[Webkit-unassigned] [Bug 110965] New: Allow focus ring quads to be computed relative to container

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=110965

           Summary: Allow focus ring quads to be computed relative to
                    container
           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: anilsson at rim.com
                CC: tonikitoo at webkit.org, jpetsovits at rim.com,
                    mifenton at rim.com, anilsson at rim.com


Currently, it's possible to compute the absolute focus ring quads, but with a minor tweak it would be possible to compute them relative to container as well.

The BlackBerry port has always rendered the focus ring ("tap highlight", we call it) as a separate overlay to avoid re-rendering the page when the user taps a link. This is an optimisation. We're now switching to an approach where the tap highlight overlay is a child of the container that contains the tapped element. This allows our tap highlight overlay to move along with scrollable divs, frames, fixed pos items etc despite being a separate overlay. Unfortunately, the tap highlight computations currently do not support transforms, and this patch will not change that.

I want to put the patch up for review here to get your feedback.

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