AX: Add remote search support for keyboard focusable element search type

[Eric Liang]

In order to support accessibility keyboard navigation in web view, the following API support is requested:

Adding another option to AXUIElementsForSearchPredicate to search for keyboard focusable elements.
If AXWebArea is passed in as the currentElement, then return the first keyboard focusable element inside the web view.
If a random descendant of the web view is passed in as the currentElement, then find the next keyboard focusable elements in the DOM order.
If no more keyboard focusable element is found, then pass the AXWebArea as the result.

[Eric Liang]

rdar://problem/48578156

[Eric Liang]

Created attachment 363683 [details]
Patch

[chris fleizach]

Comment on attachment 363683 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=363683&action=review

> Source/WebCore/accessibility/AccessibilityNodeObject.cpp:1163
> +    Element* element = this->element();

this seems like it could be in AccessibilityObject, then it doesn't have to be virtual

> Source/WebCore/accessibility/AccessibilityNodeObject.cpp:1166
> +    return element->isFocusable();

this can be written like

if (Element* element = this->element())
   return element->isFocusable();

return false;

[Eric Liang]

Created attachment 363716 [details]
Patch

[chris fleizach]

Comment on attachment 363716 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=363716&action=review

> Source/WebCore/accessibility/AccessibilityObject.cpp:197
> +        

can you undo this whitespace line change

> Source/WebCore/accessibility/AccessibilityObject.cpp:3501
> +    if (Element* element = this->element())

auto element

[Eric Liang]

Created attachment 363718 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 363718 [details]
Patch

Clearing flags on attachment: 363718

Committed r242528: <https://trac.webkit.org/changeset/242528>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.