from ..core.config import config from ..core.exceptions import ProjectorException from ..core.models import Projector from ..utils.collection import CollectionElement from ..utils.projector import ProjectorElement from .models import Item class ItemListSlide(ProjectorElement): """ Slide definitions for Item model. This is only for item list slides. Set 'id' to None to get a list slide of all root items. Set 'id' to an integer to get a list slide of the children of the metioned item. Additionally set 'tree' to True to get also children of children. """ name = 'agenda/item-list' def check_data(self): pk = self.config_entry.get('id') if pk is not None: # Children slide. if not Item.objects.filter(pk=pk).exists(): raise ProjectorException('Item does not exist.') def get_requirements(self, config_entry): yield from Item.objects.all() class ListOfSpeakersSlide(ProjectorElement): """ Slide definitions for Item model. This is only for list of speakers slide. You have to set 'id'. """ name = 'agenda/list-of-speakers' def check_data(self): if not Item.objects.filter(pk=self.config_entry.get('id')).exists(): raise ProjectorException('Item does not exist.') def get_requirements(self, config_entry): pk = config_entry.get('id') if pk is not None: # List of speakers slide. try: item = Item.objects.get(pk=pk) except Item.DoesNotExist: # Item does not exist. Just do nothing. pass else: yield item for speaker in item.speakers.filter(end_time=None): # Yield current speaker and next speakers yield speaker.user query = (item.speakers.exclude(end_time=None) .order_by('-end_time')[:config['agenda_show_last_speakers']]) for speaker in query: # Yield last speakers yield speaker.user def get_collection_elements_required_for_this(self, collection_element, config_entry): output = super().get_collection_elements_required_for_this(collection_element, config_entry) # Full update if item changes because then we may have new # candidates and therefor need new users. if collection_element.collection_string == Item.get_collection_string() and collection_element.id == config_entry.get('id'): output.extend(self.get_requirements_as_collection_elements(config_entry)) return output def update_data(self): return {'agenda_item_id': self.config_entry.get('id')} class CurrentListOfSpeakersSlide(ProjectorElement): """ Slide for the current list of speakers. """ name = 'agenda/current-list-of-speakers' def get_requirements(self, config_entry): # The query mechanism on client needs the referenced projector. reference_projector = Projector.objects.get( pk=config['projector_currentListOfSpeakers_reference']) yield reference_projector items = self.get_agenda_items(reference_projector) for item in items: yield item for speaker in item.speakers.filter(end_time=None): yield speaker.user query = (item.speakers.exclude(end_time=None) .order_by('-end_time')[:config['agenda_show_last_speakers']]) for speaker in query: # Yield last speakers yield speaker.user def get_agenda_items(self, projector): for element in projector.elements.values(): agenda_item_id = element.get('agenda_item_id') if agenda_item_id is not None: yield Item.objects.get(pk=agenda_item_id) def get_collection_elements_required_for_this(self, collection_element, config_entry): output = super().get_collection_elements_required_for_this(collection_element, config_entry) # Full update if agenda_item or referenced projector changes because # then we may have new candidates and therefor need new users. reference_projector = Projector.objects.get( pk=config['projector_currentListOfSpeakers_reference']) is_reference_projector = collection_element == CollectionElement.from_values( reference_projector.get_collection_string(), reference_projector.pk) is_config = ( collection_element.collection_string == 'core/config' and collection_element.information.get('changed_config') == 'projector_currentListOfSpeakers_reference') if is_reference_projector or is_config: output.extend(self.get_requirements_as_collection_elements(config_entry)) else: items = self.get_agenda_items(reference_projector) for item in items: if collection_element == CollectionElement.from_values(item.get_collection_string(), item.pk): output.extend(self.get_requirements_as_collection_elements(config_entry)) break return output