[Webkit-unassigned] [Bug 96403] [chromium] Flings halt immediately on Android content shell

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=96403





--- Comment #9 from Iain Merrick <husky at chromium.org>  2012-09-11 11:19:02 PST ---
Here's the Android API that we're calling through to:

http://developer.android.com/reference/android/widget/OverScroller.html#fling(int, int, int, int, int, int, int, int)

If we don't set minX/maxX/minY/maxY, the OverScroller object won't know the bounds of the layer being scrolled, so the gesture adapter will just keep calling scrollBy() until the curve finishes. The layer will just ignore any scrollBy() it can't handle.

If we have nested scrollable layers, this does mean that a single fling gesture could spill over into the outer layer. I think we don't want that on Android -- it should stop the fling when the current layer is exhausted, then scroll the outer layer on the *next* fling -- but it's a pretty subtle distinction.

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