Thank you. On Wed, Feb 25, 2015 at 4:13 PM, <kgu...@mozilla.com> wrote: > On Wednesday, February 25, 2015 at 2:40:12 AM UTC-5, Paul Rouget wrote: >> When is onscroll called if apzc is enabled? > > The scroll event is fired every time APZC sends a repaint request to the main > thread (which is what changes the scroll position). > >> How often? > > Generally this is controlled by the apz.pan_repaint_interval during panning > (while the finger is down) and the apz.fling_repaint_interval during flinging > (residual movement after the finger has been lifted). However we can also > request repaints at other times for various reasons, and there is some code > that prevents multiple repaint requests from being inflight simultaneously. > Note that since the scroll event is dispatched on the main thread, any > blocking main-thread operations will also impact this. So there isn't a > definite answer to this but if you reduce apz.pan_repaint_interval and > apz.fling_repaint_interval to around 16 that's about as fast as it's going to > get. > >> When is the first scroll event fired? > > Should be apz.pan_repaint_interval milliseconds after the scroll starts. > >> Will using onscroll prevent apzc to work properly? > > Using onscroll doesn't slow down the APZ like touch listeners do, but if > you're doing a lot of stuff in that handler it may cause the main thread to > be more busy which can increase the risk of checkerboarding. Short-running > listeners should have negligible impact. > > Cheers, > kats > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform
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