@rx-angular/template/fesm2022/template-virtual-view.mjs.map

**Fully** Reactive Component Template Rendering in Angular. @rx-angular/template aims to be a reflection of Angular's built in renderings just reactive.

{"version":3,"file":"template-virtual-view.mjs","sources":["../../../../libs/template/virtual-view/src/lib/virtual-view.config.ts","../../../../libs/template/virtual-view/src/lib/model.ts","../../../../libs/template/virtual-view/src/lib/virtual-view-cache.ts","../../../../libs/template/virtual-view/src/lib/virtual-view.directive.ts","../../../../libs/template/virtual-view/src/lib/virtual-view-content.directive.ts","../../../../libs/template/virtual-view/src/lib/resize-observer.ts","../../../../libs/template/virtual-view/src/lib/virtual-view-observer.directive.ts","../../../../libs/template/virtual-view/src/lib/virtual-view-placeholder.directive.ts","../../../../libs/template/virtual-view/src/template-virtual-view.ts"],"sourcesContent":["import { InjectionToken, Provider } from '@angular/core';\nimport { RxStrategyNames } from '@rx-angular/cdk/render-strategies';\n\nexport const VIRTUAL_VIEW_CONFIG_TOKEN =\n  new InjectionToken<RxVirtualViewConfig>('VIRTUAL_VIEW_CONFIG_TOKEN', {\n    providedIn: 'root',\n    factory: () => VIRTUAL_VIEW_CONFIG_DEFAULT,\n  });\n\nexport interface RxVirtualViewConfig {\n  keepLastKnownSize: boolean;\n  useContentVisibility: boolean;\n  useContainment: boolean;\n  placeholderStrategy: RxStrategyNames<string>;\n  contentStrategy: RxStrategyNames<string>;\n  cacheEnabled: boolean;\n  startWithPlaceholderAsap: boolean;\n  cache: {\n    /**\n     * The maximum number of contents that can be stored in the cache.\n     * Defaults to 20.\n     */\n    contentCacheSize: number;\n\n    /**\n     * The maximum number of placeholders that can be stored in the cache.\n     * Defaults to 20.\n     */\n    placeholderCacheSize: number;\n  };\n}\n\nexport const VIRTUAL_VIEW_CONFIG_DEFAULT: RxVirtualViewConfig = {\n  keepLastKnownSize: false,\n  useContentVisibility: false,\n  useContainment: true,\n  placeholderStrategy: 'low',\n  contentStrategy: 'normal',\n  startWithPlaceholderAsap: false,\n  cacheEnabled: true,\n  cache: {\n    contentCacheSize: 20,\n    placeholderCacheSize: 20,\n  },\n};\n\n/**\n * Provides a configuration object for the `VirtualView` service.\n *\n * Can be used to customize the behavior of the `VirtualView` service.\n *\n * Default configuration:\n * - contentCacheSize: 20\n * - placeholderCacheSize: 20\n *\n * Example usage:\n *\n * ```ts\n * import { provideVirtualViewConfig } from '@rx-angular/template/virtual-view';\n *\n * const appConfig: ApplicationConfig = {\n *   providers: [\n *     provideVirtualViewConfig({\n *       contentCacheSize: 50,\n *       placeholderCacheSize: 50,\n *     }),\n *   ],\n * };\n * ```\n *\n * @developerPreview\n *\n * @param config - The configuration object.\n * @returns An object that can be provided to the `VirtualView` service.\n */\nexport function provideVirtualViewConfig(\n  config: Partial<\n    RxVirtualViewConfig & { cache?: Partial<RxVirtualViewConfig['cache']> }\n  >,\n): Provider {\n  return {\n    provide: VIRTUAL_VIEW_CONFIG_TOKEN,\n    useValue: {\n      ...VIRTUAL_VIEW_CONFIG_DEFAULT,\n      ...config,\n      cache: { ...VIRTUAL_VIEW_CONFIG_DEFAULT.cache, ...(config?.cache ?? {}) },\n    },\n  } satisfies Provider;\n}\n","import { TemplateRef, ViewContainerRef } from '@angular/core';\nimport { Observable } from 'rxjs';\n\n/**\n * @internal\n */\nexport interface _RxVirtualViewContent {\n  viewContainerRef: ViewContainerRef;\n  templateRef: TemplateRef<unknown>;\n}\n\n/**\n * @internal\n */\nexport interface _RxVirtualViewPlaceholder {\n  templateRef: TemplateRef<unknown>;\n}\n\n/**\n * @internal\n */\nexport abstract class _RxVirtualViewObserver {\n  abstract observeElementVisibility(\n    virtualView: HTMLElement,\n  ): Observable<boolean>;\n  abstract observeElementSize(\n    element: Element,\n    options?: ResizeObserverOptions,\n  ): Observable<ResizeObserverEntry>;\n}\n\n/**\n * @internal\n */\nexport abstract class _RxVirtualView {\n  abstract registerContent(content: _RxVirtualViewContent): void;\n  abstract registerPlaceholder(placeholder: _RxVirtualViewPlaceholder): void;\n}\n","import { inject, Injectable, OnDestroy, ViewRef } from '@angular/core';\nimport { VIRTUAL_VIEW_CONFIG_TOKEN } from './virtual-view.config';\n\n/**\n * A service that caches templates and placeholders to optimize view rendering.