[Accessibility-ia2] accNavigate relation queries

[William W. Smith]

That solves the concern I had: I'll need to do the QI's on the 
IDispatch  in the order first IAccessible and then if that fails try 
IEnumVARIANT.    The case I was considering was when the IDispatch  
QI'ed to both IAccessible and IEnumVARIANT at the same time.

Bill

Aaron Leventhal wrote:
> Here's the rule:
> 1) You'll always get an IDispatch pointer
> 2) If it QI's to IAccessible, it's a single target
> 3) If it QI's to IEnumVARIANT there are multiple targets
> 4) If it's null there are no targets
> 5) Nothing else is possible.
>
> Is that what you want from it?
>
> - Aaron
>
> William W. Smith wrote:
>> Hi,
>>
>> How will the AT know whether the return value from the accNavigate is 
>> the actual target of the relation vs. a  parent of multiple targets?
>>
>> I think that if the return value from accNavigate could be either a 
>> UI object and a indirect reference to the targets, sometimes both 
>> could be QI'd to IEnumVariant to get the children of the UI element 
>> in a manner that  would be equivalent to the multiple target technique. 
>> If I understand  it correctly, this would mean that the result from 
>> the accNavigate needs to always return a IDispatch representing a 
>> single object or always something that could be QI'd to 
>> IEnumVarariant or but not a combination of the two to prevent the 
>> results from being ambiguous.
>>
>> Bill
>>
>> accessibility-ia2-request at lists.freestandards.org wrote:
>>  
>>>> Larry,
>>>>
>>>> I have them documented here:
>>>> http://www.mozilla.org/access/windows/at-apis#knowndif
>>>>
>>>> They cannot be programatically discovered.
>>>>
>>>> We don't support more than 1 relation target yet, but we can do 
>>>> that by
>>>> returning an IUnknown which can be QI'd to an IEnumVARIANT. That's
>>>> similar to how get_accSelection() already works.
>>>>
>>>> - Aaron
>>>>           
>>
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>>
>>   
>

-- 
Bill Smith
bills at gwmicro.com
GW Micro, Inc.
Fort Wayne, IN