@angular/core
Version:
Angular - the core framework
128 lines • 14.1 kB
JavaScript
/**
* @license
* Copyright Google Inc. 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 * as tslib_1 from "tslib";
/// <reference types="rxjs" />
import { Subject, Subscription } from 'rxjs';
/**
* Use in components with the `@Output` directive to emit custom events
* synchronously or asynchronously, and register handlers for those events
* by subscribing to an instance.
*
* @usageNotes
*
* Extends
* [RxJS `Subject`](https://rxjs.dev/api/index/class/Subject)
* for Angular by adding the `emit()` method.
*
* In the following example, a component defines two output properties
* that create event emitters. When the title is clicked, the emitter
* emits an open or close event to toggle the current visibility state.
*
* ```html
* @Component({
* selector: 'zippy',
* template: `
* <div class="zippy">
* <div (click)="toggle()">Toggle</div>
* <div [hidden]="!visible">
* <ng-content></ng-content>
* </div>
* </div>`})
* export class Zippy {
* visible: boolean = true;
* @Output() open: EventEmitter<any> = new EventEmitter();
* @Output() close: EventEmitter<any> = new EventEmitter();
*
* toggle() {
* this.visible = !this.visible;
* if (this.visible) {
* this.open.emit(null);
* } else {
* this.close.emit(null);
* }
* }
* }
* ```
*
* Access the event object with the `$event` argument passed to the output event
* handler:
*
* ```html
* <zippy (open)="onOpen($event)" (close)="onClose($event)"></zippy>
* ```
*
* @see [Observables in Angular](guide/observables-in-angular)
* @publicApi
*/
var EventEmitter = /** @class */ (function (_super) {
tslib_1.__extends(EventEmitter, _super);
/**
* Creates an instance of this class that can
* deliver events synchronously or asynchronously.
*
* @param isAsync When true, deliver events asynchronously.
*
*/
function EventEmitter(isAsync) {
if (isAsync === void 0) { isAsync = false; }
var _this = _super.call(this) || this;
_this.__isAsync = isAsync;
return _this;
}
/**
* Emits an event containing a given value.
* @param value The value to emit.
*/
EventEmitter.prototype.emit = function (value) { _super.prototype.next.call(this, value); };
/**
* Registers handlers for events emitted by this instance.
* @param generatorOrNext When supplied, a custom handler for emitted events.
* @param error When supplied, a custom handler for an error notification
* from this emitter.
* @param complete When supplied, a custom handler for a completion
* notification from this emitter.
*/
EventEmitter.prototype.subscribe = function (generatorOrNext, error, complete) {
var schedulerFn;
var errorFn = function (err) { return null; };
var completeFn = function () { return null; };
if (generatorOrNext && typeof generatorOrNext === 'object') {
schedulerFn = this.__isAsync ? function (value) {
setTimeout(function () { return generatorOrNext.next(value); });
} : function (value) { generatorOrNext.next(value); };
if (generatorOrNext.error) {
errorFn = this.__isAsync ? function (err) { setTimeout(function () { return generatorOrNext.error(err); }); } :
function (err) { generatorOrNext.error(err); };
}
if (generatorOrNext.complete) {
completeFn = this.__isAsync ? function () { setTimeout(function () { return generatorOrNext.complete(); }); } :
function () { generatorOrNext.complete(); };
}
}
else {
schedulerFn = this.__isAsync ? function (value) { setTimeout(function () { return generatorOrNext(value); }); } :
function (value) { generatorOrNext(value); };
if (error) {
errorFn =
this.__isAsync ? function (err) { setTimeout(function () { return error(err); }); } : function (err) { error(err); };
}
if (complete) {
completeFn =
this.__isAsync ? function () { setTimeout(function () { return complete(); }); } : function () { complete(); };
}
}
var sink = _super.prototype.subscribe.call(this, schedulerFn, errorFn, completeFn);
if (generatorOrNext instanceof Subscription) {
generatorOrNext.add(sink);
}
return sink;
};
return EventEmitter;
}(Subject));
export { EventEmitter };
