Concurrent/Hierarchical states in State pattern and MVC pattern: Take two

Concurrent states in a state machine have behaviors that are independent of other states. For example, in a Flash video player, the “fullscreen” state is independent of “play”/”pause” states.

In a state machine, states have hierarchies. Some states that show relatedness of contexts can be grouped together; Child states are not accessible until their parent states are active. Theoretically, each set of concurrent states should have their own state manager. (In practice, if there is only two set of concurrent states, I find it just convenient to combine the two into one context object and have the base state includes interfaces that should be used by the other set of concurrent states. )

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