widget.py

import zope.interface
import zope.schema.interfaces

import z3c.form.interfaces
import z3c.form.browser.textarea
import z3c.form.widget
from plone.app.z3cform.widget import RelatedItemsWidget


class MyRelatedItemsWidget(RelatedItemsWidget):

    def _base_args(self):
        args = super(MyRelatedItemsWidget, self)._base_args()
        args['pattern_options']['selectableTypes'] = ['SomeType']
        args['pattern_options']['baseCriteria'] = [{
            'i': 'portal_type',
            'o': 'plone.app.querystring.operation.list.contains',
            'v': ['SomeType', 'Folder']
          }]
        return args


@zope.component.adapter(zope.schema.interfaces.IField,
                        IMyLayer)
@zope.interface.implementer(z3c.form.interfaces.IFieldWidget)
def MyRelatedItemFieldWidget(field, request):
    widget = z3c.form.widget.FieldWidget(field,
                                         MyRelatedItemsWidget(request))
    widget.vocabulary = 'plone.app.vocabularies.Catalog'
    return widget