Spell checking in PyQtWebEngine

I am writing a program which is mainly in python but some interactive features are done through a web-app that talks to flask. It would be nice to have the web-app inside the python program so I am looking at using PyQtWebEngine.

This works surprisingly well except that I cannot get spell checking to work. I have run

self.page().profile().setSpellCheckEnabled(True)
self.page().profile().setSpellCheckLanguages({"en-GB"})

from inside my child class of QWebEngineView, and I have checked isSpellCheckEnabled() is True.

I wonder if it cannot find the languages. No qWarning is detected which I would expect if it cannot find the dictionary. As suggested by the non-python example.

I have an en-GB.bdic which I copied from the Chromium hunspell git. I have tried putting the file at:

<directory_my_py_file_is_in>/qtwebengine_dictionaries/en-GB.bdic

When I run

app = QApplication(sys.argv)
print(app.applicationDirPath())

the result is

/usr/bin

so I tried

/usr/bin/qtwebengine_dictionaries/en-GB.bdic

This wouldn't have been OK because I cannot edit this location when the program is pip installed, but it was worth a try.

With the .bdic file in either place I never see any spell check feature.

Has anyone got spellchecking working in PyQtWebEngine? I have not been able to find much in the way of documentation.

Solution

Assuming that the .bdic are valid then I have established the path of the dictionaries through the environment variable QTWEBENGINE_DICTIONARIES_PATH, for example I have translated the official example into python with the following structure:

├── data
│   ├── icon.svg
│   ├── index.html
│   ├── spellchecker.qrc
│   └── style.css
├── dict
│   ├── de
│   │   ├── de-DE.aff
│   │   ├── de-DE.dic
│   │   └── README.txt
│   └── en
│       ├── en-US.aff
│       ├── en-US.dic
│       └── README.txt
├── main.py
├── spellchecker_rc.py
├── qtwebengine_dictionaries
│   ├── de-DE.bdic
│   └── en-US.bdic
└── README.md

main.py

# ...
CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))
os.environ["QTWEBENGINE_DICTIONARIES_PATH"] = os.path.join(
    CURRENT_DIR, "qtwebengine_dictionaries"
)
# ...

Note: To get the bdic I have used the qwebengine_convert_dict tool executing:

qwebengine_convert_dict dict/en/en-US.dic qtwebengine_dictionaries/en-US.bdic
qwebengine_convert_dict dict/de/de-DE.dic qtwebengine_dictionaries/de-DE.bdic

_{The complete code is here.}