[Webkit-unassigned] [Bug 32658] New: Make it easier for plug-ins to participate in the Accessibility hierarchy

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=32658

           Summary: Make it easier for plug-ins to participate in the
                    Accessibility hierarchy
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Enhancement
          Priority: P2
         Component: Plug-ins
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ssp-web at earthlingsoft.net


A plug-in should participate in the accessibility hierarchy.

To do that it needs to supply an AXParent element to
-accessibilityAttributeValue:.

Finding the correct element for that seems unnecessarily hard as the NSView
subclassed by the plug-in seems to be contained in another element in the
accessibility hierarchy which is not easily accessed:

Accessibility Inspector shows:

<AXApplication: "Safari">
 <AXWindow: "YouTube - Hampe Recycling Werbung (Kino)">
  <AXGroup>
   <AXScrollArea>
    <AXWebArea: "HTML-Inhalt">
     <AXGroup: "Blocked Flash content">          ← mystery element I have to
reference
      <AXGroup: "Blocked Flash content">         ← plug-in's element

I should return the 'mystery' AXGroup as the plug-in's AXParent element to keep
the accessibility hierarchy intact, but it doesn't seem to be returned by any
convenient method.

Instead I had to resort to looping through all elements on the page and some
speculation, giving code like this to find the desired object:

id value = nil;
id webArea = [[[self superview]
accessibilityAttributeValue:NSAccessibilityChildrenAttribute] objectAtIndex:0];
    NSArray * webAreaChildren = [webArea
accessibilityAttributeValue:NSAccessibilityChildrenAttribute];
    CTFForEachObject( NSObject , child, webAreaChildren ) { // looping macro
        NSArray * subChildren = [child
accessibilityAttributeValue:NSAccessibilityChildrenAttribute];
        if ([subChildren count] == 1) {
            id firstSubChild = [[child
accessibilityAttributeValue:NSAccessibilityChildrenAttribute] objectAtIndex:0];
            if ( firstSubChild == self ) {
                value = child;
                break;
            }
        }
    }
return value;

This seems all of non-obvious, non-elegant and not particularly efficient to
me. Perhaps WebKit could assist plug-ins a bit more in being good accessibility
citizens and provide a method returning the relevant object.

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