MainWindow doesnt show MenuBar

[Vadik]

Created project with MainWindow shows only included Widget, but no MenuBar. Cant understand why, help me please.

Important Note: the same code works correctly on other machines, only on my computer it show wrong result.

The image demonstrate what i got instead of menu bar.

QMake version 3.0
Using Qt version 5.5.1
Ubuntu 16.04

Below mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtGui>
#include <QWidget>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
private:
    QMenu *file;
};

#endif // MAINWINDOW_H

Below mainwindow.cpp

#include "mainwindow.h"
#include <QtGui>
#include <QtWidgets>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    //QVBoxLayout *vbl = new QVBoxLayout;
    QMenu *file = new QMenu("&File"); //menuBar()->addMenu("&File");//new QMenu("&File");
    file->addAction("&Quit",qApp,SLOT(quit()),Qt::CTRL+Qt::Key_Q);


    QMenuBar *mb = menuBar();

    mb->addMenu(file);
    mb->show();
    setMenuBar(mb);

    //vbl->setMenuBar(mb);
    //setLayout(vbl);

    resize(400,400);
}

MainWindow::~MainWindow()
{

}

[Vadik]

@Vadik YEEEEAH, solved, after some investigations and reinstalling of all components it turned out. Need to change in 'System Settings -> Appearance -> Behavior' parameter for 'Show the menus for a window' from the "In the menu bar" to "In the window's title bar". Thanks to everyone who tried to help.

[medyakovvit]

@Vadik said in MainWindow doesnt show MenuBar:

mb->show();

vbl->setMenuBar(mb);

try to remove these lines

[Vadik]

This post is deleted!

[JonB]

@medyakovvit
Won't he need setMenuBar(sb) for his main window too?

[Vadik]

@medyakovvit Already tried this, and many of other combination "removing-adding". No one helps

[JonB]

@Vadik
So you've tried this?

QMenuBar *mb = menuBar();
mb->addMenu(file);
this->setMenuBar(mb);

Also see https://stackoverflow.com/questions/41367027/qt-add-menubar-menus-and-sub-menus-to-qmainwindow

[Vadik]

@JNBarchan said in MainWindow doesnt show MenuBar:

QMenuBar *mb = menuBar();
mb->addMenu(file);
this->setMenuBar(mb);

yes, have tried, and the same code is working on other machines.

[JonB]

@Vadik
Oh, this is the first time you're saying the code works on some machines and not others?

[Vadik]

@JNBarchan yeah, I just forgot, allready corrected. Thanks for reminder.

[JonB]

@Vadik
So I would look at exactly what version of Qt libraries is being used on your machine versus other machines? Maybe they have a later version than your 5.5, and it will work then?

[Vadik]

@JNBarchan Allready reinstalled Qt up to 5.9.2 version. And still didn't help

[SGaist]

Hi,

Aren't you on Ubuntu ? If so, isn't your menu bar shown at the top of the screen macOS like ?

[JonB]

@SGaist
LOL if that's what OP means. I have my desktop preference set to show menus on windows, but the default is on system menu.

[Vadik]

This post is deleted!

[Vadik]

@Vadik YEEEEAH, solved, after some investigations and reinstalling of all components it turned out. Need to change in 'System Settings -> Appearance -> Behavior' parameter for 'Show the menus for a window' from the "In the menu bar" to "In the window's title bar". Thanks to everyone who tried to help.

[medyakovvit]

@JNBarchan Question is solved, but as you asked.
I don't think it's needed as he gets pointer to menu bar with:

QMenuBar *mb = menuBar();

and this function returns the menu bar that already set.

[JonB]

@medyakovvit
Yeah, I kinda mis-read (C++ not being my language) it as having been:

QMenuBar *mb = new QMenuBar();

thinking he was creating his own new one which would need setting. Using the existing menubar and changing its content is of course preferable.