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  • Flex 开发架构(三): MVC框架－Flex Cairngorm

    使用Cairngorm的第一步是建立框架结构的骨架，包括了三个对象：

    Model Locater；

    Service Locator；

    Front Controller；

    Model Locator：承载了组件之间的所有的传递的信息和数据，这是一个Bindable（可绑定的）对象。

    Service Locator：定义了与数据源（Httpservice，Webservice，Remoteobject）之间通讯的界面。

    Front Controller：建立播送事件（Dispatch event）和命令层（command）之间的对应关系（mapping）。  

    看一下相关的代码：

    BuddyAppModelLocator.as:

    Xml代码
    1. <EM>package com.ny.flex.cairngorm.model   
    2. {   
    3.       import com.ny.flex.cairngorm.vo.User;   
    4.          
    5.       import mx.collections.ArrayCollection;   
    6.          
    7.       [Bindable]   
    8.       public class BuddyAppModelLocator   
    9.       {   
    10.             public var buddyList:ArrayCollection=new ArrayCollection();   
    11.             public var loginUser:User=new User();   
    12.             public var viewStackSelectedIndex :int = 0;   
    13.                
    14.             static private var __instance:BuddyAppModelLocator=null;   
    15.                
    16.             static public function getInstance():BuddyAppModelLocator   
    17.             {   
    18.                   if(__instance == null)   
    19.                   {   
    20.                         __instance=new BuddyAppModelLocator();   
    21.                   }   
    22.                   return __instance;   
    23.             }   
    24.       }   
    25. }   
    26. </EM>  
    [xml] view plaincopyprint?
    1. <EM>package com.ny.flex.cairngorm.model  
    2. {  
    3.       import com.ny.flex.cairngorm.vo.User;  
    4.         
    5.       import mx.collections.ArrayCollection;  
    6.         
    7.       [Bindable]  
    8.       public class BuddyAppModelLocator  
    9.       {  
    10.             public var buddyList:ArrayCollection=new ArrayCollection();  
    11.             public var loginUser:User=new User();  
    12.             public var viewStackSelectedIndex :int = 0;  
    13.               
    14.             static private var __instance:BuddyAppModelLocator=null;  
    15.               
    16.             static public function getInstance():BuddyAppModelLocator  
    17.             {  
    18.                   if(__instance == null)  
    19.                   {  
    20.                         __instance=new BuddyAppModelLocator();  
    21.                   }  
    22.                   return __instance;  
    23.             }  
    24.       }  
    25. }  
    26. </EM>  
    package com.ny.flex.cairngorm.model
{
      import com.ny.flex.cairngorm.vo.User;
      
      import mx.collections.ArrayCollection;
      
      [Bindable]
      public class BuddyAppModelLocator
      {
            public var buddyList:ArrayCollection=new ArrayCollection();
            public var loginUser:User=new User();
            public var viewStackSelectedIndex :int = 0;
            
            static private var __instance:BuddyAppModelLocator=null;
            
            static public function getInstance():BuddyAppModelLocator
            {
                  if(__instance == null)
                  {
                        __instance=new BuddyAppModelLocator();
                  }
                  return __instance;
            }
      }
}

     

     

    在Model Locator代码中，定义了三个public的变量，buddyList：用来存放由数据库获取的密友列表；loginUser：定义一个User类型对象；viewStackSelectedIndex：定义viewStack指向的视窗。

    几乎所有的服务层返回的信息都需要在Model Locator中有一个相应的对象。

     

     

    BuddyServiceLocator.mxml:

    Xml代码
    1. <EM><EM><?xml version=”1.0″ encoding=”utf-8″?>  
    2. <cairngorm:ServiceLocator xmlns:mx=”http://www.adobe.com/2006/mxml” xmlns:cairngorm=”http://www.adobe.com/2006/cairngorm“>  
    3.       <mx:RemoteObject id=”buddyRo“  destination=”flexmvcRO” >  
    4.                
    5.       </mx:RemoteObject>  
    6. </cairngorm:ServiceLocator>  
    7. </EM></EM>  
    [xml] view plaincopyprint?
    1. <EM><EM><?xml version=”1.0″ encoding=”utf-8″?>  
    2. <cairngorm:ServiceLocator xmlns:mx=”http://www.adobe.com/2006/mxml” xmlns:cairngorm=”http://www.adobe.com/2006/cairngorm“>  
    3.       <mx:RemoteObject id=”buddyRo“  destination=”flexmvcRO” >  
    4.               
    5.       </mx:RemoteObject>  
    6. </cairngorm:ServiceLocator>  
    7. </EM></EM>  
    <?xml version=”1.0″ encoding=”utf-8″?>
<cairngorm:ServiceLocator xmlns:mx=”http://www.adobe.com/2006/mxml” xmlns:cairngorm=”http://www.adobe.com/2006/cairngorm“>
      <mx:RemoteObject id=”buddyRo“  destination=”flexmvcRO” >
            
