I'm not sure there is a simple way.
I went looking the last time I was doing serious work with callbacks, and
eventually just settled on wrapping them with my own custom classes that
could handle de-registration as needed.
The closest I could find was `MMessage.nodeCallbacks` which will return a
list of callbacks associated with a node, but that won't track things like
scene, ui, or other non-node based callbacks.
On Monday, April 23, 2018 at 10:06:17 PM UTC-5, Marcus Ottosson wrote:
>
> Hi all,
>
> With the Maya Python API (both 1.0 and 2.0) you can register callbacks,
> like so:
>
> from maya.api import OpenMaya as om
> om.MDGMessage.addTimeChangeCallback(...)
>
> It’ll hand you an ID you can later use to deregister it.
>
> def myCallback(time, clientData):
> pass
>
> eventId = om.MDGMessage.addTimeChangeCallback(myCallback, None)
> om.MMessage.removeCallback(eventId)
>
> But what do you do when you haven’t kept track of the ID? I’m debugging a
> potential leak of events being registered but not unregistered and am
> looking for something along the lines of..
>
> for func, eventId in om.MMessage.listCallbacks():
> print("EventID %d belongs to %s" % (func, eventId))
> # EventID 153 belongs to 'myCallback'
>
> I’m also curious about what events are registered per default and by
> third-party plug-ins or scripts and figure this would be an intuitive way
> of finding out.
>
> How can I list all currently registered events?
>
> Thanks,
> Marcus
>
>
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