I've finished a first small test application (a simple video player). You can find it under https://github.com/MaxPerl/pefl.maxperl
All in all, it works pretty well. However, there are a few limitations:
I haven't yet managed to get the Wayland engine from efl to work (I'm hoping for Mir 2.x). This may lead to suboptimal performance (especially at the moment no hw acceleration), but more importantly, to an error with rotation. In landscape mode there is a well known Issue with Xwayland: Inputs on the right side of the screen do not work in landscape mode (see also the problem in uWolf, fix could come when this is merged: https://gitlab.com/ubports/development/core/lomiri/-/merge_requests/207). I also can't resolve it through settings X-Lomiri-Rotates-Window-Contents=false and/or X-Lomiri-Supported-Orientations=portrait at the moment (see ubports/development/core/lomiri#184)
Maliit virtual keyboard does not work at the moment. Apparently, there’s also a way for Xwayland apps to integrate this via the DBus interface. But right now, that’s too complicated for me. In the meantime, I’ve programmed my own little virtual keyboard (though it’s not really necessary for a video player. You can test it in the file-open dialog at the search field. Works pretty well for me).
I’m currently working on a connection to the Content Hub (at least receiving data from other apps would be nice). But it doesn't seem that straightforward if an app doesn't use Qt or QML at all. I've already tried launching the app via Qt/QML instead of a Bash script, but apparently that doesn't work with Xwayland apps? If anyone here has experience with this, I'd appreciate any suggestions. Maybe I’ll start a separate thread regarding Content Hub as well. Surely that should work without Qt/QML????
Best wishes, Max