event listener. */\n  detach() {\n    if (this._isAttached) {\n      this._document.body.removeEventListener('keydown', this._keydownListener);\n      this._isAttached = false;\n    }\n  }\n  static {\n    this.ɵfac = function OverlayKeyboardDispatcher_Factory(t) {\n      return new (t || OverlayKeyboardDispatcher)(i0.ɵɵinject(DOCUMENT), i0.ɵɵinject(i0.NgZone, 8));\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: OverlayKeyboardDispatcher,\n      factory: OverlayKeyboardDispatcher.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(OverlayKeyboardDispatcher, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], () => [{\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }, {\n    type: i0.NgZone,\n    decorators: [{\n      type: Optional\n    }]\n  }], null);\n})();\n\n/**\n * Service for dispatching mouse click events that land on the body to appropriate overlay ref,\n * if any. It maintains a list of attached overlays to determine best suited overlay based\n * on event target and order of overlay opens.\n */\nclass OverlayOutsideClickDispatcher extends BaseOverlayDispatcher {\n  constructor(document, _platform, /** @breaking-change 14.0.0 _ngZone will be required. */\n  _ngZone) {\n    super(document);\n    this._platform = _platform;\n    this._ngZone = _ngZone;\n    this._cursorStyleIsSet = false;\n    /** Store pointerdown event target to track origin of click. */\n    this._pointerDownListener = event => {\n      this._pointerDownEventTarget = _getEventTarget(event);\n    };\n    /** Click event listener that will be attached to the body propagate phase. */\n    this._clickListener = event => {\n      const target = _getEventTarget(event);\n      // In case of a click event, we want to check the origin of the click\n      // (e.g. in case where a user starts a click inside the overlay and\n      // releases the click outside of it).\n      // This is done by using the event target of the preceding pointerdown event.\n      // Every click event caused by a pointer device has a preceding pointerdown\n      // event, unless the click was programmatically triggered (e.g. in a unit test).\n      const origin = event.type === 'click' && this._pointerDownEventTarget ? this._pointerDownEventTarget : target;\n      // Reset the stored pointerdown event target, to avoid having it interfere\n      // in subsequent events.\n      this._pointerDownEventTarget = null;\n      // We copy the array because the original may be modified asynchronously if the\n      // outsidePointerEvents listener decides to detach overlays resulting in index errors inside\n      // the for loop.\n      const overlays = this._attachedOverlays.slice();\n      // Dispatch the mouse event to the top overlay which has subscribers to its mouse events.\n      // We want to target all overlays for which the click could be considered as outside click.\n      // As soon as we reach an overlay for which the click is not outside click we break off\n      // the loop.\n      for (let i = overlays.length - 1; i > -1; i--) {\n        const overlayRef = overlays[i];\n        if (overlayRef._outsidePointerEvents.observers.length < 1 || !overlayRef.hasAttached()) {\n          continue;\n        }\n        // If it's a click inside the overlay, just break - we should do nothing\n        // If it's an outside click (both origin and target of the click) dispatch the mouse event,\n        // and proceed with the next overlay\n        if (overlayRef.overlayElement.contains(target) || overlayRef.overlayElement.contains(origin)) {\n          break;\n        }\n        const outsidePointerEvents = overlayRef._outsidePointerEvents;\n        /** @breaking-change 14.0.0 _ngZone will be required. */\n        if (this._ngZone) {\n          this._ngZone.run(() => outsidePointerEvents.next(event));\n        } else {\n          outsidePointerEvents.next(event);\n        }\n      }\n    };\n  }\n  /** Add a new overlay to the list of attached overlay refs. */\n  add(overlayRef) {\n    super.add(overlayRef);\n    // Safari on iOS does not generate click events for non-interactive\n    // elements. However, we want to receive a click for any element outside\n    // the overlay. We can force a \"clickable\" state by setting\n    // `cursor: pointer` on the document body. See:\n    // https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event#Safari_Mobile\n    // https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html\n    if (!this._isAttached) {\n      const body = this._document.body;\n      /** @breaking-change 14.0.0 _ngZone will be required. */\n      if (this._ngZone) {\n        this._ngZone.runOutsideAngular(() => this._addEventListeners(body));\n      } else {\n        this._addEventListeners(body);\n      }\n      // click event is not fired on iOS. To make element \"clickable\" we are\n      // setting the cursor to pointer\n      if (this._platform.IOS && !this._cursorStyleIsSet) {\n        this._cursorOriginalValue = body.style.cursor;\n        body.style.cursor = 'pointer';\n        this._cursorStyleIsSet = true;\n      }\n      this._isAttached = true;\n    }\n  }\n  /** Detaches the global keyboard event listener. */\n  detach() {\n    if (this._isAttached) {\n      const body = this._document.body;\n      body.removeEventListener('pointerdown', this._pointerDownListener, true);\n      body.removeEventListener('click', this._clickListener, true);\n      body.removeEventListener('auxclick', this._clickListener, true);\n      body.removeEventListener('contextmenu', this._clickListener, true);\n      if (this._platform.IOS && this._cursorStyleIsSet) {\n        body.style.cursor = this._cursorOriginalValue;\n        this._cursorStyleIsSet = false;\n      }\n      this._isAttached = false;\n    }\n  }\n  _addEventListeners(body) {\n    body.addEventListener('pointerdown', this._pointerDownListener, true);\n    body.addEventListener('click', this._clickListener, true);\n    body.addEventListener('auxclick', this._clickListener, true);\n    body.addEventListener('contextmenu', this._clickListener, true);\n  }\n  static {\n    this.ɵfac = function OverlayOutsideClickDispatcher_Factory(t) {\n      return new (t || OverlayOutsideClickDispatcher)(i0.ɵɵinject(DOCUMENT), i0.ɵɵinject(i1$1.Platform), i0.ɵɵinject(i0.NgZone, 8));\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: OverlayOutsideClickDispatcher,\n      factory: OverlayOutsideClickDispatcher.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(OverlayOutsideClickDispatcher, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], () => [{\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }, {\n    type: i1$1.Platform\n  }, {\n    type: i0.NgZone,\n    decorators: [{\n      type: Optional\n    }]\n  }], null);\n})();\n\n/** Container inside which all overlays will render. */\nclass OverlayContainer {\n  constructor(document, _platform) {\n    this._platform = _platform;\n    this._document = document;\n  }\n  ngOnDestroy() {\n    this._containerElement?.remove();\n  }\n  /**\n   * This method returns the overlay container element. It will lazily\n   * create the element the first time it is called to facilitate using\n   * the container in non-browser environments.\n   * @returns the container element\n   */\n  getContainerElement() {\n    if (!this._containerElement) {\n      this._createContainer();\n    }\n    return this._containerElement;\n  }\n  /**\n   * Create the overlay container element, which is simply a div\n   * with the 'cdk-overlay-container' class on the document body.\n   */\n  _createContainer() {\n    const containerClass = 'cdk-overlay-container';\n    // TODO(crisbeto): remove the testing check once we have an overlay testing\n    // module or Angular starts tearing down the testing `NgModule`. See:\n    // https://github.com/angular/angular/issues/18831\n    if (this._platform.isBrowser || _isTestEnvironment()) {\n      const oppositePlatformContainers = this._document.querySelectorAll(`.${containerClass}[platform=\"server\"], ` + `.${containerClass}[platform=\"test\"]`);\n      // Remove any old containers from the opposite platform.\n      // This can happen when transitioning from the server to the client.\n      for (let i = 0; i < oppositePlatformContainers.length; i++) {\n        oppositePlatformContainers[i].remove();\n      }\n    }\n    const container = this._document.createElement('div');\n    container.classList.add(containerClass);\n    // A long time ago we kept adding new overlay containers whenever a new app was instantiated,\n    // but at some point we added logic which clears the duplicate ones in order to avoid leaks.\n    // The new logic was a little too aggressive since it was breaking some legitimate use cases.\n    // To mitigate the problem we made it so that only containers from a different platform are\n    // cleared, but the side-effect was that people started depending on the overly-aggressive\n    // logic to clean up their tests for them. Until we can introduce an overlay-specific testing\n    // module which does the cleanup, we try to detect that we're in a test environment and we\n    // always clear the container. See #17006.\n    // TODO(crisbeto): remove the test environment check once we have an overlay testing module.\n    if (_isTestEnvironment()) {\n      container.setAttribute('platform', 'test');\n    } else if (!this._platform.isBrowser) {\n      container.setAttribute('platform', 'server');\n    }\n    this._document.body.appendChild(container);\n    this._containerElement = container;\n  }\n  static {\n    this.ɵfac = function OverlayContainer_Factory(t) {\n      return new (t || OverlayContainer)(i0.ɵɵinject(DOCUMENT), i0.ɵɵinject(i1$1.Platform));\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: OverlayContainer,\n      factory: OverlayContainer.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(OverlayContainer, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], () => [{\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }, {\n    type: i1$1.Platform\n  }], null);\n})();\n\n/**\n * Reference to an overlay that has been created with the Overlay service.\n * Used to manipulate or dispose of said overlay.\n */\nclass OverlayRef {\n  constructor(_portalOutlet, _host, _pane, _config, _ngZone, _keyboardDispatcher, _document, _location, _outsideClickDispatcher, _animationsDisabled = false) {\n    this._portalOutlet = _portalOutlet;\n    this._host = _host;\n    this._pane = _pane;\n    this._config = _config;\n    this._ngZone = _ngZone;\n    this._keyboardDispatcher = _keyboardDispatcher;\n    this._document = _document;\n    this._location = _location;\n    this._outsideClickDispatcher = _outsideClickDispatcher;\n    this._animationsDisabled = _animationsDisabled;\n    this._backdropElement = null;\n    this._backdropClick = new Subject();\n    this._attachments = new Subject();\n    this._detachments = new Subject();\n    this._locationChanges = Subscription.EMPTY;\n    this._backdropClickHandler = event => this._backdropClick.next(event);\n    this._backdropTransitionendHandler = event => {\n      this._disposeBackdrop(event.target);\n    };\n    /** Stream of keydown events dispatched to this overlay. */\n    this._keydownEvents = new Subject();\n    /** Stream of mouse outside events dispatched to this overlay. */\n    this._outsidePointerEvents = new Subject();\n    if (_config.scrollStrategy) {\n      this._scrollStrategy = _config.scrollStrategy;\n      this._scrollStrategy.attach(this);\n    }\n    this._positionStrategy = _config.positionStrategy;\n  }\n  /** The overlay's HTML element */\n  get overlayElement() {\n    return this._pane;\n  }\n  /** The overlay's backdrop HTML element. */\n  get backdropElement() {\n    return this._backdropElement;\n  }\n  /**\n   * Wrapper around the panel element. Can be used for advanced\n   * positioning where a wrapper with specific styling is\n   * required around the overlay pane.\n   */\n  get hostElement() {\n    return this._host;\n  }\n  /**\n   * Attaches content, given via a Portal, to the overlay.\n   * If the overlay is configured to have a backdrop, it will be created.\n   *\n   * @param portal Portal instance to which to attach the overlay.\n   * @returns The portal attachment result.\n   */\n  attach(portal) {\n    // Insert the host into the DOM before attaching the portal, otherwise\n    // the animations module will skip animations on repeat attachments.\n    if (!this._host.parentElement && this._previousHostParent) {\n      this._previousHostParent.appendChild(this._host);\n    }\n    const attachResult = this._portalOutlet.attach(portal);\n    if (this._positionStrategy) {\n      this._positionStrategy.attach(this);\n    }\n    this._updateStackingOrder();\n    this._updateElementSize();\n    this._updateElementDirection();\n    if (this._scrollStrategy) {\n      this._scrollStrategy.enable();\n    }\n    // Update the position once the zone is stable so that the overlay will be fully rendered\n    // before attempting to position it, as the position may depend on the size of the rendered\n    // content.\n    this._ngZone.onStable.pipe(take(1)).subscribe(() => {\n      // The overlay could've been detached before the zone has stabilized.