/**
 * @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);
    }
}
MutationObserverFactory.ɵprov = i0.ɵɵdefineInjectable({ factory: function MutationObserverFactory_Factory() { return new MutationObserverFactory(); }, token: MutationObserverFactory, providedIn: "root" });
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);
        }
    }
}
ContentObserver.ɵprov = i0.ɵɵdefineInjectable({ factory: function ContentObserver_Factory() { return new ContentObserver(i0.ɵɵinject(MutationObserverFactory)); }, token: ContentObserver, providedIn: "root" });
ContentObserver.decorators = [
    { type: Injectable, args: [{ providedIn: 'root' },] }
];
ContentObserver.ctorParameters = () => [
    { type: MutationObserverFactory }
];
/**
 * Directive that triggers a callback whenever the content of
 * its associated element has changed.
 */
export class CdkObserveContent {
    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;
    }
    /**
     * 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();
    }
    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() {
        var _a;
        (_a = this._currentSubscription) === null || _a === void 0 ? void 0 : _a.unsubscribe();
    }
}
CdkObserveContent.decorators = [
    { type: Directive, args: [{
                selector: '[cdkObserveContent]',
                exportAs: 'cdkObserveContent',
            },] }
];
CdkObserveContent.ctorParameters = () => [
    { type: ContentObserver },
    { type: ElementRef },
    { type: NgZone }
];
CdkObserveContent.propDecorators = {
    event: [{ type: Output, args: ['cdkObserveContent',] }],
    disabled: [{ type: Input, args: ['cdkObserveContentDisabled',] }],
    debounce: [{ type: Input }]
};
export class ObserversModule {
}
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\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<Element, {\n    observer: MutationObserver | null,\n    readonly stream: Subject<MutationRecord[]>,\n    count: number\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/**\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() { return this._disabled; }\n  set disabled(value: any) {\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 { return this._debounce; }\n  set debounce(value: number) {\n    this._debounce = coerceNumberProperty(value);\n    this._subscribe();\n  }\n  private _debounce: number;\n\n  private _currentSubscription: Subscription | null = null;\n\n  constructor(private _contentObserver: ContentObserver,\n              private _elementRef: ElementRef<HTMLElement>,\n              private _ngZone: NgZone) {}\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).subscribe(this.event);\n    });\n  }\n\n  private _unsubscribe() {\n    this._currentSubscription?.unsubscribe();\n  }\n\n  static ngAcceptInputType_disabled: BooleanInput;\n  static ngAcceptInputType_debounce: NumberInput;\n}\n\n\n@NgModule({\n  exports: [CdkObserveContent],\n  declarations: [CdkObserveContent],\n  providers: [MutationObserverFactory]\n})\nexport class ObserversModule {}\n"]}