Ulydev / lem

An event manager for LÖVE

lem

lem is a simple event manager library that allows you to register and trigger events in your game / application.

It works the same way as NodeJS's EventEmitter.

Setup

local event = require "lem" --require the library

Usage

Create an event manager

local myEventManager = event:new()

Register an event listener

myEventManager:on('start', function ()
  print("Starting game")
end)

Emit an event

myEventManager:emit('start')

You can also pass parameters in a table:

myEventManager:on('say', function (params)
  print(params.message)
end)

myEventManager:emit('say', { message = "Hi!" })

Chaining functions

The event manager object is passed through most of the methods. This allows you to chain function calls like so:

manager = event
:new()
:on('event1', function () print("event 1") end)
:on('event2', function () print("event 2") end)

Methods and aliases

Register an event listener

lem:on(eventname, callback)
//-> lem:addEventListener

Emit an event

lem:emit(eventname, params)

Remove an event listener

lem:remove(eventname, callback)
//-> lem:removeEventListener

Remove all listeners of a specific event

lem:reset(eventname)
//-> lem:removeEventListeners

Get total count of listeners

lem:getListenerCount(eventname)