@angular/cdk/fesm2022/observers.mjs.map

Angular Material Component Development Kit

{"version":3,"file":"observers.mjs","sources":["../../../../../darwin_arm64-fastbuild-ST-fdfa778d11ba/bin/src/cdk/observers/observe-content.ts"],"sourcesContent":["/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.dev/license\n */\n\nimport {NumberInput, coerceElement, coerceNumberProperty} from '../coercion';\nimport {\n  AfterContentInit,\n  Directive,\n  ElementRef,\n  EventEmitter,\n  Service,\n  Input,\n  NgModule,\n  NgZone,\n  OnDestroy,\n  Output,\n  booleanAttribute,\n  inject,\n} from '@angular/core';\nimport {Observable, Observer, Subject, Subscription} from 'rxjs';\nimport {debounceTime, filter, map} from 'rxjs/operators';\n\n// Angular may add, remove, or edit comment nodes during change detection. We don't care about\n// these changes because they don't affect the user-preceived content, and worse it can cause\n// infinite change detection cycles where the change detection updates a comment, triggering the\n// MutationObserver, triggering another change detection and kicking the cycle off again.\nfunction shouldIgnoreRecord(record: MutationRecord) {\n  // Ignore changes to comment text.\n  if (record.type === 'characterData' && record.target instanceof Comment) {\n    return true;\n  }\n  // Ignore addition / removal of comments.\n  if (record.type === 'childList') {\n    for (let i = 0; i < record.addedNodes.length; i++) {\n      if (!(record.addedNodes[i] instanceof Comment)) {\n        return false;\n      }\n    }\n    for (let i = 0; i < record.removedNodes.length; i++) {\n      if (!(record.removedNodes[i] instanceof Comment)) {\n        return false;\n      }\n    }\n    return true;\n  }\n  // Observe everything else.\n  return false;\n}\n\n/**\n * Factory that creates a new MutationObserver and allows us to stub it out in unit tests.\n * @docs-private\n */\n@Service()\nexport class MutationObserverFactory {\n  create(callback: MutationCallback): MutationObserver | null {\n    return typeof MutationObserver === 'undefined' ? null : new MutationObserver(callback);\n  }\n}\n\n/** An injectable service that allows watching elements for changes to their content. */\n@Service()\nexport class ContentObserver implements OnDestroy {\n  private _mutationObserverFactory = inject(MutationObserverFactory);\n\n  /** Keeps track of the existing MutationObservers so they can be reused. */\n  private _observedElements = new Map<\n    Element,\n    {\n      observer: MutationObserver | null;\n      readonly stream: Subject<MutationRecord[]>;\n      count: number;\n    }\n  >();\n\n  private _ngZone = inject(NgZone);\n\n  ngOnDestroy() {\n    this._observedElements.forEach((_, element) => this._cleanupObserver(element));\n  }\n\n  /**\n   * Observe content changes on an element.\n   * @param element The element to observe for content changes.\n   */\n  observe(element: Element): Observable<MutationRecord[]>;\n\n  /**\n   * Observe content changes on an element.\n   * @param element The element to observe for content changes.\n   */\n  observe(element: ElementRef<Element>): Observable<MutationRecord[]>;\n\n  observe(elementOrRef: Element | ElementRef<Element>): Observable<MutationRecord[]> {\n    const element = coerceElement(elementOrRef);\n\n    return new Observable((observer: Observer<MutationRecord[]>) => {\n      const stream = this._observeElement(element);\n      const subscription = stream\n        .pipe(\n          map(records => records.filter(record => !shouldIgnoreRecord(record))),\n          filter(records => !!records.length),\n        )\n        .subscribe(records => {\n          this._ngZone.run(() => {\n            observer.next(records);\n          });\n        });\n\n      return () => {\n        subscription.unsubscribe();\n        this._unobserveElement(element);\n      };\n    });\n  }\n\n  /**\n   * Observes the given element by using the existing MutationObserver if available, or creating a\n   * new one if not.\n   */\n  private _observeElement(element: Element): Subject<MutationRecord[]> {\n    return this._ngZone.runOutsideAngular(() => {\n      if (!this._observedElements.has(element)) {\n        const stream = new Subject<MutationRecord[]>();\n        const observer = this._mutationObserverFactory.create(mutations => stream.next(mutations));\n        if (observer) {\n          observer.observe(element, {\n            characterData: true,\n            childList: true,\n            subtree: true,\n          });\n        }\n        this._observedElements.set(element, {observer, stream, count: 1});\n      } else {\n        this._observedElements.get(element)!.count++;\n      }\n      return this._observedElements.get(element)!.stream;\n    });\n  }\n\n  /**\n   * Un-observes the given element and cleans up the underlying MutationObserver if nobody else is\n   * observing this element.\n   */\n  private _unobserveElement(element: Element) {\n    if (this._observedElements.has(element)) {\n      this._observedElements.get(element)!.count--;\n      if (!this._observedElements.get(element)!.count) {\n        this._cleanupObserver(element);\n      }\n    }\n  }\n\n  /** Clean up the underlying MutationObserver for the specified element. */\n  private _cleanupObserver(element: Element) {\n    if (this._observedElements.has(element)) {\n      const {observer, stream} = this._observedElements.get(element)!;\n      if (observer) {\n        observer.disconnect();\n      }\n      stream.complete();\n      this._observedElements.delete(element);\n    }\n  }\n}\n\n/**\n * Directive that triggers a callback whenever the content of\n * its associated element has changed.\n */\n@Directive({\n  selector: '[cdkObserveContent]',\n  exportAs: 'cdkObserveContent',\n})\nexport class CdkObserveContent implements AfterContentInit, OnDestroy {\n  private _contentObserver = inject(ContentObserver);\n  private _elementRef = inject<ElementRef<HTMLElement>>(ElementRef);\n\n  /** Event emitted for each change in the element's content. */\n  @Output('cdkObserveContent') readonly event = new EventEmitter<MutationRecord[]>();\n\n  /**\n   * Whether observing content is disabled. This option can be used\n   * to disconnect the underlying MutationObserver until it is needed.\n   */\n  @Input({alias: 'cdkObserveContentDisabled', transform: booleanAttribute})\n  get disabled(): boolean {\n    return this._disabled;\n  }\n  set disabled(value: boolean) {\n    this._disabled = value;\n    this._disabled ? this._unsubscribe() : this._subscribe();\n  }\n  private _disabled = false;\n\n  /** Debounce interval for emitting the changes. */\n  @Input()\n  get debounce(): number {\n    return this._debounce!;\n  }\n  set debounce(value: NumberInput) {\n    this._debounce = coerceNumberProperty(value);\n    this._subscribe();\n  }\n  private _debounce: number | undefined;\n\n  private _currentSubscription: Subscription | null = null;\n\n  ngAfterContentInit() {\n    if (!this._currentSubscription && !this.disabled) {\n      this._subscribe();\n    }\n  }\n\n  ngOnDestroy() {\n    this._unsubscribe();\n  }\n\n  private _subscribe() {\n    this._unsubscribe();\n    const 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