\n * It makes sure that all cached resources are cleared when the service is destroyed.\n *\n * @developerPreview\n */\n@Injectable()\nexport class VirtualViewCache implements OnDestroy {\n  #config = inject(VIRTUAL_VIEW_CONFIG_TOKEN);\n\n  // Maximum number of content that can be stored in the cache.\n  #contentCacheSize = this.#config.cache.contentCacheSize;\n\n  // Cache for storing content views, identified by a unique key, which is the directive instance.\n  #contentCache = new Map<unknown, ViewRef>();\n\n  // Maximum number of placeholders that can be stored in the cache.\n  #placeholderCacheSize = this.#config.cache.placeholderCacheSize;\n\n  // Cache for storing placeholder views, identified by a unique key.\n  #placeholderCache = new Map<unknown, ViewRef>();\n\n  /**\n   * Stores a placeholder view in the cache. When the cache reaches its limit,\n   * the oldest entry is removed.\n   *\n   * @param key - The key used to identify the placeholder in the cache.\n   * @param view - The ViewRef of the placeholder to cache.\n   */\n  storePlaceholder(key: unknown, view: ViewRef) {\n    if (this.#placeholderCacheSize <= 0) {\n      view.destroy();\n      return;\n    }\n    if (this.#placeholderCache.size >= this.#placeholderCacheSize) {\n      this.#removeOldestEntry(this.#placeholderCache);\n    }\n    this.#placeholderCache.set(key, view);\n  }\n\n  /**\n   * Retrieves a cached placeholder view using the specified key.\n   *\n   * @param key - The key of the placeholder to retrieve.\n   * @returns The ViewRef of the cached placeholder, or undefined if not found.\n   */\n  getPlaceholder(key: unknown) {\n    const view = this.#placeholderCache.get(key);\n    this.#placeholderCache.delete(key);\n    return view;\n  }\n\n  /**\n   * Stores a content view in the cache. When the cache reaches its limit,\n   * the oldest entry is removed.\n   *\n   * @param key - The key used to identify the content in the cache.\n   * @param view - The ViewRef of the content to cache.\n   */\n  storeContent(key: unknown, view: ViewRef) {\n    if (this.#contentCacheSize <= 0) {\n      view.destroy();\n      return;\n    }\n    if (this.#contentCache.size >= this.#contentCacheSize) {\n      this.#removeOldestEntry(this.#contentCache);\n    }\n    this.#contentCache.set(key, view);\n  }\n\n  /**\n   * Retrieves a cached content view using the specified key.\n   *\n   * @param key - The key of the content to retrieve.\n   * @returns The ViewRef of the cached content, or undefined if not found.\n   */\n  getContent(key: unknown) {\n    const view = this.#contentCache.get(key);\n    this.#contentCache.delete(key);\n    return view;\n  }\n\n  /**\n   * Clears both content and placeholder caches for a given key.\n   *\n   * @param key - The key of the content and placeholder to remove.\n   */\n  clear(key: unknown) {\n    this.#contentCache.get(key)?.destroy();\n    this.#contentCache.delete(key);\n    this.#placeholderCache.get(key)?.destroy();\n    this.#placeholderCache.delete(key);\n  }\n\n  /**\n   * Clears all cached resources when the service is destroyed.\n   */\n  ngOnDestroy() {\n    this.#contentCache.forEach((view) => view.destroy());\n    this.#placeholderCache.forEach((view) => view.destroy());\n    this.#contentCache.clear();\n    this.#placeholderCache.clear();\n  }\n\n  #removeOldestEntry(cache: Map<unknown, ViewRef>) {\n    const oldestValue = cache.entries().next().value;\n    if (oldestValue !