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Simplify CallbackRegistry pickling. #16219

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Merged
merged 1 commit into from
Mar 9, 2020
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anntzer
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@anntzer anntzer commented Jan 14, 2020

The deleted comment was really only relevant to Py2.
Preserving _cid_gen (which is picklable) is necessary to later enable
careful pickling of select callbacks, such as 3d mouse handlers (#10843)
(otherwise, the same cid may be assigned twice, one before pickling and
once after unpickling).

PR Summary

PR Checklist

  • Has Pytest style unit tests
  • Code is Flake 8 compliant
  • New features are documented, with examples if plot related
  • Documentation is sphinx and numpydoc compliant
  • Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
  • Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way

The deleted comment was really only relevant to Py2.
Preserving _cid_gen (which is picklable) is necessary to later enable
careful pickling of select callbacks, such as 3d mouse handlers
(otherwise, the same cid may be assigned twice, one before pickling and
once after unpickling).
@timhoffm timhoffm added this to the v3.3.0 milestone Mar 9, 2020
@timhoffm timhoffm merged commit 5407256 into matplotlib:master Mar 9, 2020
@anntzer anntzer deleted the crpickle branch March 9, 2020 13:21
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3 participants