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EventDispatcher = {}
EventDispatcher.__index = EventDispatcher
function EventDispatcher.new()
local self = setmetatable({}, EventDispatcher)
self.listeners = {}
return self
end
function EventDispatcher:addEventListener(eventName, callback)
if not self.listeners[eventName] then
self.listeners[eventName] = {}
end
table.insert(self.listeners[eventName], callback)
end
function EventDispatcher:removeEventListener(eventName, callback)
local eventListeners = self.listeners[eventName]
if eventListeners then
for i = #eventListeners, 1, -1 do
if eventListeners[i] == callback then
table.remove(eventListeners, i)
break
end
end
end
end
function EventDispatcher:dispatchEvent(eventName, ...)
local eventListeners = self.listeners[eventName]
if eventListeners then
for i = 1, #eventListeners do
eventListeners[i](...)
end
end
end
local dispatcher = EventDispatcher.new()
local callbackFunction = function(param1, param2)
print(param1, param2)
end
dispatcher:removeEventListener("eventName", callbackFunction)
dispatcher:addEventListener("eventName", callbackFunction)
dispatcher:dispatchEvent("eventName", "hello1", "world")
dispatcher:removeEventListener("eventName", callbackFunction)
dispatcher:dispatchEvent("eventName", "wang2", "world")
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