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Plugins can go far beyond the intended use of handling events. If we utilize plugins
to our advantage, we can create modular extensions.
Extension Design
Over and above the design issues we have discussed in the previous three chapters,
there are additional design elements to consider when building extensions. This
chapter explains some of the other design elements, common to all extensions, which
we have not yet covered.
Supporting Classes
In the last three chapters, we have discussed the creation of subclasses from some
of the core classes. In addition to these classes, we may want to define our own
unique classes.
The MVC is a very good pattern for creating systems quickly and easily. However, it
is not, nor is it intended to be, all encompassing.
Unsurprisingly, many components contain supporting classes. The core
component that deals with menus is a prime example. This component defines
two additional classes, iLink and iLinkNode. A tree representation of a menu is
built using these classes.


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