def widget(self, _context, field, **kw):
attrs = kw
class_ = attrs.pop("class_", None)
# Try to do better than accepting the string value by looking through
# the interfaces and trying to find the field, so that we can use
# 'fromUnicode()'
if isinstance(class_, type):
ifaces = implementedBy(class_)
for name, value in kw.items():
for iface in ifaces:
if name in iface:
attrs[name] = iface[name].fromUnicode(value)
break
if class_ is None:
# The _default_widget_factory is required to allow the
# <widget> directive to be given without a "class"
# attribute. This can be used to override some of the
# presentational attributes of the widget implementation.
class_ = self._default_widget_factory
# don't wrap a factory into a factory
if IViewFactory.providedBy(class_):
factory = class_
else:
factory = CustomWidgetFactory(class_, **attrs)
self._widgets[field+'_widget'] = factory
def setUpWidget(view, name, field, viewType, value=no_value, prefix=None,
ignoreStickyValues=False, context=None):
"""Sets up a single view widget.
The widget will be an attribute of the `view`. If there is already
an attribute of the given name, it must be a widget and it will be
initialized with the given `value` if not ``no_value``.
If there isn't already a `view` attribute of the given name, then a
widget will be created and assigned to the attribute.
"""
if context is None:
context = view.context
widgetName = name + '_widget'
# check if widget already exists
widget = getattr(view, widgetName, None)
if widget is None:
# does not exist - create it
widget = _createWidget(context, field, viewType, view.request)
setattr(view, widgetName, widget)
elif IViewFactory.providedBy(widget):
# exists, but is actually a factory - use it to create the widget
widget = widget(field.bind(context), view.request)
setattr(view, widgetName, widget)
# widget must implement IWidget
if not IWidget.providedBy(widget):
raise TypeError(
"Unable to configure a widget for %s - attribute %s does not "
"implement IWidget" % (name, widgetName))
if prefix:
widget.setPrefix(prefix)
if value is not no_value and (
ignoreStickyValues or not _widgetHasStickyValue(widget)):
widget.setRenderedValue(value)
