@angular/elements
Version:
Angular - library for using Angular Components as Custom Elements
250 lines • 37.1 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 { ApplicationRef, ChangeDetectorRef, ComponentFactoryResolver, Injector, NgZone, SimpleChange } from '@angular/core';
import { merge, ReplaySubject } from 'rxjs';
import { map, switchMap } from 'rxjs/operators';
import { extractProjectableNodes } from './extract-projectable-nodes';
import { isFunction, scheduler, strictEquals } from './utils';
/** Time in milliseconds to wait before destroying the component ref when disconnected. */
const DESTROY_DELAY = 10;
/**
* Factory that creates new ComponentNgElementStrategy instance. Gets the component factory with the
* constructor's injector's factory resolver and passes that factory to each strategy.
*/
export class ComponentNgElementStrategyFactory {
constructor(component, injector) {
this.componentFactory =
injector.get(ComponentFactoryResolver).resolveComponentFactory(component);
}
create(injector) {
return new ComponentNgElementStrategy(this.componentFactory, injector);
}
}
/**
* Creates and destroys a component ref using a component factory and handles change detection
* in response to input changes.
*/
export class ComponentNgElementStrategy {
constructor(componentFactory, injector) {
this.componentFactory = componentFactory;
this.injector = injector;
// Subject of `NgElementStrategyEvent` observables corresponding to the component's outputs.
this.eventEmitters = new ReplaySubject(1);
/** Merged stream of the component's output events. */
this.events = this.eventEmitters.pipe(switchMap(emitters => merge(...emitters)));
/** Reference to the component that was created on connect. */
this.componentRef = null;
/** Reference to the component view's `ChangeDetectorRef`. */
this.viewChangeDetectorRef = null;
/**
* Changes that have been made to component inputs since the last change detection run.
* (NOTE: These are only recorded if the component implements the `OnChanges` interface.)
*/
this.inputChanges = null;
/** Whether changes have been made to component inputs since the last change detection run. */
this.hasInputChanges = false;
/** Whether the created component implements the `OnChanges` interface. */
this.implementsOnChanges = false;
/** Whether a change detection has been scheduled to run on the component. */
this.scheduledChangeDetectionFn = null;
/** Callback function that when called will cancel a scheduled destruction on the component. */
this.scheduledDestroyFn = null;
/** Initial input values that were set before the component was created. */
this.initialInputValues = new Map();
this.unchangedInputs =
new Set(this.componentFactory.inputs.map(({ propName }) => propName));
this.ngZone = this.injector.get(NgZone);
this.elementZone = (typeof Zone === 'undefined') ? null : this.ngZone.run(() => Zone.current);
}
/**
* Initializes a new component if one has not yet been created and cancels any scheduled
* destruction.
*/
connect(element) {
this.runInZone(() => {
// If the element is marked to be destroyed, cancel the task since the component was
// reconnected
if (this.scheduledDestroyFn !== null) {
this.scheduledDestroyFn();
this.scheduledDestroyFn = null;
return;
}
if (this.componentRef === null) {
this.initializeComponent(element);
}
});
}
/**
* Schedules the component to be destroyed after some small delay in case the element is just
* being moved across the DOM.
*/
disconnect() {
this.runInZone(() => {
// Return if there is no componentRef or the component is already scheduled for destruction
if (this.componentRef === null || this.scheduledDestroyFn !== null) {
return;
}
// Schedule the component to be destroyed after a small timeout in case it is being
// moved elsewhere in the DOM
this.scheduledDestroyFn = scheduler.schedule(() => {
if (this.componentRef !== null) {
this.componentRef.destroy();
this.componentRef = null;
this.viewChangeDetectorRef = null;
}
}, DESTROY_DELAY);
});
}
/**
* Returns the component property value. If the component has not yet been created, the value is
* retrieved from the cached initialization values.
*/
getInputValue(property) {
return this.runInZone(() => {
if (this.componentRef === null) {
return this.initialInputValues.get(property);
}
return this.componentRef.instance[property];
});
}
/**
* Sets the input value for the property. If the component has not yet been created, the value is
* cached and set when the component is created.
