162 lines
5.7 KiB
Python
162 lines
5.7 KiB
Python
from typing import Any, Dict, List, Mapping, Set, Tuple, Union
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from PyQt5.QtCore import QObject, pyqtProperty, pyqtSignal, pyqtSlot
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PyqtType = Union[str, type]
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class _ListItemMeta(type(QObject)): # type: ignore
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__slots__ = ()
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def __new__(mcs, name: str, bases: Tuple[type], attrs: Dict[str, Any]):
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def to_pyqt_type(type_) -> PyqtType:
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"Return an appropriate pyqtProperty type from an annotation."
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try:
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if issubclass(type_, (bool, int, float, str, type(None))):
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return type_
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if issubclass(type_, Mapping):
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return "QVariantMap"
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return "QVariant"
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except TypeError: # e.g. None passed
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return to_pyqt_type(type(type_))
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# These special attributes must not be processed like properties
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special = {"_main_key", "_required_init_values", "_constant"}
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# These properties won't be settable and will not have a notify signal
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constant: Set[str] = set(attrs.get("_constant") or set())
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# {property_name: (its_pyqt_type, its_default_value)}
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props: Dict[str, Tuple[PyqtType, Any]] = {
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name: (to_pyqt_type(attrs.get("__annotations__", {}).get(name)),
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value)
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for name, value in attrs.items()
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if not (name.startswith("__") or callable(value) or
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name in special)
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}
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# Signals for the pyqtProperty notify arguments
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signals: Dict[str, pyqtSignal] = {
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f"{name}Changed": pyqtSignal(type_)
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for name, (type_, _) in props.items() if name not in constant
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}
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# pyqtProperty() won't take None, so we make dicts of extra kwargs
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# to pass for each property
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pyqt_props_kwargs: Dict[str, Dict[str, Any]] = {
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name: {"constant": True} if name in constant else
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{"notify": signals[f"{name}Changed"],
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"fset": lambda self, value, n=name: (
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setattr(self, f"_{n}", value) or # type: ignore
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getattr(self, f"{n}Changed").emit(value),
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)}
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for name in props
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}
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# The final pyqtProperty objects
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pyqt_props: Dict[str, pyqtProperty] = {
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name: pyqtProperty(
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type_,
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fget=lambda self, n=name: getattr(self, f"_{n}"),
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**pyqt_props_kwargs.get(name, {}),
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)
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for name, (type_, _) in props.items()
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}
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attrs = {
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**attrs, # Original class attributes
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**signals,
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**pyqt_props,
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# Set the internal _properties as slots for memory savings
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"__slots__": tuple({f"_{prop}" for prop in props} & {"_main_key"}),
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"_props": props,
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# The main key is either the attribute _main_key,
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# or the first defined property
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"_main_key": attrs.get("_main_key") or
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list(props.keys())[0] if props else None,
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"_required_init_values": attrs.get("_required_init_values") or (),
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"_constant": constant,
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}
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return type.__new__(mcs, name, bases, attrs)
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class ListItem(QObject, metaclass=_ListItemMeta):
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def __init__(self, *args, **kwargs) -> None:
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super().__init__()
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method: str = "%s.__init__()" % type(self).__name__
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already_set: Set[str] = set()
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required: Set[str] = set(self._required_init_values)
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required_num: int = len(required) + 1 # + 1 = self
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args_num: int = len(self._props) + 1
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from_to: str = str(args_num) if required_num == args_num else \
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f"from {required_num} to {args_num}"
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# Check that not too many positional arguments were passed
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if len(args) > len(self._props):
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raise TypeError(
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f"{method} takes {from_to} positional arguments but "
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f"{len(args) + 1} were given"
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)
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# Set properties from provided positional arguments
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for prop, value in zip(self._props, args):
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setattr(self, f"_{prop}", value)
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already_set.add(prop)
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# Set properties from provided keyword arguments
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for prop, value in kwargs.items():
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if prop in already_set:
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raise TypeError(f"{method} got multiple values for "
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f"argument {prop!r}")
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if prop not in self._props:
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raise TypeError(f"{method} got an unexpected keyword "
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f"argument {prop!r}")
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setattr(self, f"_{prop}", value)
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already_set.add(prop)
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# Check for required init arguments not provided
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missing: Set[str] = required - already_set
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if missing:
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raise TypeError("%s missing %d required argument: %s" % (
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method, len(missing), ", ".join((repr(m) for m in missing))))
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# Set default values for properties not provided in arguments
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for prop in set(self._props) - already_set:
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setattr(self, f"_{prop}", self._props[prop][1])
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def __repr__(self) -> str:
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prop_strings = (
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"\033[%dm%s\033[0m=%r" % (
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1 if p == self.mainKey else 0, # 1 = term bold
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p,
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getattr(self, p)
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) for p in self._props
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)
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return "%s(%s)" % (type(self).__name__, ", ".join(prop_strings))
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@pyqtSlot(result=str)
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def repr(self) -> str:
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return self.__repr__()
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@pyqtProperty("QStringList", constant=True)
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def roles(self) -> List[str]:
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return list(self._props.keys())
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@pyqtProperty(str, constant=True)
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def mainKey(self) -> str:
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return self._main_key
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