      </mx:RemoteObject>
</cairngorm:ServiceLocator>

     

     

    上述代码定义了程序将要调用的RemoteObject ，RemoteObject 所调用的Destination需要和remote_config.xml文件中的Destination相一致。在此，Destination的值为“flexmvcRO”。

    BuddyListController.as:

     

     

    Xml代码
    1. <EM><EM><STRONG>package com.ny.flex.cairngorm.control   
    2. {   
    3.       import com.adobe.cairngorm.control.FrontController;   
    4.       import com.ny.flex.cairngorm.command.GetBuddyListCommand;   
    5.       import com.ny.flex.cairngorm.command.LoginCommand;   
    6.       import com.ny.flex.cairngorm.event.GetBuddyListEvent;   
    7.       import com.ny.flex.cairngorm.event.LoginEvent;   
    8.     
    9.       public class BuddyListController extends FrontController   
    10.       {   
    11.             public function BuddyListController()   
    12.             {   
    13.                   super();   
    14.                   addCommand(LoginEvent.LOGIN_EVENT,LoginCommand);         
    15.                   addCommand(GetBuddyListEvent.GET_BUDDY_LIST_EVENT,   
    16. GetBuddyListCommand);   
    17.             }   
    18.                
    19.       }   
    20. }   
    21. </STRONG></EM></EM>  
    [xml] view plaincopyprint?
    1. <EM><EM><STRONG>package com.ny.flex.cairngorm.control  
    2. {  
    3.       import com.adobe.cairngorm.control.FrontController;  
    4.       import com.ny.flex.cairngorm.command.GetBuddyListCommand;  
    5.       import com.ny.flex.cairngorm.command.LoginCommand;  
    6.       import com.ny.flex.cairngorm.event.GetBuddyListEvent;  
    7.       import com.ny.flex.cairngorm.event.LoginEvent;  
    8.    
    9.       public class BuddyListController extends FrontController  
    10.       {  
    11.             public function BuddyListController()  
    12.             {  
    13.                   super();  
    14.                   addCommand(LoginEvent.LOGIN_EVENT,LoginCommand);        
    15.                   addCommand(GetBuddyListEvent.GET_BUDDY_LIST_EVENT,  
    16. GetBuddyListCommand);  
    17.             }  
    18.               
    19.       }  
    20. }  
    21. </STRONG></EM></EM>  
    package com.ny.flex.cairngorm.control
{
      import com.adobe.cairngorm.control.FrontController;
      import com.ny.flex.cairngorm.command.GetBuddyListCommand;
      import com.ny.flex.cairngorm.command.LoginCommand;
      import com.ny.flex.cairngorm.event.GetBuddyListEvent;
      import com.ny.flex.cairngorm.event.LoginEvent;
 
      public class BuddyListController extends FrontController
      {
            public function BuddyListController()
            {
                  super();
                  addCommand(LoginEvent.LOGIN_EVENT,LoginCommand);      
                  addCommand(GetBuddyListEvent.GET_BUDDY_LIST_EVENT,
GetBuddyListCommand);
            }
            
      }
}

     

    很显然，上述的Controller代码是事件和命令的对应处理的地方。

     

    如何能将这些乱七八糟的东西结合在一起？其Magic的地方是在主页（Main application）上，代码如下：

    BuddList_Main_Cairngorm.mxml:

    Xml代码
    1. <EM><EM><STRONG><?xml version=”1.0″ encoding=”utf-8″?>  
    2. <mx:Application xmlns:mx=”http://www.adobe.com/2006/mxml“  xmlns:service=”com.ny.flex.cairngorm.service.*“  xmlns:controller=”com.ny.flex.cairngorm.control.*” xmlns:views=”com.ny.flex.cairngorm.views.*” layout=”absolute“  width=”100%” height=”100%“>  
    3. <mx:Script>  
    4.       <![CDATA[  
    5.             import com.ny.flex.cairngorm.model.BuddyAppModelLocator;  
    6.       [Bindable]  
    7.       public var myModel:BuddyAppModelLocator = BuddyAppModelLocator.getInstance();  
    8.       ]]>  
    9. </mx:Script>  
    10.     
    11.       <service:BuddyServiceLocator id=”myservice“/>  
    12.       <controller:BuddyListController id=”myController“/>  
    13.     
    14.     <mx:HBox  horizontalAlign=”center” verticalAlign=”top“  width=”100%” height=”100%” y=”0” x=”0“>  
    15.     <mx:ViewStack id=”viewStack“  resizeToContent=”true” selectedIndex=”{myModel.viewStackSelectedIndex}” >  
    16.         <views:LoginView  />  
    17.         <views:BuddyListView/>  
    18.     </mx:ViewStack>  
    19.     </mx:HBox>  
    20. </mx:Application>  
    21. </STRONG></EM></EM>  
    [xml] view plaincopyprint?
    1. <EM><EM><STRONG><?xml version=”1.0″ encoding=”utf-8″?>  
    2. <mx:Application xmlns:mx=”http://www.adobe.com/2006/mxml“  xmlns:service=”com.ny.flex.cairngorm.service.*“  xmlns:controller=”com.ny.flex.cairngorm.control.*” xmlns:views=”com.ny.flex.cairngorm.views.*” layout=”absolute“  width=”100%” height=”100%“>  
    3. <mx:Script>  
    4.       <![CDATA[ 
    5.             import com.ny.flex.cairngorm.model.BuddyAppModelLocator; 
    6.       [Bindable] 
    7.       public var myModel:BuddyAppModelLocator = BuddyAppModelLocator.getInstance(); 
    8.       ]]>  
    9. </mx:Script>  
    10.    
    11.       <service:BuddyServiceLocator id=”myservice“/>  
    12.       <controller:BuddyListController id=”myController“/>  
    13.    
    14.     <mx:HBox  horizontalAlign=”center” verticalAlign=”top“  width=”100%” height=”100%” y=”0” x=”0“>  
    15.     <mx:ViewStack id=”viewStack“  resizeToContent=”true” selectedIndex=”{myModel.viewStackSelectedIndex}” >  
    16.         <views:LoginView  />  
    17.         <views:BuddyListView/>  
    18.     </mx:ViewStack>  
    19.     </mx:HBox>  
    20. </mx:Application>  
    21. </STRONG></EM></EM>  
    <?xml version=”1.0″ encoding=”utf-8″?>
<mx:Application xmlns:mx=”http://www.adobe.com/2006/mxml“  xmlns:service=”com.ny.flex.cairngorm.service.*“  xmlns:controller=”com.ny.flex.cairngorm.control.*” xmlns:views=”com.ny.flex.cairngorm.views.*” layout=”absolute“  width=”100%” height=”100%“>
<mx:Script>
      <![CDATA[
            import com.ny.flex.cairngorm.model.BuddyAppModelLocator;
      [Bindable]
      public var myModel:BuddyAppModelLocator = BuddyAppModelLocator.getInstance();
      ]]>
</mx:Script>
 
      <service:BuddyServiceLocator id=”myservice“/>
      <controller:BuddyListController id=”myController“/>
 
    <mx:HBox  horizontalAlign=”center” verticalAlign=”top“  width=”100%” height=”100%” y=”0” x=”0“>
    <mx:ViewStack id=”viewStack“  resizeToContent=”true” selectedIndex=”{myModel.viewStackSelectedIndex}” >
        <views:LoginView  />
        <views:BuddyListView/>
    </mx:ViewStack>
    </mx:HBox>
</mx:Application>

     

     

    现在用户可以建立视图组件，并从这些组件中播送事件:

     

    LoginView.mxml:

    Xml代码
    1. <EM><EM><STRONG><EM>      <![CDATA[  
    2.             import com.ny.flex.cairngorm.event.LoginEvent;  
    3.             import com.ny.flex.cairngorm.vo.User;  
    4.             import mx.validators.Validator;  
    5.             private function login():void{  
    6.                   if(Validator.validateAll(validators).length == 0){  
    7.                         var loginUser:User = new User();  
    8.                         loginUser.userName=username.text;  
    9.                         loginUser.password=password.text;  
    10.                         var loginEvent:LoginEvent = new LoginEvent();  
    11.                         loginEvent.loginUser = loginUser;  
    12.                         loginEvent.dispatch();  
    13.                   }     
    14.             }  
    15.       ]]>  
    16. </mx:Script>  
    17.     
    18.  <!–  Validators–>  
    19.  <mx:Array id=”validators“>  
    20.     <mx:StringValidator  id=”userNameValidator” source=”{username}“  property=”text“  required=”true“/>  
    21.     <mx:StringValidator  id=”passwordValidator” source=”{password}“  property=”text” required=”true” />  
    22.  </mx:Array>       
    23.     
    24.     
    25. <mx:Form id=”loginForm” x=”0” y=”0“>  
    26.           <mx:FormItem label=”Username:” >  
    27.                <mx:TextInput id=”username” />  
    28.            </mx:FormItem>  
    29.            <mx:FormItem label=”Password:” >  
    30.                <mx:TextInput id=”password” displayAsPassword=”true” />  
    31.            </mx:FormItem>  
    32.            <mx:FormItem direction=”horizontal” verticalGap=”15” paddingTop=”5” width=”170“>  
    33.                <mx:Button id=”loginBtn” label=”Login” click=”login()”/>  
    34.            </mx:FormItem>  
    35.     </mx:Form>  
    36.          
    37. </mx:Panel>  
    38. </EM></STRONG></EM></EM>  
    [xml] view plaincopyprint?
    1. <EM><EM><STRONG><EM>      <![CDATA[ 
    2.             import com.ny.flex.cairngorm.event.LoginEvent; 
    3.             import com.ny.flex.cairngorm.vo.User; 
    4.             import mx.validators.Validator; 
    5.             private function login():void{ 
    6.                   if(Validator.validateAll(validators).length == 0){ 
    7.                         var loginUser:User = new User(); 
    8.                         loginUser.userName=username.text; 
    9.                         loginUser.password=password.text; 
    10.                         var loginEvent:LoginEvent = new LoginEvent(); 
    11.                         loginEvent.loginUser = loginUser; 
    12.                         loginEvent.dispatch(); 
    13.                   }    
    14.             } 
    15.       ]]>  
    16. </mx:Script>  
    17.    
    18.  <!–  Validators–>  
    19.  <mx:Array id=”validators“>  
    20.     <mx:StringValidator  id=”userNameValidator” source=”{username}“  property=”text“  required=”true“/>  
    21.     <mx:StringValidator  id=”passwordValidator” source=”{password}“  property=”text” required=”true” />  
    22.  </mx:Array>      
    23.    
    24.    
    25. <mx:Form id=”loginForm” x=”0” y=”0“>  
    26.           <mx:FormItem label=”Username:” >  
    27.                <mx:TextInput id=”username” />  
    28.            </mx:FormItem>  
    29.            <mx:FormItem label=”Password:” >  
    30.                <mx:TextInput id=”password” displayAsPassword=”true” />  
    31.            </mx:FormItem>  
    32.            <mx:FormItem direction=”horizontal” verticalGap=”15” paddingTop=”5” width=”170“>  
    33.                <mx:Button id=”loginBtn” label=”Login” click=”login()”/>  
    34.            </mx:FormItem>  
    35.     </mx:Form>  
    36.         
    37. </mx:Panel>  
    38. </EM></STRONG></EM></EM>  
          <![CDATA[
            import com.ny.flex.cairngorm.event.LoginEvent;
            import com.ny.flex.cairngorm.vo.User;
            import mx.validators.Validator;
            private function login():void{
                  if(Validator.validateAll(validators).length == 0){
                        var loginUser:User = new User();
                        loginUser.userName=username.text;
                        loginUser.password=password.text;
                        var loginEvent:LoginEvent = new LoginEvent();
                        loginEvent.loginUser = loginUser;
                        loginEvent.dispatch();
                  }   
            }
      ]]>
</mx:Script>
 