*/
setInputValue(property, value, transform) {
this.runInZone(() => {
if (transform) {
value = transform.call(this.componentRef?.instance, value);
}
if (this.componentRef === null) {
this.initialInputValues.set(property, value);
return;
}
// Ignore the value if it is strictly equal to the current value, except if it is `undefined`
// and this is the first change to the value (because an explicit `undefined` _is_ strictly
// equal to not having a value set at all, but we still need to record this as a change).
if (strictEquals(value, this.getInputValue(property)) &&
!((value === undefined) && this.unchangedInputs.has(property))) {
return;
}
// Record the changed value and update internal state to reflect the fact that this input has
// changed.
this.recordInputChange(property, value);
this.unchangedInputs.delete(property);
this.hasInputChanges = true;
// Update the component instance and schedule change detection.
this.componentRef.instance[property] = value;
this.scheduleDetectChanges();
});
}
/**
* Creates a new component through the component factory with the provided element host and
* sets up its initial inputs, listens for outputs changes, and runs an initial change detection.
*/
initializeComponent(element) {
const childInjector = Injector.create({ providers: [], parent: this.injector });
const projectableNodes = extractProjectableNodes(element, this.componentFactory.ngContentSelectors);
this.componentRef = this.componentFactory.create(childInjector, projectableNodes, element);
this.viewChangeDetectorRef = this.componentRef.injector.get(ChangeDetectorRef);
this.implementsOnChanges = isFunction(this.componentRef.instance.ngOnChanges);
this.initializeInputs();
this.initializeOutputs(this.componentRef);
this.detectChanges();
const applicationRef = this.injector.get(ApplicationRef);
applicationRef.attachView(this.componentRef.hostView);
}
/** Set any stored initial inputs on the component's properties. */
initializeInputs() {
this.componentFactory.inputs.forEach(({ propName, transform }) => {
if (this.initialInputValues.has(propName)) {
// Call `setInputValue()` now that the component has been instantiated to update its
// properties and fire `ngOnChanges()`.
this.setInputValue(propName, this.initialInputValues.get(propName), transform);
}
});
this.initialInputValues.clear();
}
/** Sets up listeners for the component's outputs so that the events stream emits the events. */
initializeOutputs(componentRef) {
const eventEmitters = this.componentFactory.outputs.map(({ propName, templateName }) => {
const emitter = componentRef.instance[propName];
return emitter.pipe(map(value => ({ name: templateName, value })));
});
this.eventEmitters.next(eventEmitters);
}
/** Calls ngOnChanges with all the inputs that have changed since the last call. */
callNgOnChanges(componentRef) {
if (!this.implementsOnChanges || this.inputChanges === null) {
return;
}
// Cache the changes and set inputChanges to null to capture any changes that might occur
// during ngOnChanges.
const inputChanges = this.inputChanges;
this.inputChanges = null;
componentRef.instance.ngOnChanges(inputChanges);
}
/**
* Marks the component view for check, if necessary.
* (NOTE: This is required when the `ChangeDetectionStrategy` is set to `OnPush`.)
*/
markViewForCheck(viewChangeDetectorRef) {
if (this.hasInputChanges) {
this.hasInputChanges = false;
viewChangeDetectorRef.markForCheck();
}
}
/**
* Schedules change detection to run on the component.
* Ignores subsequent calls if already scheduled.
*/
scheduleDetectChanges() {
if (this.scheduledChangeDetectionFn) {
return;
}
this.scheduledChangeDetectionFn = scheduler.scheduleBeforeRender(() => {
this.scheduledChangeDetectionFn = null;
this.detectChanges();
});
}
/**
* Records input changes so that the component receives SimpleChanges in its onChanges function.
