Examining Reactor Behavior in Detail

With a stack of scrap paper, start tracing the reactor events within the application. Here is an example of the kinds of things you should track:

Draw ten garden paths, then track the following Command/Object combinations, selecting the polylines in succession:

This exercise will give you a good understanding of what is happening behind the scenes. At any time throughout Lesson 7 when the reactor functionality becomes confusing, refer to your “reactor-trace sheets.”