67 lines
2.1 KiB
Python
67 lines
2.1 KiB
Python
from typing import Any, Dict, Generator, Optional, Type
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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: Optional[str] = None
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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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projector_elements: 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 AppProjectorElement in elements:
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element = AppProjectorElement()
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projector_elements[element.name] = element # type: ignore
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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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