[Accessibility] IAccessibleEx equivalent

[Alexander Surkov]

Hi, Pete.

What is simple element? Does it implement IAccessible? Does it
implement IServiceProvider?

Alex.


On Thu, Feb 18, 2010 at 2:13 AM, Pete Brunet <pete at a11ysoft.com> wrote:
> Hi Alex, This is needed because you can't QI/QS a simple element.  A use
> case would be if the accessible is a simple element backed by an object
> implementing IA2.  As you most likely know, simple elements are only
> accessible via a reference to the parent IAccessible plus a non-zero
> child ID identifying a particular child simple element.  If you had the
> IAccessible, child ID pair and wanted a reference to the associated
> child IA2 object then you could use objectForChild.
>
> Does that make sense?
>
> Pete
> ---
> Alexander Surkov wrote:
>> Hi, Pete.
>>
>> I don't completely understand the idea of new interface. I'm looking
>> at examples at https://lists.linux-foundation.org/pipermail/accessibility-ia2/2008-June/000512.html
>> and it sounds this interface is intended to do the same we do by
>> QueryInterface and QueryService methods (the conversion from
>> IAccessible to IAccessible2 and vise versa). Could you please more
>> details?
>>
>> Thanks.
>> Alex.
>>
>>
>> On Wed, Feb 17, 2010 at 1:32 PM, Pete Brunet <pete at a11ysoft.com> wrote:
>>
>>> Here is some background one of today's topics:
>>>
>>> About two years ago Microsoft asked for the addition of two methods to IA2
>>> which would be equivalent to UIA's IAccessibleEx::GetObjectForChild and
>>> GetIAccessilbePair which translate back and forth between MSAA objects
>>> (including simple elements) and UIA objects.  The proposed IA2 equivalent
>>> is:
>>>
>>> IAccessibleSimple (or some other name like IAccessible2Ex)
>>>
>>> // For this parent accessible, fetch a full accessible representing the
>>> specified
>>> // child simple element where the accessible has implemented IAccessible2
>>> [propget] HRESULT objectForChild( [in] long childID, [out, retval]
>>> IAccessible2 *accessible2 );
>>>
>>> // For this accessible, fetch the parent accessible, childID pair
>>> representing an equivalent simple element
>>> [propget] HRESULT accessiblePair( [out] IAccessible * accessible, [out,
>>> retval] long childID );
>>>
>>> For background follow this link:
>>> http://bugs.freestandards.org/show_bug.cgi?id=114
>>>
>>> --
>>> Pete Brunet
>>>
>>> a11ysoft - Accessibility Architecture and Development
>>> (512) 238-6967 (work), (512) 689-4155 (cell)
>>> Skype: pete.brunet
>>> IM: ptbrunet (AOL, Google), ptbrunet at live.com (MSN)
>>> http://www.a11ysoft.com/about/
>>> Ionosphere: WS4G
>
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