Rich,
The particular use case here is around text, yes? IA2/ATK/JA-API should
all expose character boundary information (the bounding rectangle of
every character in every accessible object). Likewise, the boundary of
whatever the text is contained in is likewise exposed. So it should be
a fairly trivial operation for a screen magnifier to do this clipping
operation - just by clipping to the object containing the text.
No?
Regards,
Peter Korn
Accessibility Principal
Oracle
Hi Alex,
Exposing clipped content is great for screen readers. What AI Squared
is saying is that they would like to know something is not visible (
due to clipping) as they are trying to magnify what is visible.
Imagine you have low vision and are reading a text and magnifying that
part of the scree but it is partially obscured. So, you are magnifying
a part of the screen that does not exist visually.
Having access to the offscreen information is essential for a screen
reader user who may be searching for content and does no care if
something is obscured but for a magnifier users this is a problem. AI
Squared has had to resort to using their offscreen model which
represents only visual information to magnify as things are being read
to the user.
I would like to reduce the dependency on having to use screen scraping
technology. It is invasive to systems and is less accurate than
accessibility APIs.
Rich
Rich Schwerdtfeger
CTO Accessibility Software Group
*Alexander Surkov <[email protected]>*
05/15/2010 01:35 AM
To
Richard Schwerdtfeger/Austin/i...@ibmus
cc
[email protected], [email protected],
[email protected], Shawn Warren
<[email protected]>
Subject
Re: [Accessibility-ia2] exposing content that is not visible
Hi, Rich.
Clipped and scrolled off elements operable, for example, keyboard
shortcuts works. So I would say they should be accessible, expose
offscreen state, attached to accessible tree and as consequence no new
API is needed. At least this is how it works in Firefox.
Thank you.
Alex.
On Sat, May 15, 2010 at 6:47 AM, Richard Schwerdtfeger
<[email protected]> wrote:
> I was speaking with Shawn Warren of AI Squared and he indicated that he
> would like to have IA2 be able to hid access to content that is not
visible.
> In particular it appears Shawn was referring to content and
componentry that
> was clipped out due to window size and other windows obscuring the
content.
>
> I was thinking about this and perhaps the right way to do this would
be have
> an API feature that would turn on clipping for at least documents.
What do
> others think?
>
>
> Rich Schwerdtfeger
> CTO Accessibility Software Group
>
> _______________________________________________
> Accessibility-ia2 mailing list
> [email protected]
> https://lists.linux-foundation.org/mailman/listinfo/accessibility-ia2
>
>
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