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Is there a way to auto-hide the OS X menu bar, like is possible with the Dock?

There was an application "Menufela" that did this for Tiger, but I'm not aware of anything similar for Leopard/Snow Leopard..

I'm almost certain this is (programatically) doable, because in full-screen applications the menu bar is hidden, and reappears when you mouse the mouse is at the top of the screen..

Edit: With the help of Steve Folly's answer, the following code:

[[NSApplication sharedApplication]
     setPresentationOptions:   NSApplicationPresentationAutoHideMenuBar
                             | NSApplicationPresentationAutoHideDock];

..will auto-hide the menubar (and the dock, as mandated by the API), but only for the current application:

When controlling or disabling features of Mac OS X system using SetSystemUIMode the requested behaviors are only in effect while the process which called SetSystemUIMode is frontmost

..close, but not quite there

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apple don't have a hide function available for menu bar, as I know – Am1rr3zA Oct 10 '09 at 19:15
There's no option in the System Preferences or wherever, but open a video in Quicktime Player X, make it full screen and move the mouse to the top of the screen. That's the behaviour I'd like, and I'm sure there is a way to trigger this globally (via a private Cocoa API or similar) – dbr Oct 10 '09 at 19:47
Perhaps this might be better at home over at Stack Overflow? – Jasarien Oct 10 '09 at 22:16
@Jasarien - possibly. Even though I gave an answer worthy of being on stackoverflow, I suspect dbr was looking for a way to do this via a preference or something similar. – Steve Folly Oct 11 '09 at 10:46
Asked a related question on SO:… – dbr Oct 11 '09 at 18:56
up vote 2 down vote accepted

MagicMenu it hides the menubar (and dock) per application and also finder if you wish

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That's pretty much exactly what I'm looking for! Only problem is, it modifies the Info.plist within the application bundle which means if used on official-Apple applications, they cannot access Keychain.. Many of the applications I use (Finder/Safari/Mail) would become quite annoying without keychain.. Ah well.. – dbr Nov 21 '09 at 23:55

Here's a good starting point: Technical Note TN2062 about Kiosk applications. But this article talks about it SetSystemUIMode being a Carbon API with no Cocoa equivalent.

However, digging a bit further, I found this article for Snow Leopard which describes NSApplication presentationOptions - the Cocoa replacement for SetSystemUIMode.

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It's not a replacement, it's a wrapper that calls it for you. – Hasaan Chop Nov 17 '09 at 7:11

Present Your Apps does it as well:

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Looks perfect, but does this work with the built-in applications that use the Keychain, like Mail? Sounds like it might modify the Info.plist which would make the integrity checks fail and mean Mail/etc couldn't use the Keychain, although I'm not sure – dbr Feb 23 '10 at 23:17
That might explain my Keychain troubles of late! – msutherl Feb 27 '10 at 20:02

Very simple, install Menu Eclipse.

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Does this autohide the bar, or dim it? Looks like v1 is a semitransparent overlay, although v2 looks like it autohides also – dbr Jan 9 '11 at 1:03

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