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From Deepak MS <megharajdee...@gmail.com>
Subject Re: Improve spark List performance
Date Tue, 03 Sep 2013 13:38:30 GMT
It's always best to use actionscript based renderers for mobile projects,
instead of mxml based.
http://tv.adobe.com/watch/adc-presents/create-itemrenderers-for-flex-mobile-projects/

That might help you.


On Tue, Sep 3, 2013 at 6:59 PM, Federico De Maddalena <
f.demaddalena@patente.it> wrote:

> Hi Ben
> I'm developing a mobile project, not desktop!
> Images in use are very small.
> Usevirtuallayout is set on true.
> The code is here:
>
>         <fx:Script>
>                 <![CDATA[
>                         import spark.components.Button;
>                         import spark.core.ContentCache;
>
>                         import events.SchedaEvent;
>
>                         static public const s_imageCache:ContentCache=new
> ContentCache();
>
>                         override public function set
> data(value:Object):void
>                         {
>                                 super.data=value;
>                                 lezione.text=value.titolo;
>
> img.source="img/lez/"+value.lezione+"g.png";
>
>                                 schede.removeAllElements();
>                                 for(var i:int=0; i<value.schede.length;
> i++)
>                                 {
>                                         var button:Button=new Button();
>                                         button.label=String(i+1);
>                                         button.id=value.schede[i];
>                                         button.height=40;
>                                         button.width=40;
>
> button.addEventListener(MouseEvent.CLICK, handleMouseClick);
>                                         schede.addElement(button);
>                                 }
>                         }
>
>                         private function
> handleMouseClick(event:MouseEvent):void
>                         {
>                                 sendEvent(parseInt(event.currentTarget.id
> ));
>                         }
>
>                         private function sendEvent(id:int):void
>                         {
>                                 var e:SchedaEvent=new
> SchedaEvent(SchedaEvent.LOAD_SCHEDA);
>                                 e.Id=id;
>
>                                 this.owner.dispatchEvent(e);
>                         }
>                 ]]>
>         </fx:Script>
>
>         <s:HGroup width="100%" height="100%" paddingTop="3">
>                 <s:VGroup height="100%" width="20%" verticalAlign="top"
> horizontalAlign="center">
>                         <s:Image width="80%" height="80%" id="img"
> contentLoader="{s_imageCache}"/>
>                 </s:VGroup>
>                 <s:VGroup height="100%" width="70%">
>                         <s:Label width="100%" height="20%" id="lezione"/>
>                         <s:TileGroup width="100%" height="80%"
> id="schede"/>
>                 </s:VGroup>
>
>         </s:HGroup>
>
> -----Messaggio originale-----
> Da: Ben Smeets [mailto:ben@okapion.com]
> Inviato: martedì 3 settembre 2013 15.22
> A: users@flex.apache.org
> Oggetto: Re: Improve spark List performance
>
> How many rows in the list? (i.c.w. useVirtualLayout)
>
> The setup you mention shouldn't be a problem I think (unless the image you
> talk about is 200MB a pop), but depends on the implementation (details).
> E.g., if the buttons are created every scroll, instead of reused, that
> might be a cause.
>
> Any code you can share, can help (me at least) to track down the culprit.
>
> Not a guru here though, so maybe others will know off the top of their
> heads :)
>
> Ben
>
> P.S. We are talking desktop app here right? Mobile is a different beast
> all together (for me).
>
>
>
> On 3 sep. 2013, at 15:16, Federico De Maddalena <f.demaddalena@patente.it>
> wrote:
>
> > Hi! I'm working on a mobile project.
> > I created a spark List, which item renderer is an extension of
> > ItemRenderer. Each of my item renderer contains one spark Image, one
> > Label and a number of small buttons which varies from 3 to 20.
> > Now, scrolling the list is terribly slow. There are ways to improve
> > scroll speed? I spent a lot of time but without success.
> > Regards
> > federico
> >
>
>

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