Hi Pete[r],
Yes calculating 'reverse' relations is very expensive in gecko too. For
example, walking the DOM looking for:
RELATION_CONTROLLED_BY
RELATION_DESCRIPTION_FOR
RELATION_FLOW_FROM
RELATION_LABEL_FOR
RELATION_NODE_CHILD_OF
Because there might be a node "out there" somewhere that cares about the
element we are currently interested in. The cost becomes that much more
user saddening when the dom is highly mutating, and we want the state of
things (like relations) to be up to date when we fire events (based on
dom mutation).
I'm looking at ways to mitigate this computation.
cheers,
David
On 12/09/09 5:16 PM, Peter Korn wrote:
Pete,
Is this not something we can do with AccessibleState (sorry, I always
fall back to Java-style naming)? Maintaining relations can be fairly
expensive for the application (I'm recalling conversations with
OpenOffice.org engineers here). It does require the AT to walk the UI
tree once to determine which UI components it might want to monitor
even when they don't have focus, but that doesn't seem too onerous to
me. Also, how much of this kind of monitoring will happen in the
absence of scripting on the part of the AT?
Regards,
Peter Korn
Accessibility Architect & Principal Engineer,
Sun Microsystems, Inc.
> We fire IA2_EVENT_TEXT_INSERTED
Thanks David,
What is the best way to genericize the handling of non-focused areas
that need to be paid attention to? Perhaps we need
IA2_RELATION_LIVE_REGIONS_OF on the top level window and
IA2_RELATION_LIVE_REGION_FOR for the components that update out of
focus and should be responded to?
Will the "live region" components need any object attributes like
indicating that they are live regions and states indicating the
priority level of the region? Perhaps the object attribute isn't
needed and would be redundant information if the state exists.
What other ideas do you have?
---
Pete Brunet wrote:
What means can be used to respond to changes in a chat log? Would
IA2_EVENT_TEXT_UPDATED be used? For MSAA controls would
EVENT_OBJECT_VALUECHANGE be used?
--
*Pete Brunet*
a11ysoft - Accessibility Architecture and Development
(512) 238-6967 (work), (512) 689-4155 (cell)
Skype: pete.brunet
IM: ptbrunet (AOL, Google), [email protected] (MSN)
http://www.a11ysoft.com/about/
Ionosphere: WS4G
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