Use sublassed QMenuBar as menuBar()

westernCiv

Hey there
I sublassed a QMenuBar:

// mainmenu.cpp
#include "mainmenu.h"

Mainmenu::Mainmenu(QWidget *parent) : QMenuBar(parent){

    ...
}

//mainmenu.h
#include <QWidget>
#include <QMenuBar>

class Mainmenu : public QMenuBar{
    
    Q_OBJECT

    public:
        
        Mainmenu(QWidget *parent = 0);
};

Then I try to use it in a QMainWindow:

//mainwindow.h
#include <QMainWindow>
#include <QMenuBar>
...
#include "mainmenu.h"

class Mainwindow : public QMainWindow {
    
    Q_OBJECT  

    public:
    
        Mainwindow(QWidget *parent = 0);
        
    private slots:
        ...
    private:
        ...
        Mainmenu *menu;
};


//mainwindow.cpp

#include "mainwindow.h"
#include <QVBoxLayout>
#include <QMenu>
#include <QAction>

Mainwindow::Mainwindow(QWidget *parent) : QMainWindow(parent){
    ...
    menu = new Mainmenu(this);
    menu = menuBar();
    ...
}

But I get this error when compiling:

../sources/mainwindow.cpp: In constructor ‘Mainwindow::Mainwindow(QWidget*)’:
../sources/mainwindow.cpp:16:19: error: invalid conversion from ‘QMenuBar*’ to ‘Mainmenu*’ [-fpermissive]
     menu = menuBar();
            ~~~~~~~^~
make: *** [Makefile:246: object/mainwindow.o] Error 1

And I'm not sure what I'm doing wrong
I want to subclass the menu because it is large (lots of actions/submenus etc),
and I want to use menuBar() because it is layout-independent

VRonin

menuBar() is the getter, use setMenuBar as setter

This is a standard pattern in Qt (and C++ in general) methods where you have a method that gets the value and another that sets it