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Thread: QMenuBar doesn't show up properly

  1. #1
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    Default QMenuBar doesn't show up properly

    Hello!

    I have a problem with a QMenuBar. It doesn't show up properly. Instead of all the QMenu and QAction inside it, it only shows a ">>" symbol like this:
    menu.jpg

    I can press the symbol and a menu of menus shows up and everything works fine. But this is still a problem. I tried playing around with the size of the widget the QMenuBar is inside, removed all relevant style sheet entries and reduced the contents of the QMenuBar to a single QMenu with one QAction inside. Nothing helps. This happens only on one of two PCs where I tested it (Win XP does not work, Win7 works). The code to produce the menu looks like this:

    Qt Code:
    1. // Build the menu bar.
    2. QMenuBar* menuBar = new QMenuBar();
    3. QHBoxLayout* menuLayout = new QHBoxLayout(ui.menuWidget);
    4. menuLayout->setMargin(0);
    5. menuLayout->addWidget(menuBar);
    6. menuLayout->addStretch(1);
    7. ui.menuWidget->setLayout(menuLayout);
    8.  
    9. QMenu* fileMenu = menuBar->addMenu(tr("&File"));
    10.  
    11. QAction* saveStateAction = fileMenu->addAction(tr("&Save State"));
    12. saveStateAction->setToolTip(tr("Saves the state history."));
    13. saveStateAction->setShortcut(QKeySequence(tr("Ctrl+S")));
    14. connect(saveStateAction, SIGNAL(triggered()), this, SLOT(saveStateHistory()));
    15.  
    16. // ...and more QMenus and QActions follow.
    To copy to clipboard, switch view to plain text mode 


    Any advice?

    thanks,
    Cruz

  2. #2
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    Default Re: QMenuBar doesn't show up properly

    If you want a menu bar, maybe you could use QMainWindow instead? It already has a menu bar and proper layout to handle it.

    Cheers,
    _

  3. #3
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    Default Re: QMenuBar doesn't show up properly

    I guess I could figure it out. I would want to hide() away the tool bars and the status bar. And I'm using designer to create the gui. Would I just design the central widget and then call ui.setupUi(centralWidget()) in the ctor of the QMainWindow? But even if I do this, the problem described above remains unsolved.


    Added after 13 minutes:


    Quote Originally Posted by Cruz View Post
    and then call ui.setupUi(centralWidget()) in the ctor of the QMainWindow?
    No, this doesn't work. I get a segfault right after start. I suppose the central widget doesn't exist yet. So if using a QMainWindow, how do I manage to apply my designed ui to the central widget?
    Last edited by Cruz; 19th February 2014 at 13:54.

  4. #4
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    Default Re: QMenuBar doesn't show up properly

    If you have your widget in designer, you probably have a class that does with it, right?

    Just create an instance of that class and set it on the main window using QMainWindow::setCentralWidget()

    You can alternatively create the whole main window in designer, then the code stays
    Qt Code:
    1. ui->setupUi(this);
    To copy to clipboard, switch view to plain text mode 

    Cheers,
    _

  5. #5
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    Default Re: QMenuBar doesn't show up properly

    Ok yes I could reuse the class I already have for the ui, but then I would separate out half of my gui into a main windows class, where I set up the toolbar and link the central widget, and the other half would remain in my "old" QWidget that currently does it all. I would not like this separation.

    The second alternative of designing the whole main windows sort of defeats the purpose of using a QMainWindow, because I would just replace what's already been set up automatically and most likely run into the very same problem I described above.

    Before taking the bullet and going with option one, isn't there an explanation + solution for the problem why the menu bar doesn't show up right?

    Like this it works perfectly:

    Qt Code:
    1. MyWindow::MyWindow(QWidget *parent)
    2. : QMainWindow(parent)
    3. {
    4. QWidget* cw = new QWidget();
    5. ui.setupUi(cw);
    6. setCentralWidget(cw);
    7.  
    8. QMenuBar* menuBar = new QMenuBar();
    9. setMenuBar(menuBar);
    10.  
    11. QMenu* fileMenu = menuBar->addMenu(tr("&File"));
    12.  
    13. QAction* saveStateAction = fileMenu->addAction(tr("&Save State"));
    14. saveStateAction->setToolTip(tr("Saves the state history."));
    15. saveStateAction->setShortcut(QKeySequence(tr("Ctrl+S")));
    16. connect(saveStateAction, SIGNAL(triggered()), this, SLOT(saveStateHistory()));
    17.  
    18. [...]
    19. }
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    Last edited by Cruz; 19th February 2014 at 15:49.

  6. #6
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    Default Re: QMenuBar doesn't show up properly

    Quote Originally Posted by Cruz View Post
    Ok yes I could reuse the class I already have for the ui, but then I would separate out half of my gui into a main windows class, where I set up the toolbar and link the central widget, and the other half would remain in my "old" QWidget that currently does it all. I would not like this separation.
    Not necessarily. You could just use your widget and pass in the menu bar or create a menu bar in your widget and set it as the main window's menu bar.

    Quote Originally Posted by Cruz View Post
    The second alternative of designing the whole main windows sort of defeats the purpose of using a QMainWindow, because I would just replace what's already been set up automatically and most likely run into the very same problem I described above.
    Well, I would have just copied the contents of your widget in designer into a QMainWindow based designer form and the code into the main window class.
    There would be no "replacing".

    Quote Originally Posted by Cruz View Post
    Before taking the bullet and going with option one, isn't there an explanation + solution for the problem why the menu bar doesn't show up right?
    You could try a couple of things:
    1) not adding a stretch
    2) setting the menu bar's horizontal size policy to expanding
    3) check that your ui.menuWidget is in a layout and that it spans the whole width of the window

    Cheers,
    _

  7. The following user says thank you to anda_skoa for this useful post:

    Cruz (20th February 2014)

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