\n      if (this.hasAttached()) {\n        this.updatePosition();\n      }\n    });\n    // Enable pointer events for the overlay pane element.\n    this._togglePointerEvents(true);\n    if (this._config.hasBackdrop) {\n      this._attachBackdrop();\n    }\n    if (this._config.panelClass) {\n      this._toggleClasses(this._pane, this._config.panelClass, true);\n    }\n    // Only emit the `attachments` event once all other setup is done.\n    this._attachments.next();\n    // Track this overlay by the keyboard dispatcher\n    this._keyboardDispatcher.add(this);\n    if (this._config.disposeOnNavigation) {\n      this._locationChanges = this._location.subscribe(() => this.dispose());\n    }\n    this._outsideClickDispatcher.add(this);\n    // TODO(crisbeto): the null check is here, because the portal outlet returns `any`.\n    // We should be guaranteed for the result to be `ComponentRef | EmbeddedViewRef`, but\n    // `instanceof EmbeddedViewRef` doesn't appear to work at the moment.\n    if (typeof attachResult?.onDestroy === 'function') {\n      // In most cases we control the portal and we know when it is being detached so that\n      // we can finish the disposal process. The exception is if the user passes in a custom\n      // `ViewContainerRef` that isn't destroyed through the overlay API. Note that we use\n      // `detach` here instead of `dispose`, because we don't know if the user intends to\n      // reattach the overlay at a later point. It also has the advantage of waiting for animations.\n      attachResult.onDestroy(() => {\n        if (this.hasAttached()) {\n          // We have to delay the `detach` call, because detaching immediately prevents\n          // other destroy hooks from running. This is likely a framework bug similar to\n          // https://github.com/angular/angular/issues/46119\n          this._ngZone.runOutsideAngular(() => Promise.resolve().then(() => this.detach()));\n        }\n      });\n    }\n    return attachResult;\n  }\n  /**\n   * Detaches an overlay from a portal.\n   * @returns The portal detachment result.\n   */\n  detach() {\n    if (!this.hasAttached()) {\n      return;\n    }\n    this.detachBackdrop();\n    // When the overlay is detached, the pane element should disable pointer events.\n    // This is necessary because otherwise the pane element will cover the page and disable\n    // pointer events therefore. Depends on the position strategy and the applied pane boundaries.\n    this._togglePointerEvents(false);\n    if (this._positionStrategy && this._positionStrategy.detach) {\n      this._positionStrategy.detach();\n    }\n    if (this._scrollStrategy) {\n      this._scrollStrategy.disable();\n    }\n    const detachmentResult = this._portalOutlet.detach();\n    // Only emit after everything is detached.\n    this._detachments.next();\n    // Remove this overlay from keyboard dispatcher tracking.\n    this._keyboardDispatcher.remove(this);\n    // Keeping the host element in the DOM can cause scroll jank, because it still gets\n    // rendered, even though it's transparent and unclickable which is why we remove it.\n    this._detachContentWhenStable();\n    this._locationChanges.unsubscribe();\n    this._outsideClickDispatcher.remove(this);\n    return detachmentResult;\n  }\n  /** Cleans up the overlay from the DOM. */\n  dispose() {\n    const isAttached = this.hasAttached();\n    if (this._positionStrategy) {\n      this._positionStrategy.dispose();\n    }\n    this._disposeScrollStrategy();\n    this._disposeBackdrop(this._backdropElement);\n    this._locationChanges.unsubscribe();\n    this._keyboardDispatcher.remove(this);\n    this._portalOutlet.dispose();\n    this._attachments.complete();\n    this._backdropClick.complete();\n    this._keydownEvents.complete();\n    this._outsidePointerEvents.complete();\n    this._outsideClickDispatcher.remove(this);\n    this._host?.remove();\n    this._previousHostParent = this._pane = this._host = null;\n    if (isAttached) {\n      this._detachments.next();\n    }\n    this._detachments.complete();\n  }\n  /** Whether the overlay has attached content. */\n  hasAttached() {\n    return this._portalOutlet.hasAttached();\n  }\n  /** Gets an observable that emits when the backdrop has been clicked. */\n  backdropClick() {\n    return this._backdropClick;\n  }\n  /** Gets an observable that emits when the overlay has been attached. */\n  attachments() {\n    return this._attachments;\n  }\n  /** Gets an observable that emits when the overlay has been detached. */\n  detachments() {\n    return this._detachments;\n  }\n  /** Gets an observable of keydown events targeted to this overlay. */\n  keydownEvents() {\n    return this._keydownEvents;\n  }\n  /** Gets an observable of pointer events targeted outside this overlay. */\n  outsidePointerEvents() {\n    return this._outsidePointerEvents;\n  }\n  /** Gets the current overlay configuration, which is immutable. */\n  getConfig() {\n    return this._config;\n  }\n  /** Updates the position of the overlay based on the position strategy. */\n  updatePosition() {\n    if (this._positionStrategy) {\n      this._positionStrategy.apply();\n    }\n  }\n  /** Switches to a new position strategy and updates the overlay position. */\n  updatePositionStrategy(strategy) {\n    if (strategy === this._positionStrategy) {\n      return;\n    }\n    if (this._positionStrategy) {\n      this._positionStrategy.dispose();\n    }\n    this._positionStrategy = strategy;\n    if (this.hasAttached()) {\n      strategy.attach(this);\n      this.updatePosition();\n    }\n  }\n  /** Update the size properties of the overlay. */\n  updateSize(sizeConfig) {\n    this._config = {\n      ...this._config,\n      ...sizeConfig\n    };\n    this._updateElementSize();\n  }\n  /** Sets the LTR/RTL direction for the overlay. */\n  setDirection(dir) {\n    this._config = {\n      ...this._config,\n      direction: dir\n    };\n    this._updateElementDirection();\n  }\n  /** Add a CSS class or an array of classes to the overlay pane. */\n  addPanelClass(classes) {\n    if (this._pane) {\n      this._toggleClasses(this._pane, classes, true);\n    }\n  }\n  /** Remove a CSS class or an array of classes from the overlay pane. */\n  removePanelClass(classes) {\n    if (this._pane) {\n      this._toggleClasses(this._pane, classes, false);\n    }\n  }\n  /**\n   * Returns the layout direction of the overlay panel.\n   */\n  getDirection() {\n    const direction = this._config.direction;\n    if (!direction) {\n      return 'ltr';\n    }\n    return typeof direction === 'string' ? direction : direction.value;\n  }\n  /** Switches to a new scroll strategy. */\n  updateScrollStrategy(strategy) {\n    if (strategy === this._scrollStrategy) {\n      return;\n    }\n    this._disposeScrollStrategy();\n    this._scrollStrategy = strategy;\n    if (this.hasAttached()) {\n      strategy.attach(this);\n      strategy.enable();\n    }\n  }\n  /** Updates the text direction of the overlay panel. */\n  _updateElementDirection() {\n    this._host.setAttribute('dir', this.getDirection());\n  }\n  /** Updates the size of the overlay element based on the overlay config. */\n  _updateElementSize() {\n    if (!this._pane) {\n      return;\n    }\n    const style = this._pane.style;\n    style.width = coerceCssPixelValue(this._config.width);\n    style.height = coerceCssPixelValue(this._config.height);\n    style.minWidth = coerceCssPixelValue(this._config.minWidth);\n    style.minHeight = coerceCssPixelValue(this._config.minHeight);\n    style.maxWidth = coerceCssPixelValue(this._config.maxWidth);\n    style.maxHeight = coerceCssPixelValue(this._config.maxHeight);\n  }\n  /** Toggles the pointer events for the overlay pane element. */\n  _togglePointerEvents(enablePointer) {\n    this._pane.style.pointerEvents = enablePointer ? '' : 'none';\n  }\n  /** Attaches a backdrop for this overlay. */\n  _attachBackdrop() {\n    const showingClass = 'cdk-overlay-backdrop-showing';\n    this._backdropElement = this._document.createElement('div');\n    this._backdropElement.classList.add('cdk-overlay-backdrop');\n    if (this._animationsDisabled) {\n      this._backdropElement.classList.add('cdk-overlay-backdrop-noop-animation');\n    }\n    if (this._config.backdropClass) {\n      this._toggleClasses(this._backdropElement, this._config.backdropClass, true);\n    }\n    // Insert the backdrop before the pane in the DOM order,\n    // in order to handle stacked overlays properly.\n    this._host.parentElement.insertBefore(this._backdropElement, this._host);\n    // Forward backdrop clicks such that the consumer of the overlay can perform whatever\n    // action desired when such a click occurs (usually closing the overlay).\n    this._backdropElement.addEventListener('click', this._backdropClickHandler);\n    // Add class to fade-in the backdrop after one frame.\n    if (!this._animationsDisabled && typeof requestAnimationFrame !== 'undefined') {\n      this._ngZone.runOutsideAngular(() => {\n        requestAnimationFrame(() => {\n          if (this._backdropElement) {\n            this._backdropElement.classList.add(showingClass);\n          }\n        });\n      });\n    } else {\n      this._backdropElement.classList.add(showingClass);\n    }\n  }\n  /**\n   * Updates the stacking order of the element, moving it to the top if necessary.\n   * This is required in cases where one overlay was detached, while another one,\n   * that should be behind it, was destroyed. The next time both of them are opened,\n   * the stacking will be wrong, because the detached element's pane will still be\n   * in its original DOM position.\n   */\n  _updateStackingOrder() {\n    if (this._host.nextSibling) {\n      this._host.parentNode.appendChild(this._host);\n    }\n  }\n  /** Detaches the backdrop (if any) associated with the overlay. */\n  detachBackdrop() {\n    const backdropToDetach = this._backdropElement;\n    if (!backdropToDetach) {\n      return;\n    }\n    if (this._animationsDisabled) {\n      this._disposeBackdrop(backdropToDetach);\n      return;\n    }\n    backdropToDetach.classList.remove('cdk-overlay-backdrop-showing');\n    this._ngZone.runOutsideAngular(() => {\n      backdropToDetach.addEventListener('transitionend', this._backdropTransitionendHandler);\n    });\n    // If the backdrop doesn't have a transition, the `transitionend` event won't fire.\n    // In this case we make it unclickable and we try to remove it after a delay.\n    backdropToDetach.style.pointerEvents = 'none';\n    // Run this outside the Angular zone because there's nothing that Angular cares about.\n    // If it were to run inside the Angular zone, every test that used Overlay would have to be\n    // either async or fakeAsync.\n    this._backdropTimeout = this._ngZone.runOutsideAngular(() => setTimeout(() => {\n      this._disposeBackdrop(backdropToDetach);\n    }, 500));\n  }\n  /** Toggles a single CSS class or an array of classes on an element. */\n  _toggleClasses(element, cssClasses, isAdd) {\n    const classes = coerceArray(cssClasses || []).filter(c => !!c);\n    if (classes.length) {\n      isAdd ? element.classList.add(...classes) : element.classList.remove(...classes);\n    }\n  }\n  /** Detaches the overlay content next time the zone stabilizes. */\n  _detachContentWhenStable() {\n    // Normally we wouldn't have to explicitly run this outside the `NgZone`, however\n    // if the consumer is using `zone-patch-rxjs`, the `Subscription.unsubscribe` call will\n    // be patched to run inside the zone, which will throw us into an infinite loop.\n    this._ngZone.runOutsideAngular(() => {\n      // We can't remove the host here immediately, because the overlay pane's content\n      // might still be animating. This stream helps us avoid interrupting the animation\n      // by waiting for the pane to become empty.\n      const subscription = this._ngZone.onStable.pipe(takeUntil(merge(this._attachments, this._detachments))).subscribe(() => {\n        // Needs a couple of checks for the pane and host, because\n        // they may have been removed by the time the zone stabilizes.\n        if (!this._pane || !this._host || this._pane.children.length === 0) {\n          if (this._pane && this._config.panelClass) {\n            this._toggleClasses(this._pane, this._config.panelClass, false);\n          }\n          if (this._host && this._host.parentElement) {\n            this._previousHostParent = this._host.parentElement;\n            this._host.remove();\n          }\n          subscription.unsubscribe();\n        }\n      });\n    });\n  }\n  /** Disposes of a scroll strategy. */\n  _disposeScrollStrategy() {\n    const scrollStrategy = this._scrollStrategy;\n    if (scrollStrategy) {\n      scrollStrategy.disable();\n      if (scrollStrategy.detach) {\n        scrollStrategy.detach();\n      }\n    }\n  }\n  /** Removes a backdrop element from the DOM. */\n  _disposeBackdrop(backdrop) {\n    if (backdrop) {\n      backdrop.removeEventListener('click', this._backdropClickHandler);\n      backdrop.removeEventListener('transitionend', this._backdropTransitionendHandler);\n      backdrop.remove();\n      // It is possible that a new portal has been attached to this overlay since we started\n      // removing the backdrop. If that is the case, only clear the backdrop reference if it\n      // is still the same instance that we started to remove.