Question

I have an application in flex, it has some components out of the box and quite a few of custom components and events.

I want to get all event listeners on a specific component in runtime, I know how to do it with monkey-patching the framework but I do not want to use a monkey patch nor can I rely on this in production.

Is there a way?

Answer 1

The EventDispatcher has a pretty slim public interface:

• addEventListener
• dispatchEvent
• hasEventListener
• removeEventListener
• willTrigger

This means the list of listeners isn’t exposed. You can only tell if there is at least one event listener for a particular type of event.

I would re-examine why you need to do what you want to do. In a typical Observer Pattern the listener list isn’t meant to be exposed. I have a strong feeling if you are trying to get that list then you are approaching a higher level problem from the wrong direction.