Re: A11y always-on in gnome-shell and GTK+ (was Re: A11y always-on in gnome-shell)

On Mon, 18 Jun 2012, Piñeiro wrote:

> On 06/15/2012 06:52 PM, Bastien Nocera wrote:
>> The next step would be to make the atk-bridge not snoop on keys when
>> there are no clients, so as to reduce the overhead.
>
> Strange, I thought that it was already the case, atk-bridge not
> registering to any event (key snooping included) unless one client is
> listening.
>
> Mike, could you confirm that?

It probably should be doing this, but, alas, it isn't. Right now 
atk-bridge has no way of knowing whether any keystroke listeners are 
active. I think we would want to do one of the following:

- add a DBus property that indicates whether any keystroke listeners are 
present, and have at-spi2-registryd send a PropertiesChanged signal as 
appropriate when this changes.

- Have at-spi2-registryd send signals when a listener is added or removed. 
Add a method to retrieve the currently-active listeners. Perhaps have 
atk-bridge send keystroke notifications to the listening applications 
directly rather than at-spi2-registryd being in the middle.

- Take at-spi2-registryd out of the business of handling listeners 
altogether. When a new application starts, have libatspi somehow notify it 
if a keystroke listener is present.

The first option seems easiest, and I'm tempted to go with it since I 
think that the goal is to eliminate these listeners in the medium to long 
term.

-Mike

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