\n      if (this._backdropElement === backdrop) {\n        this._backdropElement = null;\n      }\n    }\n    if (this._backdropTimeout) {\n      clearTimeout(this._backdropTimeout);\n      this._backdropTimeout = undefined;\n    }\n  }\n}\n\n// TODO: refactor clipping detection into a separate thing (part of scrolling module)\n// TODO: doesn't handle both flexible width and height when it has to scroll along both axis.\n/** Class to be added to the overlay bounding box. */\nconst boundingBoxClass = 'cdk-overlay-connected-position-bounding-box';\n/** Regex used to split a string on its CSS units. */\nconst cssUnitPattern = /([A-Za-z%]+)$/;\n/**\n * A strategy for positioning overlays. Using this strategy, an overlay is given an\n * implicit position relative some origin element. The relative position is defined in terms of\n * a point on the origin element that is connected to a point on the overlay element. For example,\n * a basic dropdown is connecting the bottom-left corner of the origin to the top-left corner\n * of the overlay.\n */\nclass FlexibleConnectedPositionStrategy {\n  /** Ordered list of preferred positions, from most to least desirable. */\n  get positions() {\n    return this._preferredPositions;\n  }\n  constructor(connectedTo, _viewportRuler, _document, _platform, _overlayContainer) {\n    this._viewportRuler = _viewportRuler;\n    this._document = _document;\n    this._platform = _platform;\n    this._overlayContainer = _overlayContainer;\n    /** Last size used for the bounding box. Used to avoid resizing the overlay after open. */\n    this._lastBoundingBoxSize = {\n      width: 0,\n      height: 0\n    };\n    /** Whether the overlay was pushed in a previous positioning. */\n    this._isPushed = false;\n    /** Whether the overlay can be pushed on-screen on the initial open. */\n    this._canPush = true;\n    /** Whether the overlay can grow via flexible width/height after the initial open. */\n    this._growAfterOpen = false;\n    /** Whether the overlay's width and height can be constrained to fit within the viewport. */\n    this._hasFlexibleDimensions = true;\n    /** Whether the overlay position is locked. */\n    this._positionLocked = false;\n    /** Amount of space that must be maintained between the overlay and the edge of the viewport. */\n    this._viewportMargin = 0;\n    /** The Scrollable containers used to check scrollable view properties on position change. */\n    this._scrollables = [];\n    /** Ordered list of preferred positions, from most to least desirable. */\n    this._preferredPositions = [];\n    /** Subject that emits whenever the position changes. */\n    this._positionChanges = new Subject();\n    /** Subscription to viewport size changes. */\n    this._resizeSubscription = Subscription.EMPTY;\n    /** Default offset for the overlay along the x axis. */\n    this._offsetX = 0;\n    /** Default offset for the overlay along the y axis. */\n    this._offsetY = 0;\n    /** Keeps track of the CSS classes that the position strategy has applied on the overlay panel. */\n    this._appliedPanelClasses = [];\n    /** Observable sequence of position changes. */\n    this.positionChanges = this._positionChanges;\n    this.setOrigin(connectedTo);\n  }\n  /** Attaches this position strategy to an overlay. */\n  attach(overlayRef) {\n    if (this._overlayRef && overlayRef !== this._overlayRef && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('This position strategy is already attached to an overlay');\n    }\n    this._validatePositions();\n    overlayRef.hostElement.classList.add(boundingBoxClass);\n    this._overlayRef = overlayRef;\n    this._boundingBox = overlayRef.hostElement;\n    this._pane = overlayRef.overlayElement;\n    this._isDisposed = false;\n    this._isInitialRender = true;\n    this._lastPosition = null;\n    this._resizeSubscription.unsubscribe();\n    this._resizeSubscription = this._viewportRuler.change().subscribe(() => {\n      // When the window is resized, we want to trigger the next reposition as if it\n      // was an initial render, in order for the strategy to pick a new optimal position,\n      // otherwise position locking will cause it to stay at the old one.\n      this._isInitialRender = true;\n      this.apply();\n    });\n  }\n  /**\n   * Updates the position of the overlay element, using whichever preferred position relative\n   * to the origin best fits on-screen.\n   *\n   * The selection of a position goes as follows:\n   *  - If any positions fit completely within the viewport as-is,\n   *      choose the first position that does so.\n   *  - If flexible dimensions are enabled and at least one satisfies the given minimum width/height,\n   *      choose the position with the greatest available size modified by the positions' weight.\n   *  - If pushing is enabled, take the position that went off-screen the least and push it\n   *      on-screen.\n   *  - If none of the previous criteria were met, use the position that goes off-screen the least.\n   * @docs-private\n   */\n  apply() {\n    // We shouldn't do anything if the strategy was disposed or we're on the server.\n    if (this._isDisposed || !this._platform.isBrowser) {\n      return;\n    }\n    // If the position has been applied already (e.g. when the overlay was opened) and the\n    // consumer opted into locking in the position, re-use the old position, in order to\n    // prevent the overlay from jumping around.\n    if (!this._isInitialRender && this._positionLocked && this._lastPosition) {\n      this.reapplyLastPosition();\n      return;\n    }\n    this._clearPanelClasses();\n    this._resetOverlayElementStyles();\n    this._resetBoundingBoxStyles();\n    // We need the bounding rects for the origin, the overlay and the container to determine how to position\n    // the overlay relative to the origin.\n    // We use the viewport rect to determine whether a position would go off-screen.\n    this._viewportRect = this._getNarrowedViewportRect();\n    this._originRect = this._getOriginRect();\n    this._overlayRect = this._pane.getBoundingClientRect();\n    this._containerRect = this._overlayContainer.getContainerElement().getBoundingClientRect();\n    const originRect = this._originRect;\n    const overlayRect = this._overlayRect;\n    const viewportRect = this._viewportRect;\n    const containerRect = this._containerRect;\n    // Positions where the overlay will fit with flexible dimensions.\n    const flexibleFits = [];\n    // Fallback if none of the preferred positions fit within the viewport.\n    let fallback;\n    // Go through each of the preferred positions looking for a good fit.\n    // If a good fit is found, it will be applied immediately.\n    for (let pos of this._preferredPositions) {\n      // Get the exact (x, y) coordinate for the point-of-origin on the origin element.\n      let originPoint = this._getOriginPoint(originRect, containerRect, pos);\n      // From that point-of-origin, get the exact (x, y) coordinate for the top-left corner of the\n      // overlay in this position. We use the top-left corner for calculations and later translate\n      // this into an appropriate (top, left, bottom, right) style.\n      let overlayPoint = this._getOverlayPoint(originPoint, overlayRect, pos);\n      // Calculate how well the overlay would fit into the viewport with this point.\n      let overlayFit = this._getOverlayFit(overlayPoint, overlayRect, viewportRect, pos);\n      // If the overlay, without any further work, fits into the viewport, use this position.\n      if (overlayFit.isCompletelyWithinViewport) {\n        this._isPushed = false;\n        this._applyPosition(pos, originPoint);\n        return;\n      }\n      // If the overlay has flexible dimensions, we can use this position\n      // so long as there's enough space for the minimum dimensions.\n      if (this._canFitWithFlexibleDimensions(overlayFit, overlayPoint, viewportRect)) {\n        // Save positions where the overlay will fit with flexible dimensions. We will use these\n        // if none of the positions fit *without* flexible dimensions.\n        flexibleFits.push({\n          position: pos,\n          origin: originPoint,\n          overlayRect,\n          boundingBoxRect: this._calculateBoundingBoxRect(originPoint, pos)\n        });\n        continue;\n      }\n      // If the current preferred position does not fit on the screen, remember the position\n      // if it has more visible area on-screen than we've seen and move onto the next preferred\n      // position.\n      if (!fallback || fallback.overlayFit.visibleArea < overlayFit.visibleArea) {\n        fallback = {\n          overlayFit,\n          overlayPoint,\n          originPoint,\n          position: pos,\n          overlayRect\n        };\n      }\n    }\n    // If there are any positions where the overlay would fit with flexible dimensions, choose the\n    // one that has the greatest area available modified by the position's weight\n    if (flexibleFits.length) {\n      let bestFit = null;\n      let bestScore = -1;\n      for (const fit of flexibleFits) {\n        const score = fit.boundingBoxRect.width * fit.boundingBoxRect.height * (fit.position.weight || 1);\n        if (score > bestScore) {\n          bestScore = score;\n          bestFit = fit;\n        }\n      }\n      this._isPushed = false;\n      this._applyPosition(bestFit.position, bestFit.origin);\n      return;\n    }\n    // When none of the preferred positions fit within the viewport, take the position\n    // that went off-screen the least and attempt to push it on-screen.\n    if (this._canPush) {\n      // TODO(jelbourn): after pushing, the opening \"direction\" of the overlay might not make sense.\n      this._isPushed = true;\n      this._applyPosition(fallback.position, fallback.originPoint);\n      return;\n    }\n    // All options for getting the overlay within the viewport have been exhausted, so go with the\n    // position that went off-screen the least.\n    this._applyPosition(fallback.position, fallback.originPoint);\n  }\n  detach() {\n    this._clearPanelClasses();\n    this._lastPosition = null;\n    this._previousPushAmount = null;\n    this._resizeSubscription.unsubscribe();\n  }\n  /** Cleanup after the element gets destroyed. */\n  dispose() {\n    if (this._isDisposed) {\n      return;\n    }\n    // We can't use `_resetBoundingBoxStyles` here, because it resets\n    // some properties to zero, rather than removing them.\n    if (this._boundingBox) {\n      extendStyles(this._boundingBox.style, {\n        top: '',\n        left: '',\n        right: '',\n        bottom: '',\n        height: '',\n        width: '',\n        alignItems: '',\n        justifyContent: ''\n      });\n    }\n    if (this._pane) {\n      this._resetOverlayElementStyles();\n    }\n    if (this._overlayRef) {\n      this._overlayRef.hostElement.classList.remove(boundingBoxClass);\n    }\n    this.detach();\n    this._positionChanges.complete();\n    this._overlayRef = this._boundingBox = null;\n    this._isDisposed = true;\n  }\n  /**\n   * This re-aligns the overlay element with the trigger in its last calculated position,\n   * even if a position higher in the \"preferred positions\" list would now fit. This\n   * allows one to re-align the panel without changing the orientation of the panel.\n   */\n  reapplyLastPosition() {\n    if (this._isDisposed || !this._platform.isBrowser) {\n      return;\n    }\n    const lastPosition = this._lastPosition;\n    if (lastPosition) {\n      this._originRect = this._getOriginRect();\n      this._overlayRect = this._pane.getBoundingClientRect();\n      this._viewportRect = this._getNarrowedViewportRect();\n      this._containerRect = this._overlayContainer.getContainerElement().getBoundingClientRect();\n      const originPoint = this._getOriginPoint(this._originRect, this._containerRect, lastPosition);\n      this._applyPosition(lastPosition, originPoint);\n    } else {\n      this.apply();\n    }\n  }\n  /**\n   * Sets the list of Scrollable containers that host the origin element so that\n   * on reposition we can evaluate if it or the overlay has been clipped or outside view. Every\n   * Scrollable must be an ancestor element of the strategy's origin element.\n   */\n  withScrollableContainers(scrollables) {\n    this._scrollables = scrollables;\n    return this;\n  }\n  /**\n   * Adds new preferred positions.\n   * @param positions List of positions options for this overlay.\n   */\n  withPositions(positions) {\n    this._preferredPositions = positions;\n    // If the last calculated position object isn't part of the positions anymore, clear\n    // it in order to avoid it being picked up if the consumer tries to re-apply.\n    if (positions.indexOf(this._lastPosition) === -1) {\n      this._lastPosition = null;\n    }\n    this._validatePositions();\n    return this;\n  }\n  /**\n   * Sets a minimum distance the overlay may be positioned to the edge of the viewport.\n   * @param margin Required margin between the overlay and the viewport edge in pixels.