: collapse/ expanded /expandable state of tree views in QT4/ QT5 applications

Wed Oct 17 21:56:27 BST 2018

Howdy,

Just for your information, i reported this issue here if someone wants  
to make additional information:

https://bugreports.qt.io/browse/QTBUG-71223

Cheers chrys

Zitat von chrys at linux-a11y.org:

> Howdy Joanie,
>
> i will forward your message to KDE accessibility list.
> Thanks for the detailed issue analyse. i open an bug for QT here and  
> append your mail to this.
>
> cheers chrys
>
> Zitat von Joanmarie Diggs <jdiggs at 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 at 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 at igalia.com>
>>>> -----
>>>>   Datum: Wed, 17 Oct 2018 09:52:26 +0200
>>>>     Von: Joanmarie Diggs <jdiggs at igalia.com>
>>>> Betreff: Re: [orca-list] collapse/ expanded /expandable state of tree
>>>> views in QT4/ QT5 applications
>>>>      An: chrys <chrys at linux-a11y.org>
>>>>      Cc: orca-list <orca-list at 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 at 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 at 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 at 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 at 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