RE: [flexcoders] MXML inheritance

[Alex Harui]

Children are not created until the parent is added to the display list.

 

________________________________

From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of jerusalem_pilgrim
Sent: Monday, April 21, 2008 11:54 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] MXML inheritance

 

I'm trying to use inheritance between mxml files in a project, and I'm
running into trouble.

I have a Container object defined in the parent mxml file, and in the
init() method for the child mxml file, I can't access the container
from the parent because it's null.

Is there any special trick I need to use in order to access elements
of an mxml component when using mxml inheritance?

Thanks in advance!

myBase.mxml:

<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml
<http://www.adobe.com/2006/mxml> " 
xmlns="*" 
width="900" height="700">

<mx:Script>
<![CDATA[

public function positionBookHolder(newX:Number, newY:Number):void {
trace("Container from base: " + this._bookHolder + " " +
_bookHolder);
this._bookHolder.x = newX;
this._bookHolder.y = newY;
this._bookHolder.visible = true;
}

public function init():void {
//Do nothing; subclasses will override this.
trace("base object init()");
}
]]>
</mx:Script>

<mx:SWFLoader id="_background" x="0" y="0"
source="{_backgroundSource}" />

<mx:Container 
id="_bookHolder" 
width="1096" height="600" 
visible="false"
scaleX="0.13" scaleY="0.13" 
rotation="-29" 
x="75" y="590">

</mx:Canvas>

myChildComponent.mxml:

[CODE]
<view:myBase xmlns:mx="http://www.adobe.com/2006/mxml
<http://www.adobe.com/2006/mxml> "
xmlns:view="my.company.project.view.components.*"
creationComplete="init();">

<mx:Script>
<![CDATA[
public override function init():void {
super.init();
trace("child init()");
trace("Container from child: " + this._bookHolder + " " +
super._bookHolder);
this.positionBookHolder(-196, 91);
}

]]>
</mx:Script>

</view:myBase>

I'm creating an instance of myChildComponent in a .as class and then
executing the init(); method:

myASFile method:

var viewObj:myChildComponent = new myChildComponent();
trace("viewObj created");
viewObj.init();

Results of execution:
viewObj created
base object init()
child init()
Container from child: null null (should be references to the Container)
Container from base: null null (should also be references to the
Container)