From: Joe Van Dyk <joevandyk@...>
Date: 2005-04-30T03:15:45+09:00
Subject: Re: method_missing question

On 4/29/05, Joe Van Dyk <joevandyk@gmail.com> wrote:
> On 4/29/05, Joe Van Dyk <joevandyk@gmail.com> wrote:
> > On 4/29/05, Rick Olson <technoweenie@gmail.com> wrote:
> > > Why not just call @display.zoom(500)?
> > >
> > > On 4/29/05, Joe Van Dyk <joevandyk@gmail.com> wrote:
> > > > Currently, I have a class that has a bunch of methods (that a GUI does
> > > > a callback on) that are like
> > > >
> > > >   def menu_zoom_100_activate
> > > >     @display.zoom(100)
> > > >   end
> > > >
> > > >   def menu_zoom_250_activate
> > > >     @display.zoom(250)
> > > >   end
> > > >
> > > >   def menu_zoom_500_activate
> > > >     @display.zoom(500)
> > > >   end
> > > >
> > > > Could I use #method_missing to make this better?
> > > >
> >
> > Because when a GUI button is clicked, I need to call a particular
> > method of a particular class.  I don't think I can give it an
> > argument.
> >
> 
> Actually, (I'm using Glade) I have this:
> 
> app_window = AppWindow.new
> GladeXML.new("app.glade") { |handler| app_window.method(handler) }
> 
> Where AppWindow is a class that contains all the methods that are
> defined in the glade file.  In the glade file are methods being
> registered like "menu_zoom_250_activate", "menu_zoom_500_activate" and
> so on.
> 
> If a particular method that's contained in the glade file isn't
> defined in the AppWindow class, I get a "undefined method '<some
> method>' for class AppWindow" upon the start of the application.
> 
> I added AppWindow#method_missing that just prints out the missing
> method, but that didn't seem to solve anything.
> 
> Perhaps it would be best to have a single method in AppWindow that
> took all the methods (as a string) that were defined in the glade file
> and executed the appropriate action?
> 
> So,
> 
> GladeXML.new("app.glade") { |handler| app_window.execute_method(handler) }
> 
> class AppWindow
>   def execute_method(method)
>     case method
>     when /menu_zoom_(\d+)_activate/
>       @display.zoom($1.to_i)
>     when "something_else"
>       # do something else
>     end
>   end
> end
> 

Nuts, I tried that, and AppWindow#execute_method is being run at
application start for each method defined in the glade file, and now
none of the GUI events do anything.  Hm.