Check property in effect filer function

   
<?xml version="1.0" ?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                creationComplete="initFilter(event);" width="700">
    <mx:Script>
    
    import mx.effects.EffectTargetFilter;
    import flash.events.Event;
    public function filterFunc(propChanges:Array,instanceTarget:Object):Boolean {
       for (var i:uint=0; i < propChanges.length; i++){
          if (propChanges[i].target == instanceTarget){
             if (propChanges[i].end["x"] != undefined){
                  return (propChanges[i].end.x > 100);
             }
          }
       }
       return false;
    }
    
   
    private function initFilter(event:Event):void {
        var myBlurFilter:EffectTargetFilter = new EffectTargetFilter();
        myBlurFilter.filterFunction=filterFunc;
        myBlur.customFilter=myBlurFilter;
        myUnBlur.customFilter=myBlurFilter;
    }
  
    </mx:Script>
    <mx:states>
        <mx:State name="One">
            <mx:SetProperty target="{p1}" name="x" value="110"/>
            <mx:SetProperty target="{p1}" name="y" value="0"/>
            <mx:SetProperty target="{p1}" name="width" value="500"/>
            <mx:SetProperty target="{p1}" name="height" value="210"/>
        </mx:State>
    </mx:states>
    <mx:transitions>
        <mx:Transition fromState="*" toState="*">
        <mx:Sequence id="t1" targets="{[p1]}">
            <mx:Blur id="myBlur" duration="100" blurXFrom="0.0" blurXTo="10.0" blurYFrom="0.0" blurYTo="10.0"/>
            <mx:Parallel>
                <mx:Resize duration="400"/>
            </mx:Parallel>
            <mx:Blur id="myUnBlur" duration="100" blurXFrom="10.0" blurXTo="0.0" blurYFrom="10.0" blurYTo="0.0"/>
        </mx:Sequence>
        </mx:Transition>
    </mx:transitions>
    <mx:Canvas id="pm" width="100%" height="100%">
        <mx:Panel id="p1" title="One" x="0" y="0" width="100" height="100" click="currentState='One'" >
            <mx:Label fontSize="24" text="One"/>
        </mx:Panel>
    </mx:Canvas>
</mx:Application>

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Check property in effect filer function : Effect « Effects « Flex

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