\n   */\n  withViewportMargin(margin) {\n    this._viewportMargin = margin;\n    return this;\n  }\n  /** Sets whether the overlay's width and height can be constrained to fit within the viewport. */\n  withFlexibleDimensions(flexibleDimensions = true) {\n    this._hasFlexibleDimensions = flexibleDimensions;\n    return this;\n  }\n  /** Sets whether the overlay can grow after the initial open via flexible width/height. */\n  withGrowAfterOpen(growAfterOpen = true) {\n    this._growAfterOpen = growAfterOpen;\n    return this;\n  }\n  /** Sets whether the overlay can be pushed on-screen if none of the provided positions fit. */\n  withPush(canPush = true) {\n    this._canPush = canPush;\n    return this;\n  }\n  /**\n   * Sets whether the overlay's position should be locked in after it is positioned\n   * initially. When an overlay is locked in, it won't attempt to reposition itself\n   * when the position is re-applied (e.g. when the user scrolls away).\n   * @param isLocked Whether the overlay should locked in.\n   */\n  withLockedPosition(isLocked = true) {\n    this._positionLocked = isLocked;\n    return this;\n  }\n  /**\n   * Sets the origin, relative to which to position the overlay.\n   * Using an element origin is useful for building components that need to be positioned\n   * relatively to a trigger (e.g. dropdown menus or tooltips), whereas using a point can be\n   * used for cases like contextual menus which open relative to the user's pointer.\n   * @param origin Reference to the new origin.\n   */\n  setOrigin(origin) {\n    this._origin = origin;\n    return this;\n  }\n  /**\n   * Sets the default offset for the overlay's connection point on the x-axis.\n   * @param offset New offset in the X axis.\n   */\n  withDefaultOffsetX(offset) {\n    this._offsetX = offset;\n    return this;\n  }\n  /**\n   * Sets the default offset for the overlay's connection point on the y-axis.\n   * @param offset New offset in the Y axis.\n   */\n  withDefaultOffsetY(offset) {\n    this._offsetY = offset;\n    return this;\n  }\n  /**\n   * Configures that the position strategy should set a `transform-origin` on some elements\n   * inside the overlay, depending on the current position that is being applied. This is\n   * useful for the cases where the origin of an animation can change depending on the\n   * alignment of the overlay.\n   * @param selector CSS selector that will be used to find the target\n   *    elements onto which to set the transform origin.\n   */\n  withTransformOriginOn(selector) {\n    this._transformOriginSelector = selector;\n    return this;\n  }\n  /**\n   * Gets the (x, y) coordinate of a connection point on the origin based on a relative position.\n   */\n  _getOriginPoint(originRect, containerRect, pos) {\n    let x;\n    if (pos.originX == 'center') {\n      // Note: when centering we should always use the `left`\n      // offset, otherwise the position will be wrong in RTL.\n      x = originRect.left + originRect.width / 2;\n    } else {\n      const startX = this._isRtl() ? originRect.right : originRect.left;\n      const endX = this._isRtl() ? originRect.left : originRect.right;\n      x = pos.originX == 'start' ? startX : endX;\n    }\n    // When zooming in Safari the container rectangle contains negative values for the position\n    // and we need to re-add them to the calculated coordinates.\n    if (containerRect.left < 0) {\n      x -= containerRect.left;\n    }\n    let y;\n    if (pos.originY == 'center') {\n      y = originRect.top + originRect.height / 2;\n    } else {\n      y = pos.originY == 'top' ? originRect.top : originRect.bottom;\n    }\n    // Normally the containerRect's top value would be zero, however when the overlay is attached to an input\n    // (e.g. in an autocomplete), mobile browsers will shift everything in order to put the input in the middle\n    // of the screen and to make space for the virtual keyboard. We need to account for this offset,\n    // otherwise our positioning will be thrown off.\n    // Additionally, when zooming in Safari this fixes the vertical position.\n    if (containerRect.top < 0) {\n      y -= containerRect.top;\n    }\n    return {\n      x,\n      y\n    };\n  }\n  /**\n   * Gets the (x, y) coordinate of the top-left corner of the overlay given a given position and\n   * origin point to which the overlay should be connected.\n   */\n  _getOverlayPoint(originPoint, overlayRect, pos) {\n    // Calculate the (overlayStartX, overlayStartY), the start of the\n    // potential overlay position relative to the origin point.\n    let overlayStartX;\n    if (pos.overlayX == 'center') {\n      overlayStartX = -overlayRect.width / 2;\n    } else if (pos.overlayX === 'start') {\n      overlayStartX = this._isRtl() ? -overlayRect.width : 0;\n    } else {\n      overlayStartX = this._isRtl() ? 0 : -overlayRect.width;\n    }\n    let overlayStartY;\n    if (pos.overlayY == 'center') {\n      overlayStartY = -overlayRect.height / 2;\n    } else {\n      overlayStartY = pos.overlayY == 'top' ? 0 : -overlayRect.height;\n    }\n    // The (x, y) coordinates of the overlay.\n    return {\n      x: originPoint.x + overlayStartX,\n      y: originPoint.y + overlayStartY\n    };\n  }\n  /** Gets how well an overlay at the given point will fit within the viewport. */\n  _getOverlayFit(point, rawOverlayRect, viewport, position) {\n    // Round the overlay rect when comparing against the\n    // viewport, because the viewport is always rounded.\n    const overlay = getRoundedBoundingClientRect(rawOverlayRect);\n    let {\n      x,\n      y\n    } = point;\n    let offsetX = this._getOffset(position, 'x');\n    let offsetY = this._getOffset(position, 'y');\n    // Account for the offsets since they could push the overlay out of the viewport.\n    if (offsetX) {\n      x += offsetX;\n    }\n    if (offsetY) {\n      y += offsetY;\n    }\n    // How much the overlay would overflow at this position, on each side.\n    let leftOverflow = 0 - x;\n    let rightOverflow = x + overlay.width - viewport.width;\n    let topOverflow = 0 - y;\n    let bottomOverflow = y + overlay.height - viewport.height;\n    // Visible parts of the element on each axis.\n    let visibleWidth = this._subtractOverflows(overlay.width, leftOverflow, rightOverflow);\n    let visibleHeight = this._subtractOverflows(overlay.height, topOverflow, bottomOverflow);\n    let visibleArea = visibleWidth * visibleHeight;\n    return {\n      visibleArea,\n      isCompletelyWithinViewport: overlay.width * overlay.height === visibleArea,\n      fitsInViewportVertically: visibleHeight === overlay.height,\n      fitsInViewportHorizontally: visibleWidth == overlay.width\n    };\n  }\n  /**\n   * Whether the overlay can fit within the viewport when it may resize either its width or height.\n   * @param fit How well the overlay fits in the viewport at some position.\n   * @param point The (x, y) coordinates of the overlay at some position.\n   * @param viewport The geometry of the viewport.\n   */\n  _canFitWithFlexibleDimensions(fit, point, viewport) {\n    if (this._hasFlexibleDimensions) {\n      const availableHeight = viewport.bottom - point.y;\n      const availableWidth = viewport.right - point.x;\n      const minHeight = getPixelValue(this._overlayRef.getConfig().minHeight);\n      const minWidth = getPixelValue(this._overlayRef.getConfig().minWidth);\n      const verticalFit = fit.fitsInViewportVertically || minHeight != null && minHeight <= availableHeight;\n      const horizontalFit = fit.fitsInViewportHorizontally || minWidth != null && minWidth <= availableWidth;\n      return verticalFit && horizontalFit;\n    }\n    return false;\n  }\n  /**\n   * Gets the point at which the overlay can be \"pushed\" on-screen. If the overlay is larger than\n   * the viewport, the top-left corner will be pushed on-screen (with overflow occurring on the\n   * right and bottom).\n   *\n   * @param start Starting point from which the overlay is pushed.\n   * @param rawOverlayRect Dimensions of the overlay.\n   * @param scrollPosition Current viewport scroll position.\n   * @returns The point at which to position the overlay after pushing. This is effectively a new\n   *     originPoint.\n   */\n  _pushOverlayOnScreen(start, rawOverlayRect, scrollPosition) {\n    // If the position is locked and we've pushed the overlay already, reuse the previous push\n    // amount, rather than pushing it again. If we were to continue pushing, the element would\n    // remain in the viewport, which goes against the expectations when position locking is enabled.\n    if (this._previousPushAmount && this._positionLocked) {\n      return {\n        x: start.x + this._previousPushAmount.x,\n        y: start.y + this._previousPushAmount.y\n      };\n    }\n    // Round the overlay rect when comparing against the\n    // viewport, because the viewport is always rounded.\n    const overlay = getRoundedBoundingClientRect(rawOverlayRect);\n    const viewport = this._viewportRect;\n    // Determine how much the overlay goes outside the viewport on each\n    // side, which we'll use to decide which direction to push it.\n    const overflowRight = Math.max(start.x + overlay.width - viewport.width, 0);\n    const overflowBottom = Math.max(start.y + overlay.height - viewport.height, 0);\n    const overflowTop = Math.max(viewport.top - scrollPosition.top - start.y, 0);\n    const overflowLeft = Math.max(viewport.left - scrollPosition.left - start.x, 0);\n    // Amount by which to push the overlay in each axis such that it remains on-screen.\n    let pushX = 0;\n    let pushY = 0;\n    // If the overlay fits completely within the bounds of the viewport, push it from whichever\n    // direction is goes off-screen. Otherwise, push the top-left corner such that its in the\n    // viewport and allow for the trailing end of the overlay to go out of bounds.\n    if (overlay.width <= viewport.width) {\n      pushX = overflowLeft || -overflowRight;\n    } else {\n      pushX = start.x < this._viewportMargin ? viewport.left - scrollPosition.left - start.x : 0;\n    }\n    if (overlay.height <= viewport.height) {\n      pushY = overflowTop || -overflowBottom;\n    } else {\n      pushY = start.y < this._viewportMargin ? viewport.top - scrollPosition.top - start.y : 0;\n    }\n    this._previousPushAmount = {\n      x: pushX,\n      y: pushY\n    };\n    return {\n      x: start.x + pushX,\n      y: start.y + pushY\n    };\n  }\n  /**\n   * Applies a computed position to the overlay and emits a position change.\n   * @param position The position preference\n   * @param originPoint The point on the origin element where the overlay is connected.\n   */\n  _applyPosition(position, originPoint) {\n    this._setTransformOrigin(position);\n    this._setOverlayElementStyles(originPoint, position);\n    this._setBoundingBoxStyles(originPoint, position);\n    if (position.panelClass) {\n      this._addPanelClasses(position.panelClass);\n    }\n    // Save the last connected position in case the position needs to be re-calculated.\n    this._lastPosition = position;\n    // Notify that the position has been changed along with its change properties.\n    // We only emit if we've got any subscriptions, because the scroll visibility\n    // calculations can be somewhat expensive.\n    if (this._positionChanges.observers.length) {\n      const scrollableViewProperties = this._getScrollVisibility();\n      const changeEvent = new ConnectedOverlayPositionChange(position, scrollableViewProperties);\n      this._positionChanges.next(changeEvent);\n    }\n    this._isInitialRender = false;\n  }\n  /** Sets the transform origin based on the configured selector and the passed-in position.  */\n  _setTransformOrigin(position) {\n    if (!this._transformOriginSelector) {\n      return;\n    }\n    const elements = this._boundingBox.querySelectorAll(this._transformOriginSelector);\n    let xOrigin;\n    let yOrigin = position.overlayY;\n    if (position.overlayX === 'center') {\n      xOrigin = 'center';\n    } else if (this._isRtl()) {\n      xOrigin = position.overlayX === 'start' ? 'right' : 'left';\n    } else {\n      xOrigin = position.overlayX === 'start' ? 'left' : 'right';\n    }\n    for (let i = 0; i < elements.length; i++) {\n      elements[i].style.transformOrigin = `${xOrigin} ${yOrigin}`;\n    }\n  }\n  /**\n   * Gets the position and size of the overlay's sizing container.\n   *\n   * This method does no measuring and applies no styles so that we can cheaply compute the\n   * bounds for all positions and choose the best fit based on these results.\n   */\n  _calculateBoundingBoxRect(origin, position) {\n    const viewport = this._viewportRect;\n    const isRtl = this._isRtl();\n    let height, top, bottom;\n    if (position.overlayY === 'top') {\n      // Overlay is opening \"downward\" and thus is bound by the bottom viewport edge.\n      top = origin.y;\n      height = viewport.height - top + this._viewportMargin;\n    } else if (position.overlayY === 'bottom') {\n      // Overlay is opening \"upward\" and thus is bound by the top viewport edge. We need to add\n      // the viewport margin back in, because the viewport rect is narrowed down to remove the\n      // margin, whereas the `origin` position is calculated based on its `ClientRect`.