Comment 7 by mdcurran on 2009-11-29 01:22
I have started work on this.
BZR branch http://bzr.nvaccess.org/nvda/ia2LiveRegions

The work consists of detecting these events in nvdaHelperRemote, checking the object to see if it is a live region, and what kind of live region it is, and then, possibly sending the text back to NVDA for speaking.

To make this possible, I also had to work on getting text to NVDA for speaking from another process. We already had nvdaControler, which was a good, but old, RPC implementation, but this has been removed and now nvdaController is now a new rpc implementation inside nvdaHelperLocal. nvdaHelperRemote in this live region case is the rpc client, though in future it will be possible for us to make another stand-alone rpc client library for use in any application, to force NVDA to speak.

Live region support in the above branch currently:

supports aria-live:polite,assertive and rude. Though currently due to NVDA not having any particular speech prioritization, there is no difference between the three.
Supports aria-relevant:additions,text, all, and not specified.
Does not support aria-relevant:removed. Not sure what exactly to speak here, nore how to handle internationalization for a word like 'removed' since our in-process code doesn't really have any internationalization capabilities at the moment.
Does not yet support aria-atomic:true. Technically this isn't too hard to do in Firefox though.
This support only works in IAccessible2 applications, specifically most best in Mozilla Gecko applications. Support for IE or non-IAccessible2 browsers would be completely different, there is no useful way to abstract this.

In short this new code improves upon NVDA's old live region support by providing much better performance for many/large updates. NVDA now speaks text changes in live regions rather than only additions. Live region markup is followed much more accurately. Since the NVDA 2009.1 beta and or RC, only the last 3 or so live region updates in quick succession were being spoken. This code also fixes this.

Finally note that as most of this code is inside nvdaHelper (c++ dll) to test you will either have to compile your own nvdaHelper, or wait until a new one is compiled before or at the time of merging this branch in to main.

Uh oh!

NVDA should handle events other than "show" for live regions #246

Description

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

Issue actions