AX: Add accessibility support for details element on iOS

• Component: Accessibility
• Status: RESOLVED FIXED

[Nan Wang]

The details/summary elements are poorly supported on iOS.

Issues:
1. There's no expanded/collapsed status announced from VoiceOver.
2. Impossible to navigate through them using VoiceOver. VO cursor is jumping randomly.

<rdar://problem/27914836>

[Nan Wang]

Created attachment 289013 [details]
patch

[chris fleizach]

Comment on attachment 289013 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=289013&action=review

> Source/WebCore/accessibility/ios/WebAccessibilityObjectWrapperIOS.mm:1840
> +    for (AccessibilityObject* parent = object; parent; parent = parent->parentObject()) {

can we make a function that takes a lambda for running up the parent chain and returning a match object?
and then replace all such places with that ?

> Source/WebCore/accessibility/ios/WebAccessibilityObjectWrapperIOS.mm:1871
> +            // webkit.org/b/162041 Taking focus onto elements inside a details node will cause VO focusing onto random items.

why is this the case?
should we put this check inside canSetFocusAttribute() instead

[Nan Wang]

Comment on attachment 289013 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=289013&action=review

Thanks, will address other issues.

>> Source/WebCore/accessibility/ios/WebAccessibilityObjectWrapperIOS.mm:1871
>> +            // webkit.org/b/162041 Taking focus onto elements inside a details node will cause VO focusing onto random items.
> 
> why is this the case?
> should we put this check inside canSetFocusAttribute() instead

There must be something special with the details element that I haven't had chance to dig into. I think on iOS it's ok to not set focus inside details element when VO tries to focus on it.

[Nan Wang]

Comment on attachment 289013 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=289013&action=review

>>> Source/WebCore/accessibility/ios/WebAccessibilityObjectWrapperIOS.mm:1871
>>> +            // webkit.org/b/162041 Taking focus onto elements inside a details node will cause VO focusing onto random items.
>> 
>> why is this the case?
>> should we put this check inside canSetFocusAttribute() instead
> 
> There must be something special with the details element that I haven't had chance to dig into. I think on iOS it's ok to not set focus inside details element when VO tries to focus on it.

I put it here because this will only affect iOS.

[chris fleizach]

Comment on attachment 289013 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=289013&action=review

>>>> Source/WebCore/accessibility/ios/WebAccessibilityObjectWrapperIOS.mm:1871
>>>> +            // webkit.org/b/162041 Taking focus onto elements inside a details node will cause VO focusing onto random items.
>>> 
>>> why is this the case?
>>> should we put this check inside canSetFocusAttribute() instead
>> 
>> There must be something special with the details element that I haven't had chance to dig into. I think on iOS it's ok to not set focus inside details element when VO tries to focus on it.
> 
> I put it here because this will only affect iOS.

ok seems reasonable

[Nan Wang]

Created attachment 289027 [details]
patch

- updated function to take a lambda to search for matched parent object.

[Nan Wang]

Will look into the patch build issue

[Nan Wang]

Created attachment 289029 [details]
patch

Fixed the patch

[Nan Wang]

Created attachment 289241 [details]
patch

Updated style for matchFunc

[WebKit Commit Bot]

Comment on attachment 289241 [details]
patch

Clearing flags on attachment: 289241

Committed r206102: <http://trac.webkit.org/changeset/206102>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.