I see what you did. The WidgetAction acts as a container handling the shortcut. It is similar to a custom widget.

As you said, it seems over complicated, so I will keep it simple for now, maybe by manually showing the shortcut in both actions, or in its parent.

@ChrisW67 Ok I understood... Thank you.

I think I found a solution
https://answers.microsoft.com/en-us/windows/forum/windows_10-files/windows-file-association-explained-for-desktop/cfa62c00-82e0-4d05-b302-3444ab930bb7
I understand windows xp and 7 ways but can someone help me win the new one?
and say if I can do this by code (I mean if I give someone my app, I want this to set automatically)

Right, I forgot that part.

The "workaround" is explained in the QKeySequence documentation linked from the QShortcut one.

Unfortunately, it doesn't seems to work... actions() returns me an empty list.

I think I'll go for QTextEdit::createMimeDataFromSelection() because otherwise I won't be able to deal with drag & drop (I didn't think about it :/ )

Thanks anyway!

I think you need to explicitly accept the event to trigger the override, as mentioned in the QKeyEvent doc.
Call "event->accept()" before "return true" may resolve your problem.

Well, I have a custom shortcut shC applied to Action/Menu which is global (in every window), but I can not register that into window A, or window B. I mean, I am on OS X, where there is only one menubar that is shared across the multiple windows, so I have to dispatch them, right?

I mean, for example, Qt Creator has a shortcut "Run" which is invokable from many windows. But I can not make two menubars and/or having two actions, right?

@Harry123
I did it putting this in main.cpp and that's all folks ;-)

QApplication a(argc, argv); a.setStyle("fusion");

Hi SGaist,

Thanks for your reply.

I don't think it caused by missing QWidget::addAction, because sometimes the shortcuts works well.
I've used the default shortcuts of widget(copy, paste and cut). It's strange that after the child window lunched the shortcuts don't work, but after click the Main window's menu bar(even the button in menu is disabled), the shortcuts works well. So i suspected whether there is the shortcut focus.

Yes, you are correct. There is more information here for anyone else interested:

https://bugreports.qt.io/browse/QTBUG-47701