QMainWindow movable while maximized?

Qt 4.2.2, Windows XP (Home)

The following code produces a maximized window that can be moved by the user:

Code:

---

QMainWindow xyzzy;
	xyzzy.setWindowFlags(xyzzy.windowFlags() & ~(Qt::WindowMinimizeButtonHint | Qt::WindowMaximizeButtonHint));
	xyzzy.showMaximized();

---

If I remove the Qt::WindowMaximizeButtonHint from the above code, I get a maximized window that cannot be moved. I do not know the size of the desktop, nor if the task bar is displayed. I need the main window to take up all desktop space and not to be able to be moved around.

How about using QWidget::showFullScreen() ?

I still would like to have the title bar and the close button, and showFullScreen() gets rid of these.

I'm betting you're working in MSWindows.

Windows does this automatically. The underlying OS window style doesn't include a 'maximizeable' style, so certain behaviors are removed from the window. However, the underlying API doesn't prevent you from executing the 'maximize' operation. Since the window doesn't have a restore button on it (since it has no maximize button), I'm betting they decided that such a behavior was a Bad Thing -- so users can move the window.

You can work around this by injecting some Windows-specific code. (I've fixed exactly this bug in a commercial product... so I'm not sure if my employer will appreciate me giving the fix away. :P)

You'll need to modify how your window handles the WM_NCHITTEST message. To be complete, you should also try to customze the system menu for the window and the handing of WM_SYSCOMMAND events, since the user can still move the window via those options. There may be other holes, as well.

I haven't (yet) investigated if there are similar problems on X / Mac (my product also ships there, but only to a tiny fraction of our users compared to Windows).

Hope this helps.