Get current language input layout

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From: SR_team <[email protected]>
To: [email protected]
Subject: Get current language input layout
Date: Sun, 19 Sep 2021 14:30:28 +0300
Message-ID: <34082489.jD8KFvFgHt@srpc>
Disposition-Notification-To: SR_team <[email protected]>

Hi, I can simply get current language input layout on X11 from XKB. It's work 
on all WM/DE, and it works on Wayland session via XWayland. But I want to get 
language input layout on Wayland natively, without XWayland. My target DE is 
KDE/Plasma. Can I get this information from KWin? May be in KWin exists 
universal interface for X11/Wayland sessions to get current language layout?

I'm looked documentation for KWindowSystem (https://api.kde.org/frameworks/
kwindowsystem/html/classKWindowSystem.html) and KWaylandServer (https://
api.kde.org/frameworks/kwayland/html/namespaceKWayland_1_1Server.html). In 
KWaylandServer I found KWaylandServer::InputMethodContextV1Interface, but I 
don't know how to get access to this interface.

Also, I tryied detect current platform and active window from KWindowSystem in 
my console app, but this always return is 0. Maybe it works only for window 
apps, but I want to write a daemon to switch led color on my keyboard, when 
language input layout is changed.

Thanks.
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