How is a focusless QDockWidget implemented?

Question

Qt

There is a Qt5 application that uses a QMainWindow and a ton of QDockWidgets as auxiliary toolbars and settings windows.
Question: how to make them non-activated, i.e. To keep focus on the main window? Like, for example, the palette in Paint.NET: no matter how much you poke and drag it, the focus remains on the main window.
Each widget is a separate class, so there is no difficulty in adding and changing them (For example, substituting virtual functions).
I myself work on Windows but at the same time debug the same code under Linux (CentOS, Debian and Mint) and Mac.

Answer 1

Watson, well, watson ....
We take QMainWindow and filter QFocusEvent, setting a filter or overriding the appropriate method