教你7步实现flex自定义Event及参数传递Flex应用开发过程中如需要灵活的在不同组件（如A与B，父与子）之间响应事件，传递参数等功能时就会使用自定义事件（Event）机制,下面通过一个事例分七步,通过自定义Event和EventDispatcher两种机制实现事件交互和参数传递;事例描述:有一个父亲“parentApp.mxml”有两个儿子“comBrotherA.mxml”和"comBrotherB.mxml",新年降至，两个儿子为表孝心分别给他们老爸存入(事件)一笔过节费(事件参数),并通知老爸我存钱进去了，老爸在收到两个儿子的钱后汇总后同时告诉(事件)两个儿子钱我已收到总数(事件参数)是多少...1、第一步：引入自定义注册事件参数传递扩展类(来自网络)viewplaincopytoclipboardprint?1.packagemyeventhelper2.{3.//自定义注册事件参数传递扩展类4.publicclassEventArgExtend5.{6.publicfunctionEventArgExtend()7.{8.}9.publicstaticfunctioncreate(f:Function,...arg):Function//动态参数创建10.{11.varF:Boolean=false;12.var_f:Function=function(e:*,..._arg)13.{14._arg=arg;15.if(!F)16.{17.F=true;18._arg.unshift(e);19.}20.f.apply(null,_arg);21.};22.return_f;23.}24.publicstaticfunctiontoString():String25.{26.return"ClassJEventDelegate";27.}28.}29.}2、第二步：自定义事件触发类：viewplaincopytoclipboardprint?1.packagemyeventhelper2.{3.importflash.events.EventDispatcher;4.5.importmx.core.UIComponent;6.//自定义事件触发类7.publicclassMyEventDispatcherextendsEventDispatcher8.{9.privatestaticvar_instance:MyEventDispatcher;10.publicstaticconstEXEC_PARENT_METHOD:String="ExecParentMethod";//执行Parent方法11.publicstaticfunctiongetInstance():MyEventDispatcher12.{13.if(_instance==null){14._instance=newMyEventDispatcher();15.}16.return_instance;17.}18.publicvarSource:UIComponent;//事件源对象19.publicvarParsms:Object;//主要用于参数传递20.}21.}3、第三步：用户自定义事件类viewplaincopytoclipboardprint?1.packagemyeventhelper2.{3.importmx.events.FlexEvent;4.//用户自定义事件类5.publicclassMyExtendEventextendsFlexEvent6.{7.publicstaticconstEXEC_BROTHER_METHOD:String="ExecBrotherMethod";//执行兄弟方法8.9.publicvarparam:Object;10.publicfunctionMyExtendEvent(o:Object,type:String,bubbles:Boolean=false,cancelable:Boolean=false)11.{12.super(type,bubbles,cancelable);13.this.param=o;//也可通过这样的方式传递参数14.}15.}16.}4、第四步：完成儿子A“comBrotherA.mxml”：viewplaincopytoclipboardprint?1.<?xmlversion="1.0"encoding="utf-8"?>2.<mx:Panelxmlns:mx="wwadobe/2006/mxml"width="222"height="170"title="组件A"creationComplete="init()">3.<mx:Script>4.<!--[CDATA[5.importmyeventhelper.MyExtendEvent;6.importmyeventhelper.MyEventDispatcher;7.importmyeventhelper.EventArgExtend;8.privatevarexecParent:MyEventDispatcher;//触发父亲节点事件9.functioninit():void10.{11.execParent=MyEventDispatcher.getInstance();12.}13.publicfunctiononGetParentTotal(e:MyExtendEvent,...agrs):void14.{15.//下面两种方法都可以用来传递参数16.//this.labTotal.text=String(agrs[0].totalValue);17.this.labTotal.text=e.param.toString();18.}19.publicfunctiononParentEvent(event:Event):void20.{21.execParent.Parsms=txtValue.text;22.execParent.Source=this;23.execParent.dispatchEvent(newEvent(MyEventDispatcher.EXEC_PARENT_METHOD));24.}25.26.]]-->27.</mx:Script>28.<mx:Canvasheight="90"width="197">29.<mx:TextInputwidth="92"y="10"x="85"id="txtValue"/>30.<mx:Labelx="13"y="12"text="存入："/>31.<mx:Labelx="87"y="56"width="90"id="labTotal"/>32.<mx:Labelx="5"y="56"text="ParentTotal:"/>33.</mx:Canvas>34.<mx:ControlBar>35.<mx:Buttonlabel="调用父方法"id="btnExecParent"click="onParent...