It’s rare, but it happens. Sometimes you absolutely need to extend a class, and that class does not already extend EventDispatcher. At the same time, you absolutely need your class to be an EventDispatcher. Because ActionScript 3 does not allow multiple inheritance, how do you reconcile this?
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For this chapter of AS3 101, we will be diving into the mechanics of the Flash event system. If you’ve been following along so far, you’ll have seen events in use, dating all the way back to the first episode of the series. The editor and I felt that it was time to write up something to be formally included in the curriculum, so if you’ve ever seen those lines of code about adding event listeners or dispatching events, and not quite caught on, then this is the tutorial for you.
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After many months of learning how to program from the ground up, you’re ready to put it all to use: we’re going to build a simple drawing application. We will focus on Object-Oriented Programming techniques, specifically the use of interfaces. By setting up a few rules for our programming, we will make expanding the feature-set and debugging the project much easier.
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