@angular/cdk
Version:
Angular Material Component Development Kit
55 lines • 5.82 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 { Injectable } from '@angular/core';
import * as i0 from "@angular/core";
/**
* Class to coordinate unique selection based on name.
* Intended to be consumed as an Angular service.
* This service is needed because native radio change events are only fired on the item currently
* being selected, and we still need to uncheck the previous selection.
*
* This service does not *store* any IDs and names because they may change at any time, so it is
* less error-prone if they are simply passed through when the events occur.
*/
export class UniqueSelectionDispatcher {
constructor() {
this._listeners = [];
}
/**
* Notify other items that selection for the given name has been set.
* @param id ID of the item.
* @param name Name of the item.
*/
notify(id, name) {
for (let listener of this._listeners) {
listener(id, name);
}
}
/**
* Listen for future changes to item selection.
* @return Function used to deregister listener
*/
listen(listener) {
this._listeners.push(listener);
return () => {
this._listeners = this._listeners.filter((registered) => {
return listener !== registered;
});
};
}
ngOnDestroy() {
this._listeners = [];
}
}
UniqueSelectionDispatcher.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.2.0", ngImport: i0, type: UniqueSelectionDispatcher, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
UniqueSelectionDispatcher.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.2.0", ngImport: i0, type: UniqueSelectionDispatcher, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.2.0", ngImport: i0, type: UniqueSelectionDispatcher, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}] });
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