[Webkit-unassigned] [Bug 150554] New: Fast-click heuristic should account for scrolling distance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150554

            Bug ID: 150554
           Summary: Fast-click heuristic should account for scrolling
                    distance
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iOS
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wenson_hsieh at apple.com

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.

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