== undefined) {\n      const [key, view] = oldestValue;\n      view?.destroy();\n      cache.delete(key);\n    }\n  }\n}\n","import {\n  AfterContentInit,\n  booleanAttribute,\n  computed,\n  DestroyRef,\n  Directive,\n  ElementRef,\n  EmbeddedViewRef,\n  inject,\n  input,\n  OnDestroy,\n  signal,\n} from '@angular/core';\nimport { takeUntilDestroyed } from '@angular/core/rxjs-interop';\nimport {\n  RxStrategyNames,\n  RxStrategyProvider,\n} from '@rx-angular/cdk/render-strategies';\nimport { NEVER, Observable, ReplaySubject } from 'rxjs';\nimport {\n  distinctUntilChanged,\n  finalize,\n  map,\n  switchMap,\n  tap,\n} from 'rxjs/operators';\nimport {\n  _RxVirtualView,\n  _RxVirtualViewContent,\n  _RxVirtualViewObserver,\n  _RxVirtualViewPlaceholder,\n} from './model';\nimport { VIRTUAL_VIEW_CONFIG_TOKEN } from './virtual-view.config';\nimport { VirtualViewCache } from './virtual-view-cache';\n\n/**\n * The RxVirtualView directive is a directive that allows you to create virtual views.\n *\n * It can be used on an element/component to create a virtual view.\n *\n * It works by using 3 directives:\n * - `rxVirtualViewContent`: The content to render when the virtual view is visible.\n * - `rxVirtualViewPlaceholder`: The placeholder to render when the virtual view is not visible.\n * - `rxVirtualViewObserver`: The directive that observes the virtual view and emits a boolean value indicating whether the virtual view is visible.\n *\n * The `rxVirtualViewObserver` directive is mandatory for the `rxVirtualView` directive to work.\n * And it needs to be a sibling of the `rxVirtualView` directive.\n *\n * @example\n * ```html\n * <div rxVirtualViewObserver>\n *   <div rxVirtualView>\n *     <div *rxVirtualViewContent>Virtual View 1</div>\n *     <div *rxVirtualViewPlaceholder>Loading...</div>\n *   </div>\n * </div>\n * ```\n *\n * @developerPreview\n */\n@Directive({\n  selector: '[rxVirtualView]',\n  host: {\n    '[style.--rx-vw-h]': 'height()',\n    '[style.--rx-vw-w]': 'width()',\n    '[style.min-height]': 'minHeight()',\n    '[style.min-width]': 'minWidth()',\n    '[style.contain]': 'containment()',\n    '[style.contain-intrinsic-width]': 'intrinsicWidth()',\n    '[style.contain-intrinsic-height]': 'intrinsicHeight()',\n    '[style.content-visibility]': 'useContentVisibility() ? \"auto\" : null',\n  },\n  providers: [{ provide: _RxVirtualView, useExisting: RxVirtualView }],\n})\nexport class RxVirtualView\n  implements AfterContentInit, _RxVirtualView, OnDestroy\n{\n  readonly #observer = inject(_RxVirtualViewObserver, { optional: true });\n  readonly #elementRef = inject<ElementRef<HTMLElement>>(ElementRef);\n  readonly #strategyProvider = inject<RxStrategyProvider>(RxStrategyProvider);\n  readonly #viewCache = inject(VirtualViewCache, { optional: true });\n  readonly #destroyRef = inject(DestroyRef);\n  readonly #config = inject(VIRTUAL_VIEW_CONFIG_TOKEN);\n\n  #content: _RxVirtualViewContent | null = null;\n  #placeholder: _RxVirtualViewPlaceholder | null = null;\n\n  /**\n   * Useful when we want to cache the templates and placeholders to optimize view rendering.\n   *\n   * Enabled by default.\n   */\n  readonly cacheEnabled = input(this.#config.cacheEnabled, {\n    transform: booleanAttribute,\n  });\n\n  /**\n   * Whether to start with the placeholder asap or not.\n   *\n   * If `true`, the placeholder will be rendered immediately, without waiting for the content to be visible.\n   * This is useful when you want to render the placeholder immediately, but you don't want to wait for the content to be visible.\n   *\n   * This is to counter concurrent rendering, and to avoid flickering.\n   */\n  readonly startWithPlaceholderAsap = input(\n    this.#config.startWithPlaceholderAsap,\n    {\n      transform: booleanAttribute,\n    },\n  );\n\n  /**\n   * This will keep the last known size of the host element while the content is visible.