@Christian-Ehrlicher said in Widget from scratch using pImpl, how to Q_PRIVATE_SLOT?:

As I said the pmf syntax needs a QObject as sender and receiver.

Ah sorry, while I was editing my example code I missed your reply :)

Oh wow didn't know that :0
So the ( SIGNAL(), SLOT() ) connection stuff is not 100% identical in terms of use-case and compatibility with the Functor-based connections?
Good to know.

@Christian-Ehrlicher said in Widget from scratch using pImpl, how to Q_PRIVATE_SLOT?:

Maybe you can also take a look on QObjectPrivate::connect() in qobject_p.h (when someone asks - I don't know this function... 🙂)

Yeah, I checked the Qt Private sources here and there while I was building my widget to see how it's done. Haven't seen this exact part, but will visit it again ;-)
Since I don't want to include the Qt Private source completely (which would make my widget highly dependent on a single Qt version), I made my own WidgetPrivate based on QWidgetPrivate "style" but without inheriting it... so no QObjectData, QObjectPrivate and whatnot... for me ;-)

Edit:

@Christian-Ehrlicher said in Widget from scratch using pImpl, how to Q_PRIVATE_SLOT?:

Maybe you can also take a look on QObjectPrivate::connect() in qobject_p.h (when someone asks - I don't know this function... 🙂)

This function?
What is there to see? Other than QObjectPrivate::connect.
You mean the use of two QObject Functors?

when someone asks - I don't know this function

Nobody will know 🤐

One way is to derive the private class from QObject or use a lambda.

If one way to make it work is using the SIGNAL / SLOT keywords again, I will probably try it.
Tried lambda, did not work either :/ Or maybe I was doing something wrong.

Edit_II:

I made my actual code work, using String-based connections while I moved the connect statement to the WidgetPrivate::init() function and hid the QTimer also behind the WidgetPrivate data.
Not 100% pleased, tho :D
Is it a good idea to make the Impl class a QObject?!
What's your recommendation?

@SGaist oh lol even missed your comment too :D Was about to add the code anyway :)