[Webkit-unassigned] [Bug 100796] New: Should add FixedPositionViewportConstraints to ScrollingConstraints.h

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100796

           Summary: Should add FixedPositionViewportConstraints to
                    ScrollingConstraints.h
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com


ScrollingConstraints.h currently contains an abstract class called ViewportConstraints that is intended to encapsulate data and logic required to reposition elements whose layout depends on the viewport rect (positions fixed and sticky), when scrolling and zooming. However, at this time there is only a subclass for sticky. We should add a sub-class for fixed. This is required to get pages with fixes position elements scrolling on the scrolling thread.

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