QWindow and QMenuBar

SPlatten

Is there anyway to use QMenuBar with a QWindow?

I know a lot of functionality is wrapped into QMainWindow, is there a way to add this functionality to a QWindow?

Or can I create more than a single instance of QMainWindow in the same application?

JonB

@SPlatten said in QWindow and QMenuBar:

Or can I create more than a single instance of QMainWindow in the same application?

That bit you can certainly do. QMainWindow is just a widget with some style.

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)