I think in Qt there do not need the microkernel architecture.

The text description sounds like a QMdiArea

@markleo
For IPC you have shared memory, TCP sockets, named pipes, for parent/child processes stdin/stdout, or specifically Qt Remote Objects. All available from Qt and Python.

No, you have to create that manually.

@markleo
https://qfluentwidgets.com/pages/designer/
I cannot imagine that Qt Designer would document, explain or tutorial on that third-party app, it would be up to the third-party to do so, as per the link.

I fond it by :

% find /opt/anaconda3/ -name "Designer.app"
/opt/anaconda3//pkgs/qt6-main-6.7.3-h2fbab7f_1/lib/qt6/bin/Designer.app

@markleo said in Is there any PyQt demos examples of architecture for modular design of large projects?:

Does PyQt have similar sample schemes that can be borrowed?

These are the official PySide Qt examples

https://doc.qt.io/qtforpython-6/examples/index.html

and here are some PyQt GitHub examples:

https://github.com/pyqt/examples

@markleo said in For large Qt desktop projects, how is the database generally used in combination?:

Since large databases such as MySQL and PostgreSQL need to be installed on a PC

Those are typically installed on a server and clients access that server. It would be unusual to install such SQL servers on users machines.

Whether SQLite is sufficient or not really depends on your needs. It is, for example, not designed to be accessed in parallel by several applications at the same time. So, what are your requirements? Are your clients going to access same databases? If so, you should consider client/server architecture using MySQL/PostgreSQL.

@markleo
As @Pl45m4 has said. PyQt and PySide are so similar that there is no reason why you should not create a PySide project and then just substitute PyQt for PySide everywhere it occurs. Plus project templates are really only a couple of files and lines of code, once you've seen one you are not missing out if you just write/copy in the few lines.

@markleo said in Hi, how to use Qt Designer on macOS?:

I don't find a button called "Design"

Please look again: it is right there on the left side. It is greyed out because you do not have an ui file yet.

Hi and thanks for your welcome.
Good question, I'm trying to create Qt bindings for Ada language.
Some attempts with C++ were failing due to some C++ subtleties.
But Python provides C API which I can used easily with Ada.
I provide some very first Qt bindings for Ada.
But class inheritance is still in Python.
I wanted to make them full Ada. I'm able to instantiate a class inherited from QRasterWindow (for instance) but a call to the method metric (for instance) provoques a seg fault.
(for simplicity I post the code in C)

Hi,

It seems you would need an item on top of your images that you would paint transparently and then use something like QPainterPath to create the shape for your selection. The QGraphicsPathItem might be enough for your needs.

Hope it helps

@Pl45m4 OK, I will study it further, Thank you for your help.

Got the window flashing removed when the app exits. I changed

animation.finished.connect (window.close)

to call a function of mine that does the window.close (). When I added a time.sleep (1) after the window.close, it stops that behavior. So it appears qt needs more time when it is cleaning up the window, and when you prematurely interrupt it (with an application exit...), the window repaints for an instant.

AND: you don't need to set an initial opacity of 0...

@SGaist thank you for your help,
QApplication.setStyle(QStyleFactory.create('windowsvista')) is effective

@JonB said in How can I release a pdf document for use again after it has been used with QPdfView in PyQt?:

self.pdf = None self.document = None

self.pdf = None gets rid of self.pdf.document. self.document = None is necessary because you have self.document = QPdfDocument().