\n   */\n  readonly keepLastKnownSize = input(this.#config.keepLastKnownSize, {\n    transform: booleanAttribute,\n  });\n\n  /**\n   * Whether to use content visibility or not.\n   *\n   * It will add the `content-visibility` CSS class to the host element, together with\n   * `contain-intrinsic-width` and `contain-intrinsic-height` CSS properties.\n   */\n  readonly useContentVisibility = input(this.#config.useContentVisibility, {\n    transform: booleanAttribute,\n  });\n\n  /**\n   * Whether to use containment or not.\n   *\n   * It will add `contain` css property with:\n   * - `size layout paint`: if `useContentVisibility` is `true` && placeholder is visible\n   * - `content`: if `useContentVisibility` is `false` || content is visible\n   */\n  readonly useContainment = input(this.#config.useContainment, {\n    transform: booleanAttribute,\n  });\n\n  /**\n   * The strategy to use for rendering the placeholder.\n   */\n  readonly placeholderStrategy = input<RxStrategyNames<string>>(\n    this.#config.placeholderStrategy,\n  );\n\n  /**\n   * The strategy to use for rendering the content.\n   */\n  readonly contentStrategy = input<RxStrategyNames<string>>(\n    this.#config.contentStrategy,\n  );\n\n  /**\n   * A function extracting width & height from a ResizeObserverEntry\n   */\n  readonly extractSize =\n    input<(entry: ResizeObserverEntry) => { width: number; height: number }>(\n      defaultExtractSize,\n    );\n\n  /**\n   * ResizeObserverOptions\n   */\n  readonly resizeObserverOptions = input<ResizeObserverOptions>();\n\n  readonly #placeholderVisible = signal(false);\n\n  #contentIsShown = false;\n\n  readonly #visible$ = new ReplaySubject<boolean>(1);\n\n  readonly size = signal({ width: 0, height: 0 });\n\n  readonly width = computed(() =>\n    this.size().width ? `${this.size().width}px` : 'auto',\n  );\n\n  readonly height = computed(() =>\n    this.size().height ? `${this.size().height}px` : 'auto',\n  );\n\n  readonly containment = computed(() => {\n    if (!this.useContainment()) {\n      return null;\n    }\n    return this.useContentVisibility() && this.#placeholderVisible()\n      ? 'size layout paint'\n      : 'content';\n  });\n\n  readonly intrinsicWidth = computed(() => {\n    if (!this.useContentVisibility()) {\n      return null;\n    }\n    return this.width() === 'auto' ? 'auto' : `auto ${this.width()}`;\n  });\n  readonly intrinsicHeight = computed(() => {\n    if (!this.useContentVisibility()) {\n      return null;\n    }\n    return this.height() === 'auto' ? 'auto' : `auto ${this.height()}`;\n  });\n\n  readonly minHeight = computed(() => {\n    return this.keepLastKnownSize() && this.#placeholderVisible()\n      ? this.height()\n      : null;\n  });\n  readonly minWidth = computed(() => {\n    return this.keepLastKnownSize() && this.#placeholderVisible()\n      ? this.width()\n      : null;\n  });\n\n  constructor() {\n    if (!this.#observer) {\n      throw new Error(\n        'RxVirtualView expects you to provide a RxVirtualViewObserver',\n      );\n    }\n  }\n\n  ngAfterContentInit() {\n    if (!this.#content) {\n      throw new Error(\n        'RxVirtualView expects you to provide a RxVirtualViewContent',\n      );\n    }\n    if (this.startWithPlaceholderAsap()) {\n      this.renderPlaceholder();\n    }\n\n    this.#observer\n      ?.observeElementVisibility(this.#elementRef.nativeElement)\n      .pipe(takeUntilDestroyed(this.#destroyRef))\n      .subscribe((visible) => this.#visible$.next(visible));\n\n    this.#visible$\n      .pipe(\n        distinctUntilChanged(),\n        switchMap((visible) => {\n          if (visible) {\n            return this.#contentIsShown\n              ? NEVER\n              : this.showContent$().pipe(\n                  switchMap((view) => {\n                    const resize$ = this.#observer!.observeElementSize(\n                      this.