Hi,
Well, I think maybe it worth an official blog post, teaching developers how to
improve the touch scrolling performance as the example I provided.
But I don't think it worth a patch right now, giving it's a little technique
for how to use cacheAsBitmap wisely.
Sent from DarkStone's iPhone
2014-12-02
> 在 2014年12月2日，7:32，OmPrakash Muppirala <bigosma...@gmail.com> 写道：
>
> Agreed!
>
> After24/Darkstone, any chance you submit a patch to the Flex SDK? I can
> help you out with things if you need.
>
> Thanks,
> Om
>
>> On Mon, Dec 1, 2014 at 10:46 AM, Harbs <harbs.li...@gmail.com> wrote:
>>
>> I was thinking the same thing.
>>
>> Maybe incorporating this into some mobile skins?
>>
>>> On Dec 1, 2014, at 3:01 PM, Erik de Bruin <e...@ixsoftware.nl> wrote:
>>>
>>> Is there a way to bring this solution into the SDK and make it the
>>> default behavior on mobile? Maybe register these event handlers upon
>>> creation, dependant on Capabilities or some such?
>>>
>>> It would sure be a nice addition to the next release ...
>>>
>>> EdB
>>>
>>>
>>>
>>>> On Mon, Dec 1, 2014 at 12:26 PM, jude <flexcapaci...@gmail.com> wrote:
>>>> This is great!
>>>>
>>>>> On Sat, Nov 29, 2014 at 1:04 PM, DarkStone <darkst...@163.com> wrote:
>>>>>
>>>>> Hi after24,
>>>>>
>>>>>
>>>>> I've tried doing the scrolling optimization by using
>>>>> BitmapData.copyPixels() as you described, and I have also tried
>>>>> cacheAsBitmap, the result is, the performance between both are the
>> same!
>>>>> So there is no need to modify Scroller.as anymore, the cacheAsBitmap
>> can
>>>>> easily do the same thing.
>>>>>
>>>>>
>>>>> Here is the sample code for how to use cacheAsBitmap to improve the
>>>>> scrolling performance:
>>>>> <s:Scroller width="100%" height="100%">
>>>>> <s:Group>
>>>>> <s:DataGroup id="realContent"
>> touchInteractionStart="realContent.mouseChildren=false;realContent.cacheAsBitmap=true;"
>> touchInteractionEnd="realContent.mouseChildren=true;realContent.cacheAsBitmap=false;"
>>>>> itemRenderer="com.test.renderers.MyItemRenderer"
>> dataProvider="{someData}"
>>>>> width="100%">
>>>>> <s:layout>
>>>>> <s:VerticalLayout useVirtualLayout="false"/>
>>>>> </s:layout>
>>>>> </s:DataGroup>
>>>>> </s:Group>
>>>>> </s:Scroller>
>>>>> The essential elements are:
>>>>> 1. You have to put a Group inside the Scroller, then put the real
>> content
>>>>> (<s:DataGroup id="realContent">) inside that Group.
>>>>> 2. The layout of the realContent, you have to set its useVirtualLayout
>> to
>>>>> false (the default value is false).
>>>>> 3. Listen for the realContent's touchInteractionStart and
>>>>> touchInteractionEnd event:
>>>>> When touchInteractionStart, disable any mouse and touch interactions of
>>>>> the realContent's mouseChildren by setting realContent.mouseChildren =
>>>>> false, then turn on the cache for realContent by setting
>>>>> realContent.cacheAsBitmap = true.
>>>>> When touchInteractionEnd, reverse the changes you made for the
>> realContent.
>>>>> That's it! It's very easy to improve the scrolling performance by doing
>>>>> so. It's the same scrolling performance result when compared to the
>>>>> BitmapData.copyPixels() approach, yet cacheAsBitmap is much easier to
>>>>> understand and handle, so we don't have to do the modify the
>> Scroller.as
>>>>> any more, the cacheAsBitmap approach is the best way to improve the
>>>>> scrolling performance now!
>>>>> If you not believe me, test it yourself : )
>>>>>
>>>>>
>>>>> DarkStone
>>>>> 2014-11-30
>>>>>
>>>>>
>>>>>
>>>>> At 2014-10-29 18:56:09, "after24" <vinc...@after24.net> wrote:
>>>>>> Hi Jude,
>>>>>>
>>>>>> /*have you tried setting include in layout to false when setting
>> visible
>>>>> to
>>>>>> false?*/
>>>>>>
>>>>>> Yes, this property is set to false during scroll operations.
>>>>>>
>>>>>> It seems that this performance decrease is caused by scout... when
>> scout
>>>>> is
>>>>>> off, there is no difference between the two approaches (visible =
>> false or
>>>>>> removeElement).
>>>>>>
>>>>>> So it looks like this optimization is viable :-)
>>>>>>
>>>>>> I am a bit busy this week but I will add a ticket on the JIRA with a
>>>>> sample
>>>>>> application as soon as possible.
>>>>>>
>>>>>> Thank you.
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> View this message in context:
>> http://apache-flex-development.2333347.n4.nabble.com/Scroller-optimization-tp41774p41910.html
>>>>>> Sent from the Apache Flex Development mailing list archive at
>> Nabble.com.
>>>
>>>
>>>
>>> --
>>> Ix Multimedia Software
>>>
>>> Jan Luykenstraat 27
>>> 3521 VB Utrecht
>>>
>>> T. 06-51952295
>>> I. www.ixsoftware.nl
>
