/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { coerceBooleanProperty, coerceNumberProperty, coerceElement, } from '@angular/cdk/coercion'; import { Directive, ElementRef, EventEmitter, Injectable, Input, NgModule, NgZone, Output, } from '@angular/core'; import { Observable, Subject } from 'rxjs'; import { debounceTime } from 'rxjs/operators'; import * as i0 from "@angular/core"; /** * Factory that creates a new MutationObserver and allows us to stub it out in unit tests. * @docs-private */ export class MutationObserverFactory { create(callback) { return typeof MutationObserver === 'undefined' ? null : new MutationObserver(callback); } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: MutationObserverFactory, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); } static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: MutationObserverFactory, providedIn: 'root' }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: MutationObserverFactory, decorators: [{ type: Injectable, args: [{ providedIn: 'root' }] }] }); /** An injectable service that allows watching elements for changes to their content. */ export class ContentObserver { constructor(_mutationObserverFactory) { this._mutationObserverFactory = _mutationObserverFactory; /** Keeps track of the existing MutationObservers so they can be reused. */ this._observedElements = new Map(); } ngOnDestroy() { this._observedElements.forEach((_, element) => this._cleanupObserver(element)); } observe(elementOrRef) { const element = coerceElement(elementOrRef); return new Observable((observer) => { const stream = this._observeElement(element); const subscription = stream.subscribe(observer); return () => { subscription.unsubscribe(); this._unobserveElement(element); }; }); } /** * Observes the given element by using the existing MutationObserver if available, or creating a * new one if not. */ _observeElement(element) { if (!this._observedElements.has(element)) { const stream = new Subject(); const observer = this._mutationObserverFactory.create(mutations => stream.next(mutations)); if (observer) { observer.observe(element, { characterData: true, childList: true, subtree: true, }); } this._observedElements.set(element, { observer, stream, count: 1 }); } else { this._observedElements.get(element).count++; } return this._observedElements.get(element).stream; } /** * Un-observes the given element and cleans up the underlying MutationObserver if nobody else is * observing this element. */ _unobserveElement(element) { if (this._observedElements.has(element)) { this._observedElements.get(element).count--; if (!this._observedElements.get(element).count) { this._cleanupObserver(element); } } } /** Clean up the underlying MutationObserver for the specified element. */ _cleanupObserver(element) { if (this._observedElements.has(element)) { const { observer, stream } = this._observedElements.get(element); if (observer) { observer.disconnect(); } stream.complete(); this._observedElements.delete(element); } } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ContentObserver, deps: [{ token: MutationObserverFactory }], target: i0.ɵɵFactoryTarget.Injectable }); } static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ContentObserver, providedIn: 'root' }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ContentObserver, decorators: [{ type: Injectable, args: [{ providedIn: 'root' }] }], ctorParameters: function () { return [{ type: MutationObserverFactory }]; } }); /** * Directive that triggers a callback whenever the content of * its associated element has changed. */ export class CdkObserveContent { /** * Whether observing content is disabled. This option can be used * to disconnect the underlying MutationObserver until it is needed. */ get disabled() { return this._disabled; } set disabled(value) { this._disabled = coerceBooleanProperty(value); this._disabled ? this._unsubscribe() : this._subscribe(); } /** Debounce interval for emitting the changes. */ get debounce() { return this._debounce; } set debounce(value) { this._debounce = coerceNumberProperty(value); this._subscribe(); } constructor(_contentObserver, _elementRef, _ngZone) { this._contentObserver = _contentObserver; this._elementRef = _elementRef; this._ngZone = _ngZone; /** Event emitted for each change in the element's content. */ this.event = new EventEmitter(); this._disabled = false; this._currentSubscription = null; } ngAfterContentInit() { if (!this._currentSubscription && !this.disabled) { this._subscribe(); } } ngOnDestroy() { this._unsubscribe(); } _subscribe() { this._unsubscribe(); const stream = this._contentObserver.observe(this._elementRef); // TODO(mmalerba): We shouldn't be emitting on this @Output() outside