#elementRef.nativeElement,\n                      this.resizeObserverOptions(),\n                    );\n                    view.detectChanges();\n                    return resize$;\n                  }),\n                  map(this.extractSize()),\n                  tap(({ width, height }) => this.size.set({ width, height })),\n                );\n          }\n          return this.#placeholderVisible() ? NEVER : this.showPlaceholder$();\n        }),\n        finalize(() => {\n          this.#viewCache!.clear(this);\n        }),\n        takeUntilDestroyed(this.#destroyRef),\n      )\n      .subscribe();\n  }\n\n  ngOnDestroy() {\n    this.#content = null;\n    this.#placeholder = null;\n  }\n\n  registerContent(content: _RxVirtualViewContent) {\n    this.#content = content;\n  }\n\n  registerPlaceholder(placeholder: _RxVirtualViewPlaceholder) {\n    this.#placeholder = placeholder;\n  }\n\n  /**\n   * Shows the content using the configured rendering strategy (by default: normal).\n   * @private\n   */\n  private showContent$(): Observable<EmbeddedViewRef<unknown>> {\n    return this.#strategyProvider.schedule(\n      () => {\n        this.#contentIsShown = true;\n        this.#placeholderVisible.set(false);\n        const placeHolder = this.#content!.viewContainerRef.detach();\n        if (this.cacheEnabled() && placeHolder) {\n          this.#viewCache!.storePlaceholder(this, placeHolder);\n        } else if (!this.cacheEnabled() && placeHolder) {\n          placeHolder.destroy();\n        }\n        const tmpl =\n          (this.#viewCache!.getContent(this) as EmbeddedViewRef<unknown>) ??\n          this.#content!.templateRef.createEmbeddedView({});\n        this.#content!.viewContainerRef.insert(tmpl);\n        placeHolder?.detectChanges();\n\n        return tmpl;\n      },\n      { scope: this, strategy: this.contentStrategy() },\n    );\n  }\n\n  /**\n   * Shows the placeholder using the configured rendering strategy (by default: low).\n   * @private\n   */\n  private showPlaceholder$() {\n    return this.#strategyProvider.schedule(() => this.renderPlaceholder(), {\n      scope: this,\n      strategy: this.placeholderStrategy(),\n    });\n  }\n\n  /**\n   * Renders a placeholder within the view container, and hides the content.\n   *\n   * If we already have a content and cache enabled, we store the content in\n   * the cache, so we can reuse it later.\n   *\n   * When we want to render the placeholder, we try to get it from the cache,\n   * and if it is not available, we create a new one.\n   *\n   * Then insert the placeholder into the view container and trigger a CD.\n   */\n  private renderPlaceholder() {\n    this.#placeholderVisible.set(true);\n    this.#contentIsShown = false;\n\n    const content = this.#content!.viewContainerRef.detach();\n\n    if (content) {\n      if (this.cacheEnabled()) {\n        this.#viewCache!.storeContent(this, content);\n      } else {\n        content.destroy();\n      }\n\n      content?.detectChanges();\n    }\n\n    if (this.#placeholder) {\n      const placeholderRef =\n        this.#viewCache!.getPlaceholder(this) ??\n        this.#placeholder.templateRef.createEmbeddedView({});\n\n      this.#content!.viewContainerRef.insert(placeholderRef);\n      placeholderRef.detectChanges();\n    }\n  }\n}\n\nconst defaultExtractSize = (entry: ResizeObserverEntry) => ({\n  width: entry.borderBoxSize[0].inlineSize,\n  height: entry.borderBoxSize[0].blockSize,\n});\n","import {\n  Directive,\n  inject,\n  TemplateRef,\n  ViewContainerRef,\n} from '@angular/core';\nimport { _RxVirtualViewContent } from './model';\nimport { RxVirtualView } from './virtual-view.directive';\n\n/**\n * The RxVirtualViewTemplate directive is a directive that allows you to create a content template for the virtual view.\n *\n * It can be used on an element/component to create a content template for the virtual view.