Preserve Full Trajectory Information in AnalysisBase

[yuxuanzhuang]

Fixes #4891

Changes made in this Pull Request:

• Add self._global_slicer to retrieve global details such as the total number of frames.
• Add self._global_frame_index for _single_frame to track the global frame index for each frame

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

Developers certificate of origin

• I certify that this contribution is covered by the LGPLv2.1+ license as defined in our LICENSE and adheres to the Developer Certificate of Origin.

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📚 Documentation preview 📚: https://mdanalysis--4892.org.readthedocs.build/en/4892/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.63%. Comparing base (6842fd7) to head (2c9982b).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4892      +/-   ##
===========================================
- Coverage    93.65%   93.63%   -0.03%     
===========================================
  Files          177      189      +12     
  Lines        21795    22863    +1068     
  Branches      3067     3067              
===========================================
+ Hits         20413    21408     +995     
- Misses         931     1004      +73     
  Partials       451      451              

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[pep8speaks]

Hello @yuxuanzhuang! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2025-01-14 18:49:12 UTC

[yuxuanzhuang]

I’m not certain that _global_xxx is the most suitable naming convention for these attributes. I’d appreciate any alternative suggestions you might have.