 <!–  Validators–>
 <mx:Array id=”validators“>
    <mx:StringValidator  id=”userNameValidator” source=”{username}“  property=”text“  required=”true“/>
    <mx:StringValidator  id=”passwordValidator” source=”{password}“  property=”text” required=”true” />
 </mx:Array>    
 
 
<mx:Form id=”loginForm” x=”0” y=”0“>
          <mx:FormItem label=”Username:” >
               <mx:TextInput id=”username” />
           </mx:FormItem>
           <mx:FormItem label=”Password:” >
               <mx:TextInput id=”password” displayAsPassword=”true” />
           </mx:FormItem>
           <mx:FormItem direction=”horizontal” verticalGap=”15” paddingTop=”5” width=”170“>
               <mx:Button id=”loginBtn” label=”Login” click=”login()”/>
           </mx:FormItem>
    </mx:Form>
      
</mx:Panel>

     

     

    每一个动作都需要建立一个相应的事件：

     

     

     

     

    LoginEvent.as:

    Xml代码
    1. <EM><EM><STRONG><EM>package com.ny.flex.cairngorm.event   
    2. {   
    3.       import com.adobe.cairngorm.control.CairngormEvent;   
    4.       import com.ny.flex.cairngorm.vo.User;   
    5.          
    6.       import flash.events.Event;   
    7.     
    8.       public class LoginEvent extends CairngormEvent   
    9.       {   
    10.             public static var LOGIN_EVENT:String = “loginEvent”   
    11.             public  var  loginUser:User ;   
    12.                
    13.             public function LoginEvent()   
    14.             {   
    15.                   super(LOGIN_EVENT);   
    16.             }   
    17.     
    18.             override public function clone() : Event   
    19.             {   
    20.                   return new LoginEvent();   
    21.             }   
    22.       }   
    23. }   
    24. </EM></STRONG></EM></EM>  
    [xml] view plaincopyprint?
    1. <EM><EM><STRONG><EM>package com.ny.flex.cairngorm.event  
    2. {  
    3.       import com.adobe.cairngorm.control.CairngormEvent;  
    4.       import com.ny.flex.cairngorm.vo.User;  
    5.         
    6.       import flash.events.Event;  
    7.    
    8.       public class LoginEvent extends CairngormEvent  
    9.       {  
    10.             public static var LOGIN_EVENT:String = “loginEvent”  
    11.             public  var  loginUser:User ;  
    12.               
    13.             public function LoginEvent()  
    14.             {  
    15.                   super(LOGIN_EVENT);  
    16.             }  
    17.    
    18.             override public function clone() : Event  
    19.             {  
    20.                   return new LoginEvent();  
    21.             }  
    22.       }  
    23. }  
    24. </EM></STRONG></EM></EM>  
    package com.ny.flex.cairngorm.event
{
      import com.adobe.cairngorm.control.CairngormEvent;
      import com.ny.flex.cairngorm.vo.User;
      
      import flash.events.Event;
 
      public class LoginEvent extends CairngormEvent
      {
            public static var LOGIN_EVENT:String = “loginEvent”
            public  var  loginUser:User ;
            
            public function LoginEvent()
            {
                  super(LOGIN_EVENT);
            }
 
            override public function clone() : Event
            {
                  return new LoginEvent();
            }
      }
}

     

     

    每一个事件都要对应于一个命令：

    LoginCommand.as:

