RE: [flexcoders] How to programmatically make a custom ListItemRender?

Wed, 26 Apr 2006 23:20:23 -0700

Try mylist.itemRenderer = new ClassFactory(CustomRenderer);

-----Original Message-----
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of rigidcode
Sent: Wednesday, April 26, 2006 8:39 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] How to programmatically make a custom
ListItemRender?

I'm trying to make a custom ListItemRenderer in Actionscript. I was
able to make it display the list correctly, but when I click on
anything in the list, I get this error:

TypeError: Error #1009: null has no properties.
at
mx.controls::List/drawItem()[C:\dev\beta2\sdk\frameworks\mx\controls\Lis
t.as:1416]
at
mx.controls.listClasses::ListBase/selectItem()[C:\dev\beta2\sdk\framewor
ks\mx\controls\listClasses\ListBase.as:2907]
at
mx.controls.listClasses::ListBase/mouseDownHandler()[C:\dev\beta2\sdk\fr
ameworks\mx\controls\listClasses\ListBase.as:4369]
at
mx.controls::List/mouseDownHandler()[C:\dev\beta2\sdk\frameworks\mx\cont
rols\List.as:1801]

Every function in that call stack is not in the documentation.

My hello worldish custom listitemrenderer so far is:

public class CustomItemRenderer extends HBox implements IFactory,
IListItemRenderer {

public var thelabel:Label;

public function CustomItemRenderer() {
super();
this.thelabel=new Label();
this.thelabel.percentWidth=100;
this.addChild(this.thelabel);
}

public function newInstance():* {
return new CustomItemRenderer();
}

public override function get data():Object {
return super.data;
}

public override function set data(value:Object):void {
this.thelabel.text=value['label'];
super.data=""> dispatchEvent(new FlexEvent(FlexEvent.DATA_CHANGE));
}

}

I also tried with IDropInListItemRenderer, and I get the same error.
Here is my instantiation.  

var mylist:List = new List();
mylist.dataProvider=this.myarraycollection;
mylist.itemRenderer=new CustomItemRenderer();









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