[Differential] [Request, 123 lines] D4220: Add a basic SNI for keyboard layout

[Martin Gräßlin]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma on Wayland.
Restricted Application added subscribers: kwin, plasma-devel.
Restricted Application added projects: Plasma on Wayland, KWin.

REVISION SUMMARY
  On X11 the SNI for keyboard layout is provided by the keyboard kded.
  On Wayland that kded has no real access to the layouts and cannot
  properly implement switching. Given that it's better to integrate the
  SNI directly in KWin.
  
  The implementation of the SNI is largly based on the existing SNI from
  plasma-desktop/kcms/keyboard. The implementation so far supports:
  
  - Switching to next layout on toggle
  - Presenting all layouts in a context menu
  - Switching to a specific layout through the context menu
  - Opening the keyboard layout configuration module
  
  Not yet supported are:
  
  - config option whether to show the SNI
  - scroll on SNI
  - flags and/or short text for the layouts
  
  The last point needs more explanation. On X11 the layout name is
  something like "de" or "us". This can be directly mapped to a flag and
  can be added as a short note.
  
  Xkbcommon does not provide this information directly. Instead it provides
  us the full name of the layout, e.g. "German" or "English (us)". There is
  no way in the API to go from "German" to "de".
  
  Instead we need to parse the evdev.xml file to gather all information
  about layouts. This is already done in the keyboard kcm to configure
  layouts. The implementation needs to be split out into a small helper
  library.

REPOSITORY
  R108 KWin

BRANCH
  keyboard-layout-sni

REVISION DETAIL
  https://phabricator.kde.org/D4220

AFFECTED FILES
  keyboard_input.cpp
  keyboard_input.h
  keyboard_layout.cpp
  keyboard_layout.h

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: graesslin, #kwin, #plasma_on_wayland
Cc: plasma-devel, kwin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, eliasp, sebas
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