[cocos2dx_lua]Lua版自定义事件分发系统

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--事件系统----------------------------------local EventSystem = class("EventSystem")function EventSystem:ctor()    self._eventBus = {}end-- _eventBus[eventName][tag] = listenerfunction EventSystem:regEvent(eventName,listener,tag)    print(eventName,listener,tag)    if type(eventName) == "string" and type(listener) == "function" then        if not self._eventBus[eventName] then self._eventBus[eventName] = {} end        tag = tag .. ''        self._eventBus[eventName][tag] = listener        printf("[[通知中心 %s 注册 %s 成功! ]]", eventName, tag)    else        printf("[[通知中心 %s 注册 %s 失败! ]]", tostring(eventName),tag .. '')    endendfunction EventSystem:postEvent(eventName,data)    assert(eventName, "EventSystem:postEvent eventName = nil")    local target = self._eventBus[eventName]    if not target then printf("[[通知中心 %s 不存在! ]]", eventName) return end    local event = { eventName = eventName, tag = nil, data = data }    if target then        for _tag,v in pairs(target) do            printf("[[通知中心 向 %s 发送 %s 成功! ]]", _tag, event.eventName)            event.tag = _tag            v( event )        end    endendfunction EventSystem:unRegEvent(eventName,tag)    if self._eventBus[eventName] then        tag = tag .. ''        self._eventBus[eventName][tag] = nil        printf("[[通知中心 %s 注销 %s 成功! ]]", eventName, tag)    else        printf("[[通知中心 %s 注销 %s 失败! ]]", eventName, tag)    endendfunction EventSystem:unRegEventByName(eventName)    if self._eventBus[eventName] then        self._eventBus[eventName] = nil        printf("[[通知中心 %s 注销成功! ]]", eventName)    else        printf("[[通知中心 %s 注销失败! ]]", eventName)    endendfunction EventSystem:hasEventListenerByName(eventName)    local t = self._eventBus[eventName]    if not t then return false end    for _,__ in pairs(t) do        return true    end    return falseendfunction EventSystem:hasEventListener(eventName,tag)    return (not self._eventBus[eventName][tag .. ''])endfunction EventSystem:removeAllEventListeners()    self._eventBus = {}endfunction EventSystem:dumpAllEventListeners()    print("---- EventSystem:dumpAllEventListeners() ----begin")    for name, listeners in pairs(self._eventBus) do        printf("-- event: %s", name)        for tag, listener in pairs(listeners) do            printf("--     tag: %s, listener: %s", tostring(tag), tostring(listener))        end    end    print("---- EventSystem:dumpAllEventListeners() ----end")endreturn EventSystem
[设计模式]Observer观察者模式
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