@angular/cdk
Version:
Angular Material Component Development Kit
187 lines • 24.1 kB
JavaScript
/**
* @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.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: MutationObserverFactory, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
MutationObserverFactory.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: MutationObserverFactory, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.0.1", 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);
}
}
}
ContentObserver.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: ContentObserver, deps: [{ token: MutationObserverFactory }], target: i0.ɵɵFactoryTarget.Injectable });
ContentObserver.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: ContentObserver, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.0.1", 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 {
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() {
this._currentSubscription?.unsubscribe();
}
}
CdkObserveContent.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: CdkObserveContent, deps: [{ token: ContentObserver }, { token: i0.ElementRef }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Directive });
CdkObserveContent.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "13.0.1", type: CdkObserveContent, selector: "[cdkObserveContent]", inputs: { disabled: ["cdkObserveContentDisabled", "disabled"], debounce: "debounce" }, outputs: { event: "cdkObserveContent" }, exportAs: ["cdkObserveContent"], ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.0.1", 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 {
}
ObserversModule.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: ObserversModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
ObserversModule.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: ObserversModule, declarations: [CdkObserveContent], exports: [CdkObserveContent] });
ObserversModule.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: ObserversModule, providers: [MutationObserverFactory] });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.0.1", 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() {\n    return this._disabled;\n  }\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 {\n    return this._debounce;\n  }\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(\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  static ngAcceptInputType_disabled: BooleanInput;\n  static ngAcceptInputType_debounce: NumberInput;\n}\n\n@NgModule({\n  exports: [CdkObserveContent],\n  declarations: [CdkObserveContent],\n  providers: [MutationObserverFactory],\n})\nexport class ObserversModule {}\n"]}