how to make python Qwidget for c++ QtMainWindow?

[giseladross]

You can embed a Python-based QWidget into a C++ QMainWindow by exposing the QMainWindow's addWidget function using Python bindings. This is typically done with PySide6 or PyQt6.

Steps:
1. Expose C++ functions to Python: Use Shiboken (for PySide6) or SIP (for PyQt6) to create bindings for QMainWindow’s addWidget function.
2. Embed Python in C++: Use CPython API (Py_Initialize(), PyImport_ImportModule(), etc.) to run Python code inside C++.
3. Create Python UI Components: Design QWidget in Python and expose it to C++.
4. Load Python Widgets in C++: Use the exposed functions to add Python-based QWidget dynamically.