Following the QT-API I got to make the custom style working putting it inside the correct folder and make the required modification from here. Now I have tried to use my own custom LAYOUT making the following modifications:
Modified its main.qml file from
...
Key { key: Qt.Key_Q text: "q" }
...
to
...
Key { key: Qt.Key_Q text: "w" }
...
to see if it changed when I open the keyboard.
Set the variable environment os.environ["QT_VIRTUALKEYBOARD_LAYOUT_PATH"] = ".../customkblayout"
These are all the variable environment I changed:
os.environ["QT5DIR"] = ".../Qt/5.8/gcc_64"
os.environ["QT_QPA_PLATFORM_PLUGIN_PATH"] = ".../Qt/5.8/gcc_64/plugins/platforms"
os.environ["QT_PLUGIN_PATH"] = ".../Qt/5.8/gcc_64/plugins"
os.environ["QML_IMPORT_PATH"] = ".../Qt/5.8/gcc_64/qml"
os.environ["QML2_IMPORT_PATH"] = ".../Qt/5.8/gcc_64/qml"
os.environ["QT_VIRTUALKEYBOARD_LAYOUT_PATH"] = ".../customkblayout"
os.environ["QT_VIRTUALKEYBOARD_STYLE"] = "custom"
os.environ["QT_IM_MODULE"] = "qtvirtualkeyboard"
Problem: When I open the qtvirtualkeyboard it seems that the variable environment is not working at all. It keeps the default layout that I don't even know where it's coming from. I even tried to modify the main.qml inside its own folder in .../en_GB and recompile it through QtCreator and nothing changes too.
Question: Is there any other variable I'm missing out? What am I doing wrong? Can't figure out how to change it and can't find anywhere how to do it more then I have already done.
Continuation of this question, where I tried to use style and already got this part, now only missing the Layout part.
Looking at your code, you are referencing Qt 5.8, but the QT_VIRTUALKEYBOARD_LAYOUT_PATH environment variable was added in Qt 5.9.
Please see the commit here tagged Qt 5.9: https://github.com/qt/qtvirtualkeyboard/commit/d51fd422289d8077ef23dd3b5f8d2df6827787b6
Hope that helps!