Re: Newbie question -> Observer pattern

iso8859-1@[EMAIL PROTECTED]
 wrote:

> for a GUI I want the View/Controller to observe the Model. The
> View/Controller registers at the Model as observer. I guess there is an
> easy way to get this functionality in ISE Eiffel - for example by
> inheriting from the correct class - but I don't know which one. Can
> someone point me in the right direction?

If you are using EiffelVision 2, use the action lists associated with the
Widgets.

For example,
     b: EV_BUTTON

         -- Initialisation code fragment
     ...
     button.select_actions.extend(agent set_me(button))
     ...
         set_me(b: EV_TOGGLE_BUTTON) is
                  --
             do
             end
-- 
Peter Horan               School of Engineering and Information Technology
peter@[EMAIL PROTECTED]
       Deakin University
+61-3-5227 1234 (Voice)   Geelong, Victoria 3217, AUSTRALIA
+61-3-5227 2028 (FAX)     http://www.eit.deakin.edu.au/~peter

-- The Eiffel guarantee: From specification to implementation
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