    Xml代码
    1. <EM><EM><STRONG>package com.ny.flex.cairngorm.command   
    2. {   
    3.       import com.adobe.cairngorm.commands.ICommand;   
    4.       import com.adobe.cairngorm.control.CairngormEvent;   
    5.       import com.ny.flex.cairngorm.event.LoginEvent;   
    6.       import com.ny.flex.cairngorm.model.BuddyAppModelLocator;   
    7.       import com.ny.flex.cairngorm.service.LoginDelegate;   
    8.       import com.ny.flex.cairngorm.vo.User;   
    9.          
    10.       import mx.controls.Alert;   
    11.       import mx.rpc.IResponder;   
    12.     
    13.       public class LoginCommand implements ICommand, IResponder   
    14.       {   
    15.             public function LoginCommand()   
    16.             {   
    17.             }   
    18.     
    19.             public function execute(event:CairngormEvent):void   
    20.             {   
    21.                   var loginEvent:LoginEvent = LoginEvent(event);   
    22.                   var user:User = loginEvent.loginUser;   
    23.                   var lgoinService :LoginDelegate    
    24. =  new LoginDelegate(this);   
    25.                   lgoinService.authenticate(user);   
    26.             }   
    27.                
    28.             public function result(event:Object):void   
    29.             {   
    30.                   var authUser:User = User(event.result);   
    31.                   BuddyAppModelLocator.getInstance().loginUser = authUser;   
    32.                   BuddyAppModelLocator.getInstance().viewStackSelectedIndex=1;   
    33.             }   
    34.                
    35.             public function fault(info:Object):void   
    36.             {   
    37.                   Alert.show(“Login Fail Error “);   
    38.             }   
    39.                
    40.       }   
    41. }   
    42. </STRONG></EM></EM>  
    [xml] view plaincopyprint?
    1. <EM><EM><STRONG>package com.ny.flex.cairngorm.command  
    2. {  
    3.       import com.adobe.cairngorm.commands.ICommand;  
    4.       import com.adobe.cairngorm.control.CairngormEvent;  
    5.       import com.ny.flex.cairngorm.event.LoginEvent;  
    6.       import com.ny.flex.cairngorm.model.BuddyAppModelLocator;  
    7.       import com.ny.flex.cairngorm.service.LoginDelegate;  
    8.       import com.ny.flex.cairngorm.vo.User;  
    9.         
    10.       import mx.controls.Alert;  
    11.       import mx.rpc.IResponder;  
    12.    
    13.       public class LoginCommand implements ICommand, IResponder  
    14.       {  
    15.             public function LoginCommand()  
    16.             {  
    17.             }  
    18.    
    19.             public function execute(event:CairngormEvent):void  
    20.             {  
    21.                   var loginEvent:LoginEvent = LoginEvent(event);  
    22.                   var user:User = loginEvent.loginUser;  
    23.                   var lgoinService :LoginDelegate   
    24. =  new LoginDelegate(this);  
    25.                   lgoinService.authenticate(user);  
    26.             }  
    27.               
    28.             public function result(event:Object):void  
    29.             {  
    30.                   var authUser:User = User(event.result);  
    31.                   BuddyAppModelLocator.getInstance().loginUser = authUser;  
    32.                   BuddyAppModelLocator.getInstance().viewStackSelectedIndex=1;  
    33.             }  
    34.               
    35.             public function fault(info:Object):void  
    36.             {  
    37.                   Alert.show(“Login Fail Error “);  
    38.             }  
    39.               
    40.       }  
    41. }  
    42. </STRONG></EM></EM>  
    package com.ny.flex.cairngorm.command
{
      import com.adobe.cairngorm.commands.ICommand;
      import com.adobe.cairngorm.control.CairngormEvent;
      import com.ny.flex.cairngorm.event.LoginEvent;
      import com.ny.flex.cairngorm.model.BuddyAppModelLocator;
      import com.ny.flex.cairngorm.service.LoginDelegate;
      import com.ny.flex.cairngorm.vo.User;
      
      import mx.controls.Alert;
      import mx.rpc.IResponder;
 
      public class LoginCommand implements ICommand, IResponder
      {
            public function LoginCommand()
            {
            }
 
            public function execute(event:CairngormEvent):void
            {
                  var loginEvent:LoginEvent = LoginEvent(event);
                  var user:User = loginEvent.loginUser;
                  var lgoinService :LoginDelegate 
=  new LoginDelegate(this);
                  lgoinService.authenticate(user);
            }
            
            public function result(event:Object):void
            {
                  var authUser:User = User(event.result);
                  BuddyAppModelLocator.getInstance().loginUser = authUser;
                  BuddyAppModelLocator.getInstance().viewStackSelectedIndex=1;
            }
            
            public function fault(info:Object):void
            {
                  Alert.show(“Login Fail Error “);
            }
            
      }
}

     

     

     

     

     

     

    然后，在Front Controller（前端控制器）中build对应关系：

     

     addCommand(LoginEvent.LOGIN_EVENT,LoginCommand);

     

    命令层需要完成商务逻辑，用户需要在执行方法中加入商务逻辑代码：

     

