Creating Own Meta Data in Flex

Creating Own Meta Data in Flex

作者:duzengqiang 日期:2007-09-28

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Creating Own Meta Data in Flex

To create your own meta data, in Flex you have to set compiler option: -keep-as3-metadata

Here is small example -

Index.mxml:

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

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">

<mx:Script>

<![CDATA[

private var metaData:MetaDataExample = new MetaDataExample();



private function displayDescription():void

{

textArea.text = metaData.description;

}

]]>

</mx:Script>

<mx:TextArea width="100%" height="100%" id="textArea"/>

<mx:Button label="Describe" click="displayDescription()"/>

</mx:Application>

MetaDataExample.as:

package

{

import flash.utils.*;

public class MetaDataExample

{

public function MetaDataExample()

{

}



public function get description():String

{

return describeType(this).toString();

}



[Orange(size="very big", isTasty="Yes Yes Yes Yes!")]

public function get prop():String

{ return "hello"; }

public function set prop(value:String):void

{ }

}

}

and finaly meta-config.xml:

<?xml version="1.0"?>

<flex-config xmlns="http://www.adobe.com/2006/flex-config">

<compiler>

<keep-as3-metadata>

<name>Orange</name>

</keep-as3-metadata>		

<keep-generated-actionscript>true</keep-generated-actionscript>		

<source-path>

<path-element>.</path-element>

</source-path>

</compiler>



<output>C:\Program Files\Adobe\Flex\Flex SDK 2\bin\Index.swf</output>

</flex-config>

Now you simply compile your application with -load-config+="meta-config.xml". And you have your own meta data in Flex.

P.S. in order to check it you can use flash.utils.describeType() method, here is what i’ve got:

<accessor name="prop" access="readwrite" type="String" declaredBy="MetaDataExample">

<metadata name="Orange">

<arg key="size" value="very big"/>

<arg key="isTasty" value="Yes Yes Yes Yes!"/>

</metadata>

</accessor>

This entry was posted on Saturday, January 20th, 2007 at 4:19 am and is filed under Flash Platform, Examples, ActionScript 3.0. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

5 Responses to “Creating Own Meta Data in Flex”

1. James Ward Says:
   January 20th, 2007 at 6:29 pm

   That’s very cool! I had no idea that was possible. Thanks!

2. Nirth Says:
   January 20th, 2007 at 7:47 pm

   Thanks to you.
   I’ve enjoyed your video with Bruce Eckel =)

3. Pete Says:
   August 28th, 2007 at 8:15 pm

   Hi,

   It works in debug mode, but I can’t get it to work in run mode. Do you have any suggestions? Thanks!

4. Nirth Says:
   August 28th, 2007 at 10:42 pm

   Can you provide me with more info please? version of flex etc.

5. Pete Says:
   August 29th, 2007 at 11:52 am

   Hi, I spoke to someone of Adobe and it seems that there are some versions of Flex Builder who cause this problem. Manually Compiling with mxmlc did the job. Thanks.