So, thanks to Carsten, I have the following patterns working:
To override the templates for all occurrences of a widget class in a
given view:
<z3c:widgetTemplate
mode="display"
widget="widget.package.interfaces.IWidget"
layer="z3c.form.interfaces.IFormLayer"
view="my.package.interfaces.ISomeView"
template="path/to/template.pt"
/>
and, of course, "widget" may be the default widget or one you've
specified in the page form via:
form.fields['myField'].widgetFactory = ...
but to override the template for only one occurrence of a widget in a
form, after the widget initialization (ie, in your update() method,
after doing "super().update()", use:
from zope.interface import alsoProvides
from my.package.interfaces import ISomeWidget
alsoProvides(form.widgets['myField'], ISomeWidget)
and in the ZCML
<z3c:widgetTemplate
mode="display"
widget="my.package.interfaces.ISomeWidget"
layer="z3c.form.interfaces.IFormLayer"
view="my.package.interfaces.ISomeView"
template="path/to/template.pt"
/>
Thanks, Carsten
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