tlojs/lib/events/event.js

The Last One - The last npm package you'll need to install

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BaseEvent = exports.GlobalEventHub = exports.EventHub = void 0;
var EventHub = /** @class */ (function () {
    function EventHub() {
        this.registered = {};
    }
    /**
     * Dispatches a an event to any listeners. If no listeners exist, the event will be ignored
     * @param event EventBase
     */
    EventHub.prototype.dispatch = function (event) {
        var callbacks = this.registered[event.name];
        if (callbacks) {
            for (var i = 0; i < callbacks.length; i++) {
                var callback = callbacks[i];
                try {
                    callback(event);
                }
                catch (ex) {
                    console.error("Unable to dispatch " + event.name + " because " + ex, ex);
                }
            }
        }
    };
    /**
     * Register a callback to an event type
     * @param eventType
     * @param callback
     * @returns
     */
    EventHub.prototype.register = function (eventType, callback) {
        var instance = new eventType();
        var name = instance.name;
        if (!this.registered[name]) {
            this.registered[name] = [];
        }
        this.registered[name].push(callback);
        return new EventRegistration(eventType, callback, this);
    };
    /**
     * Unregister a callback from an event type
     * @param eventType
     * @param callback
     * @returns
     */
    EventHub.prototype.unregister = function (eventType, callback) {
        var instance = new eventType();
        var name = instance.name;
        if (!this.registered[name]) {
            return;
        }
        var foundIndex = this.registered[name].indexOf(callback);
        if (foundIndex > -1) {
            this.registered[name].splice(foundIndex, 1);
        }
    };
    return EventHub;
}());
exports.EventHub = EventHub;
/**
 * The global event hub
 */
exports.GlobalEventHub = new EventHub();
var BaseEvent = /** @class */ (function () {
    function BaseEvent(data) {
        this.data = data;
        this.globalHub = exports.GlobalEventHub;
    }
    /**
     * Any inherited class can easily dispatch to the global event hub
     */
    BaseEvent.prototype.dispatch = function () {
        this.globalHub.dispatch(this);
    };
    return BaseEvent;
}());
exports.BaseEvent = BaseEvent;
var EventRegistration = /** @class */ (function () {
    function EventRegistration(eventType, callback, eventHub) {
        this.eventType = eventType;
        this.callback = callback;
        this.eventHub = eventHub;
    }
    /**
     * Easy shortcut to unregister an event
     */
    EventRegistration.prototype.unsubscribe = function () {
        this.eventHub.unregister(this.eventType, this.callback);
    };
    return EventRegistration;
}());