Lubuntu and Accessibility

frederik.gladhorn at frederik.gladhorn at
Mon Jun 6 20:05:53 UTC 2011


On Jun 6, 2011, at 3:42 AM, ext Alex Midence wrote:
> I seem to recall that Klaus Knopix is reputed to have had some success
> making LXDE accessible in his Knopix Adrienne distribution.   Perhaps
> that is something that could be used as reference?  As for
> python-related slowness in Orca, I would tend to agree.  C is just
> faster than Python.  Interpreted languages are going to require far
> more memory and resources than compiled ones in many cases.
> Actually, a saner thing would be an implementation of orca written in
> both C or c++ and Python.  The low-level code in c and the more
> scriptable areas in Python.  This is what NVDA's devs did and it's a
> slighning fast screen reader on a bloated system like Windows.  While
> we're wishing, I'll go ahead and wish for iaccessible2 support instead
> of complete and exclusive reliance on at-spi/at-spi2 so that more
> widget toolkits might become accessible since some of them do support
> iaccessible2 but not at-spi.

the APIs of IAccessible2 and at-spi2 are very similar.
Their big difference is the implementation. IAccessible2 (based on MSAA) uses Windows COM for inter process communication.
at-spi2 uses dbus.

That means having IAccessible2 on Linux doesn't make much sense. And implementing it using DBus you end up with exactly at-spi2.
Please don't propose solutions that simply don't match the problem.

Instead of speculating about performance we should use profiling tools to see where the performance lags.
I suspect DBus is a large part of it. And the way we use DBus is used is another big issue. Python may or may not play a role.


>  I'm on a orle here so, I'll keep
> wishing.  I want a faster, lag-free web browsing experience with
> something akin to an off screen model, navigation by element list.
> and an expanded list of elements by which one can navigate like div
> and span.   The inferior browsing experience in Linux is the only
> thing that keeps me going back to windows.
> Just my two cents,
> Alex
> Date: Sat, 4 Jun 2011 09:49:37 +0200
> From: Halim Sahin <halim.sahin at>
> To: ubuntu-accessibility at
> Subject: Re: Lubuntu and Accessibility
>> Message-ID: <20110604074937.GA25814 at gentoo.local>
>> Content-Type: text/plain; charset=us-ascii
>> Hi,
>> On Di, Mai 24, 2011 at 01:14:32 +1000, Luke Yelavich wrote:
>>> The first thing is making sure LXDE is actually accessible, i.e make
>>> sure it has keyboard shortcuts, and supports the launching of the
>>> accessibility framework at startup etc. As to using the LXDE GUI with
>>> Orca etc, I think the biggest problem here is the use of python. The
>> Hmm, do you think we should replace orca in all desktop environments by
>> a c-implementation?
>> Slow performance is not related to lxde only. Orca isn't faster in gnome
>> as well so I can't understand what you want to say here.
>> Regarding lxde a11y:
>> I played a bit with the components in the past.
>> The most dificult problem was to run at-spi-registryd before the first
>> gtk app starts.
>> The application menu works (ctrl+esc).
>> pcmanfm in desktopmode doesn't read anything.
>> pcmanfm started in filemanager mode works when changing to details in
>> menu->view.
>> The buttons/panels are not accessible on the desktop because of missing
>> keyboard shortcuts afaik.
>> HTH.
>> Halim
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