RESOLVED WONTFIX 150554
Fast-click heuristic should account for scrolling distance 
https://bugs.webkit.org/show_bug.cgi?id=150554
Summary Fast-click heuristic should account for scrolling distance
Wenson Hsieh
Reported 2015-10-25 22:46:53 PDT
Currently, the fast-clicking heuristic only change in zoom level into account. This means double tapping clickable elements near the edge of the viewport will fast-click instead of scroll to the element, since the change in zoom is negligible in this case. We should allow double-tapping to scroll in this case if the amount by which we would scroll in either axis is more than a configurable distance (a ratio of the device dimensions in either axis). Additionally, this heuristic should allow double-tap scrolling to work even in the unscalable viewport case — that is, if double-tapping a clickable element near the edges of the viewport in a non-user-scalable page, we should scroll to that element instead of immediately dispatching the click.
Attachments
Patch (23.25 KB, patch)
2015-10-26 09:39 PDT, Wenson Hsieh 		no flags
DetailsFormatted DiffDiff
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Wenson Hsieh
Comment 1 2015-10-25 22:47:24 PDT
<rdar://problem/23250766>
Wenson Hsieh
Comment 2 2015-10-26 09:39:19 PDT
Created attachment 264046 [details] Patch
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