107 lines
3.7 KiB
Python
107 lines
3.7 KiB
Python
from typing import Any, Dict, Generator, Iterable, List, Type
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from .collection import CollectionElement
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class ProjectorElement:
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"""
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Base class for an element on the projector.
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Every app which wants to add projector elements has to create classes
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subclassing from this base class with different names. The name attribute
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has to be set.
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"""
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name = None # type: str
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def check_and_update_data(self, projector_object: Any, config_entry: Any) -> Any:
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"""
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Checks projector element data via self.check_data() and updates
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them via self.update_data(). The projector object and the config
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entry have to be given.
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"""
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self.projector_object = projector_object
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self.config_entry = config_entry
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assert self.config_entry.get('name') == self.name, (
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'To get data of a projector element, the correct config entry has to be given.')
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self.check_data()
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return self.update_data() or {}
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def check_data(self) -> None:
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"""
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Method can be overridden to validate projector element data. This
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may raise ProjectorException in case of an error.
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Default: Does nothing.
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"""
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pass
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def update_data(self) -> Dict[Any, Any]:
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"""
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Method can be overridden to update the projector element data
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output. This should return a dictonary. Use this for server
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calculated data which have to be forwared to the client.
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Default: Does nothing.
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"""
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pass
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def get_requirements(self, config_entry: Any) -> Iterable[Any]:
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"""
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Returns an iterable of instances that are required for this projector
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element. The config_entry has to be given.
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"""
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return ()
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def get_requirements_as_collection_elements(self, config_entry: Any) -> Iterable[CollectionElement]:
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"""
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Returns an iterable of collection elements that are required for this
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projector element. The config_entry has to be given.
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"""
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return (CollectionElement.from_instance(instance) for instance in self.get_requirements(config_entry))
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def get_collection_elements_required_for_this(
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self, collection_element: CollectionElement,
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config_entry: Any) -> List[CollectionElement]:
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"""
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Returns a list of CollectionElements that have to be sent to every
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projector that shows this projector element according to the given
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collection_element.
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Default: Returns only the collection_element if it belongs to the
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requirements but return all requirements if the projector changes.
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"""
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requirements_as_collection_elements = list(self.get_requirements_as_collection_elements(config_entry))
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for requirement in requirements_as_collection_elements:
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if collection_element == requirement:
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output = [collection_element]
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break
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else:
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if collection_element.information.get('this_projector'):
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output = [collection_element]
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output.extend(requirements_as_collection_elements)
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else:
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output = []
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return output
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projector_elements = {} # type: Dict[str, ProjectorElement]
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def register_projector_elements(elements: Generator[Type[ProjectorElement], None, None]) -> None:
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"""
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Registers projector elements for later use.
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Has to be called in the app.ready method.
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"""
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for Element in elements:
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element = Element()
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projector_elements[element.name] = element
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def get_all_projector_elements() -> Dict[str, ProjectorElement]:
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"""
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Returns all projector elements that where registered with
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register_projector_elements()
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"""
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return projector_elements
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