\n      bottom = viewport.height - origin.y + this._viewportMargin * 2;\n      height = viewport.height - bottom + this._viewportMargin;\n    } else {\n      // If neither top nor bottom, it means that the overlay is vertically centered on the\n      // origin point. Note that we want the position relative to the viewport, rather than\n      // the page, which is why we don't use something like `viewport.bottom - origin.y` and\n      // `origin.y - viewport.top`.\n      const smallestDistanceToViewportEdge = Math.min(viewport.bottom - origin.y + viewport.top, origin.y);\n      const previousHeight = this._lastBoundingBoxSize.height;\n      height = smallestDistanceToViewportEdge * 2;\n      top = origin.y - smallestDistanceToViewportEdge;\n      if (height > previousHeight && !this._isInitialRender && !this._growAfterOpen) {\n        top = origin.y - previousHeight / 2;\n      }\n    }\n    // The overlay is opening 'right-ward' (the content flows to the right).\n    const isBoundedByRightViewportEdge = position.overlayX === 'start' && !isRtl || position.overlayX === 'end' && isRtl;\n    // The overlay is opening 'left-ward' (the content flows to the left).\n    const isBoundedByLeftViewportEdge = position.overlayX === 'end' && !isRtl || position.overlayX === 'start' && isRtl;\n    let width, left, right;\n    if (isBoundedByLeftViewportEdge) {\n      right = viewport.width - origin.x + this._viewportMargin;\n      width = origin.x - this._viewportMargin;\n    } else if (isBoundedByRightViewportEdge) {\n      left = origin.x;\n      width = viewport.right - origin.x;\n    } else {\n      // If neither start nor end, it means that the overlay is horizontally centered on the\n      // origin point. Note that we want the position relative to the viewport, rather than\n      // the page, which is why we don't use something like `viewport.right - origin.x` and\n      // `origin.x - viewport.left`.\n      const smallestDistanceToViewportEdge = Math.min(viewport.right - origin.x + viewport.left, origin.x);\n      const previousWidth = this._lastBoundingBoxSize.width;\n      width = smallestDistanceToViewportEdge * 2;\n      left = origin.x - smallestDistanceToViewportEdge;\n      if (width > previousWidth && !this._isInitialRender && !this._growAfterOpen) {\n        left = origin.x - previousWidth / 2;\n      }\n    }\n    return {\n      top: top,\n      left: left,\n      bottom: bottom,\n      right: right,\n      width,\n      height\n    };\n  }\n  /**\n   * Sets the position and size of the overlay's sizing wrapper. The wrapper is positioned on the\n   * origin's connection point and stretches to the bounds of the viewport.\n   *\n   * @param origin The point on the origin element where the overlay is connected.\n   * @param position The position preference\n   */\n  _setBoundingBoxStyles(origin, position) {\n    const boundingBoxRect = this._calculateBoundingBoxRect(origin, position);\n    // It's weird if the overlay *grows* while scrolling, so we take the last size into account\n    // when applying a new size.\n    if (!this._isInitialRender && !this._growAfterOpen) {\n      boundingBoxRect.height = Math.min(boundingBoxRect.height, this._lastBoundingBoxSize.height);\n      boundingBoxRect.width = Math.min(boundingBoxRect.width, this._lastBoundingBoxSize.width);\n    }\n    const styles = {};\n    if (this._hasExactPosition()) {\n      styles.top = styles.left = '0';\n      styles.bottom = styles.right = styles.maxHeight = styles.maxWidth = '';\n      styles.width = styles.height = '100%';\n    } else {\n      const maxHeight = this._overlayRef.getConfig().maxHeight;\n      const maxWidth = this._overlayRef.getConfig().maxWidth;\n      styles.height = coerceCssPixelValue(boundingBoxRect.height);\n      styles.top = coerceCssPixelValue(boundingBoxRect.top);\n      styles.bottom = coerceCssPixelValue(boundingBoxRect.bottom);\n      styles.width = coerceCssPixelValue(boundingBoxRect.width);\n      styles.left = coerceCssPixelValue(boundingBoxRect.left);\n      styles.right = coerceCssPixelValue(boundingBoxRect.right);\n      // Push the pane content towards the proper direction.\n      if (position.overlayX === 'center') {\n        styles.alignItems = 'center';\n      } else {\n        styles.alignItems = position.overlayX === 'end' ? 'flex-end' : 'flex-start';\n      }\n      if (position.overlayY === 'center') {\n        styles.justifyContent = 'center';\n      } else {\n        styles.justifyContent = position.overlayY === 'bottom' ? 'flex-end' : 'flex-start';\n      }\n      if (maxHeight) {\n        styles.maxHeight = coerceCssPixelValue(maxHeight);\n      }\n      if (maxWidth) {\n        styles.maxWidth = coerceCssPixelValue(maxWidth);\n      }\n    }\n    this._lastBoundingBoxSize = boundingBoxRect;\n    extendStyles(this._boundingBox.style, styles);\n  }\n  /** Resets the styles for the bounding box so that a new positioning can be computed. */\n  _resetBoundingBoxStyles() {\n    extendStyles(this._boundingBox.style, {\n      top: '0',\n      left: '0',\n      right: '0',\n      bottom: '0',\n      height: '',\n      width: '',\n      alignItems: '',\n      justifyContent: ''\n    });\n  }\n  /** Resets the styles for the overlay pane so that a new positioning can be computed. */\n  _resetOverlayElementStyles() {\n    extendStyles(this._pane.style, {\n      top: '',\n      left: '',\n      bottom: '',\n      right: '',\n      position: '',\n      transform: ''\n    });\n  }\n  /** Sets positioning styles to the overlay element. */\n  _setOverlayElementStyles(originPoint, position) {\n    const styles = {};\n    const hasExactPosition = this._hasExactPosition();\n    const hasFlexibleDimensions = this._hasFlexibleDimensions;\n    const config = this._overlayRef.getConfig();\n    if (hasExactPosition) {\n      const scrollPosition = this._viewportRuler.getViewportScrollPosition();\n      extendStyles(styles, this._getExactOverlayY(position, originPoint, scrollPosition));\n      extendStyles(styles, this._getExactOverlayX(position, originPoint, scrollPosition));\n    } else {\n      styles.position = 'static';\n    }\n    // Use a transform to apply the offsets. We do this because the `center` positions rely on\n    // being in the normal flex flow and setting a `top` / `left` at all will completely throw\n    // off the position. We also can't use margins, because they won't have an effect in some\n    // cases where the element doesn't have anything to \"push off of\". Finally, this works\n    // better both with flexible and non-flexible positioning.\n    let transformString = '';\n    let offsetX = this._getOffset(position, 'x');\n    let offsetY = this._getOffset(position, 'y');\n    if (offsetX) {\n      transformString += `translateX(${offsetX}px) `;\n    }\n    if (offsetY) {\n      transformString += `translateY(${offsetY}px)`;\n    }\n    styles.transform = transformString.trim();\n    // If a maxWidth or maxHeight is specified on the overlay, we remove them. We do this because\n    // we need these values to both be set to \"100%\" for the automatic flexible sizing to work.\n    // The maxHeight and maxWidth are set on the boundingBox in order to enforce the constraint.\n    // Note that this doesn't apply when we have an exact position, in which case we do want to\n    // apply them because they'll be cleared from the bounding box.\n    if (config.maxHeight) {\n      if (hasExactPosition) {\n        styles.maxHeight = coerceCssPixelValue(config.maxHeight);\n      } else if (hasFlexibleDimensions) {\n        styles.maxHeight = '';\n      }\n    }\n    if (config.maxWidth) {\n      if (hasExactPosition) {\n        styles.maxWidth = coerceCssPixelValue(config.maxWidth);\n      } else if (hasFlexibleDimensions) {\n        styles.maxWidth = '';\n      }\n    }\n    extendStyles(this._pane.style, styles);\n  }\n  /** Gets the exact top/bottom for the overlay when not using flexible sizing or when pushing. */\n  _getExactOverlayY(position, originPoint, scrollPosition) {\n    // Reset any existing styles. This is necessary in case the\n    // preferred position has changed since the last `apply`.\n    let styles = {\n      top: '',\n      bottom: ''\n    };\n    let overlayPoint = this._getOverlayPoint(originPoint, this._overlayRect, position);\n    if (this._isPushed) {\n      overlayPoint = this._pushOverlayOnScreen(overlayPoint, this._overlayRect, scrollPosition);\n    }\n    // We want to set either `top` or `bottom` based on whether the overlay wants to appear\n    // above or below the origin and the direction in which the element will expand.\n    if (position.overlayY === 'bottom') {\n      // When using `bottom`, we adjust the y position such that it is the distance\n      // from the bottom of the viewport rather than the top.\n      const documentHeight = this._document.documentElement.clientHeight;\n      styles.bottom = `${documentHeight - (overlayPoint.y + this._overlayRect.height)}px`;\n    } else {\n      styles.top = coerceCssPixelValue(overlayPoint.y);\n    }\n    return styles;\n  }\n  /** Gets the exact left/right for the overlay when not using flexible sizing or when pushing. */\n  _getExactOverlayX(position, originPoint, scrollPosition) {\n    // Reset any existing styles. This is necessary in case the preferred position has\n    // changed since the last `apply`.\n    let styles = {\n      left: '',\n      right: ''\n    };\n    let overlayPoint = this._getOverlayPoint(originPoint, this._overlayRect, position);\n    if (this._isPushed) {\n      overlayPoint = this._pushOverlayOnScreen(overlayPoint, this._overlayRect, scrollPosition);\n    }\n    // We want to set either `left` or `right` based on whether the overlay wants to appear \"before\"\n    // or \"after\" the origin, which determines the direction in which the element will expand.\n    // For the horizontal axis, the meaning of \"before\" and \"after\" change based on whether the\n    // page is in RTL or LTR.\n    let horizontalStyleProperty;\n    if (this._isRtl()) {\n      horizontalStyleProperty = position.overlayX === 'end' ? 'left' : 'right';\n    } else {\n      horizontalStyleProperty = position.overlayX === 'end' ? 'right' : 'left';\n    }\n    // When we're setting `right`, we adjust the x position such that it is the distance\n    // from the right edge of the viewport rather than the left edge.\n    if (horizontalStyleProperty === 'right') {\n      const documentWidth = this._document.documentElement.clientWidth;\n      styles.right = `${documentWidth - (overlayPoint.x + this._overlayRect.width)}px`;\n    } else {\n      styles.left = coerceCssPixelValue(overlayPoint.x);\n    }\n    return styles;\n  }\n  /**\n   * Gets the view properties of the trigger and overlay, including whether they are clipped\n   * or completely outside the view of any of the strategy's scrollables.\n   */\n  _getScrollVisibility() {\n    // Note: needs fresh rects since the position could've changed.\n    const originBounds = this._getOriginRect();\n    const overlayBounds = this._pane.getBoundingClientRect();\n    // TODO(jelbourn): instead of needing all of the client rects for these scrolling containers\n    // every time, we should be able to use the scrollTop of the containers if the size of those\n    // containers hasn't changed.\n    const scrollContainerBounds = this._scrollables.map(scrollable => {\n      return scrollable.getElementRef().nativeElement.getBoundingClientRect();\n    });\n    return {\n      isOriginClipped: isElementClippedByScrolling(originBounds, scrollContainerBounds),\n      isOriginOutsideView: isElementScrolledOutsideView(originBounds, scrollContainerBounds),\n      isOverlayClipped: isElementClippedByScrolling(overlayBounds, scrollContainerBounds),\n      isOverlayOutsideView: isElementScrolledOutsideView(overlayBounds, scrollContainerBounds)\n    };\n  }\n  /** Subtracts the amount that an element is overflowing on an axis from its length. */\n  _subtractOverflows(length, ...overflows) {\n    return overflows.reduce((currentValue, currentOverflow) => {\n      return currentValue - Math.max(currentOverflow, 0);\n    }, length);\n  }\n  /** Narrows the given viewport rect by the current _viewportMargin. */\n  _getNarrowedViewportRect() {\n    // We recalculate the viewport rect here ourselves, rather than using the ViewportRuler,\n    // because we want to use the `clientWidth` and `clientHeight` as the base. The difference\n    // being that the client properties don't include the scrollbar, as opposed to `innerWidth`\n    // and `innerHeight` that do. This is necessary, because the overlay container uses\n    // 100% `width` and `height` which don't include the scrollbar either.