\n *\n * It needs to be a sibling of the `rxVirtualView` directive.\n *\n * @example\n * ```html\n * <div rxVirtualViewObserver>\n *   <div rxVirtualView>\n *     <div *rxVirtualViewContent>Virtual View 1</div>\n *     <div *rxVirtualViewPlaceholder>Loading...</div>\n *   </div>\n * </div>\n * ```\n *\n * @developerPreview\n */\n@Directive({ selector: '[rxVirtualViewContent]', standalone: true })\nexport class RxVirtualViewContent implements _RxVirtualViewContent {\n  #virtualView = inject(RxVirtualView);\n  viewContainerRef = inject(ViewContainerRef);\n  constructor(public templateRef: TemplateRef<unknown>) {\n    this.#virtualView.registerContent(this);\n  }\n}\n","import { DestroyRef, inject, Injectable } from '@angular/core';\nimport { Observable, ReplaySubject, Subject } from 'rxjs';\nimport { distinctUntilChanged, finalize } from 'rxjs/operators';\n\n/**\n * A service that observes the resize of the elements.\n *\n * @developerPreview\n */\n@Injectable()\nexport class RxaResizeObserver {\n  #destroyRef = inject(DestroyRef);\n  #resizeObserver = new ResizeObserver((entries) => {\n    entries.forEach((entry) => {\n      if (this.#elements.has(entry.target))\n        this.#elements.get(entry.target)!.next(entry);\n    });\n  });\n\n  /** @internal */\n  #elements = new Map<Element, Subject<ResizeObserverEntry>>();\n\n  constructor() {\n    this.#destroyRef.onDestroy(() => {\n      this.#elements.clear();\n      this.#resizeObserver.disconnect();\n    });\n  }\n\n  observeElement(\n    element: Element,\n    options?: ResizeObserverOptions,\n  ): Observable<ResizeObserverEntry> {\n    const resizeEvent$ = new ReplaySubject<ResizeObserverEntry>(1);\n    this.#elements.set(element, resizeEvent$);\n    this.#resizeObserver.observe(element, options);\n\n    return resizeEvent$.pipe(\n      distinctUntilChanged(),\n      finalize(() => {\n        this.#resizeObserver.unobserve(element);\n        this.#elements.delete(element);\n      }),\n    );\n  }\n}\n","import {\n  computed,\n  Directive,\n  ElementRef,\n  inject,\n  input,\n  OnDestroy,\n  OnInit,\n} from '@angular/core';\nimport {\n  BehaviorSubject,\n  combineLatest,\n  Observable,\n  ReplaySubject,\n  Subject,\n} from 'rxjs';\nimport { distinctUntilChanged, finalize, map } from 'rxjs/operators';\nimport { _RxVirtualViewObserver } from './model';\nimport { RxaResizeObserver } from './resize-observer';\nimport { VirtualViewCache } from './virtual-view-cache';\n\n/**\n * The RxVirtualViewObserver directive observes the virtual view and emits a boolean value indicating whether the virtual view is visible.\n * This is the container for the RxVirtualView directives.\n *\n * This is a mandatory directive for the RxVirtualView directives to work.\n *\n * @example\n * ```html\n * <div rxVirtualViewObserver>\n *   <div rxVirtualView>\n *     <div *rxVirtualViewContent>Virtual View 1</div>\n *     <div *rxVirtualViewPlaceholder>Loading...</div>\n *   </div>\n * </div>\n * ```\n *\n * @developerPreview\n */\n@Directive({\n  selector: '[rxVirtualViewObserver]',\n  standalone: true,\n  providers: [\n    VirtualViewCache,\n    RxaResizeObserver,\n    { provide: _RxVirtualViewObserver, useExisting: RxVirtualViewObserver },\n  ],\n})\nexport class RxVirtualViewObserver\n  extends _RxVirtualViewObserver\n  implements OnInit, OnDestroy\n{\n  #elementRef = inject<ElementRef<HTMLElement>>(ElementRef);\n\n  #observer: IntersectionObserver | null = null;\n\n  #resizeObserver = inject(RxaResizeObserver, { self: true });\n\n  /**\n   * The root element to observe.\n   *\n   * If not provided, the root element is the element that the directive is attached to.\n   */\n  root = input<ElementRef | HTMLElement | null>();\n\n  /**\n   * The root margin to observe.\n   *\n   * This is useful when you want to observe the virtual view in a specific area of the root element.\n   */\n  rootMargin = input('');\n\n  /**\n   * The threshold to observe.