Anywhere in your code you can call one of these functions or subscribe to one of these functions.

EventBus.dart

/* 
Basic implementation of an event bus in dart.
any function anywhere in code can subscribe themselves to specific methods in the event bus. such as:

EventBus.subscribe(eventBusFn, callbackFn)

to call an event bus function, and call any subscribing functions as well, run:

EventBus.call(eventBusFn, args)

*/
class EventBus {

  static Map<Function, Function> subscriptions = {};

  static void subscribe(Function fn, Function callbackFn){
    subscriptions[fn] = callbackFn;
  }

  static void call(Function fn){
    fn();
    if (subscriptions.containsKey(fn)){
      subscriptions[fn]!();
    }
  }
}
/*

Future improvements:

- Async function support
- Enforce that the function is in fact an EventBus function and not some arbitrary function
- Allow to subscribe and call functions with arguments
- Allow multiple functions to subscribe to the same EventBusFn

*/