[Webkit-unassigned] [Bug 222111] New: Clean up ScrollableArea and ScrollAnimator API and convert less between offsets and positions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222111

            Bug ID: 222111
           Summary: Clean up ScrollableArea and ScrollAnimator API and
                    convert less between offsets and positions
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mrobinson at webkit.org
                CC: simon.fraser at apple.com
        Depends on: 146696

The ScrollableArea and ScrollAnimator API is a bit confusing when it comes to scrolling to offsets and positions. It isn't always clear when these APIs will trigger an animation and we are missing some opportunities to use "native" animations on Mac. These APIs also require a lot of conversion back and forth between offsets and positions. Finally, cleaning up this API will allow us to use native animations to do scroll snapping during thumb dragging.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=146696
[Bug 146696] Scroll snapping doesn't kick in when dragging scrollbars
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