Correct, in PowerPoint, when a presentation is started, both NVDA and JAWS, and presumably at some
point, Narrator, too, will grab the slide contents and present it slide by slide like a web page.
JAWS even annotates links, tables, lists, etc., in a very rich way. NVDA, to my knowledge, doesn't
do that yet.
In MS Office, screen readers have largely switched to using UI Automation (UIA) for access to all things
documents and UI. This is primarily because of Narrator, which doesn't support anything other than UIA (MSAA
and IA2 are only supported by way of an IA2 to UIA bridge, which is slow and unreliable). As a consequence,
Microsoft never got on the IAccessible2 bandwaggon, but has pushed the UIA implementation in the Chromium
project so they can stop using the IAccessible2ToUIA Bridge for Narrator's access to web content. There were
even plans and experiments to switch Firefox over to UIA when I was still working at Mozilla. But since I am
no longer involved there, I don't know if this is still on the table for the time after they finish the
"Cache The World" project.
So, in the long term, and as resources permit, the more future-proof way forward for LibreOffice on
Windows might be to switch over to an UIA implementation as well. But even without that, there
would need to be a concerted effort between the Impress and screen reader teams, like NVDA, to make
NVDA realize that it is in a slide show in presentation mode, and gain all the access to the slide
contents like it were a web page or similar. That cannot be achieved by one party alone I think.
And getting Vispero on board for JAWS support is an even bigger fish to fry.
From: Jason White <firstname.lastname@example.org>
Sent: Tuesday, June 7, 2022 9:34 PM
Subject: Re: [libreoffice-accessibility] Re: ESC meeting minutes: 2022-05-26
On 7/6/22 06:07, Michael Weghorn wrote:
I tried again with just a single screen instead of two, and then NVDA
announces "Slide 1", then reads out the slide content, and when moving
further: "Slide 2" and its content, etc.
Is that what you think Impress should do as well? (It didn't in a
quick test with gtk3 on Linux.)
Yes. If I recall correctly, under MS-Windows/PowerPoint, NVDA and JAWS both support arrow key
navigation in the slide contents when the slides are being presented (i.e., after F5 is used to
start a presentation).
Ideally, one should be able to do the same in LibreOffice/Impress, and under Linux also.
Space/Backspace navigate among slides in Windows/PowerPoint too.
Obviously, Impress needs a similar keyboard mechanism for slide navigation.
None of this should depend on the number of attached displays. I don't think anyone wants their
accessibility to fail just in virtue of the number of displays that happen to be connected.
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