*/
recordInputChange(property, currentValue) {
// Do not record the change if the component does not implement `OnChanges`.
if (!this.implementsOnChanges) {
return;
}
if (this.inputChanges === null) {
this.inputChanges = {};
}
// If there already is a change, modify the current value to match but leave the values for
// `previousValue` and `isFirstChange`.
const pendingChange = this.inputChanges[property];
if (pendingChange) {
pendingChange.currentValue = currentValue;
return;
}
const isFirstChange = this.unchangedInputs.has(property);
const previousValue = isFirstChange ? undefined : this.getInputValue(property);
this.inputChanges[property] = new SimpleChange(previousValue, currentValue, isFirstChange);
}
/** Runs change detection on the component. */
detectChanges() {
if (this.componentRef === null) {
return;
}
this.callNgOnChanges(this.componentRef);
this.markViewForCheck(this.viewChangeDetectorRef);
this.componentRef.changeDetectorRef.detectChanges();
}
/** Runs in the angular zone, if present. */
runInZone(fn) {
return (this.elementZone && Zone.current !== this.elementZone) ? this.ngZone.run(fn) : fn();
}
}
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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 {ApplicationRef, ChangeDetectorRef, ComponentFactory, ComponentFactoryResolver, ComponentRef, EventEmitter, Injector, NgZone, OnChanges, SimpleChange, SimpleChanges, Type} from '@angular/core';\nimport {merge, Observable, ReplaySubject} from 'rxjs';\nimport {map, switchMap} from 'rxjs/operators';\n\nimport {NgElementStrategy, NgElementStrategyEvent, NgElementStrategyFactory} from './element-strategy';\nimport {extractProjectableNodes} from './extract-projectable-nodes';\nimport {isFunction, scheduler, strictEquals} from './utils';\n\n/** Time in milliseconds to wait before destroying the component ref when disconnected. */\nconst DESTROY_DELAY = 10;\n\n/**\n * Factory that creates new ComponentNgElementStrategy instance. Gets the component factory with the\n * constructor's injector's factory resolver and passes that factory to each strategy.\n */\nexport class ComponentNgElementStrategyFactory implements NgElementStrategyFactory {\n  componentFactory: ComponentFactory<any>;\n\n  constructor(component: Type<any>, injector: Injector) {\n    this.componentFactory =\n        injector.get(ComponentFactoryResolver).resolveComponentFactory(component);\n  }\n\n  create(injector: Injector) {\n    return new ComponentNgElementStrategy(this.componentFactory, injector);\n  }\n}\n\n/**\n * Creates and destroys a component ref using a component factory and handles change detection\n * in response to input changes.\n */\nexport class ComponentNgElementStrategy implements NgElementStrategy {\n  // Subject of `NgElementStrategyEvent` observables corresponding to the component's outputs.\n  private eventEmitters = new ReplaySubject<Observable<NgElementStrategyEvent>[]>(1);\n\n  /** Merged stream of the component's output events. */\n  readonly events = this.eventEmitters.pipe(switchMap(emitters => merge(...emitters)));\n\n  /** Reference to the component that was created on connect. */\n  private componentRef: ComponentRef<any>|null = null;\n\n  /** Reference to the component view's `ChangeDetectorRef`. */\n  private viewChangeDetectorRef: ChangeDetectorRef|null = null;\n\n  /**\n   * Changes that have been made to component inputs since the last change detection run.\n   * (NOTE: These are only recorded if the component implements the `OnChanges` interface.)\n   */\n  private inputChanges: SimpleChanges|null = null;\n\n  /** Whether changes have been made to component inputs since the last change detection run. */\n  private hasInputChanges = false;\n\n  /** Whether the created component implements the `OnChanges` interface. */\n  private implementsOnChanges = false;\n\n  /** Whether a change detection has been scheduled to run on the component. */\n  private scheduledChangeDetectionFn: (() => void)|null = null;\n\n  /** Callback function that when called will cancel a scheduled destruction on the component. */\n  private scheduledDestroyFn: (() => void)|null = null;\n\n  /** Initial input values that were set before the component was created. */\n  private readonly initialInputValues = new Map<string, any>();\n\n  /**\n   * Set of component inputs that have not yet changed, i.e. for which `recordInputChange()` has not\n   * fired.