\n    const width = this._document.documentElement.clientWidth;\n    const height = this._document.documentElement.clientHeight;\n    const scrollPosition = this._viewportRuler.getViewportScrollPosition();\n    return {\n      top: scrollPosition.top + this._viewportMargin,\n      left: scrollPosition.left + this._viewportMargin,\n      right: scrollPosition.left + width - this._viewportMargin,\n      bottom: scrollPosition.top + height - this._viewportMargin,\n      width: width - 2 * this._viewportMargin,\n      height: height - 2 * this._viewportMargin\n    };\n  }\n  /** Whether the we're dealing with an RTL context */\n  _isRtl() {\n    return this._overlayRef.getDirection() === 'rtl';\n  }\n  /** Determines whether the overlay uses exact or flexible positioning. */\n  _hasExactPosition() {\n    return !this._hasFlexibleDimensions || this._isPushed;\n  }\n  /** Retrieves the offset of a position along the x or y axis. */\n  _getOffset(position, axis) {\n    if (axis === 'x') {\n      // We don't do something like `position['offset' + axis]` in\n      // order to avoid breaking minifiers that rename properties.\n      return position.offsetX == null ? this._offsetX : position.offsetX;\n    }\n    return position.offsetY == null ? this._offsetY : position.offsetY;\n  }\n  /** Validates that the current position match the expected values. */\n  _validatePositions() {\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      if (!this._preferredPositions.length) {\n        throw Error('FlexibleConnectedPositionStrategy: At least one position is required.');\n      }\n      // TODO(crisbeto): remove these once Angular's template type\n      // checking is advanced enough to catch these cases.\n      this._preferredPositions.forEach(pair => {\n        validateHorizontalPosition('originX', pair.originX);\n        validateVerticalPosition('originY', pair.originY);\n        validateHorizontalPosition('overlayX', pair.overlayX);\n        validateVerticalPosition('overlayY', pair.overlayY);\n      });\n    }\n  }\n  /** Adds a single CSS class or an array of classes on the overlay panel. */\n  _addPanelClasses(cssClasses) {\n    if (this._pane) {\n      coerceArray(cssClasses).forEach(cssClass => {\n        if (cssClass !== '' && this._appliedPanelClasses.indexOf(cssClass) === -1) {\n          this._appliedPanelClasses.push(cssClass);\n          this._pane.classList.add(cssClass);\n        }\n      });\n    }\n  }\n  /** Clears the classes that the position strategy has applied from the overlay panel. */\n  _clearPanelClasses() {\n    if (this._pane) {\n      this._appliedPanelClasses.forEach(cssClass => {\n        this._pane.classList.remove(cssClass);\n      });\n      this._appliedPanelClasses = [];\n    }\n  }\n  /** Returns the ClientRect of the current origin. */\n  _getOriginRect() {\n    const origin = this._origin;\n    if (origin instanceof ElementRef) {\n      return origin.nativeElement.getBoundingClientRect();\n    }\n    // Check for Element so SVG elements are also supported.\n    if (origin instanceof Element) {\n      return origin.getBoundingClientRect();\n    }\n    const width = origin.width || 0;\n    const height = origin.height || 0;\n    // If the origin is a point, return a client rect as if it was a 0x0 element at the point.\n    return {\n      top: origin.y,\n      bottom: origin.y + height,\n      left: origin.x,\n      right: origin.x + width,\n      height,\n      width\n    };\n  }\n}\n/** Shallow-extends a stylesheet object with another stylesheet object. */\nfunction extendStyles(destination, source) {\n  for (let key in source) {\n    if (source.hasOwnProperty(key)) {\n      destination[key] = source[key];\n    }\n  }\n  return destination;\n}\n/**\n * Extracts the pixel value as a number from a value, if it's a number\n * or a CSS pixel string (e.g. `1337px`). Otherwise returns null.\n */\nfunction getPixelValue(input) {\n  if (typeof input !== 'number' && input != null) {\n    const [value, units] = input.split(cssUnitPattern);\n    return !units || units === 'px' ? parseFloat(value) : null;\n  }\n  return input || null;\n}\n/**\n * Gets a version of an element's bounding `ClientRect` where all the values are rounded down to\n * the nearest pixel. This allows us to account for the cases where there may be sub-pixel\n * deviations in the `ClientRect` returned by the browser (e.g. when zoomed in with a percentage\n * size, see #21350).\n */\nfunction getRoundedBoundingClientRect(clientRect) {\n  return {\n    top: Math.floor(clientRect.top),\n    right: Math.floor(clientRect.right),\n    bottom: Math.floor(clientRect.bottom),\n    left: Math.floor(clientRect.left),\n    width: Math.floor(clientRect.width),\n    height: Math.floor(clientRect.height)\n  };\n}\nconst STANDARD_DROPDOWN_BELOW_POSITIONS = [{\n  originX: 'start',\n  originY: 'bottom',\n  overlayX: 'start',\n  overlayY: 'top'\n}, {\n  originX: 'start',\n  originY: 'top',\n  overlayX: 'start',\n  overlayY: 'bottom'\n}, {\n  originX: 'end',\n  originY: 'bottom',\n  overlayX: 'end',\n  overlayY: 'top'\n}, {\n  originX: 'end',\n  originY: 'top',\n  overlayX: 'end',\n  overlayY: 'bottom'\n}];\nconst STANDARD_DROPDOWN_ADJACENT_POSITIONS = [{\n  originX: 'end',\n  originY: 'top',\n  overlayX: 'start',\n  overlayY: 'top'\n}, {\n  originX: 'end',\n  originY: 'bottom',\n  overlayX: 'start',\n  overlayY: 'bottom'\n}, {\n  originX: 'start',\n  originY: 'top',\n  overlayX: 'end',\n  overlayY: 'top'\n}, {\n  originX: 'start',\n  originY: 'bottom',\n  overlayX: 'end',\n  overlayY: 'bottom'\n}];\n\n/** Class to be added to the overlay pane wrapper. */\nconst wrapperClass = 'cdk-global-overlay-wrapper';\n/**\n * A strategy for positioning overlays. Using this strategy, an overlay is given an\n * explicit position relative to the browser's viewport. We use flexbox, instead of\n * transforms, in order to avoid issues with subpixel rendering which can cause the\n * element to become blurry.\n */\nclass GlobalPositionStrategy {\n  constructor() {\n    this._cssPosition = 'static';\n    this._topOffset = '';\n    this._bottomOffset = '';\n    this._alignItems = '';\n    this._xPosition = '';\n    this._xOffset = '';\n    this._width = '';\n    this._height = '';\n    this._isDisposed = false;\n  }\n  attach(overlayRef) {\n    const config = overlayRef.getConfig();\n    this._overlayRef = overlayRef;\n    if (this._width && !config.width) {\n      overlayRef.updateSize({\n        width: this._width\n      });\n    }\n    if (this._height && !config.height) {\n      overlayRef.updateSize({\n        height: this._height\n      });\n    }\n    overlayRef.hostElement.classList.add(wrapperClass);\n    this._isDisposed = false;\n  }\n  /**\n   * Sets the top position of the overlay. Clears any previously set vertical position.\n   * @param value New top offset.\n   */\n  top(value = '') {\n    this._bottomOffset = '';\n    this._topOffset = value;\n    this._alignItems = 'flex-start';\n    return this;\n  }\n  /**\n   * Sets the left position of the overlay. Clears any previously set horizontal position.\n   * @param value New left offset.\n   */\n  left(value = '') {\n    this._xOffset = value;\n    this._xPosition = 'left';\n    return this;\n  }\n  /**\n   * Sets the bottom position of the overlay. Clears any previously set vertical position.\n   * @param value New bottom offset.\n   */\n  bottom(value = '') {\n    this._topOffset = '';\n    this._bottomOffset = value;\n    this._alignItems = 'flex-end';\n    return this;\n  }\n  /**\n   * Sets the right position of the overlay. Clears any previously set horizontal position.\n   * @param value New right offset.\n   */\n  right(value = '') {\n    this._xOffset = value;\n    this._xPosition = 'right';\n    return this;\n  }\n  /**\n   * Sets the overlay to the start of the viewport, depending on the overlay direction.\n   * This will be to the left in LTR layouts and to the right in RTL.\n   * @param offset Offset from the edge of the screen.\n   */\n  start(value = '') {\n    this._xOffset = value;\n    this._xPosition = 'start';\n    return this;\n  }\n  /**\n   * Sets the overlay to the end of the viewport, depending on the overlay direction.\n   * This will be to the right in LTR layouts and to the left in RTL.\n   * @param offset Offset from the edge of the screen.\n   */\n  end(value = '') {\n    this._xOffset = value;\n    this._xPosition = 'end';\n    return this;\n  }\n  /**\n   * Sets the overlay width and clears any previously set width.\n   * @param value New width for the overlay\n   * @deprecated Pass the `width` through the `OverlayConfig`.\n   * @breaking-change 8.0.0\n   */\n  width(value = '') {\n    if (this._overlayRef) {\n      this._overlayRef.updateSize({\n        width: value\n      });\n    } else {\n      this._width = value;\n    }\n    return this;\n  }\n  /**\n   * Sets the overlay height and clears any previously set height.\n   * @param value New height for the overlay\n   * @deprecated Pass the `height` through the `OverlayConfig`.\n   * @breaking-change 8.0.0\n   */\n  height(value = '') {\n    if (this._overlayRef) {\n      this._overlayRef.updateSize({\n        height: value\n      });\n    } else {\n      this._height = value;\n    }\n    return this;\n  }\n  /**\n   * Centers the overlay horizontally with an optional offset.\n   * Clears any previously set horizontal position.\n   *\n   * @param offset Overlay offset from the horizontal center.\n   */\n  centerHorizontally(offset = '') {\n    this.left(offset);\n    this._xPosition = 'center';\n    return this;\n  }\n  /**\n   * Centers the overlay vertically with an optional offset.\n   * Clears any previously set vertical position.\n   *\n   * @param offset Overlay offset from the vertical center.\n   */\n  centerVertically(offset = '') {\n    this.top(offset);\n    this._alignItems = 'center';\n    return this;\n  }\n  /**\n   * Apply the position to the element.\n   * @docs-private\n   */\n  apply() {\n    // Since the overlay ref applies the strategy asynchronously, it could\n    // have been disposed before it ends up being applied. If that is the\n    // case, we shouldn't do anything.\n    if (!this._overlayRef || !this._overlayRef.hasAttached()) {\n      return;\n    }\n    const styles = this._overlayRef.overlayElement.style;\n    const parentStyles = this._overlayRef.hostElement.style;\n    const config = this._overlayRef.getConfig();\n    const {\n      width,\n      height,\n      maxWidth,\n      maxHeight\n    } = config;\n    const shouldBeFlushHorizontally = (width === '100%' || width === '100vw') && (!maxWidth || maxWidth === '100%' || maxWidth === '100vw');\n    const shouldBeFlushVertically = (height === '100%' || height === '100vh') && (!maxHeight || maxHeight === '100%' || maxHeight === '100vh');\n    const xPosition = this._xPosition;\n    const xOffset = this._xOffset;\n    const isRtl = this._overlayRef.getConfig().direction === 'rtl';\n    let marginLeft = '';\n    let marginRight = '';\n    let justifyContent = '';\n    if (shouldBeFlushHorizontally) {\n      justifyContent = 'flex-start';\n    } else if (xPosition === 'center') {\n      justifyContent = 'center';\n      if (isRtl) {\n        marginRight = xOffset;\n      } else {\n        marginLeft = xOffset;\n      }\n    } else if (isRtl) {\n      if (xPosition === 'left' || xPosition === 'end') {\n        justifyContent = 'flex-end';\n        marginLeft = xOffset;\n      } else if (xPosition === 'right' || xPosition === 'start') {\n        justifyContent = 'flex-start';\n        marginRight = xOffset;\n      }\n    } else if (xPosition === 'left' || xPosition === 'start') {\n      justifyContent = 'flex-start';\n      marginLeft = xOffset;\n    } else if (xPosition === 'right' || xPosition === 'end') {\n      justifyContent = 'flex-end';\n      marginRight = xOffset;\n    }\n    styles.position = this._cssPosition;\n    styles.marginLeft = shouldBeFlushHorizontally ? '0' : marginLeft;\n    styles.marginTop = shouldBeFlushVertically ? '0' : this._topOffset;\n    styles.marginBottom = this._bottomOffset;\n    styles.marginRight = shouldBeFlushHorizontally ? '0' : marginRight;\n    parentStyles.justifyContent = justifyContent;\n    parentStyles.alignItems = shouldBeFlushVertically ? 'flex-start' : this._alignItems;\n  }\n  /**\n   * Cleans up the DOM changes from the position strategy.\n   * @docs-private\n   */\n  dispose() {\n    if (this._isDisposed || !this._overlayRef) {\n      return;\n    }\n    const styles = this._overlayRef.overlayElement.style;\n    const parent = this._overlayRef.hostElement;\n    const parentStyles = parent.style;\n    parent.classList.remove(wrapperClass);\n    parentStyles.justifyContent = parentStyles.alignItems = styles.marginTop = styles.marginBottom = styles.marginLeft = styles.marginRight = styles.position = '';\n    this._overlayRef = null;\n    this._isDisposed = true;\n  }\n}\n\n/** Builder for overlay position strategy. */\nclass OverlayPositionBuilder {\n  constructor(_viewportRuler, _document, _platform, _overlayContainer) {\n    this._viewportRuler = _viewportRuler;\n    this._document = _document;\n    this._platform = _platform;\n    this._overlayContainer = _overlayContainer;\n  }\n  /**\n   * Creates a global position strategy.\n   */\n  global() {\n    return new GlobalPositionStrategy();\n  }\n  /**\n   * Creates a flexible position strategy.\n   * @param origin Origin relative to which to position the overlay.\n   */\n  flexibleConnectedTo(origin) {\n    return new FlexibleConnectedPositionStrategy(origin, this._viewportRuler, this._document, this._platform, this._overlayContainer);\n  }\n  static {\n    this.ɵfac = function OverlayPositionBuilder_Factory(t) {\n      return new (t || OverlayPositionBuilder)(i0.ɵɵinject(i1.ViewportRuler), i0.