Updating schema.choice values

Plone Support Add-on Development
1

In Plone 6 ClassicUI, I have a schema.Choice field with options defined in its "values" property. Is it possible to update the available options depending on the context?

I have looked at Field and Widget instances of my field and I have not found a way to update it. I inspected the field while in p.a.z3cform updateFields and updateWidgets methods.

class IMyForm(model.Schema):
 
    ...

    myfield = schema.Choice(
        title="My Field",
        values=("One", "Two"),
        required=True
    )
2

https://training.plone.org/mastering-plone/registry.html#vocabularies-label
http://garbas.github.io/plone-z3c.form-tutorial/vocabularies.html

You can define vocabularies, the values can be dynamic.

3

Thanks. I ended up using IContextSourceBinder.