no OSK in Plasma Mobile

[Heather Ellsworth]

On 03/20/2018 10:47 AM, Martin Flöser wrote:
> Am 2018-03-19 21:25, schrieb Heather Ellsworth:
>> On 03/17/2018 02:41 PM, Martin Flöser wrote:
>>>
>>>
>>> Am 17. März 2018 02:01:24 MEZ schrieb Heather Ellsworth
>>> <heather.ellsworth at puri.sm>:
>>>> On 03/15/2018 09:10 PM, Bhushan Shah wrote:
>>>>> Hello Heather,
>>>>>
>>>>> On Thu, Mar 15, 2018 at 06:57:27PM -0600, Heather Ellsworth wrote:
>>>>>> I've been running Plasma Mobile on my iMX6 dev board (precursor to
>>>> the
>>>>>> dev kit for the Librem 5) and I've notices there's no onscreen
>>>> keyboard.
>>>>>> Is it there and I'm just not initializing it? Or what is the story
>>>> with
>>>>>> the OSK in Plasma Mobile?
>>>>>
>>>>> For OSK, you just need to install qtvirtualkeyboard-plugin package,
>>>> it
>>>>> should give you working on-screen-keyboard for the Qt applications.
>>>> It
>>>>> is however possible that QtVirtualKeyboard is disabled by default if
>>>> you
>>>>> have keyboard attached. In that case you can enable it by clicking on
>>>>> virtualkeyboard icon in top drawer.
>>>>>
>>>>> You can also "export QT_VIRTUALKEYBOARD_STYLE=Plasma" for better
>>>> theming
>>>>> integration with Plasma Mobile.
>>>>
>>>> After installing qtvirtualkeyboard-plugin and exporting
>>>> QT_VIRTUALKEYBOARD_STYLE, we still do not see a keyboard icon in the
>>>> top
>>>> left of the Plasma Mobile desktop.
>>>>
>>>> Similarly, we do not see the icon after manually enabling the keyboard
>>>> with:
>>>>
>>>> $ qdbus org.kde.KWin /VirtualKeyboard
>>>> org.kde.kwin.VirtualKeyboard.enable
>>>>
>>>> However, after enabling the keyboard with the above qdbus command, we
>>>> see the keyboard pop up when a text field is clicked (like the search
>>>> bar, kwrite, konsole) but then the keyboard immediately goes away.
>>>>
>>>> Also in the lock screen, I see the virtual keyboard icon in the bottom
>>>> left. When I click it, the virtual keyboard appears and does not
>>>> disappear. Then I can type in the password (using Ctrl+Super to guide
>>>> my
>>>> mouse) to log back in.
>>>>
>>>> So the virtual keyboard works, but when in the desktop session the
>>>> keyboard goes away right after it appears. Any troubleshooting advice
>>>> you have would be helpful.
>>>>
>>>
>>> It might sound stupid, but just unplug the physical keyboard. Then it
>>> should work best. If the keyboard still hides, run the apps with
>>> WAYLAND_DEBUG=1 then we can see what's going on and why it hides. It
>>> should only hide if the application requests it and that's something
>>> we can see in the debug output.
>>>
>>
>> Thank you for the suggestion. It turns out that the issue was actually
>> setting the QT_IM_MODULE:
>>
>> $ export QT_IM_MODULE=qtvirtualkeyboard
>>
>> With this variable set, I see the keyboard come up and then disappear
>> when a text field is clicked. I was testing with this variable on
>> Friday. However with this variable unset, the keyboard seems to _stay
>> around_ and be usable when a text field is clicked. So the trick is to
>> not set this :)
> 
> Yes, that makes sense. If the env variable is set, Qt creates a window
> in the process. If the env variable is not set the wayland protocol is
> used and KWin can provide the virtual keyboard.
> 
> I think I also understand why it closed directly: when the window opens
> KWin passes it keyboard focus. Thus the text field which triggered the
> keyboard loses keyboard focus and closes the keyboard again.

Ok thanks for explaining!

It's also worth mentioning that the keyboard looks nicer with
QT_VIRTUALKEYBOARD_STYLE=Plasma set before launching kwin_wayland.

Cheers,
Heather


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