Flex中PureMVC學習

來源:互聯網
上載者:User

首先,我會用一個Demo來說明我的學習過程.

 

分析:

 

1.選擇自己需要進入的網站類型;

 

2.如果選擇 Flex,哪麼就需要登陸.

 

以上是我現在Demo的雛形.

 

注:pureMVC我就不講了.不懂的可以去看相關的資料.現在有中文版的資 料.

 

第一步:建立好工程,載入進pureMVC的架構,建立好檔案結構.

 

 

 

 

第一步:

 

首先是註冊相關的通知,為了方便管理,我將 所有的通知均放在一個as檔案中,命名為AppConstance.as

 

代碼如下:

 

 1package myApp

 2{

 3    public class AppConstance

 4    {

 5        public function AppConstance()

 6        {

 7        }

 8        //註冊通知;

 9        public static const START:String = "start";

10        public static const TO_CHOOSE:String = "to_choose";

11        public static const CHOOSE:String = "choose";

12        public static const TO_LOGIN:String = "to_login";

13        public static const LOGIN:String = "login";

14        public static const LOGIN_SUCCESS:String = "login_success";

15        public static const LOGIN_FAILURE:String = "login_failure"

16        public static const TO_WELCOME:String = "to_welcome";

17        public static const WELCOME:String = "welcome";

18

19    }

20}

 

第二步:

 

在PureMVC中Facade只有一個,而且永遠不會 被執行個體化,本程式中Facade命名為:ApplicationFacade.as

 

代碼如下

 

package myApp

{

    import org.puremvc.as3.interfaces.IFacade;

    import org.puremvc.as3.patterns.facade.Facade;

    import myApp.AppConstance;

    import myApp.Controller.startCommand;

 

    public class ApplicationFacade extends Facade implements IFacade

    {

        public function ApplicationFacade()

        {

            super();

        }

 

        

        public static function getInstance():ApplicationFacade{

            if(instance == null){

                instance = new ApplicationFacade();

            }

            return instance as ApplicationFacade;

        }

 

        

        override protected function initializeController():void{

            super.initializeController();

            registerCommand(AppConstance.START,startCommand);

        }

 

        public function start(app:myApp):void{

            sendNotification(AppConstance.START,app,"myweb");

        }

    }

}

 

解釋下:

 

public static function getInstance():ApplicationFacade{

            if(instance == null){

                instance = new ApplicationFacade();

            }

            return instance as ApplicationFacade;

        }

 

這句是獲得ApplicationFacade單列工廠,如果不存在則新建立一個,然後返回一個 ApplicationFacade.

 

override protected function initializeController():void{

            super.initializeController();

            registerCommand(AppConstance.START,startCommand);

        }

 

初始化Controller,並註冊了START這個通知與startCommand的映射,注意,通知必須有相關的 Command,Mediator對應.

 

然後建立開始函數:

 

public function start(app:myApp):void{

            sendNotification(AppConstance.START,app,"myweb");

        }

 

這裡我傳了一個參數:app:myApp,意思是傳的參數app是myApp類型,myApp指主檔案myApp.mxml.

 

到此 ApplicationFacade建立完成,實現了開始函數:start(),單列工廠:getInstance(),還有初始化controller:initializeController();

 

myApp.mxml

 

myApp屬於一個空的Application,在程式開始運行時就需要去執行start();

 

見代 碼:

 

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="intApp()">

    <mx:Script>

        <![CDATA[

            import myApp.ApplicationFacade;

            public function intApp():void{

                var facade:ApplicationFacade = ApplicationFacade.getInstance();

                facade.start(this);

            }

        ]]>

    </mx:Script>

</mx:Application>

 

匯入ApplicationFacade類. 聲明一個函數為intApp()並在頁面載入完成後執行:craationComplete = "intApp()";

 

聲明了一個變數facade,類型是ApplicationFacade,並執行start(),這樣程式就啟動了..

 

第四 步:

 

startCommand:

 

在ApplicationFacade中,我聲明了AppConstance.START,這個通知與startCommand的映射,即,在程式開始執行 時,就需要去執行startCommand

 

代碼:

 

package myApp.Controller

{

    import myApp.AppConstance;

    import myApp.Model.userProxy;

    import myApp.View.chooseMediator;

    import myApp.View.loginMediator;

 

    import org.puremvc.as3.interfaces.ICommand;

    import org.puremvc.as3.interfaces.INotification;

    import org.puremvc.as3.patterns.command.SimpleCommand;

 

    public class startCommand extends SimpleCommand implements ICommand

    {

        public function startCommand()

        {

            super();

        }

 

        override public function execute(notification:INotification):void

        {

            var body:Object = notification.getBody();

            var type:String = notification.getType();

            if(type == "myweb"){

                this.facade.registerCommand(AppConstance.LOGIN,loginCommand);

                this.facade.registerMediator(new chooseMediator(body));

                this.facade.registerMediator(new loginMediator(body));

                this.facade.registerProxy(new userProxy());

 

                this.sendNotification(AppConstance.TO_CHOOSE,body)

 

            }else{

                trace("不是本站");

            }

        }

 

    }

}

 

 

本文來自編程入門網:http://www.bianceng.cn/webkf/Flex/201107/27702_3.htm

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