lazy-widgets/dist/helpers/Notifier.js

Typescript retained mode GUI for the HTML canvas API

import { ConcurrentCollection } from './ConcurrentCollection.js';
/**
 * A base class that can be listened to, and dispatch events.
 *
 * @category Helper
 */
export class Notifier {
    constructor() {
        this.listeners = new ConcurrentCollection();
    }
    /** Listen to events from this helper. Duplicate listeners allowed. */
    addEventListener(listener) {
        this.listeners.add(listener);
    }
    /**
     * Stop listening to events from this helper. If a duplicate listener is
     * removed, only one is removed.
     *
     * @returns True if a listener was removed, false otherwise.
     */
    removeEventListener(listener) {
        return this.listeners.removeByValue(listener);
    }
    /**
     * Dispatch an event to a specific listener. Listener does not have to be
     * added
     */
    dispatchToListener(event, listener) {
        try {
            listener(event);
        }
        catch (err) {
            console.error(err);
        }
    }
    /** Dispatch an event to all listeners. */
    dispatchEvent(event) {
        this.listeners.forEach(this.dispatchToListener.bind(this, event));
    }
}
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