15 Mar 2010

Building a menu of delegates and enums

I like delegates. I also like enums. Furthermore, I happen to be part of a small group of people who actually enjoy the immediate mode GUI system in Unity. And I want you to like it too :)

So – menus. After having observed quite a few very funky approaches, in the IRC channel, to building main menu functionality and giving advice in there, I decided to sow together those ideas into a short example.

The main idea here is to be able to build and manage a menu system quickly and easily. This line adds a new submenu to the system – designated MyMenuState and implemented in the OnMyMenuGUI method:

Notice that since we’re using delegates, the GUI method needn’t be implemented in the same script and could even live on an entirely different GameObject. Why is this so clever (besides enums and delegates being cool)? Because managing and switching between menus set up like this is insanely easy. This is the central GUI method for the menu system:

And this is GUI code inside a menu GUI method for switching to a different submenu:

So there. Enough talk. Have some example code:

Example project: Menu.zip – built with Unity 2.6.1

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