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    Default Answered: Scrolling performance is awful on BB10

    Answered: Scrolling performance is awful on BB10


    I've tested this out with trivial list apps as well as the kitchen sink.

    Is this the fault of Ext.scroll.Scroller or the browser? Scrolling performance is pretty decent on Android and iOS.

    Sidenote: Why does Sencha delegate scrolling behaviour to Ext.scroll.Scroller instead of the device's platform (like in JQuery Mobile)? It seems weird to have elastic scrolling for Android when it's not part of their UI language.

  2. Just stopping in to say that we have refactored scrolling for BB10 for the 2.2.0 RC release (next release). When it does come out (I have no public dates right now) I'd be very interested in knowing your experience with the refactor.

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    Quote Originally Posted by keyworks2 View Post
    Sidenote: Why does Sencha delegate scrolling behaviour to Ext.scroll.Scroller instead of the device's platform (like in JQuery Mobile)? It seems weird to have elastic scrolling for Android when it's not part of their UI language.
    To normalize and sometimes optimize scrolling across platforms.
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    It seems like an unnecessary perk to normalize scrolling across all platforms though. And it seems kind of costly to run some javascript, recalculate styles and trigger reflow every time you put your finger to the touch screen.

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    In the case of fastbook, the scrolling is quite great. If things are done properly there really isn't any side effects. Some platforms are different than others and things will be worked through. I personally haven't used BB10 much so I can't judge it but I have used iOS and Android and have had success with the apps I have made.
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    So just for anyone else who has this problem, in Ext.scroll.Indicator I put an else if for BB10 and used Ext.scroll.indicator.CssTransform instead of Ext.scroll.indicator.Default. I'm already seeing noticeable improvements in scrolling responsiveness for BB10 after literally 2 lines of code.

    Does this mean we could potentially see some BB10 specific scrolling code in a future release?

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    I will open a ticket in our bug system to investigate this more.
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    Just stopping in to say that we have refactored scrolling for BB10 for the 2.2.0 RC release (next release). When it does come out (I have no public dates right now) I'd be very interested in knowing your experience with the refactor.
    Mitchell Simoens @SenchaMitch
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    Thanks! Much appreciated.

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