Re: [orca-list] About accessible features of ROLE_UNKNOWN

[Joanmarie Diggs <joanmarie diggs gmail com>]

Hi Leena.

On Thu, 2010-04-01 at 15:16 +0530, leena chourey wrote:
> Can anybody tell about What accessibility features atspi ROLE_UNKNOWN
> has? 

I'm afraid you cannot make a one-to-one correspondence between an Atk
role of an object and the accessibility features (e.g. whether or not it
implements the accessible text interface).

In other words, this documentation you quote:

> As said in the doc: Accessibility Namespace Reference. :
> "ROLE_UNKNOWN 
> The object contains some Accessible
> information, but its role is not
> known."

should be taken quite literally, at face value: It means you don't know
the role. Period.

> But I am not able to find those features Or how can we add feature to
> any GNOME widget.

If you want to see if a given object, of any Atk role -- including
ATK_ROLE_UNKNOWN -- implements a particular accessible interface, you
should query that interface. For instance, given accessible object acc
and using Python, acc.queryText() will return the accessible text
interface should it exist for that object.

Note that it is possible for some parts of a given interface to be
implemented (hypothetically atk_text_get_text might be implemented, but
atk_text_add_selection might not be).

As for how to add features to (i.e. implement the above interfaces in) a
widget, that is something that we don't do on the Orca side of things.
The creator of the widget must do the implementation. Then Orca can
access what has been implemented.

HTH.
--joanie