On Mar 10, 4:24 am, Thomas Fritsch <i.dont.like.s...@invalid.com>
wrote:

-----------------------------------------
On a more conceptual note to make plug in development possible we use
design patterns such as the "factory pattern" and the "composite
pattern" look these up on wikipedia for details.

The basic idea is instead instead of hard coding anything you get it
at run time from external source.
e.g. If your program has a menu bar on the top you will create a
MenuBar factory class that reads the items that go in this bar from a
configuration file or some other permenant store. And in your event
handling code instead of making a big "if ...else if " clause you will
make generic call to a "Composite Menu Class." This class will already
have loaded event handlers for each item at start up and will call the
corect handler.

I hope this helps some what
regards
Usman Ismail