[Webkit-unassigned] [Bug 233234] New: Need a way to test scrolling momentum animations

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Nov 16 20:24:41 PST 2021


            Bug ID: 233234
           Summary: Need a way to test scrolling momentum animations
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Currently WheelEventTestMonitor doesn't know about momentum animations, but even if it did, it's impossible to write a test that determines whether an "End" momentum event has interrupted the momentum. This is because we start the animator when we see the momentum "Began", ignoring the rest of the momentum changed. The animator runs on a display link callback on the scrolling thread, so we don't have a reliable way to know when the animator has run enough frames to move content around.

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