\n   *\n   * If you want to observe the virtual view when it is partially visible, you can set the threshold to a number between 0 and 1.\n   *\n   * For example, if you set the threshold to 0.5, the virtual view will be observed when it is half visible.\n   */\n  threshold = input<number | number[]>(0);\n\n  #rootElement = computed(() => {\n    const root = this.root();\n    if (root) {\n      if (root instanceof ElementRef) {\n        return root.nativeElement;\n      }\n      return root;\n    } else if (root === null) {\n      return null;\n    }\n    return this.#elementRef.nativeElement;\n  });\n\n  #elements = new Map<Element, Subject<boolean>>();\n\n  #forcedHidden$ = new BehaviorSubject(false);\n\n  ngOnInit(): void {\n    this.#observer = new IntersectionObserver(\n      (entries) => {\n        entries.forEach((entry) => {\n          if (this.#elements.has(entry.target))\n            this.#elements.get(entry.target)?.next(entry.isIntersecting);\n        });\n      },\n      {\n        root: this.#rootElement(),\n        rootMargin: this.rootMargin(),\n        threshold: this.threshold(),\n      },\n    );\n  }\n\n  ngOnDestroy() {\n    this.#elements.clear();\n    this.#observer?.disconnect();\n    this.#observer = null;\n  }\n\n  /**\n   * Hide all the virtual views.\n   *\n   * This is useful when you want to hide all the virtual views when the user cannot see them.\n   *\n   * For example, when the user opens a modal, you can hide all the virtual views to improve performance.\n   *\n   * **IMPORTANT:**\n   *\n   * Don't forget to call `showAllVisible()` when you want to show the virtual views again.\n   */\n  hideAll(): void {\n    this.#forcedHidden$.next(true);\n  }\n\n  /**\n   * Show all the virtual views that are currently visible.\n   *\n   * This needs to be called if `hideAll()` was called before.\n   */\n  showAllVisible(): void {\n    this.#forcedHidden$.next(false);\n  }\n\n  observeElementVisibility(virtualView: HTMLElement) {\n    const isVisible$ = new ReplaySubject<boolean>(1);\n\n    // Store the view and the visibility state in the map.\n    // This allows us to retrieve the visibility state later.\n    this.#elements.set(virtualView, isVisible$);\n\n    // Start observing the virtual view immediately.\n    this.#observer?.observe(virtualView);\n\n    return combineLatest([isVisible$, this.#forcedHidden$]).pipe(\n      map(([isVisible, forcedHidden]) => (forcedHidden ? false : isVisible)),\n      distinctUntilChanged(),\n      finalize(() => {\n        this.#observer?.unobserve(virtualView);\n        this.#elements.delete(virtualView);\n      }),\n    );\n  }\n\n  observeElementSize(\n    element: Element,\n    options?: ResizeObserverOptions,\n  ): Observable<ResizeObserverEntry> {\n    return this.#resizeObserver.observeElement(element, options);\n  }\n}\n","import { Directive, inject, TemplateRef } from '@angular/core';\nimport { _RxVirtualView, _RxVirtualViewPlaceholder } from './model';\n\n/**\n * The RxVirtualViewPlaceholder directive is a directive that allows you to create a placeholder for the virtual view.\n *\n * It can be used on an element/component to create a placeholder for the virtual view.\n *\n * It needs to be a sibling of the `rxVirtualView` directive.\n *\n * @example\n * ```html\n * <div rxVirtualViewObserver>\n *   <div rxVirtualView>\n *     <div *rxVirtualViewContent>Virtual View 1</div>\n *     <div *rxVirtualViewPlaceholder>Loading...</div>\n *   </div>\n * </div>\n * ```\n *\n * @developerPreview\n */\n@Directive({ selector: '[rxVirtualViewPlaceholder]', standalone: true })\nexport class RxVirtualViewPlaceholder implements _RxVirtualViewPlaceholder {\n  #virtualView = inject(_RxVirtualView);\n  constructor(public templateRef: TemplateRef<unknown>) {\n    this.#virtualView.registerPlaceholder(this);\n  }\n}\n","/**\n * Generated bundle index. Do not edit.\n */\n\nexport * from 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