Rich, What other apps are using this message? How are they using it?
===
Richard Schwerdtfeger wrote:
I have to agree with Andres. WM_GETOBJECT is not solely used by
AT.
Rich Schwerdtfeger
CTO Accessibility Software Group
 Andres
Gonzalez ---05/25/2010 08:48:08 AM---WM_GETOBJECT is NOT a reliable way
of detecting AT either, since it may be triggered by apps and even
device drivers that don't
WM_GETOBJECT is NOT a reliable way
of detecting AT either, since it may be triggered by apps and even
device drivers that don't have anything to do with AT, so you are
guarantied false positives even with the best heuristics. I'm very
interested in developing a reliable handshake mechanism with AT, and
would love to hear from others with ideas/proposals on this respect.
Perhaps we can take this task for the next edition of IA2 in this list,
or by a subgroup of interested parties, and bring back a concrete
proposal to the general group.
Thanks,
--Andres.
From: [email protected] [mailto:[email protected]] On Behalf Of Pete Brunet
Sent: Monday, May 24, 2010 4:18 PM
To: James Teh
Cc: IAccessible2 mailing list
Subject: Re: [Accessibility-ia2] screen
reader present flag
Thanks Jamie, I'll have to check with the architects
to see if they would have any issues with blocking. If I can block then
I might also be able to lazily call into the secondary thread to build
the tree as needed. -Pete
===
James Teh wrote:
On 25/05/2010 8:37 AM, Pete Brunet wrote:
Thanks Jamie, [using WM_GETOBJECT to
dynamically enable accessibility] may be a problem for the case where
the app has
multiple threads and a secondary thread needs to be called by the window
proc to participate in the building of the accessibility tree. Is it
acceptable to block the UI thread?
I don't see why this is any different to
creating the tree in the same
thread. Either way, it will block the UI thread, as the WM_GETOBJECT
message needs to return the requested accessible object. Can you
shorten
the setup time by creating parts of the tree lazily only when requested?
Jamie
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