Tim Cook schrieb:
> If I have an interface (IDvText) and a class DvText (shown below). and
> I want it to act exactly as a zope.schema Textline (with some additional
> attributes) then is this correct and how do I (where do I find how to)
> register/add to the TextLine widget? Apologies for the line wraps.
> class IDvText(Interface):
> blah blah!
> value = TextLine(
> title = _(u"Value"),
> description = _(u"""Displayable rendition of the item,
> regardless of its underlying structure. For DV_CODED_TEXT, this is the
> rubric of the complete term as provided by the terminology service. No
> carriage returns, line feeds, or other non-printing characters
> encoding = Object(
> schema = ICodePhrase,
> title = _(u"Encoding"),
> description = _(u"""Name of character encoding scheme in which
> this value is encoded. Coded from openEHR Code Set "character sets".
> Unicode is the default assumption in openEHR, with UTF-8 being the
> assumed encoding. This attribute allows for variations from these
> required = False
> from zope.interface import implements
> from zope.i18nmessageid.message import MessageFactory
> from zope.schema import TextLine
> from interfaces.dvtext import IDvText
> _ = MessageFactory('oship')
> class DvText(TextLine):
> blah blah!
> def __init__(self, value, mappings=None, formatting=None,
> hyperlink=None, language=None, encoding=None):
> self.value = value
> self.mappings = mappings
> self.formatting = formatting
> self.hyperlink = hyperlink
> self.language = language
> self.encoding = encoding
This does not look like you want to write a field. A schema field itself
is not persistent on an object. The field is constructed at runtime and
has a 'get' and a 'set' method to handle the value that should to be
persistent on an object.
As you have a bunch of informations you store in a DvText it looks like
it should itself be persistent, and not a field! It seems you just want
to show specific informations about it somewhere. Can you describe what
you want to do?
If you want to write a schema filed, it has to comply with (beside
others) the zope.schema.interfaces.IField interface that needs some
attributes like title, description and required that are used in a
schema description. Then you should read the implementation of
zope.schema._bootstrapfields.Field, .Text and .TextLine.
The registration of widgets happens in
zope/app/form/browser/configure.zcml. Also your field should be a field,
and it is working, the right TextLine widget should be picked up cause
DvText say's it implements ITextLine (cause it inherits from TextLine),
and the widget is registered for ITextLine.
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