Advice about my application's structure please

Question

My applications usually have the following structure
A top level main application and multiple child components all having a singleton for global varaibles.
I usually add listeners to the main to listen to events from the components and then do stuff. I was thinking, mayby it would be better to fire the events from the singleton instead and add listenerers to the componetns instead of the main app. This would allow the main application not the need to know what methods to call from the varius components if it hears an event?
What do you think?

Answer 1

Its usually best to keep components self-contained so they can take care of themselves, better for reuse.
That said, MVC is a powerful architecture, and to use a simple MVC pattern with custom events, see my Flex cookbook post on the topic:
http://www.adobe.com/cfusion/communityengine/index.cfm?event=showdetails&productId=2&postI d=11246
Later you could use a more formalized MVC architecture, like Mate, PureMVC, or Cairngorn:
http://www.asfusion.com/blog/entry/mate-flex-framework-in-public-alpha
http://puremvc.org/
http://opensource.adobe.com/wiki/display/cairngorm/Cairngorm;jsessionid=54025FEE98DFA8FA07 66E808EAA5285F
If this post answers your question or helps, please mark it as such.