the zone. // Consider brining it back inside the zone next time we're making breaking changes. // Bringing it back inside can cause things like infinite change detection loops and changed // after checked errors if people's code isn't handling it properly. this._ngZone.runOutsideAngular(() => { this._currentSubscription = (this.debounce ? stream.pipe(debounceTime(this.debounce)) : stream).subscribe(this.event); }); } _unsubscribe() { this._currentSubscription?.unsubscribe(); } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkObserveContent, deps: [{ token: ContentObserver }, { token: i0.ElementRef }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Directive }); } static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkObserveContent, selector: "[cdkObserveContent]", inputs: { disabled: ["cdkObserveContentDisabled", "disabled"], debounce: "debounce" }, outputs: { event: "cdkObserveContent" }, exportAs: ["cdkObserveContent"], ngImport: i0 }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkObserveContent, decorators: [{ type: Directive, args: [{ selector: '[cdkObserveContent]', exportAs: 'cdkObserveContent', }] }], ctorParameters: function () { return [{ type: ContentObserver }, { type: i0.ElementRef }, { type: i0.NgZone }]; }, propDecorators: { event: [{ type: Output, args: ['cdkObserveContent'] }], disabled: [{ type: Input, args: ['cdkObserveContentDisabled'] }], debounce: [{ type: Input }] } }); export class ObserversModule { static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ObserversModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule }); } static { this.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "14.0.0", version: "16.1.1", ngImport: i0, type: ObserversModule, declarations: [CdkObserveContent], exports: [CdkObserveContent] }); } static { this.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ObserversModule, providers: [MutationObserverFactory] }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ObserversModule, decorators: [{ type: NgModule, args: [{ exports: [CdkObserveContent], declarations: [CdkObserveContent], providers: [MutationObserverFactory], }] }] }); //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  coerceBooleanProperty,\n  coerceNumberProperty,\n  coerceElement,\n  BooleanInput,\n  NumberInput,\n} from '@angular/cdk/coercion';\nimport {\n  AfterContentInit,\n  Directive,\n  ElementRef,\n  EventEmitter,\n  Injectable,\n  Input,\n  NgModule,\n  NgZone,\n  OnDestroy,\n  Output,\n} from '@angular/core';\nimport {Observable, Subject, Subscription, Observer} from 'rxjs';\nimport {debounceTime} from 'rxjs/operators';\n\n/**\n * Factory that creates a new MutationObserver and allows us to stub it out in unit tests.\n * @docs-private\n */\n@Injectable({providedIn: 'root'})\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@Injectable({providedIn: 'root'})\nexport class ContentObserver implements OnDestroy {\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  constructor(private _mutationObserverFactory: MutationObserverFactory) {}\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.subscribe(observer);\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    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   * 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  /** 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('cdkObserveContentDisabled')\n  get disabled(): boolean {\n    return this._disabled;\n  }\n  set disabled(value: BooleanInput) {\n    this._disabled = coerceBooleanProperty(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;\n\n  private _currentSubscription: Subscription | null = null;\n\n  constructor(\n    private _contentObserver: ContentObserver,\n    private _elementRef: ElementRef<HTMLElement>,\n    private _ngZone: NgZone,\n  ) {}\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 stream = this._contentObserver.observe(this._elementRef);\n\n    // TODO(mmalerba): We shouldn't be emitting on this @Output() outside the zone.\n    // Consider brining it back inside the zone next time we're making breaking changes.\n    // Bringing it back inside can cause things like infinite change detection loops and changed\n    // after checked errors if people's code isn't handling it properly.\n    this._ngZone.runOutsideAngular(() => {\n      this._currentSubscription = (\n        this.debounce ? stream.pipe(debounceTime(this.debounce)) : stream\n      ).subscribe(this.event);\n    });\n  }\n\n  private _unsubscribe() {\n    this._currentSubscription?.unsubscribe();\n  }\n}\n\n@NgModule({\n  exports: [CdkObserveContent],\n  declarations: [CdkObserveContent],\n  providers: [MutationObserverFactory],\n})\nexport class ObserversModule {}\n"]}