Qt override Title bar and menu bar?

I started on a project that I've been planning and I have a quick question.

I want to have as much screen space as possible. To do this I need to make the title bar thinner and I also want to have the menu bar hide until it is hovered over.

Is there a function that would allow be to quickly just shrink the title bar.

I'm pretty sure I need to use setMenuWidget() to create a custom menu bar, and then just add the labels, signals, and the other fun menu stuff. Am I right, is setMenuWidget() all I need beside the function that sets all of the labels and connections? Would 开发者_StackOverflowI have to create a variable in the class, or could I just create a function called setUpMenuBar()?

I tried to word this as well as I could. Sometimes my questions are a bit vague so if you clarity, just ask.

Thanks!

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Use full screen mode to get rid of the title bar. I think that would be much more user friendly than a nonstandard looking thin title bar.

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Whether or not you need a member variable for your custom menu bar widget depends only on your use of it. If all you do is create the menu, then no, you don't need to keep a member variable for it. "QMainWindow takes ownership of the menuBar pointer and deletes it at the appropriate time."

MyMainWindow::setUpMenuBar() {
    MyCustomMenuBar * menubar = new MyCustomMenuBar;
    // add all the menus
    setMenuWidget( menubar );
}  

You can even retrieve a pointer to menubar later:

MyCustomMenuBar * menubar = qobject_cast<MyCustomMenuBar *>( menuWidget() );

If you need this pointer more often, you can either override MyMainWindow::menuWidget() or save the pointer as a member.