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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/// <reference types=\"rxjs\" />\n\nimport {Subject, Subscription} from 'rxjs';\n\n/**\n * Use in components with the `@Output` directive to emit custom events\n * synchronously or asynchronously, and register handlers for those events\n * by subscribing to an instance.\n *\n * @usageNotes\n *\n * Extends\n * [RxJS `Subject`](https://rxjs.dev/api/index/class/Subject)\n * for Angular by adding the `emit()` method.\n *\n * In the following example, a component defines two output properties\n * that create event emitters. When the title is clicked, the emitter\n * emits an open or close event to toggle the current visibility state.\n *\n * ```html\n * @Component({\n *   selector: 'zippy',\n *   template: `\n *   <div class=\"zippy\">\n *     <div (click)=\"toggle()\">Toggle</div>\n *     <div [hidden]=\"!visible\">\n *       <ng-content></ng-content>\n *     </div>\n *  </div>`})\n * export class Zippy {\n *   visible: boolean = true;\n *   @Output() open: EventEmitter<any> = new EventEmitter();\n *   @Output() close: EventEmitter<any> = new EventEmitter();\n *\n *   toggle() {\n *     this.visible = !this.visible;\n *     if (this.visible) {\n *       this.open.emit(null);\n *     } else {\n *       this.close.emit(null);\n *     }\n *   }\n * }\n * ```\n *\n * Access the event object with the `$event` argument passed to the output event\n * handler:\n *\n * ```html\n * <zippy (open)=\"onOpen($event)\" (close)=\"onClose($event)\"></zippy>\n * ```\n *\n * @see [Observables in Angular](guide/observables-in-angular)\n * @publicApi\n */\nexport class EventEmitter<T extends any> extends Subject<T> {\n  // TODO: mark this as internal once all the facades are gone\n  // we can't mark it as internal now because EventEmitter exported via @angular/core would not\n  // contain this property making it incompatible with all the code that uses EventEmitter via\n  // facades, which are local to the code and do not have this property stripped.\n  /**\n   * Internal\n   */\n  __isAsync: boolean;  // tslint:disable-line\n\n  /**\n   * Creates an instance of this class that can\n   * deliver events synchronously or asynchronously.\n   *\n   * @param isAsync When true, deliver events asynchronously.\n   *\n   */\n  constructor(isAsync: boolean = false) {\n    super();\n    this.__isAsync = isAsync;\n  }\n\n  /**\n   * Emits an event containing a given value.\n   * @param value The value to emit.\n   */\n  emit(value?: T) { super.next(value); }\n\n  /**\n   * Registers handlers for events emitted by this instance.\n   * @param generatorOrNext When supplied, a custom handler for emitted events.\n   * @param error When supplied, a custom handler for an error notification\n   * from this emitter.\n   * @param complete When supplied, a custom handler for a completion\n   * notification from this emitter.\n   */\n  subscribe(generatorOrNext?: any, error?: any, complete?: any): Subscription {\n    let schedulerFn: (t: any) => any;\n    let errorFn = (err: any): any => null;\n    let completeFn = (): any => null;\n\n    if (generatorOrNext && typeof generatorOrNext === 'object') {\n      schedulerFn = this.__isAsync ? (value: any) => {\n        setTimeout(() => generatorOrNext.next(value));\n      } : (value: any) => { generatorOrNext.next(value); };\n\n      if (generatorOrNext.error) {\n        errorFn = this.__isAsync ? (err) => { setTimeout(() => generatorOrNext.error(err)); } :\n                                   (err) => { generatorOrNext.error(err); };\n      }\n\n      if (generatorOrNext.complete) {\n        completeFn = this.__isAsync ? () => { setTimeout(() => generatorOrNext.complete()); } :\n                                      () => { generatorOrNext.complete(); };\n      }\n    } else {\n      schedulerFn = this.__isAsync ? (value: any) => { setTimeout(() => generatorOrNext(value)); } :\n                                     (value: any) => { generatorOrNext(value); };\n\n      if (error) {\n        errorFn =\n            this.__isAsync ? 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