It's actually even more complicated than that. There are, say, 5 different widget properties. (It's actually more like 20, and some aren't actually widget properties, but are based on widget properties.) Every widget will have a value for every property. The handlers trigger based on the values for the widget properties, not if the widget has a given property. So, I really need to have a way to ask a given handler if it needs to fire based on a given widget and the values for all the properties. And, the issue is how to maintain in a human-readable fashion all these mappings.
I do appreciate the fact that you've helped refine the problem for me. It's not about the architecture of triggering events and event handlers. It's really about how to make this system accessible by humans. I need to abstract out the complexity and put it in one place. The complexity is going to be there and I can't wish it away. What I need to do is concentrate it so that it's not spread throughout the code.
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