Re: [orca-list] Fwd: collapse/ expanded /expandable state of tree views in QT4/ QT5 applications

[Joanmarie Diggs <jdiggs igalia com>]

So the problem is that Orca assumes that things which are expandable
have the "expandable" state. This is not the case for Qt apparently.
Arguably that is a bug in Qt. That said.... Given that the presence of
the "expanded" state is sufficient for "expanded" and that Qt exposes
the "collapsed" state (unlike other apps and toolkits), I've modified
Orca to no longer require the "expandable" state for expandable items.
As a result, when you arrow to such items in Dolphin, that state is now
presented as expected. At least for me. That's the good news.

The bad news is that Qt is not emitting state-changed:expanded when you
left and right arrow. Instead, it emits a state-changed:focused event.
Orca sees this focused event and says, "User is already on that, no need
to announce it again." and remains silent. While I could hack around
that for Qt apps, that would be a sad hack and generally a bad idea.
When the state of an accessible object changes, the toolkit or app
should emit object:state-changed event for the specific state which has
been changed. Which in this case is expanded; not focused.

If Qt were to emit object:state-changed:expanded with detail1 = 1 when
expanded, and detail1 = 0 when collapsed, Orca should automatically do
the correct thing. Since you're working with the Qt community, any
chance you can get this missing event added?

Thanks again!
--joanie

On 10/17/18 11:04 AM, Joanmarie Diggs wrote:
> OK, that got things working. Thanks! Mind you, by working I mean it
> eventually shows up in Accerciser and Orca. I am seeing delayed
> responses, including in Accerciser, and a lot of console spew in the
> terminal where I launched Dolphin, including lines like:
>
> qt.accessibility.core: Cannot create accessible child interface for
> object:  PlacesView(0x5597ab8ce650)  index:  12
>
> QSpiApplication::keyEventError  "org.freedesktop.DBus.Error.NoReply"
> "Did not receive a reply. Possible causes include: the remote
> application did not send a reply, the message bus security policy
> blocked the reply, the reply timeout expired, or the network connection
> was broken."
>
> Anyhoo, I can see state expandable and confirm Orca is not presenting
> it. I still need to debug why.
>
> Thanks again!
> --joanie
>
> On 10/17/18 10:27 AM, chrys linux-a11y org wrote:
> > Howdy Joanie,
> >
> > Oh this is quite interesting since in QT5 it should work OOTB.
> >
> > # quote start
> > export QT_ACCESSIBILITY=1 (this is needed for Qt 4, fixed in Qt 5)
> > # quote end
> > source:
> > https://techbase.kde.org/Development/Tutorials/Accessibility/Screen_Reader_Setup
> >
> >
> > but the debian guys set this:
> >
> > # quote start
> > QT_ACCESSIBILITY=1
> > QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1
> >
> > export QT_ACCESSIBILITY QT_LINUX_ACCESSIBILITY_ALWAYS_ON
> > # quote end
> > source:
> > https://mail.kde.org/pipermail/kde-accessibility/2016-November/003115.html
> >
> > let me know if it works for you, i will pin it down to the KDE wiki then.
> >
> > cheers chrys
> >
> > ----- Weitergeleitete Nachricht von Joanmarie Diggs <jdiggs igalia com>
> > -----
> >   Datum: Wed, 17 Oct 2018 09:52:26 +0200
> >     Von: Joanmarie Diggs <jdiggs igalia com>
> > Betreff: Re: [orca-list] collapse/ expanded /expandable state of tree
> > views in QT4/ QT5 applications
> >      An: chrys <chrys linux-a11y org>
> >      Cc: orca-list <orca-list gnome org>
> >
> > Will take a look. In the meantime, could you please save me the
> > googling: What do I need to enable accessibility support for Qt? When I
> > look in accerciser, I see Dolphin with 0 children.
> >
> > Thanks!
> > --joanie
> >
> > On 10/16/18 9:40 PM, chrys wrote:
> > > Hello Joanie,
> > >
> > >
> > > i currently work on some KDE accessibility. i recognize that orca does
> > > not speak the collapse/ expanded /expandable information for tree views.
> > > I checked with Accerciser, it looks like the information is available.
> > > could you add them to the presentation? that would be very cool :).
> > > thanks!
> > >
> > > reproduce:
> > >
> > > install "dolphin" the file manager of KDE
> > >
> > > open dolphin -> select the tree view
> > >
> > > arrow around up/ down and expand/ collapse items with arrow left / right.
> > >
> > > result:
> > >
> > > dolphin is perfectly accessible but the collapse/ expand information is
> > > missing.
> > >
> > >
> > > other example would be the room list of "mumble". an popular VIOP chat
> > > application.
> > >
> > >
> > > cheers chrys
> > >
> > > _______________________________________________
> > > orca-list mailing list
> > > orca-list gnome org
> > > https://mail.gnome.org/mailman/listinfo/orca-list
> > > Orca wiki: https://wiki.gnome.org/Projects/Orca
> > > Orca documentation: https://help.gnome.org/users/orca/stable/
> > > GNOME Universal Access guide:
> > > https://help.gnome.org/users/gnome-help/stable/a11y.html
> > > Log bugs and feature requests at http://bugzilla.gnome.org
> >
> > ----- Ende der weitergeleiteten Nachricht -----
> >
> >
> > _______________________________________________
> > orca-list mailing list
> > orca-list gnome org
> > https://mail.gnome.org/mailman/listinfo/orca-list
> > Orca wiki: https://wiki.gnome.org/Projects/Orca
> > Orca documentation: https://help.gnome.org/users/orca/stable/
> > GNOME Universal Access guide:
> > https://help.gnome.org/users/gnome-help/stable/a11y.html
> > Log bugs and feature requests at http://bugzilla.gnome.org
>
> _______________________________________________
> orca-list mailing list
> orca-list gnome org
> https://mail.gnome.org/mailman/listinfo/orca-list
> Orca wiki: https://wiki.gnome.org/Projects/Orca
> Orca documentation: https://help.gnome.org/users/orca/stable/
> GNOME Universal Access guide: https://help.gnome.org/users/gnome-help/stable/a11y.html
> Log bugs and feature requests at http://bugzilla.gnome.org