FYI: What raise_event() returns when the number of event handlers != 1

Anvil Q&A
1

What I’m trying to do:
Plan intelligently for the case where event handlers are not unique.

When there is exactly one event handler, raise_event() returns what the handler returns.

What about when the number of handlers != 1? My tests indicate the following:

  • < 1? None.
  • > 1? The result from whichever handler was called last.

Edit 1: the latter suggests a possible extension: a version of raise_event that accumulates all results, as a list (in same order as get_event_handlers).

Edit 2: a version that yields one result at a time, so that we can act on the resulting values, possibly even skipping the remaining calls. (Example: a result that says “Event is officially handled. I’ve taken full responsibility for handling this occurrence.”)

Edit 3: D’oh! Now that we have get_event_handlers, we can write our own extended versions!

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