    Xml代码
    1. <EM><EM><STRONG>                  var lgoinService :LoginDelegate =     
    2.                                             new LoginDelegate(this);   
    3.                   lgoinService.authenticate(user);   
    4. </STRONG></EM></EM>  
    [xml] view plaincopyprint?
    1. <EM><EM><STRONG>                  var lgoinService :LoginDelegate =    
    2.                                             new LoginDelegate(this);  
    3.                   lgoinService.authenticate(user);  
    4. </STRONG></EM></EM>  
                      var lgoinService :LoginDelegate =  
                                            new LoginDelegate(this);
                  lgoinService.authenticate(user);

     

    Delegate（代表）用来通过服务层（Service Locator）调用数据源：

     

    LoginDelegate.as:

    Xml代码
    1. <EM><EM><STRONG><EM>package com.ny.flex.cairngorm.service   
    2. {   
    3.       import com.adobe.cairngorm.business.ServiceLocator;   
    4.       import com.ny.flex.cairngorm.vo.User;   
    5.          
    6.       import mx.rpc.IResponder;   
    7.          
    8.       public class LoginDelegate   
    9.       {   
    10.             private var responder:IResponder;   
    11.             private var service:Object;   
    12.                
    13.             public function LoginDelegate(responder :IResponder){   
    14.               this.service =    
    15.                            ServiceLocator.getInstance()   
    16.                                         .getRemoteObject(“buddyRo”);   
    17.               this.responder = responder;   
    18.             }   
    19.                
    20.             public function  authenticate(user:User):void{   
    21.                   var call:Object = service.authenticate(user);   
    22.                   call.addResponder(responder);   
    23.             }   
    24.       }   
    25. }   
    26.     
    27. </EM></STRONG></EM></EM>  
    [xml] view plaincopyprint?
    1. <EM><EM><STRONG><EM>package com.ny.flex.cairngorm.service  
    2. {  
    3.       import com.adobe.cairngorm.business.ServiceLocator;  
    4.       import com.ny.flex.cairngorm.vo.User;  
    5.         
    6.       import mx.rpc.IResponder;  
    7.         
    8.       public class LoginDelegate  
    9.       {  
    10.             private var responder:IResponder;  
    11.             private var service:Object;  
    12.               
    13.             public function LoginDelegate(responder :IResponder){  
    14.               this.service =   
    15.                            ServiceLocator.getInstance()  
    16.                                         .getRemoteObject(“buddyRo”);  
    17.               this.responder = responder;  
    18.             }  
    19.               
    20.             public function  authenticate(user:User):void{  
    21.                   var call:Object = service.authenticate(user);  
    22.                   call.addResponder(responder);  
    23.             }  
    24.       }  
    25. }  
    26.    
    27. </EM></STRONG></EM></EM>  
    package com.ny.flex.cairngorm.service
{
      import com.adobe.cairngorm.business.ServiceLocator;
      import com.ny.flex.cairngorm.vo.User;
      
      import mx.rpc.IResponder;
      
      public class LoginDelegate
      {
            private var responder:IResponder;
            private var service:Object;
            
            public function LoginDelegate(responder :IResponder){
              this.service = 
                           ServiceLocator.getInstance()
                                        .getRemoteObject(“buddyRo”);
              this.responder = responder;
            }
            
            public function  authenticate(user:User):void{
                  var call:Object = service.authenticate(user);
                  call.addResponder(responder);
            }
      }
}

     

     

    返回的结果将回复到命令层(LoginCommand.as)的结果方法中，在此方法中Model被更新，然后数据被绑定到结果视图上：

    LoginCommand.as:

    Xml代码
    1. <EM><EM><STRONG>            public function result(event:Object):void   
    2.             {   
    3.                   var authUser:User = User(event.result);   
    4.                   BuddyAppModelLocator.getInstance().loginUser  
    5.                                                                                     = authUser;   
    6.                         BuddyAppModelLocator.getInstance().viewStackSelectedIndex=1;   
    7.             }   
    8. </STRONG></EM></EM>  
    [xml] view plaincopyprint?
    1. <EM><EM><STRONG>            public function result(event:Object):void  
    2.             {  
    3.                   var authUser:User = User(event.result);  
    4.                   BuddyAppModelLocator.getInstance().loginUser  
    5.                                                                                     = authUser;  
    6.                         BuddyAppModelLocator.getInstance().viewStackSelectedIndex=1;  
    7.             }  
    8. </STRONG></EM></EM>  
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  • 原文地址：https://www.cnblogs.com/tianlangshu/p/2478399.html
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