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From Erik de Bruin <e...@ixsoftware.nl>
Subject Re: Improvement of mobile scrollings
Date Fri, 03 Oct 2014 12:59:27 GMT
I would say that you can best implement this by adding property that you
give the initial value of the constant you mention. Instead of assigning
the constant (elsewhere in the code, I haven’t looked), you would assign
the property. The property setter would have to take care of any additional
assignments during runtime, i.e. when you want to up the value to > 60.

Would you like to try and create a patch that does this? Simple attach it
to a (new) JIRA ticket and tell this list; a committer will surely pick it
up, check it and apply it to the SDK. If the tests (Mustella) pass, you
will have made a valuable contribution!


On Fri, Oct 3, 2014 at 11:37 AM, after24 <vincent@after24.net> wrote:

> Hi,
> While trying to find the best ways to get smooth scrollings on mobile, no
> matter the type of optimization (pure as3 ItemRenderers...) or settings
> used
> (framerate, stage quality...) the result is always the same :
> - The scrolling is jerky when the user touch the screen (a list for
> example)
> and drags its content.
> -There is a significative difference of scrolling smoothness depending on
> whether an element is "thrown" or dragged by the user.
> The reason is due to a constant in the Spark Scroller code :
> /private static const MAX_DRAG_RATE:Number = 30;/
> With this constant, no matter the framerate of the application, the refresh
> frequency of the viewport content position can't exceed 30 frames per
> second.
> Using a monkey patch I set the value of this constant to 60 (just like the
> framerate of the application) and I could observe a very net improvement of
> the scrolling smoothness during drag operations.
> May be this value could be changed for a higher one or the constant
> replaced
> by a property that match dynamically the framerate of the application (at
> least when the framerate exceeds 30 fps).
> What do you think ?
> --
> View this message in context:
> http://apache-flex-development.2333347.n4.nabble.com/Improvement-of-mobile-scrollings-tp41029.html
> Sent from the Apache Flex Development mailing list archive at Nabble.com.

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