[fxruby-users] How do I grey out or hide menu items.

[Lyle Johnson]

On Mar 7, 2008, at 8:55 AM, datatec wrote:

> I see from a lot of places that:
> Menu commands may reflect the state of the application by graying  
> out or
> becoming hidden.
>
> But how exactly would I do that?

The standard way to do this is to catch the SEL_UPDATE message that  
the menu command button sends to its target.

> So for example
> Here I have a command that I do not want enabled until changes have  
> been
> made to a document
>
>  savefile=FXMenuCommand.new(filemenu, "&Save\tCtl-S\tSave the
> file.").connect(SEL_COMMAND) {
>    filesave
>    }
>
> how could I set this to greyed out  and/or  hidden?

Here's what I'd do:

	savefile.connect(SEL_UPDATE) do |sender, sel, data|
		if document.changed?
			sender.enable
		else
			sender.disable
		end
	end

> General question. I can seem to find a lot of API and CLASS stuff but
> documentation of simple things like the above seem to be missing.   
> Am I just
> looking in the wrong place?

There's a good bit of free documentation at the FOX web site (http://www.fox-toolkit.org/ 
), and although it's geared toward users of the C++ FOX library, you  
may be able to get a lot out of it. The best source for in-depth,  
tutorial-style documentation of FXRuby is the new FXRuby book (see my  
sig for details).

Hope this helps,

Lyle

---
"FXRuby: Create Lean and Mean GUIs with Ruby"
Now available as a Beta book from the Pragmatic Bookshelf
http://www.pragprog.com/titles/fxruby