QWindow and QMenuBar

[JonB]

@SPlatten
For the other part. There is void QLayout::setMenuBar(QWidget *widget)

Tells the geometry manager to place the menu bar widget at the top of parentWidget(), outside QWidget::contentsMargins(). All child widgets are placed below the bottom edge of the menu bar.

So can't you use that to put a QMenuBar on any QWidget. But a QWindow is a native window, not a widget, so not directly on that. Not sure you meant QWindow? You cannot replace a QWindow by a QMainWindow.

[SPlatten]

@JonB in my application I presently have one instance of QMainWindow and several instances of QWindow, although I set-up a QMenuBar and added QMenus to it, with QActions, the menu bar is not being displayed.

[SGaist]

@SPlatten as @JonB already wrote, a QWindow is not a QWidget hence you can't set a QMenuBar on it.

How did you implement that in your code ?

[SPlatten]

@SGaist , the autocomplete suggests the function setMenuBar and the compiler doesn't complain either, yet its just a QWindow.

[Christian Ehrlicher]

@SPlatten said in QWindow and QMenuBar:

and the compiler doesn't complain either, yet its just a QWindow.

Then its not a QWindow ...

[JonB]

@SPlatten said in QWindow and QMenuBar:

and the compiler doesn't complain either, yet its just a QWindow.

• Show your code rather than asserting this.
• From List of All Members for QWindow where is the setMenuBar() method?

It's best to check your facts when (several) others say something cannot be the case. :)

[SPlatten]

@JonB, @Christian-Ehrlicher , sorry, you are both correct, in trying to get something going I had messed up and the cast was to QMainWindow.

[JonB]

@SPlatten
:) [And I have appended a friendly smiley to my previous post.]
A QWindow is a wrapper for a ("low-level") native window on the platform. It is not a QWidget and cannot have something like a menubar or anything like that which a widget can have.

[SPlatten]

@JonB , is there any restriction on the number of instances of QMainWindow, can more than one instance of QMainWindow exist in the same application ?

[JonB]

@SPlatten
I did answer that: there is nothing special about QMainWindow, it is just a widget with the style/behaviour documented at https://doc.qt.io/qt-6/qmainwindow.html#details. You can have a hundred of them if you wish. Though personally I never understand why an application would want more than one main window, but never mind.

[SPlatten]

@JonB , the application I'm working on is not a specific application to do a job at all, its an engine that when finished will allow anyone to create a Qt application in JavaScript. The engine provides the Qt functionality, JavaScript and XML are used to create the application and subscriptions.

[mpergand]

@SPlatten
There is an option in QMenuBar that forces the menubar to be displayed in the window on Mac and some linux distros:

void setNativeMenuBar(bool nativeMenuBar)