What is the Issue number so I can vote for it?
On Tue, Feb 18, 2014 at 6:39 PM, Alex Harui <aha...@adobe.com> wrote:
>
>
> They should all virtualize, but it takes a bit of effort to make a
> virtual TileLayout and we don't hear enough requests for it to get around
> to doing it.
>
>
> -Alex
> ------------------------------
> *From:* flexcoders@yahoogroups.com <flexcoders@yahoogroups.com> on behalf
> of Chris Velevitch <chris.velevi...@gmail.com>
> *Sent:* Friday, February 14, 2014 5:35 PM
> *To:* flexcoders@yahoogroups.com
>
> *Subject:* Re: [flexcoders] Whay are too many itemrenderers being created?
>
>
>
> Why shouldn't all lists virtualise? If the dataProvider of a list has a
> large or very large number of items, doesn't it make sense to only create
> enough itemRenderers for the visible area?
>
>
> On Sat, Feb 15, 2014 at 9:30 AM, Alex Harui <aha...@adobe.com> wrote:
>
>>
>>
>> Yep, didn't notice you are using TileLayout. I'm pretty sure it doesn't
>> virtualize
>>
>>
>> From: Chris Velevitch <chris.velevi...@gmail.com>
>> Reply-To: "flexcoders@yahoogroups.com" <flexcoders@yahoogroups.com>
>> Date: Friday, February 14, 2014 2:26 AM
>> To: "flexcoders@yahoogroups.com" <flexcoders@yahoogroups.com>
>> Subject: Re: [flexcoders] Whay are too many itemrenderers being created?
>>
>>
>>
>> That makes no difference. I did notice that <VerticalLayout/> always
>> virtualises regardless of whether useVirtualLayout is true or false.
>>
>> It looks like <TileLayout/> never virtualises, so I suspect it's a bug,
>> but I haven't had a chance to look into how layouts work to confirm this.
>>
>>
>> On Fri, Feb 14, 2014 at 5:37 PM, Alex Harui <aha...@adobe.com> wrote:
>>
>>>
>>>
>>> useVirtualLayout property?
>>>
>>> From: Chris Velevitch <chris.velevi...@gmail.com>
>>> Reply-To: "flexcoders@yahoogroups.com" <flexcoders@yahoogroups.com>
>>> Date: Thursday, February 13, 2014 7:34 PM
>>> To: "flexcoders@yahoogroups.com" <flexcoders@yahoogroups.com>
>>> Subject: [flexcoders] Whay are too many itemrenderers being created?
>>>
>>>
>>>
>>> I'm using Flex 4.11 with Air 4.0 to create a mobile app.
>>>
>>> I have a spark list with a custom mxml itemRenderer. Only 4 instances
>>> will be visible in the list. The dataprovider is initially empty.
>>>
>>> When I assign the array collection with an array of 147 items, I get
>>> 147 traces on dataChange event and on the render event. I traced out the
>>> value of 'this' and I get 147 unique objects.
>>>
>>> I was under the impression that only 4 instances of the itemRenderer
>>> will be created and get reused as I scroll through the list.
>>>
>>> What have I overlooked?
>>>
>>> The list is defined as:-
>>>
>>> <s:List id="lImages" dataProvider="{imageList}" width="100%"
>>> height="100%" allowMultipleSelection="true"
>>> change="lImagesChange(event)" itemRenderer="PhotoThumbNail"
>>> doubleClickEnabled="true" doubleClick="showImage(event)">
>>> <s:layout>
>>> <s:TileLayout/>
>>> </s:layout>
>>> </s:List>
>>>
>>> and the itemRenderer is defined as:-
>>>
>>> <?xml version="1.0"?>
>>> <s:ItemRenderer
>>> xmlns:fx="http://ns.adobe.com/mxml/2009";
>>> xmlns:s="library://ns.adobe.com/flex/spark"
>>> dataChange="onDataChange(event)"
>>> render="onRender(event)"
>>> width="150" height="175"
>>> >
>>>
>>> <s:layout>
>>> <s:VerticalLayout/>
>>> </s:layout>
>>>
>>> <fx:Script><![CDATA[
>>> import DateUtils;
>>>
>>> import mx.events.FlexEvent;
>>>
>>> private function onDataChange(event:FlexEvent):void {
>>> trace(DateUtils.currentTime() +
>>> "PhotoThumbNail.onDataChange: dataChange event, index=" + itemIndex + ",
>>> this="+this);
>>> }
>>>
>>> private function onRender(event:Event):void {
>>> trace(DateUtils.currentTime() + "PhotoThumbNail.onRender;
>>> render event, index=" + itemIndex + ", this="+this);
>>> }
>>> ]]></fx:Script>
>>> <s:BitmapImage source="{data.image}" width="150" height="150"/>
>>> <s:Label text="{data.timestamp}" width="150"/>
>>>
>>> </s:ItemRenderer>
>>>
>>> --
>>>
>>>
>>> Chris
>>> --
>>> Chris Velevitch
>>> Manager - Adobe Platform Users Group, Sydney
>>> m: 0415 469 095
>>> www.apugs.org.au
>>>
>>> Adobe Platform Users Group, Sydney
>>> Topic: TBD
>>> Date: Monday, 28th February
>>> Details and RSVP on
>>> http://www.meetup.com/Sydney-Adobe-Platform-User-Group
>>>
>>>
>>>
>>>
>>
>>
>> --
>>
>>
>> Chris
>> --
>> Chris Velevitch
>> Manager - Adobe Platform Users Group, Sydney
>> m: 0415 469 095
>> www.apugs.org.au
>>
>> Adobe Platform Users Group, Sydney
>> Topic: TBD
>> Date: Monday, 28th February
>> Details and RSVP on
>> http://www.meetup.com/Sydney-Adobe-Platform-User-Group
>>
>>
>>
>>
>
>
> --
>
>
> Chris
> --
> Chris Velevitch
> Manager - Adobe Platform Users Group, Sydney
> m: 0415 469 095
> www.apugs.org.au
>
> Adobe Platform Users Group, Sydney
> Topic: TBD
> Date: Monday, 28th February
> Details and RSVP on http://www.meetup.com/Sydney-Adobe-Platform-User-Group
>
>
>
>
>
--
Chris
--
Chris Velevitch
Manager - Adobe Platform Users Group, Sydney
m: 0415 469 095
www.apugs.org.au
Adobe Platform Users Group, Sydney
Topic: TBD
Date: Monday, 28th February
Details and RSVP on http://www.meetup.com/Sydney-Adobe-Platform-User-Group
