class IFieldEvent(Interface):
field = Object(
IField,
description="The field that has been changed")
object = Attribute("The object containing the field")
class IMapping(IMinMaxLen, IIterable, IContainer):
"""
Field containing an instance of :class:`collections.Mapping`.
The *key_type* and *value_type* fields allow specification
of restrictions for keys and values contained in the dict.
"""
key_type = Object(
IField,
description=_("Field keys must conform to the given type, expressed "
"via a Field."))
value_type = Object(
IField,
description=_("Field values must conform to the given type, expressed "
"via a Field."))
class ICollection(IMinMaxLen, IIterable, IContainer):
"""Abstract interface containing a collection value.
The Value must be iterable and may have a min_length/max_length.
"""
value_type = Object(
IField,
title=_("Value Type"),
description=_("Field value items must conform to the given type, "
"expressed via a Field."))
unique = Bool(title=_('Unique Members'),
description=_(
'Specifies whether the members of the collection '
'must be unique.'),
default=False)
class IObject(IField):
"""
Field containing an Object value.
.. versionchanged:: 4.6.0
Add the *validate_invariants* attribute.
"""
schema = Object(
IInterface,
description=_("The Interface that defines the Fields comprising the Object.")
)
validate_invariants = Bool(
title=_("Validate Invariants"),
description=_("A boolean that says whether ``schema.validateInvariants`` "
"is called from ``self.validate()``. The default is true."),
default=True,
)