Yea, I wasn't aware of anything that would give you a list like this. I
always considered the ids the same as raw pointers. Basically, don't leak
them :-)
I like the idea Robert has of wrapping the ids into "smart" ids as in the
vein of RAII
<https://en.wikipedia.org/wiki/Resource_acquisition_is_initialization>
Shot in the dark, but maybe they don't expose a way to list the ids for the
reason that it would give people a chance to muck with other registered
callback? But, even if you could get a list of ids, what would you do with
them? Callbacks can be registered by both C++ and Python, which means the
callbacks would end up being opaque pointers to the caller.
Justin
On Tue, Apr 24, 2018 at 4:20 PM Robert White <robert.wd.wh...@gmail.com>
wrote:
> 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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