Problem in update of views presentation models

Hi all

I am trying to create a login using cairngorm screen and presentation model. I created a main screen that has two components - the screen logon and member. They appear according to the connection process. The problem is that even after the successful - connection, I can not update view.

I know why - because I create two instances of presentation model for Main.mxml in Main.mxml and format for it.

// Presentation model for Main.mxml
public class MainModel {
     public var prop:String;
     public function callbackFunc( value:String ) {
          prop = value;
     }
}


// Presentation model for Login.mxml
public class LoginModel {
     public function doLogin( username:String, password:String ) {
          var mainModel:MainModel = new MainModel(); // Instance created
          var event:LoginEvent = new LoginEvent( mainModel.callbackFunc, username, password );
          event.dispatch();
     }
}


<!-- Main.mxml -->
<mx:Script>
<![CDATA[
     [Bindable]
     public var model:MainModel = new MainModel(); // Another instance created
]]>
<mx:ViewStack id="views" selectedIndex="{model.prop}">
     <views:MemberScreen />
     <views:Login />
</mx:ViewStack>


<!-- Login.mxml -->
<mx:Script>
<![CDATA[
     [Bindable]
     public var model:LoginModel = new LoginModel();
]]>
<!-- form elements here -->
<mx:Button label="login" id="btnLogin" click="{model.doLogin( 'abc', 'def' )}" />

In this scenario, I make use of the callback function to the display to get updated when the loginEvent fires. But the view not updated because of two separate proceedings.

How should I use the presentation model pattern in this scenario, as well as callback functions?

Thanks and greetings

ShiVik

You could do a Singleton to the principal so that way everywhere, you use it, you use the same instance of it. Or if you use the Cairngorm ModelLocator (not that I recommend) has a single instance of the principal and you access anywhere else via the ModelLocator.

Tags: Flex

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