Nested containers

[ndxmrb]

Hi @tlambert03,
restarting my work from #669 after the ValuedContainer changes.

Still, some things are missing:

• Proper test e.g. for getting nested values from ValueWidgets and ContainerWidgets. Does this belong to test_pydantic()in test_ui_field.py?
• QGroupBox option as mentioned in Improve nesting of containers with labels (group box) #317

Tried my best with the types again, hope it's okay that way.

Thanks for having a look!

[codecov]

Codecov Report

❌ Patch coverage is 94.17476% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.32%. Comparing base (17ec0d8) to head (89f2972).

Files with missing lines	Patch %	Lines
src/magicgui/schema/_ui_field.py	85.71%	4 Missing ⚠️
src/magicgui/widgets/_concrete.py	96.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #704      +/-   ##
==========================================
+ Coverage   89.27%   89.32%   +0.04%     
==========================================
  Files          40       40              
  Lines        4820     4889      +69     
==========================================
+ Hits         4303     4367      +64     
- Misses        517      522       +5     

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[tlambert03]

hey @ndxmrb

so sorry for the long delay. couple concerns about typing and error catching. we don't need to belabor them too much, if you can fix great, otherwise let me know.

[tlambert03]

@ndxmrb, I made some significant changes to this PR. The main thing that was holding me back here was the return type of create_widget (up here) ... it broke the clean pattern of having all UIFields returning a widget where you could be certain to query .value ... (though i recognize you were doing the least changes necessary to get the desired functionality). I made a proper ModelContainerWidget, which is essentially the concrete version of a ValuedContainerWidget (and is a widget specifically made for dataclass-like objects). It implements the proper interface to retain consistency with the previous pattern. Please have a last look if you're able/willing.

I know it's been so long so you might have forgotten/lost interest by now. So I'll give this a week or so before merging