\n   * (This helps detect the first change of an input, even if it is explicitly set to `undefined`.)\n   */\n  private readonly unchangedInputs: Set<string>;\n\n  /** Service for setting zone context. */\n  private readonly ngZone: NgZone;\n\n  /** The zone the element was created in or `null` if Zone.js is not loaded. */\n  private readonly elementZone: Zone|null;\n\n\n  constructor(private componentFactory: ComponentFactory<any>, private injector: Injector) {\n    this.unchangedInputs =\n        new Set<string>(this.componentFactory.inputs.map(({propName}) => propName));\n    this.ngZone = this.injector.get<NgZone>(NgZone);\n    this.elementZone = (typeof Zone === 'undefined') ? null : this.ngZone.run(() => Zone.current);\n  }\n\n  /**\n   * Initializes a new component if one has not yet been created and cancels any scheduled\n   * destruction.\n   */\n  connect(element: HTMLElement) {\n    this.runInZone(() => {\n      // If the element is marked to be destroyed, cancel the task since the component was\n      // reconnected\n      if (this.scheduledDestroyFn !== null) {\n        this.scheduledDestroyFn();\n        this.scheduledDestroyFn = null;\n        return;\n      }\n\n      if (this.componentRef === null) {\n        this.initializeComponent(element);\n      }\n    });\n  }\n\n  /**\n   * Schedules the component to be destroyed after some small delay in case the element is just\n   * being moved across the DOM.\n   */\n  disconnect() {\n    this.runInZone(() => {\n      // Return if there is no componentRef or the component is already scheduled for destruction\n      if (this.componentRef === null || this.scheduledDestroyFn !== null) {\n        return;\n      }\n\n      // Schedule the component to be destroyed after a small timeout in case it is being\n      // moved elsewhere in the DOM\n      this.scheduledDestroyFn = scheduler.schedule(() => {\n        if (this.componentRef !== null) {\n          this.componentRef.destroy();\n          this.componentRef = null;\n          this.viewChangeDetectorRef = null;\n        }\n      }, DESTROY_DELAY);\n    });\n  }\n\n  /**\n   * Returns the component property value. If the component has not yet been created, the value is\n   * retrieved from the cached initialization values.\n   */\n  getInputValue(property: string): any {\n    return this.runInZone(() => {\n      if (this.componentRef === null) {\n        return this.initialInputValues.get(property);\n      }\n\n      return this.componentRef.instance[property];\n    });\n  }\n\n  /**\n   * Sets the input value for the property. If the component has not yet been created, the value is\n   * cached and set when the component is created.\n   */\n  setInputValue(property: string, value: any, transform?: (value: any) => any): void {\n    this.runInZone(() => {\n      if (transform) {\n        value = transform.call(this.componentRef?.instance, value);\n      }\n\n      if (this.componentRef === null) {\n        this.initialInputValues.set(property, value);\n        return;\n      }\n\n      // Ignore the value if it is strictly equal to the current value, except if it is `undefined`\n      // and this is the first change to the value (because an explicit `undefined` _is_ strictly\n      // equal to not having a value set at all, but we still need to record this as a change).\n      if (strictEquals(value, this.getInputValue(property)) &&\n          !((value === undefined) && this.unchangedInputs.has(property))) {\n        return;\n      }\n\n      // Record the changed value and update internal state to reflect the fact that this input has\n      // changed.\n      this.recordInputChange(property, value);\n      this.unchangedInputs.delete(property);\n      this.hasInputChanges = true;\n\n      // Update the component instance and schedule change detection.\n      this.componentRef.instance[property] = value;\n      this.scheduleDetectChanges();\n    });\n  }\n\n  /**\n   * Creates a new component through the component factory with the provided element host and\n   * sets up its initial inputs, listens for outputs changes, and runs an initial change detection.