@angular/cdk
Version:
Angular Material Component Development Kit
50 lines (47 loc) • 1.97 kB
JavaScript
import * as i0 from '@angular/core';
import { Injectable } 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.
*/
class UniqueSelectionDispatcher {
_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 = [];
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "19.2.0", ngImport: i0, type: UniqueSelectionDispatcher, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "19.2.0", ngImport: i0, type: UniqueSelectionDispatcher, providedIn: 'root' });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "19.2.0", ngImport: i0, type: UniqueSelectionDispatcher, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}] });
export { UniqueSelectionDispatcher as U };
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