ɵɵinject(DOCUMENT), i0.ɵɵinject(i1$1.Platform), i0.ɵɵinject(OverlayContainer));\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: OverlayPositionBuilder,\n      factory: OverlayPositionBuilder.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(OverlayPositionBuilder, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], () => [{\n    type: i1.ViewportRuler\n  }, {\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }, {\n    type: i1$1.Platform\n  }, {\n    type: OverlayContainer\n  }], null);\n})();\n\n/** Next overlay unique ID. */\nlet nextUniqueId = 0;\n// Note that Overlay is *not* scoped to the app root because of the ComponentFactoryResolver\n// which needs to be different depending on where OverlayModule is imported.\n/**\n * Service to create Overlays. Overlays are dynamically added pieces of floating UI, meant to be\n * used as a low-level building block for other components. Dialogs, tooltips, menus,\n * selects, etc. can all be built using overlays. The service should primarily be used by authors\n * of re-usable components rather than developers building end-user applications.\n *\n * An overlay *is* a PortalOutlet, so any kind of Portal can be loaded into one.\n */\nclass Overlay {\n  constructor( /** Scrolling strategies that can be used when creating an overlay. */\n  scrollStrategies, _overlayContainer, _componentFactoryResolver, _positionBuilder, _keyboardDispatcher, _injector, _ngZone, _document, _directionality, _location, _outsideClickDispatcher, _animationsModuleType) {\n    this.scrollStrategies = scrollStrategies;\n    this._overlayContainer = _overlayContainer;\n    this._componentFactoryResolver = _componentFactoryResolver;\n    this._positionBuilder = _positionBuilder;\n    this._keyboardDispatcher = _keyboardDispatcher;\n    this._injector = _injector;\n    this._ngZone = _ngZone;\n    this._document = _document;\n    this._directionality = _directionality;\n    this._location = _location;\n    this._outsideClickDispatcher = _outsideClickDispatcher;\n    this._animationsModuleType = _animationsModuleType;\n  }\n  /**\n   * Creates an overlay.\n   * @param config Configuration applied to the overlay.\n   * @returns Reference to the created overlay.\n   */\n  create(config) {\n    const host = this._createHostElement();\n    const pane = this._createPaneElement(host);\n    const portalOutlet = this._createPortalOutlet(pane);\n    const overlayConfig = new OverlayConfig(config);\n    overlayConfig.direction = overlayConfig.direction || this._directionality.value;\n    return new OverlayRef(portalOutlet, host, pane, overlayConfig, this._ngZone, this._keyboardDispatcher, this._document, this._location, this._outsideClickDispatcher, this._animationsModuleType === 'NoopAnimations');\n  }\n  /**\n   * Gets a position builder that can be used, via fluent API,\n   * to construct and configure a position strategy.\n   * @returns An overlay position builder.\n   */\n  position() {\n    return this._positionBuilder;\n  }\n  /**\n   * Creates the DOM element for an overlay and appends it to the overlay container.\n   * @returns Newly-created pane element\n   */\n  _createPaneElement(host) {\n    const pane = this._document.createElement('div');\n    pane.id = `cdk-overlay-${nextUniqueId++}`;\n    pane.classList.add('cdk-overlay-pane');\n    host.appendChild(pane);\n    return pane;\n  }\n  /**\n   * Creates the host element that wraps around an overlay\n   * and can be used for advanced positioning.\n   * @returns Newly-create host element.\n   */\n  _createHostElement() {\n    const host = this._document.createElement('div');\n    this._overlayContainer.getContainerElement().appendChild(host);\n    return host;\n  }\n  /**\n   * Create a DomPortalOutlet into which the overlay content can be loaded.\n   * @param pane The DOM element to turn into a portal outlet.\n   * @returns A portal outlet for the given DOM element.\n   */\n  _createPortalOutlet(pane) {\n    // We have to resolve the ApplicationRef later in order to allow people\n    // to use overlay-based providers during app initialization.\n    if (!this._appRef) {\n      this._appRef = this._injector.get(ApplicationRef);\n    }\n    return new DomPortalOutlet(pane, this._componentFactoryResolver, this._appRef, this._injector, this._document);\n  }\n  static {\n    this.ɵfac = function Overlay_Factory(t) {\n      return new (t || Overlay)(i0.ɵɵinject(ScrollStrategyOptions), i0.ɵɵinject(OverlayContainer), i0.ɵɵinject(i0.ComponentFactoryResolver), i0.ɵɵinject(OverlayPositionBuilder), i0.ɵɵinject(OverlayKeyboardDispatcher), i0.ɵɵinject(i0.Injector), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(DOCUMENT), i0.ɵɵinject(i5.Directionality), i0.ɵɵinject(i6.Location), i0.ɵɵinject(OverlayOutsideClickDispatcher), i0.ɵɵinject(ANIMATION_MODULE_TYPE, 8));\n    };\n  }\n  static {\n    this.ɵprov = /* @__PURE__ */i0.ɵɵdefineInjectable({\n      token: Overlay,\n      factory: Overlay.ɵfac,\n      providedIn: 'root'\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(Overlay, [{\n    type: Injectable,\n    args: [{\n      providedIn: 'root'\n    }]\n  }], () => [{\n    type: ScrollStrategyOptions\n  }, {\n    type: OverlayContainer\n  }, {\n    type: i0.ComponentFactoryResolver\n  }, {\n    type: OverlayPositionBuilder\n  }, {\n    type: OverlayKeyboardDispatcher\n  }, {\n    type: i0.Injector\n  }, {\n    type: i0.NgZone\n  }, {\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [DOCUMENT]\n    }]\n  }, {\n    type: i5.Directionality\n  }, {\n    type: i6.Location\n  }, {\n    type: OverlayOutsideClickDispatcher\n  }, {\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [ANIMATION_MODULE_TYPE]\n    }, {\n      type: Optional\n    }]\n  }], null);\n})();\n\n/** Default set of positions for the overlay. Follows the behavior of a dropdown. */\nconst defaultPositionList = [{\n  originX: 'start',\n  originY: 'bottom',\n  overlayX: 'start',\n  overlayY: 'top'\n}, {\n  originX: 'start',\n  originY: 'top',\n  overlayX: 'start',\n  overlayY: 'bottom'\n}, {\n  originX: 'end',\n  originY: 'top',\n  overlayX: 'end',\n  overlayY: 'bottom'\n}, {\n  originX: 'end',\n  originY: 'bottom',\n  overlayX: 'end',\n  overlayY: 'top'\n}];\n/** Injection token that determines the scroll handling while the connected overlay is open. */\nconst CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY = new InjectionToken('cdk-connected-overlay-scroll-strategy', {\n  providedIn: 'root',\n  factory: () => {\n    const overlay = inject(Overlay);\n    return () => overlay.scrollStrategies.reposition();\n  }\n});\n/**\n * Directive applied to an element to make it usable as an origin for an Overlay using a\n * ConnectedPositionStrategy.\n */\nclass CdkOverlayOrigin {\n  constructor( /** Reference to the element on which the directive is applied. */\n  elementRef) {\n    this.elementRef = elementRef;\n  }\n  static {\n    this.ɵfac = function CdkOverlayOrigin_Factory(t) {\n      return new (t || CdkOverlayOrigin)(i0.ɵɵdirectiveInject(i0.ElementRef));\n    };\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkOverlayOrigin,\n      selectors: [[\"\", \"cdk-overlay-origin\", \"\"], [\"\", \"overlay-origin\", \"\"], [\"\", \"cdkOverlayOrigin\", \"\"]],\n      exportAs: [\"cdkOverlayOrigin\"],\n      standalone: true\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkOverlayOrigin, [{\n    type: Directive,\n    args: [{\n      selector: '[cdk-overlay-origin], [overlay-origin], [cdkOverlayOrigin]',\n      exportAs: 'cdkOverlayOrigin',\n      standalone: true\n    }]\n  }], () => [{\n    type: i0.ElementRef\n  }], null);\n})();\n/**\n * Directive to facilitate declarative creation of an\n * Overlay using a FlexibleConnectedPositionStrategy.\n */\nclass CdkConnectedOverlay {\n  /** The offset in pixels for the overlay connection point on the x-axis */\n  get offsetX() {\n    return this._offsetX;\n  }\n  set offsetX(offsetX) {\n    this._offsetX = offsetX;\n    if (this._position) {\n      this._updatePositionStrategy(this._position);\n    }\n  }\n  /** The offset in pixels for the overlay connection point on the y-axis */\n  get offsetY() {\n    return this._offsetY;\n  }\n  set offsetY(offsetY) {\n    this._offsetY = offsetY;\n    if (this._position) {\n      this._updatePositionStrategy(this._position);\n    }\n  }\n  /** Whether the overlay should be disposed of when the user goes backwards/forwards in history. */\n  get disposeOnNavigation() {\n    return this._disposeOnNavigation;\n  }\n  set disposeOnNavigation(value) {\n    this._disposeOnNavigation = value;\n  }\n  // TODO(jelbourn): inputs for size, scroll behavior, animation, etc.\n  constructor(_overlay, templateRef, viewContainerRef, scrollStrategyFactory, _dir) {\n    this._overlay = _overlay;\n    this._dir = _dir;\n    this._backdropSubscription = Subscription.EMPTY;\n    this._attachSubscription = Subscription.EMPTY;\n    this._detachSubscription = Subscription.EMPTY;\n    this._positionSubscription = Subscription.EMPTY;\n    this._disposeOnNavigation = false;\n    /** Margin between the overlay and the viewport edges. */\n    this.viewportMargin = 0;\n    /** Whether the overlay is open. */\n    this.open = false;\n    /** Whether the overlay can be closed by user interaction. */\n    this.disableClose = false;\n    /** Whether or not the overlay should attach a backdrop. */\n    this.hasBackdrop = false;\n    /** Whether or not the overlay should be locked when scrolling. */\n    this.lockPosition = false;\n    /** Whether the overlay's width and height can be constrained to fit within the viewport. */\n    this.flexibleDimensions = false;\n    /** Whether the overlay can grow after the initial open when flexible positioning is turned on. */\n    this.growAfterOpen = false;\n    /** Whether the overlay can be pushed on-screen if none of the provided positions fit. */\n    this.push = false;\n    /** Event emitted when the backdrop is clicked. */\n    this.backdropClick = new EventEmitter();\n    /** Event emitted when the position has changed. */\n    this.positionChange = new EventEmitter();\n    /** Event emitted when the overlay has been attached. */\n    this.attach = new EventEmitter();\n    /** Event emitted when the overlay has been detached. */\n    this.detach = new EventEmitter();\n    /** Emits when there are keyboard events that are targeted at the overlay. */\n    this.overlayKeydown = new EventEmitter();\n    /** Emits when there are mouse outside click events that are targeted at the overlay. */\n    this.overlayOutsideClick = new EventEmitter();\n    this._templatePortal = new TemplatePortal(templateRef, viewContainerRef);\n    this._scrollStrategyFactory = scrollStrategyFactory;\n    this.scrollStrategy = this._scrollStrategyFactory();\n  }\n  /** The associated overlay reference. */\n  get overlayRef() {\n    return this._overlayRef;\n  }\n  /** The element's layout direction. */\n  get dir() {\n    return this._dir ? this._dir.value : 'ltr';\n  }\n  ngOnDestroy() {\n    this._attachSubscription.unsubscribe();\n    this._detachSubscription.unsubscribe();\n    this._backdropSubscription.unsubscribe();\n    this._positionSubscription.unsubscribe();\n    if (this._overlayRef) {\n      this._overlayRef.dispose();\n    }\n  }\n  ngOnChanges(changes) {\n    if (this._position) {\n      this._updatePositionStrategy(this._position);\n      this._overlayRef.updateSize({\n        width: this.width,\n        minWidth: this.minWidth,\n        height: this.height,\n        minHeight: this.minHeight\n      });\n      if (changes['origin'] && this.open) {\n        this._position.apply();\n      }\n    }\n    if (changes['open']) {\n      this.open ? this._attachOverlay() : this._detachOverlay();\n    }\n  }\n  /** Creates an overlay */\n  _createOverlay() {\n    if (!this.positions || !this.positions.length) {\n      this.positions = defaultPositionList;\n    }\n    const overlayRef = this._overlayRef = this._overlay.create(this._buildConfig());\n    this._attachSubscription = overlayRef.attachments().subscribe(() => this.attach.emit());\n    this._detachSubscription = overlayRef.detachments().subscribe(() => this.detach.emit());\n    overlayRef.keydownEvents().subscribe(event => {\n      this.overlayKeydown.next(event);\n      if (event.keyCode === ESCAPE && !this.disableClose && !hasModifierKey(event)) {\n        event.preventDefault();\n        this._detachOverlay();\n      }\n    });\n    this._overlayRef.outsidePointerEvents().subscribe(event => {\n      this.overlayOutsideClick.next(event);\n    });\n  }\n  /** Builds the overlay config based on the directive's inputs */\n  _buildConfig() {\n    const positionStrategy = this._position = this.positionStrategy || this._createPositionStrategy();\n    const overlayConfig = new OverlayConfig({\n      direction: this._dir,\n      positionStrategy,\n      scrollStrategy: this.scrollStrategy,\n      hasBackdrop: this.hasBackdrop,\n      disposeOnNavigation: this.disposeOnNavigation\n    });\n    if (this.width || this.width === 0) {\n      overlayConfig.width = this.width;\n    }\n    if (this.height || this.height === 0) {\n      overlayConfig.height = this.height;\n    }\n    if (this.minWidth || this.minWidth === 0) {\n      overlayConfig.minWidth = this.minWidth;\n    }\n    