Types of events
There are several different types of events in MPF, including:
You can find the details of how to use each of these events by reading through the API documentation for the event manager, but here's a quick overview.
Video about events in MPF:
The basic event is a simple event with a name (and possibly keyword argument pairs) that is posted.
The event manager will call the registered handlers one-by-one in the order of their priority (from when they registered).
Queue events are similar to basic events, except that the event won't actually finish until all the handlers say it's ok to do so.
The game_ending event is an example of a queue event. When the game is over, game_ending is posted, and when that's done, game_ended is posted and the attract mode starts again. However there are several modes that might want to "block" the completion of game_ending until they can do whatever they need to do. For example, if match is enabled, it will want to block game_ending until it can run the match animation. If a player has achieved a high score, the high score mode will want to block game ending, etc.
Note for Programmers
If you're a programmer and familiar with Python, you'll notice in the source code that there are more types of events than just basic and queue events. The basic and queue events are the only ones that are exposed via config files, but you'll notice there are boolean and relay events, and that there are asynchronous versions of all events too. See the API reference for details.
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