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1 line
28 KiB
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{"ast":null,"code":"import { coerceElement, coerceBooleanProperty, coerceNumberProperty } from '@angular/cdk/coercion';\nimport { ɵɵdefineInjectable, Injectable, ɵɵinject, EventEmitter, Directive, ElementRef, NgZone, Output, Input, NgModule } from '@angular/core';\nimport { Observable, Subject } from 'rxjs';\nimport { debounceTime } from 'rxjs/operators';\n\n/**\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.io/license\n */\n/**\n * Factory that creates a new MutationObserver and allows us to stub it out in unit tests.\n * @docs-private\n */\nimport * as ɵngcc0 from '@angular/core';\nclass MutationObserverFactory {\n create(callback) {\n return typeof MutationObserver === 'undefined' ? null : new MutationObserver(callback);\n }\n}\nMutationObserverFactory.ɵfac = function MutationObserverFactory_Factory(t) {\n return new (t || MutationObserverFactory)();\n};\nMutationObserverFactory.ɵprov = ɵɵdefineInjectable({\n factory: function MutationObserverFactory_Factory() {\n return new MutationObserverFactory();\n },\n token: MutationObserverFactory,\n providedIn: \"root\"\n});\n(function () {\n (typeof ngDevMode === \"undefined\" || ngDevMode) && ɵngcc0.ɵsetClassMetadata(MutationObserverFactory, [{\n type: Injectable,\n args: [{\n providedIn: 'root'\n }]\n }], null, null);\n})();\n/** An injectable service that allows watching elements for changes to their content. */\nclass ContentObserver {\n constructor(_mutationObserverFactory) {\n this._mutationObserverFactory = _mutationObserverFactory;\n /** Keeps track of the existing MutationObservers so they can be reused. */\n this._observedElements = new Map();\n }\n ngOnDestroy() {\n this._observedElements.forEach((_, element) => this._cleanupObserver(element));\n }\n observe(elementOrRef) {\n const element = coerceElement(elementOrRef);\n return new Observable(observer => {\n const stream = this._observeElement(element);\n const subscription = stream.subscribe(observer);\n return () => {\n subscription.unsubscribe();\n this._unobserveElement(element);\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 _observeElement(element) {\n if (!this._observedElements.has(element)) {\n const stream = new Subject();\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, {\n observer,\n stream,\n count: 1\n });\n } else {\n this._observedElements.get(element).count++;\n }\n return this._observedElements.get(element).stream;\n }\n /**\n * Un-observes the given element and cleans up the underlying MutationObserver if nobody else is\n * observing this element.\n */\n _unobserveElement(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 /** Clean up the underlying MutationObserver for the specified element. */\n _cleanupObserver(element) {\n if (this._observedElements.has(element)) {\n const {\n observer,\n stream\n } = this._observedElements.get(element);\n if (observer) {\n observer.disconnect();\n }\n stream.complete();\n this._observedElements.delete(element);\n }\n }\n}\nContentObserver.ɵfac = function ContentObserver_Factory(t) {\n return new (t || ContentObserver)(ɵngcc0.ɵɵinject(MutationObserverFactory));\n};\nContentObserver.ɵprov = ɵɵdefineInjectable({\n factory: function ContentObserver_Factory() {
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