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:[email protected]]
Inviato: martedì 3 settembre 2013 15.22
A: [email protected]
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 <[email protected]>
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
>
