| 1 | {"version":3,"file":"observers.mjs","sources":["../../../../../../src/cdk/observers/observe-content.ts","../../../../../../src/cdk/observers/public-api.ts","../../../../../../src/cdk/observers/index.ts","../../../../../../src/cdk/observers/observers_public_index.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.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","/**\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\nexport * from './observe-content';\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\nexport * from './public-api';\n","/**\n * Generated bundle index. Do not edit.\n */\n\nexport * from './index';\n"],"names":[],"mappings":";;;;;;AAAA;;;;;;AAMG;AAwBH;;;AAGG;MAEU,uBAAuB,CAAA;AAClC,IAAA,MAAM,CAAC,QAA0B,EAAA;AAC/B,QAAA,OAAO,OAAO,gBAAgB,KAAK,WAAW,GAAG,IAAI,GAAG,IAAI,gBAAgB,CAAC,QAAQ,CAAC,CAAC;KACxF;;oHAHU,uBAAuB,EAAA,IAAA,EAAA,EAAA,EAAA,MAAA,EAAA,EAAA,CAAA,eAAA,CAAA,UAAA,EAAA,CAAA,CAAA;AAAvB,uBAAA,CAAA,KAAA,GAAA,EAAA,CAAA,qBAAA,CAAA,EAAA,UAAA,EAAA,QAAA,EAAA,OAAA,EAAA,QAAA,EAAA,QAAA,EAAA,EAAA,EAAA,IAAA,EAAA,uBAAuB,cADX,MAAM,EAAA,CAAA,CAAA;2FAClB,uBAAuB,EAAA,UAAA,EAAA,CAAA;kBADnC,UAAU;mBAAC,EAAC,UAAU,EAAE,MAAM,EAAC,CAAA;;AAOhC;MAEa,eAAe,CAAA;AAW1B,IAAA,WAAA,CAAoB,wBAAiD,EAAA;QAAjD,IAAwB,CAAA,wBAAA,GAAxB,wBAAwB,CAAyB;;AAT7D,QAAA,IAAA,CAAA,iBAAiB,GAAG,IAAI,GAAG,EAOhC,CAAC;KAEqE;IAEzE,WAAW,GAAA;AACT,QAAA,IAAI,CAAC,iBAAiB,CAAC,OAAO,CAAC,CAAC,CAAC,EAAE,OAAO,KAAK,IAAI,CAAC,gBAAgB,CAAC,OAAO,CAAC,CAAC,CAAC;KAChF;AAcD,IAAA,OAAO,CAAC,YAA2C,EAAA;AACjD,QAAA,MAAM,OAAO,GAAG,aAAa,CAAC,YAAY,CAAC,CAAC;AAE5C,QAAA,OAAO,IAAI,UAAU,CAAC,CAAC,QAAoC,KAAI;YAC7D,MAAM,MAAM,GAAG,IAAI,CAAC,eAAe,CAAC,OAAO,CAAC,CAAC;YAC7C,MAAM,YAAY,GAAG,MAAM,CAAC,SAAS,CAAC,QAAQ,CAAC,CAAC;AAEhD,YAAA,OAAO,MAAK;gBACV,YAAY,CAAC,WAAW,EAAE,CAAC;AAC3B,gBAAA,IAAI,CAAC,iBAAiB,CAAC,OAAO,CAAC,CAAC;AAClC,aAAC,CAAC;AACJ,SAAC,CAAC,CAAC;KACJ;AAED;;;AAGG;AACK,IAAA,eAAe,CAAC,OAAgB,EAAA;QACtC,IAAI,CAAC,IAAI,CAAC,iBAAiB,CAAC,GAAG,CAAC,OAAO,CAAC,EAAE;AACxC,YAAA,MAAM,MAAM,GAAG,IAAI,OAAO,EAAoB,CAAC;AAC/C,YAAA,MAAM,QAAQ,GAAG,IAAI,CAAC,wBAAwB,CAAC,MAAM,CAAC,SAAS,IAAI,MAAM,CAAC,IAAI,CAAC,SAAS,CAAC,CAAC,CAAC;AAC3F,YAAA,IAAI,QAAQ,EAAE;AACZ,gBAAA,QAAQ,CAAC,OAAO,CAAC,OAAO,EAAE;AACxB,oBAAA,aAAa,EAAE,IAAI;AACnB,oBAAA,SAAS,EAAE,IAAI;AACf,oBAAA,OAAO,EAAE,IAAI;AACd,iBAAA,CAAC,CAAC;AACJ,aAAA;AACD,YAAA,IAAI,CAAC,iBAAiB,CAAC,GAAG,CAAC,OAAO,EAAE,EAAC,QAAQ,EAAE,MAAM,EAAE,KAAK,EAAE,CAAC,EAAC,CAAC,CAAC;AACnE,SAAA;AAAM,aAAA;YACL,IAAI,CAAC,iBAAiB,CAAC,GAAG,CAAC,OAAO,CAAE,CAAC,KAAK,EAAE,CAAC;AAC9C,SAAA;QACD,OAAO,IAAI,CAAC,iBAAiB,CAAC,GAAG,CAAC,OAAO,CAAE,CAAC,MAAM,CAAC;KACpD;AAED;;;AAGG;AACK,IAAA,iBAAiB,CAAC,OAAgB,EAAA;QACxC,IAAI,IAAI,CAAC,iBAAiB,CAAC,GAAG,CAAC,OAAO,CAAC,EAAE;YACvC,IAAI,CAAC,iBAAiB,CAAC,GAAG,CAAC,OAAO,CAAE,CAAC,KAAK,EAAE,CAAC;YAC7C,IAAI,CAAC,IAAI,CAAC,iBAAiB,CAAC,GAAG,CAAC,OAAO,CAAE,CAAC,KAAK,EAAE;AAC/C,gBAAA,IAAI,CAAC,gBAAgB,CAAC,OAAO,CAAC,CAAC;AAChC,aAAA;AACF,SAAA;KACF;;AAGO,IAAA,gBAAgB,CAAC,OAAgB,EAAA;QACvC,IAAI,IAAI,CAAC,iBAAiB,CAAC,GAAG,CAAC,OAAO,CAAC,EAAE;AACvC,YAAA,MAAM,EAAC,QAAQ,EAAE,MAAM,EAAC,GAAG,IAAI,CAAC,iBAAiB,CAAC,GAAG,CAAC,OAAO,CAAE,CAAC;AAChE,YAAA,IAAI,QAAQ,EAAE;gBACZ,QAAQ,CAAC,UAAU,EAAE,CAAC;AACvB,aAAA;YACD,MAAM,CAAC,QAAQ,EAAE,CAAC;AAClB,YAAA,IAAI,CAAC,iBAAiB,CAAC,MAAM,CAAC,OAAO,CAAC,CAAC;AACxC,SAAA;KACF;;AAxFU,eAAA,CAAA,IAAA,GAAA,EAAA,CAAA,kBAAA,CAAA,EAAA,UAAA,EAAA,QAAA,EAAA,OAAA,EAAA,QAAA,EAAA,QAAA,EAAA,EAAA,EAAA,IAAA,EAAA,eAAe,kBAWoB,uBAAuB,EAAA,CAAA,EAAA,MAAA,EAAA,EAAA,CAAA,eAAA,CAAA,UAAA,EAAA,CAAA,CAAA;AAX1D,eAAA,CAAA,KAAA,GAAA,EAAA,CAAA,qBAAA,CAAA,EAAA,UAAA,EAAA,QAAA,EAAA,OAAA,EAAA,QAAA,EAAA,QAAA,EAAA,EAAA,EAAA,IAAA,EAAA,eAAe,cADH,MAAM,EAAA,CAAA,CAAA;2FAClB,eAAe,EAAA,UAAA,EAAA,CAAA;kBAD3B,UAAU;mBAAC,EAAC,UAAU,EAAE,MAAM,EAAC,CAAA;0DAYgB,uBAAuB,EAAA,CAAA,CAAA,EAAA,EAAA,CAAA,CAAA;AAgFvE;;;AAGG;MAKU,iBAAiB,CAAA;AA+B5B,IAAA,WAAA,CACU,gBAAiC,EACjC,WAAoC,EACpC,OAAe,EAAA;QAFf,IAAgB,CAAA,gBAAA,GAAhB,gBAAgB,CAAiB;QACjC,IAAW,CAAA,WAAA,GAAX,WAAW,CAAyB;QACpC,IAAO,CAAA,OAAA,GAAP,OAAO,CAAQ;;AAhCa,QAAA,IAAA,CAAA,KAAK,GAAG,IAAI,YAAY,EAAoB,CAAC;QAc3E,IAAS,CAAA,SAAA,GAAG,KAAK,CAAC;QAalB,IAAoB,CAAA,oBAAA,GAAwB,IAAI,CAAC;KAMrD;AA/BJ;;;AAGG;AACH,IAAA,IACI,QAAQ,GAAA;QACV,OAAO,IAAI,CAAC,SAAS,CAAC;KACvB;IACD,IAAI,QAAQ,CAAC,KAAmB,EAAA;AAC9B,QAAA,IAAI,CAAC,SAAS,GAAG,qBAAqB,CAAC,KAAK,CAAC,CAAC;AAC9C,QAAA,IAAI,CAAC,SAAS,GAAG,IAAI,CAAC,YAAY,EAAE,GAAG,IAAI,CAAC,UAAU,EAAE,CAAC;KAC1D;;AAID,IAAA,IACI,QAAQ,GAAA;QACV,OAAO,IAAI,CAAC,SAAS,CAAC;KACvB;IACD,IAAI,QAAQ,CAAC,KAAkB,EAAA;AAC7B,QAAA,IAAI,CAAC,SAAS,GAAG,oBAAoB,CAAC,KAAK,CAAC,CAAC;QAC7C,IAAI,CAAC,UAAU,EAAE,CAAC;KACnB;IAWD,kBAAkB,GAAA;QAChB,IAAI,CAAC,IAAI,CAAC,oBAAoB,IAAI,CAAC,IAAI,CAAC,QAAQ,EAAE;YAChD,IAAI,CAAC,UAAU,EAAE,CAAC;AACnB,SAAA;KACF;IAED,WAAW,GAAA;QACT,IAAI,CAAC,YAAY,EAAE,CAAC;KACrB;IAEO,UAAU,GAAA;QAChB,IAAI,CAAC,YAAY,EAAE,CAAC;AACpB,QAAA,MAAM,MAAM,GAAG,IAAI,CAAC,gBAAgB,CAAC,OAAO,CAAC,IAAI,CAAC,WAAW,CAAC,CAAC;;;;;AAM/D,QAAA,IAAI,CAAC,OAAO,CAAC,iBAAiB,CAAC,MAAK;AAClC,YAAA,IAAI,CAAC,oBAAoB,GAAG,CAC1B,IAAI,CAAC,QAAQ,GAAG,MAAM,CAAC,IAAI,CAAC,YAAY,CAAC,IAAI,CAAC,QAAQ,CAAC,CAAC,GAAG,MAAM,EACjE,SAAS,CAAC,IAAI,CAAC,KAAK,CAAC,CAAC;AAC1B,SAAC,CAAC,CAAC;KACJ;IAEO,YAAY,GAAA;AAClB,QAAA,IAAI,CAAC,oBAAoB,EAAE,WAAW,EAAE,CAAC;KAC1C;;AAhEU,iBAAA,CAAA,IAAA,GAAA,EAAA,CAAA,kBAAA,CAAA,EAAA,UAAA,EAAA,QAAA,EAAA,OAAA,EAAA,QAAA,EAAA,QAAA,EAAA,EAAA,EAAA,IAAA,EAAA,iBAAiB,kBAgCA,eAAe,EAAA,EAAA,EAAA,KAAA,EAAA,EAAA,CAAA,UAAA,EAAA,EAAA,EAAA,KAAA,EAAA,EAAA,CAAA,MAAA,EAAA,CAAA,EAAA,MAAA,EAAA,EAAA,CAAA,eAAA,CAAA,SAAA,EAAA,CAAA,CAAA;kGAhChC,iBAAiB,EAAA,QAAA,EAAA,qBAAA,EAAA,MAAA,EAAA,EAAA,QAAA,EAAA,CAAA,2BAAA,EAAA,UAAA,CAAA,EAAA,QAAA,EAAA,UAAA,EAAA,EAAA,OAAA,EAAA,EAAA,KAAA,EAAA,mBAAA,EAAA,EAAA,QAAA,EAAA,CAAA,mBAAA,CAAA,EAAA,QAAA,EAAA,EAAA,EAAA,CAAA,CAAA;2FAAjB,iBAAiB,EAAA,UAAA,EAAA,CAAA;kBAJ7B,SAAS;AAAC,YAAA,IAAA,EAAA,CAAA;AACT,oBAAA,QAAQ,EAAE,qBAAqB;AAC/B,oBAAA,QAAQ,EAAE,mBAAmB;AAC9B,iBAAA,CAAA;AAiC6B,SAAA,CAAA,EAAA,cAAA,EAAA,YAAA,EAAA,OAAA,CAAA,EAAA,IAAA,EAAA,eAAe,wEA9BL,KAAK,EAAA,CAAA;sBAA1C,MAAM;uBAAC,mBAAmB,CAAA;gBAOvB,QAAQ,EAAA,CAAA;sBADX,KAAK;uBAAC,2BAA2B,CAAA;gBAY9B,QAAQ,EAAA,CAAA;sBADX,KAAK;;MAqDK,eAAe,CAAA;;4GAAf,eAAe,EAAA,IAAA,EAAA,EAAA,EAAA,MAAA,EAAA,EAAA,CAAA,eAAA,CAAA,QAAA,EAAA,CAAA,CAAA;6GAAf,eAAe,EAAA,YAAA,EAAA,CAxEf,iBAAiB,CAAA,EAAA,OAAA,EAAA,CAAjB,iBAAiB,CAAA,EAAA,CAAA,CAAA;6GAwEjB,eAAe,EAAA,SAAA,EAFf,CAAC,uBAAuB,CAAC,EAAA,CAAA,CAAA;2FAEzB,eAAe,EAAA,UAAA,EAAA,CAAA;kBAL3B,QAAQ;AAAC,YAAA,IAAA,EAAA,CAAA;oBACR,OAAO,EAAE,CAAC,iBAAiB,CAAC;oBAC5B,YAAY,EAAE,CAAC,iBAAiB,CAAC;oBACjC,SAAS,EAAE,CAAC,uBAAuB,CAAC;AACrC,iBAAA,CAAA;;;ACrND;;;;;;AAMG;;ACNH;;;;;;AAMG;;ACNH;;AAEG;;;;"} |