On Aug 3, 2005, at 4:46 PM, Marc Rijken wrote:
Hi all,
Hi Marc.
I want to propose two little changes to SourceInputWidget
(zope.app.form.browser.source).
1. Context in Source
At this moment, it is not possible to use the context in the source,
because they do not get the context from the SourceInputWidget. For a
typical source, I need the context, so I can lookup terms that are
valid only in a specific context. I propose the following change,
because the context is in the field which is passed to the
constructor:
def __init__(self, field, source, request):
super(SourceInputWidget, self).__init__(field, request)
self.source = source
# changed in order to let the source know the fieldcontext
self.source.field = field
# end of changes
<snip>
I strongly agree that sources need a connection to the field's
context. Vocabularies, the precursor to sources, do this. Because
Sources are supposed to be the "cleaned up" vocabularies, eventually
deprecating them, we need to spend some thought to get this right and
get concensus. Jim Fulton has expressed strong opinions about this
in the past, so we probably need to wait on his return from vacation
(a few weeks from now) before working through this.
If you need to proceed now with this sort of use case, I suggest
using vocabularies.
2. use _toFieldValue en _toFormValue in SourceInputWidget.
_toFieldValue and _toFormValue are powerfull functions in widgets
to use a) a
standard widget and b) override the widget on specific parts. I need a
SourceInputWidget which uses an instance of a class as value. Because
the SourceInputWidget only works with strings, I had to convert the
string to/from the class instance.
Sources already can be used with arbitrary objects; the sources need
to be able to be converted to string tokens for display. Read
through the .txt again; I'll be happy to try and answer specific
questions.
Gary
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