INTRODUCTION TO MIXINS
INTRODUCTION TO MIXINS
To extend the features of the EventDispatcher/EventQueue inheritance tree, code is injected using a mixin. EventDispatcher will be used as an example in this paper; EventQueue's functionality is identical. A mixins is a class created to add functionality to another class, typically by using a base class that already has the necessary capabilities.
The EventDispatcher's initial inheritance hierarchy looks like,
EventDispatcher <- EventDispatcherBase
After two mixin A and B are injected, the hierarchy looks like,
EventDispatcher <- MixinA <- MixinB <- EventDispatcherBase
All types, functions, and data (public and protected members) of EventDispatcherBase are accessible to mixins. The user can see and utilise every public member in the mixins.
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