from django.core.exceptions import ImproperlyConfigured from django.core.urlresolvers import reverse from openslides.utils.utils import int_or_none class RelatedModelMixin(object): """ Mixin for motion related models, that appear on the motion slide. """ def save(self, *args, **kwargs): """ Saves the model and updates the projector, if the motion in on it. """ from .api import update_projector value = super(RelatedModelMixin, self).save(*args, **kwargs) if self.get_related_model().is_active_slide(): update_projector() return value def delete(self, *args, **kwargs): """ Deletes the model and updates the projector, if the motion in on it. """ from .api import update_projector value = super(RelatedModelMixin, self).delete(*args, **kwargs) if self.get_related_model().is_active_slide(): update_projector() return value def get_related_model(self): """ Return the pk of the related model. """ raise ImproperlyConfigured( '%s has to have a method "get_related_model_pk"' % type(self)) class SlideMixin(object): """ A Mixin for a Django-Model, for making the model a slide. """ slide_callback_name = None """ Name of the callback to render the model as slide. """ def save(self, *args, **kwargs): """ Updates the projector, if the object is on the projector and changed. """ from openslides.projector.api import update_projector value = super(SlideMixin, self).save(*args, **kwargs) if self.is_active_slide(): update_projector() return value def delete(self, *args, **kwargs): """ Updates the projector if the object is on the projector and is deleted. """ from openslides.projector.api import update_projector # Checking active slide has to be done before calling super().delete() # because super().delete() deletes the object and than we have no # access to the former existing primary key any more. But updating # projector has to be done after deleting the object of course. update_required = self.is_active_slide() value = super(SlideMixin, self).delete(*args, **kwargs) if update_required: update_projector() return value def get_absolute_url(self, link='projector'): """ Return the url to activate the slide, if link == 'projector'. """ if link in ('projector', 'projector_preview'): url_name = {'projector': 'projector_activate_slide', 'projector_preview': 'projector_preview'}[link] value = '%s?pk=%d' % ( reverse(url_name, args=[self.slide_callback_name]), self.pk) else: value = super(SlideMixin, self).get_absolute_url(link) return value def is_active_slide(self): """ Return True, if the the slide is the active slide. """ from openslides.projector.api import get_active_slide active_slide = get_active_slide() slide_pk = int_or_none(active_slide.get('pk', None)) return (active_slide['callback'] == self.slide_callback_name and self.pk == slide_pk) def get_slide_context(self, **context): """ Returns the context for the template which renders the slide. """ slide_name = self._meta.object_name.lower() context.update({'slide': self, slide_name: self}) return context