[Webkit-unassigned] [Bug 63312] New: scrollWheel cocoa events to scrolling DIV elements ignored

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63312

           Summary: scrollWheel cocoa events to scrolling DIV elements
                    ignored
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://www.firebreath.org
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Major
          Priority: P2
         Component: WebKit API
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: taxilian at fb.com


We are hosting a WebView in an offscreen NSWindow and rendering to a CGContext as part of a NPAPI plugin. We proxy the events from the browser to the offscreen window and everything works well except for one thing:

When I send a scrollWheel event through the normal event mechanism, I get inconsistent results.  If the page itself is larger than fits in the view it seems that a NSScrollView is created and hosts it; this view scrolls with the proxied scrollWheel cocoa events just fine.  However, when the page fits the bounds and there is a scrolling div inside the page these scrollWheel events are completely ignored.

I have tried doing a hitTest and walking up the tree of superviews, even sending the event to each one, with no success.

The source for the event dispatch code can be found here: https://github.com/firebreath/FireBreath/blob/master/src/libs/WebView/Mac/WebViewMac.mm#L408

This bug is consistent whether the npapi plugin is hosted in firefox, chrome, or safari.

Facebook is looking to roll out a new Photo Upload plugin that will use this functionality on Mac but we are concerned about releasing something where the scroll wheel is completely inoperable. The WebView is used to provide a secure UI area where security-sensitive APIs can be used without any direct connection to the rest of the web page.

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