from __future__ import unicode_literals

from .utils import get_backend


class ImageCroppingMixin(object):
    def formfield_for_dbfield(self, db_field, **kwargs):
        crop_fields = getattr(self.model, 'crop_fields', {})
        if db_field.name in crop_fields:
            target = crop_fields[db_field.name]
            kwargs['widget'] = get_backend().get_widget(db_field, target, self.admin_site)

        return super(ImageCroppingMixin, self).formfield_for_dbfield(db_field, **kwargs)