Re: [g-a-devel] How to indicate disabled state

I would prefer to remain with what gail does; I view it as the reference implementation of the AT-SPI. Changing the behavior of an established meaning and implementation to accommodate a difference in a new API for a different platform (IAccessible2) seems odd to me. It also seems like something that would put existing assistive technologies that depend upon the current implementation at risk.

Having said all that, we currently use STATE_SENSITIVE in Orca to determine if anything (e.g., a label, a pushbutton, etc.) is grayed out or not. This may or may not be the right thing to do, but empirical testing in an ambiguous world seemed to indicate this was the most reliable check.

Of course, if there were one common accessibility infrastructure for all platforms and we were all working against that infrastructure, the story would be different. IMO, that's the next generation we should be striving for rather than repeatedly reinventing the same API model for specific platforms. Based upon my experiences and discussions with folks over the past few years, not many people are ready for that yet.


Bill Haneman wrote:
Aaron Leventhal wrote:
Bill Haneman wrote:
My vote would be to retain FOCUSABLE when an object is greyed out, but that could confuse clients who expect the object to remain in the focus chain.
First, thanks for your input on this. Not to muck things up, but I would really prefer that FOCUSABLE is consistent between IAccessible2 and ATK/AT-SPI. Otherwise every cross-platform app is going to make a mistake here. In MSAA FOCUSABLE means it's focusable right now, which means it's cleared if it's not currently in the focus chain. Apps like Window-Eyes and JAWS use FOCUSABLE to know which objects to visit as the user moves by focusable item in their review mode. I realize that they are 2 different APIs, but, do you see my point about trying to keep things the same as much as possible?
I do see your point. However, there are two downsides; it means the implementation in GTK+ and to date is inconsistent with Firefox, and it leaves Peter's problem unsolved.

- Aaron
On the other hand, I don't think there are currently any clients which enumerate the FOCUSABLE objects and make such an inference, and the upcoming Collection API would allow objects to be returned in "Tab order", potentially giving clients a way to obtain the equivalent info (i.e. which objects are in the focus chain).


Peter Parente wrote:

How should the atk/AT-SPI states be used to indicate a widget is
disabled/grayed? In gail, it looks like:

widget is interactive
widget is not interactive because it is currently disabled
3) !STATE_FOCUSABLE means the widget is never interactive so it's
neither enabled or disabled

In Firefox 3.0, STATE_FOCUSABLE is removed when a widget is
disabled/grayed. This makes the second case (currently disabled) and
third case (can never be enabled or disabled) indistinguishable. This
is problematic for an AT which wants to announce "disabled" when an
interactive widget is currently not available for interaction, but say
nothing when the widget can never become interactive. For instance,
consider a grayed submit button on a web page versus a paragraph of
text on the same page.

According to the AT-SPI docs:

"STATE_FOCUSABLE: Indicates this object can accept keyboard focus,
which means all events resulting from typing on the keyboard will
normally be passed to it when it has focus."

When a control is in a disabled stated, it cannot accept the keyboard
focus. Under this interpretation, it sounds like Firefox is doing the
right thing. But then there is still a lack of distinction.

Does anyone have an elegant solution or recommendation that doesn't
involve having the AT revert to guessing which roles are interactive
and which are not?

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