Personally I have a huge preference for AS only itemrenderers however that said, at first glance I would ask why are you adding a event listener when the button has this built in?
<mx:Button click="onClick(event);" xmlns:mx="http://www.adobe.com/2006/mxml"; initialize="init();"> Take note of the (click="onClick(event);") above. As for the updateDisplayList, I suggest you read up on what its for and just how important it is jason -----Message d'origine----- De : [email protected] [mailto:[EMAIL PROTECTED] la part de durnelln Envoyé : vendredi 16 mars 2007 11:22 À : [email protected] Objet : [flexcoders] Datagrid Button Renderer Performance Hi all, I have a simple button renderer (below) which I use in my datagrids. All seemed fine but I now have four of these button renderers in each row of my datagrid(s) and performance starts to suffer when there are many rows on display at once (my app can easily have a hundred or more rows on display in various datagrids). I've noticed that when a row's data changes, the updateDisplayList function is called on every button renderer in that row. Does anyone know why this is or how I can stop it happening? The row data does not affect the visual appearance of the button so there is no need to redraw it every time the row data changes. I'm thinking this constant redrawing of the buttons might be the cause of the performance issues as I could quite easily have, say, 400 button renderers on screen at once and the row data changes quite frequently. Any ideas? This is my button renderer: <?xml version="1.0" encoding="utf-8"?> <mx:Button xmlns:mx="http://www.adobe.com/2006/mxml"; initialize="init ();"> <mx:Script> <![CDATA[ import custom.DataGridButtonClickEvent; //action to request when button is clicked public var action:String; //a copy of the data passed in to send back if the button is clicked private var _data:Object; //listen for button click events private function init():void { this.addEventListener (MouseEvent.CLICK, onClick); } //called when grid data changes or scrolls - determine button enabled status override public function set data (value:Object):void { if (value != null) { _data = value; } } //local click handler to dispatch a custom event containing the requested action private function onClick(e:MouseEvent):void { //dispatch an event containing the row data and requested action if ((enabled) && (action)) { dispatchEvent(new DataGridButtonClickEvent(_data, this.id, action, true, true)); } } ]]> </mx:Script> </mx:Button> Thanks, Nick.
