Created
February 6, 2019 18:56
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A simple way to deal with events (no event deleting yet)
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| /** | |
| * The EventManager deals with events, create them, call them. | |
| * This class is mostly for being inherited from. | |
| */ | |
| class EventManager { | |
| /** | |
| * Constructor | |
| */ | |
| constructor() { | |
| this._events = {} | |
| } | |
| /** | |
| * Define an event, with a name associated with a function | |
| * @param {String} eventName - Name to give to the event | |
| * @param {Function} callback - function associated to the even | |
| */ | |
| on(eventName, callback) { | |
| if (typeof callback === 'function') { | |
| if (!(eventName in this._events)) { | |
| this._events[eventName] = [] | |
| } | |
| this._events[eventName].push(callback) | |
| } else { | |
| console.warn('The callback must be of type Function') | |
| } | |
| } | |
| emit(eventName, args = []) { | |
| // the event must exist and be non null | |
| if ((eventName in this._events) && (this._events[eventName].length > 0)) { | |
| const events = this._events[eventName] | |
| for (let i = 0; i < events.length; i += 1) { | |
| events[i](...args) | |
| } | |
| } else { | |
| console.warn(`No function associated to the event ${eventName}`) | |
| } | |
| } | |
| } | |
| export default EventManager |
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