条件表达式问题的灵活评估（数据绑定？）

Question

I'm in trouble with valuation of conditional expression in Flex .

Let me explain.

I have this :

    <s:Label text="SomeTextLawyer" includeInLayout="{Session.isLawyer()}"
 visible="{Session.isLawyer()}"/>
    <s:Label text="SomeTextDoctor" includeInLayout="{Session.isDoctor()}"
 visible="{Session.isDoctor()}"/>

This Session object is defined as below :

public class Session extends Singleton
{
    [Bindable]
    private static var user:User;

[...]

    public static function isDoctor():Boolean {
        return Session.user.type == model.type.DOCTOR;
    }

    public static function isLaywer():Boolean {
        return Session.user.type == model.type.LAWYER;
    }
}

I have a mechanism that change the user, so my user can be first a doctor and then a lawyer. Problem is that my labels keep their first valuation. If I connect as a doctor first, I still have the doctor label displayed if I change my user as a lawyer. And vice versa...

On the AS code, my user is the good kind of user, but not on my mxml files... So only the displayed part doesn't see the user switching.

Any idea ?

Thank you in advance !

Answer 1

try using a bindable boolean var to check the user type, for example :

[Bindable] public var isDoctor:Boolean;
[Bindable] public var isLawyer:Boolean; 

and set their values in your show control routine, for example:

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
               creationComplete="application1_creationCompleteHandler(event)">
    <fx:Declarations>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
    </fx:Declarations>
    <fx:Script>
        <![CDATA[
            import mx.events.FlexEvent;

                [Bindable] public var isDoctor:Boolean;
                [Bindable] public var isLawyer:Boolean; 

            protected function application1_creationCompleteHandler(event:FlexEvent):void
            {
                isDoctor = Session.isDoctor();
                isLawyer = Session.isLawyer();
            }

        ]]>
    </fx:Script>
    <s:VGroup>
        <s:Label text="Some Text Lawyer" includeInLayout="{isLawyer}"  visible="{isLawyer}"/>
        <s:Label text="Some Text Doctor" includeInLayout="{isDoctor}"  visible="{isDoctor}"/>
    </s:VGroup>
</s:Application>