if (this.minHeight || this.minHeight === 0) {\n      overlayConfig.minHeight = this.minHeight;\n    }\n    if (this.backdropClass) {\n      overlayConfig.backdropClass = this.backdropClass;\n    }\n    if (this.panelClass) {\n      overlayConfig.panelClass = this.panelClass;\n    }\n    return overlayConfig;\n  }\n  /** Updates the state of a position strategy, based on the values of the directive inputs. */\n  _updatePositionStrategy(positionStrategy) {\n    const positions = this.positions.map(currentPosition => ({\n      originX: currentPosition.originX,\n      originY: currentPosition.originY,\n      overlayX: currentPosition.overlayX,\n      overlayY: currentPosition.overlayY,\n      offsetX: currentPosition.offsetX || this.offsetX,\n      offsetY: currentPosition.offsetY || this.offsetY,\n      panelClass: currentPosition.panelClass || undefined\n    }));\n    return positionStrategy.setOrigin(this._getFlexibleConnectedPositionStrategyOrigin()).withPositions(positions).withFlexibleDimensions(this.flexibleDimensions).withPush(this.push).withGrowAfterOpen(this.growAfterOpen).withViewportMargin(this.viewportMargin).withLockedPosition(this.lockPosition).withTransformOriginOn(this.transformOriginSelector);\n  }\n  /** Returns the position strategy of the overlay to be set on the overlay config */\n  _createPositionStrategy() {\n    const strategy = this._overlay.position().flexibleConnectedTo(this._getFlexibleConnectedPositionStrategyOrigin());\n    this._updatePositionStrategy(strategy);\n    return strategy;\n  }\n  _getFlexibleConnectedPositionStrategyOrigin() {\n    if (this.origin instanceof CdkOverlayOrigin) {\n      return this.origin.elementRef;\n    } else {\n      return this.origin;\n    }\n  }\n  /** Attaches the overlay and subscribes to backdrop clicks if backdrop exists */\n  _attachOverlay() {\n    if (!this._overlayRef) {\n      this._createOverlay();\n    } else {\n      // Update the overlay size, in case the directive's inputs have changed\n      this._overlayRef.getConfig().hasBackdrop = this.hasBackdrop;\n    }\n    if (!this._overlayRef.hasAttached()) {\n      this._overlayRef.attach(this._templatePortal);\n    }\n    if (this.hasBackdrop) {\n      this._backdropSubscription = this._overlayRef.backdropClick().subscribe(event => {\n        this.backdropClick.emit(event);\n      });\n    } else {\n      this._backdropSubscription.unsubscribe();\n    }\n    this._positionSubscription.unsubscribe();\n    // Only subscribe to `positionChanges` if requested, because putting\n    // together all the information for it can be expensive.\n    if (this.positionChange.observers.length > 0) {\n      this._positionSubscription = this._position.positionChanges.pipe(takeWhile(() => this.positionChange.observers.length > 0)).subscribe(position => {\n        this.positionChange.emit(position);\n        if (this.positionChange.observers.length === 0) {\n          this._positionSubscription.unsubscribe();\n        }\n      });\n    }\n  }\n  /** Detaches the overlay and unsubscribes to backdrop clicks if backdrop exists */\n  _detachOverlay() {\n    if (this._overlayRef) {\n      this._overlayRef.detach();\n    }\n    this._backdropSubscription.unsubscribe();\n    this._positionSubscription.unsubscribe();\n  }\n  static {\n    this.ɵfac = function CdkConnectedOverlay_Factory(t) {\n      return new (t || CdkConnectedOverlay)(i0.ɵɵdirectiveInject(Overlay), i0.ɵɵdirectiveInject(i0.TemplateRef), i0.ɵɵdirectiveInject(i0.ViewContainerRef), i0.ɵɵdirectiveInject(CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY), i0.ɵɵdirectiveInject(i5.Directionality, 8));\n    };\n  }\n  static {\n    this.ɵdir = /* @__PURE__ */i0.ɵɵdefineDirective({\n      type: CdkConnectedOverlay,\n      selectors: [[\"\", \"cdk-connected-overlay\", \"\"], [\"\", \"connected-overlay\", \"\"], [\"\", \"cdkConnectedOverlay\", \"\"]],\n      inputs: {\n        origin: [\"cdkConnectedOverlayOrigin\", \"origin\"],\n        positions: [\"cdkConnectedOverlayPositions\", \"positions\"],\n        positionStrategy: [\"cdkConnectedOverlayPositionStrategy\", \"positionStrategy\"],\n        offsetX: [\"cdkConnectedOverlayOffsetX\", \"offsetX\"],\n        offsetY: [\"cdkConnectedOverlayOffsetY\", \"offsetY\"],\n        width: [\"cdkConnectedOverlayWidth\", \"width\"],\n        height: [\"cdkConnectedOverlayHeight\", \"height\"],\n        minWidth: [\"cdkConnectedOverlayMinWidth\", \"minWidth\"],\n        minHeight: [\"cdkConnectedOverlayMinHeight\", \"minHeight\"],\n        backdropClass: [\"cdkConnectedOverlayBackdropClass\", \"backdropClass\"],\n        panelClass: [\"cdkConnectedOverlayPanelClass\", \"panelClass\"],\n        viewportMargin: [\"cdkConnectedOverlayViewportMargin\", \"viewportMargin\"],\n        scrollStrategy: [\"cdkConnectedOverlayScrollStrategy\", \"scrollStrategy\"],\n        open: [\"cdkConnectedOverlayOpen\", \"open\"],\n        disableClose: [\"cdkConnectedOverlayDisableClose\", \"disableClose\"],\n        transformOriginSelector: [\"cdkConnectedOverlayTransformOriginOn\", \"transformOriginSelector\"],\n        hasBackdrop: [\"cdkConnectedOverlayHasBackdrop\", \"hasBackdrop\", booleanAttribute],\n        lockPosition: [\"cdkConnectedOverlayLockPosition\", \"lockPosition\", booleanAttribute],\n        flexibleDimensions: [\"cdkConnectedOverlayFlexibleDimensions\", \"flexibleDimensions\", booleanAttribute],\n        growAfterOpen: [\"cdkConnectedOverlayGrowAfterOpen\", \"growAfterOpen\", booleanAttribute],\n        push: [\"cdkConnectedOverlayPush\", \"push\", booleanAttribute],\n        disposeOnNavigation: [\"cdkConnectedOverlayDisposeOnNavigation\", \"disposeOnNavigation\", booleanAttribute]\n      },\n      outputs: {\n        backdropClick: \"backdropClick\",\n        positionChange: \"positionChange\",\n        attach: \"attach\",\n        detach: \"detach\",\n        overlayKeydown: \"overlayKeydown\",\n        overlayOutsideClick: \"overlayOutsideClick\"\n      },\n      exportAs: [\"cdkConnectedOverlay\"],\n      standalone: true,\n      features: [i0.ɵɵInputTransformsFeature, i0.ɵɵNgOnChangesFeature]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(CdkConnectedOverlay, [{\n    type: Directive,\n    args: [{\n      selector: '[cdk-connected-overlay], [connected-overlay], [cdkConnectedOverlay]',\n      exportAs: 'cdkConnectedOverlay',\n      standalone: true\n    }]\n  }], () => [{\n    type: Overlay\n  }, {\n    type: i0.TemplateRef\n  }, {\n    type: i0.ViewContainerRef\n  }, {\n    type: undefined,\n    decorators: [{\n      type: Inject,\n      args: [CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY]\n    }]\n  }, {\n    type: i5.Directionality,\n    decorators: [{\n      type: Optional\n    }]\n  }], {\n    origin: [{\n      type: Input,\n      args: ['cdkConnectedOverlayOrigin']\n    }],\n    positions: [{\n      type: Input,\n      args: ['cdkConnectedOverlayPositions']\n    }],\n    positionStrategy: [{\n      type: Input,\n      args: ['cdkConnectedOverlayPositionStrategy']\n    }],\n    offsetX: [{\n      type: Input,\n      args: ['cdkConnectedOverlayOffsetX']\n    }],\n    offsetY: [{\n      type: Input,\n      args: ['cdkConnectedOverlayOffsetY']\n    }],\n    width: [{\n      type: Input,\n      args: ['cdkConnectedOverlayWidth']\n    }],\n    height: [{\n      type: Input,\n      args: ['cdkConnectedOverlayHeight']\n    }],\n    minWidth: [{\n      type: Input,\n      args: ['cdkConnectedOverlayMinWidth']\n    }],\n    minHeight: [{\n      type: Input,\n      args: ['cdkConnectedOverlayMinHeight']\n    }],\n    backdropClass: [{\n      type: Input,\n      args: ['cdkConnectedOverlayBackdropClass']\n    }],\n    panelClass: [{\n      type: Input,\n      args: ['cdkConnectedOverlayPanelClass']\n    }],\n    viewportMargin: [{\n      type: Input,\n      args: ['cdkConnectedOverlayViewportMargin']\n    }],\n    scrollStrategy: [{\n      type: Input,\n      args: ['cdkConnectedOverlayScrollStrategy']\n    }],\n    open: [{\n      type: Input,\n      args: ['cdkConnectedOverlayOpen']\n    }],\n    disableClose: [{\n      type: Input,\n      args: ['cdkConnectedOverlayDisableClose']\n    }],\n    transformOriginSelector: [{\n      type: Input,\n      args: ['cdkConnectedOverlayTransformOriginOn']\n    }],\n    hasBackdrop: [{\n      type: Input,\n      args: [{\n        alias: 'cdkConnectedOverlayHasBackdrop',\n        transform: booleanAttribute\n      }]\n    }],\n    lockPosition: [{\n      type: Input,\n      args: [{\n        alias: 'cdkConnectedOverlayLockPosition',\n        transform: booleanAttribute\n      }]\n    }],\n    flexibleDimensions: [{\n      type: Input,\n      args: [{\n        alias: 'cdkConnectedOverlayFlexibleDimensions',\n        transform: booleanAttribute\n      }]\n    }],\n    growAfterOpen: [{\n      type: Input,\n      args: [{\n        alias: 'cdkConnectedOverlayGrowAfterOpen',\n        transform: booleanAttribute\n      }]\n    }],\n    push: [{\n      type: Input,\n      args: [{\n        alias: 'cdkConnectedOverlayPush',\n        transform: booleanAttribute\n      }]\n    }],\n    disposeOnNavigation: [{\n      type: Input,\n      args: [{\n        alias: 'cdkConnectedOverlayDisposeOnNavigation',\n        transform: booleanAttribute\n      }]\n    }],\n    backdropClick: [{\n      type: Output\n    }],\n    positionChange: [{\n      type: Output\n    }],\n    attach: [{\n      type: Output\n    }],\n    detach: [{\n      type: Output\n    }],\n    overlayKeydown: [{\n      type: Output\n    }],\n    overlayOutsideClick: [{\n      type: Output\n    }]\n  });\n})();\n/** @docs-private */\nfunction CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER_FACTORY(overlay) {\n  return () => overlay.scrollStrategies.reposition();\n}\n/** @docs-private */\nconst CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER = {\n  provide: CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY,\n  deps: [Overlay],\n  useFactory: CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER_FACTORY\n};\nclass OverlayModule {\n  static {\n    this.ɵfac = function OverlayModule_Factory(t) {\n      return new (t || OverlayModule)();\n    };\n  }\n  static {\n    this.ɵmod = /* @__PURE__ */i0.ɵɵdefineNgModule({\n      type: OverlayModule,\n      imports: [BidiModule, PortalModule, ScrollingModule, CdkConnectedOverlay, CdkOverlayOrigin],\n      exports: [CdkConnectedOverlay, CdkOverlayOrigin, ScrollingModule]\n    });\n  }\n  static {\n    this.ɵinj = /* @__PURE__ */i0.ɵɵdefineInjector({\n      providers: [Overlay, CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER],\n      imports: [BidiModule, PortalModule, ScrollingModule, ScrollingModule]\n    });\n  }\n}\n(() => {\n  (typeof ngDevMode === \"undefined\" || ngDevMode) && i0.ɵsetClassMetadata(OverlayModule, [{\n    type: NgModule,\n    args: [{\n      imports: [BidiModule, PortalModule, ScrollingModule, CdkConnectedOverlay, CdkOverlayOrigin],\n      exports: [CdkConnectedOverlay, CdkOverlayOrigin, ScrollingModule],\n      providers: [Overlay, CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER]\n    }]\n  }], null, null);\n})();\n\n/**\n * Alternative to OverlayContainer that supports correct displaying of overlay elements in\n * Fullscreen mode\n * https://developer.mozilla.org/en-US/docs/Web/API/Element/requestFullScreen\n *\n * Should be provided in the root component.\n */\nclass FullscreenOverlayContainer extends OverlayContainer {\n  constructor(_document, platform) {\n    super(_document, platform);\n  }\n  ngOnDestroy() {\n    super.ngOnDestroy();\n    if (this._fullScreenEventName && this._fullScreenListener) {\n      this._document.removeEventListener(this._fullScreenEventName, this._fullScreenListener);\n    }\n  }\n  _createContainer() {\n    super._createContainer();\n    this._adjustParentForFullscreenChange();\n    this._addFullscreenChangeListener(() => this._adjustParentForFullscreenChange());\n  }\n  _adjustParentForFullscreenChange() {\n    if (!this._containerElement) {\n      return;\n    }\n    const fullscreenElement = this.getFullscreenElement();\n    const parent = fullscreenElement || this._document.body;\n    parent.appendChild(this._containerElement);\n  }\n  _addFullscreenChangeListener(fn) {\n    const eventName = this._getEventName();\n    if (eventName) {\n      if (this._fullScreenListener) {\n        this._document.removeEventListener(eventName, this._fullScreenListener);\n      }\n      this._document.addEventListener(eventName, fn);\n      this._fullScreenListener = fn;\n    }\n  }\n  _getEventName() {\n    if (!this._fullScreenEventName) {\n      const _document = this._document;\n      if (_document.fullscreenEnabled) {\n        this._fullScreenEventName = 'fullscreenchange';\n      } else if (_document.webkitFullscreenEnabled) {\n        this._fullScreenEventName = 'webkitfullscreenchange';\n      } else if (_document.mozFullScreenEnabled) {\n        this._fullScreenEventName = 'mozfullscreenchange';\n      } else if (_document.msFullscreenEnabled) {\n        this._fullScreenEventName = 'MSFullscreenChange';\n      }\n    }\n    return this._fullScreenEventName;\n  }\n  /**\n   * When the page is put into fullscreen mode, a specific element is specified.\n   * Only 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