[Webkit-unassigned] [Bug 92394] New: [Qt] Fix axis locking when panning on N9

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=92394

           Summary: [Qt] Fix axis locking when panning on N9
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: lauro.neto at openbossa.org


Steps to reproduce:

- Run a rather recent version of Qt5 and WebView (Since June), opening up a page that allows panning in all directions (e.g. a zoomed page).
- Pan it.
- Lift the finger, the screen will update (which currently is slow, taking at least at least a couple of seconds, but it's another problem).
- While the screen is updating, slowly swipe the finger again to pan, or even just press the screen.
- Almost always the screen will lock. If panning vertically, the screen will lock horizontally.

About locking easily, the problem seems to be that the AxisLocker class uses a QElapsedTimer to check the time between the events. The intense CPU work when updating the screen causes the events to be delivered late, leading to wrong elapsed time values. Often the touch events were received with less than 5 miliseconds between them.

About the wrong axis, on N9 the native X orientation is landscape. So when swiping vertically in portrait mode (default usage), the TouchPoing.screenPos() coordinates changes the x member, not the expected y member.

Cleaning up a working patch to upload.

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