Re: [flexcoders] Listening for CollectionEvent in custom component

[Alexander Farber]

Hello Wesley and others,

I have prepared a simple test case to demo my problem -
I'm trying to create a custom component which is being
fed with XML repeatedly coming from server.
My problem is that the CollectionEvent listener isn't fired.

Games.mxml:

<?xml version="1.0" encoding="utf-8"?>
<mx:VBox xmlns:mx="http://www.adobe.com/2006/mxml"; xmlns:my="*">

        <mx:Script>
                <![CDATA[
                        import mx.collections.*;
                        import mx.events.*;
                        
                        private var _xlist:XMLList;
                        
                        [Bindable]
                        public function get xlist():XMLList {
                                return _xlist;
                        }
                        
                        public function set xlist(x:XMLList):void {
                                _xlist = x;
                                trace("set(" + x +")");
                                list.dataProvider = x;
                                
list.dataProvider.addEventListener(CollectionEvent.COLLECTION_CHANGE,
xlistChanged);
                        }
                        
                        private function gameLabel(item:Object):String {
                                return "game: " + it...@label;
                        }
                        
                        private function 
xlistChanged(event:CollectionEvent):void {
                                trace("xlistChanged(" + event +")");
                                all.text = "All games: " + _xlist.game.length();
                                full.text = "Full games: " + 
_xlist.game.(user.length() == 3).length();
                                vacant.text = "Vacant games: " + 
_xlist.game.(user.length() < 3).length();
                        }
                ]]>
        </mx:Script>
        
        <mx:Label id="all" text="All games"/>
        <mx:Label id="full" text="Full games"/>
        <mx:Label id="vacant" text="Vacant games"/>
        
        <mx:List id="list" labelFunction="gameLabel"/>
        
</mx:VBox>


MyTest.mxml:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; xmlns:my="*">
        <mx:Script>
                <![CDATA[
                        import mx.events.*;
                        
                        private function changeXML1():void {
                                games = <games>
                                                        <game label="1">
                                                                <user/>
                                                                <user/>
                                                                <user/>
                                                        </game>
                                                        <game label="2">
                                                                <user/>
                                                                <user/>
                                                        </game>
                                                        <game label="3">
                                                                <user/>
                                                                <user/>
                                                                <user/>
                                                        </game>
                                                </games>;                       
                
                        }

                        private function changeXML2():void {
                                games = <games>
                                                        <game label="A">
                                                                <user/>
                                                                <user/>
                                                                <user/>
                                                        </game>
                                                        <game label="B">
                                                                <user/>
                                                                <user/>
                                                        </game>
                                                        <game label="C">
                                                        </game>
                                                </games>;                       
                
                        }
                ]]>
        </mx:Script>

        <mx:XML id="games">
                <games>
                        <game label="X">
                                <user/>
                                <user/>
                        </game>
                        <game label="Y">
                                <user/>
                                <user/>
                        </game>
                </games>
        </mx:XML>
        
        <mx:Button label="Change XML 1" click="changeXML1()"/>
        <mx:Button label="Change XML 2" click="changeXML2()"/>
        <my:Games xlist="{games.game}"/>
</mx:Application>

What am I doing wrong?

Regards
Alex