\n   */\n  protected initializeComponent(element: HTMLElement) {\n    const childInjector = Injector.create({providers: [], parent: this.injector});\n    const projectableNodes =\n        extractProjectableNodes(element, this.componentFactory.ngContentSelectors);\n    this.componentRef = this.componentFactory.create(childInjector, projectableNodes, element);\n    this.viewChangeDetectorRef = this.componentRef.injector.get(ChangeDetectorRef);\n\n    this.implementsOnChanges = isFunction((this.componentRef.instance as OnChanges).ngOnChanges);\n\n    this.initializeInputs();\n    this.initializeOutputs(this.componentRef);\n\n    this.detectChanges();\n\n    const applicationRef = this.injector.get<ApplicationRef>(ApplicationRef);\n    applicationRef.attachView(this.componentRef.hostView);\n  }\n\n  /** Set any stored initial inputs on the component's properties. */\n  protected initializeInputs(): void {\n    this.componentFactory.inputs.forEach(({propName, transform}) => {\n      if (this.initialInputValues.has(propName)) {\n        // Call `setInputValue()` now that the component has been instantiated to update its\n        // properties and fire `ngOnChanges()`.\n        this.setInputValue(propName, this.initialInputValues.get(propName), transform);\n      }\n    });\n\n    this.initialInputValues.clear();\n  }\n\n  /** Sets up listeners for the component's outputs so that the events stream emits the events. */\n  protected initializeOutputs(componentRef: ComponentRef<any>): void {\n    const eventEmitters: Observable<NgElementStrategyEvent>[] =\n        this.componentFactory.outputs.map(({propName, templateName}) => {\n          const emitter: EventEmitter<any> = componentRef.instance[propName];\n          return emitter.pipe(map(value => ({name: templateName, value})));\n        });\n\n    this.eventEmitters.next(eventEmitters);\n  }\n\n  /** Calls ngOnChanges with all the inputs that have changed since the last call. */\n  protected callNgOnChanges(componentRef: ComponentRef<any>): void {\n    if (!this.implementsOnChanges || this.inputChanges === null) {\n      return;\n    }\n\n    // Cache the changes and set inputChanges to null to capture any changes that might occur\n    // during ngOnChanges.\n    const inputChanges = this.inputChanges;\n    this.inputChanges = null;\n    (componentRef.instance as OnChanges).ngOnChanges(inputChanges);\n  }\n\n  /**\n   * Marks the component view for check, if necessary.\n   * (NOTE: This is required when the `ChangeDetectionStrategy` is set to `OnPush`.)\n   */\n  protected markViewForCheck(viewChangeDetectorRef: ChangeDetectorRef): void {\n    if (this.hasInputChanges) {\n      this.hasInputChanges = false;\n      viewChangeDetectorRef.markForCheck();\n    }\n  }\n\n  /**\n   * Schedules change detection to run on the component.\n   * Ignores subsequent calls if already scheduled.\n   */\n  protected scheduleDetectChanges(): void {\n    if (this.scheduledChangeDetectionFn) {\n      return;\n    }\n\n    this.scheduledChangeDetectionFn = scheduler.scheduleBeforeRender(() => {\n      this.scheduledChangeDetectionFn = null;\n      this.detectChanges();\n    });\n  }\n\n  /**\n   * Records input changes so that the component receives SimpleChanges in its onChanges function.\n   */\n  protected recordInputChange(property: string, currentValue: any): void {\n    // Do not record the change if the component does not implement `OnChanges`.\n    if (!this.implementsOnChanges) {\n      return;\n    }\n\n    if (this.inputChanges === null) {\n      this.inputChanges = {};\n    }\n\n    // If there already is a change, modify the current value to match but leave the values for\n    // `previousValue` and `isFirstChange`.\n    const pendingChange = this.inputChanges[property];\n    if (pendingChange) {\n      pendingChange.currentValue = currentValue;\n      return;\n    }\n\n    const isFirstChange = this.unchangedInputs.has(property);\n    const previousValue = isFirstChange ? undefined : this.getInputValue(property);\n    this.inputChanges[property] = new SimpleChange(previousValue, currentValue, isFirstChange);\n  }\n\n  /** Runs change detection on the component. */\n  protected detectChanges(): void {\n    if (this.componentRef === null) {\n      return;\n    }\n\n    this.callNgOnChanges(this.componentRef);\n    this.markViewForCheck(this.viewChangeDetectorRef!);\n    this.componentRef.changeDetectorRef.detectChanges();\n  }\n\n  /** Runs in the angular zone, if present. */\n  private runInZone(fn: () => unknown) {\n    return (this.elementZone && Zone.current !== this.elementZone) ? this.ngZone.run(fn) : fn();\n  }\n}\n"]}