import logging from typing import ( Any, Callable, Dict, Iterable, List, Mapping, MutableSequence, Optional, Sequence, Tuple, Union ) from PyQt5.QtCore import ( QAbstractListModel, QModelIndex, QObject, Qt, pyqtProperty, pyqtSignal, pyqtSlot ) from .list_item import ListItem Index = Union[int, str] NewItem = Union[ListItem, Mapping[str, Any], Sequence] class _GetFail: pass class _PopFail: pass class ListModel(QAbstractListModel): rolesSet = pyqtSignal() changed = pyqtSignal() countChanged = pyqtSignal(int) def __init__(self, initial_data: Optional[List[NewItem]] = None, container: Callable[..., MutableSequence] = list, parent: QObject = None) -> None: super().__init__(parent) self._data: MutableSequence[ListItem] = container() if initial_data: self.extend(initial_data) def __repr__(self) -> str: return "%s(%r)" % (type(self).__name__, self._data) def __contains__(self, index: Index) -> bool: if isinstance(index, str): try: self.indexWhere(self.mainKey, index) return True except ValueError: return False return index in self._data def __getitem__(self, index: Index) -> ListItem: return self.get(index) def __setitem__(self, index: Index, value: NewItem) -> None: self.set(index, value) def __delitem__(self, index: Index) -> None: self.remove(index) def __len__(self) -> int: return len(self._data) def __iter__(self) -> Iterable[NewItem]: return iter(self._data) @pyqtSlot(result=str) def repr(self) -> str: return self.__repr__() @pyqtProperty("QStringList", notify=rolesSet) def roles(self) -> Tuple[str, ...]: return self._data[0].roles if self._data else () # type: ignore @pyqtProperty("QVariant", notify=rolesSet) def mainKey(self) -> Optional[str]: return self._data[0].mainKey if self._data else None def roleNumbers(self) -> Dict[str, int]: return {name: Qt.UserRole + i for i, name in enumerate(self.roles, 1)} \ if self._data else {} def roleNames(self) -> Dict[int, bytes]: return {Qt.UserRole + i: bytes(name, "utf-8") for i, name in enumerate(self.roles, 1)} \ if self._data else {} def data(self, index: QModelIndex, role: int = Qt.DisplayRole) -> Any: if role <= Qt.UserRole: return None return getattr(self._data[index.row()], str(self.roleNames()[role], "utf8")) def rowCount(self, _: QModelIndex = QModelIndex()) -> int: return len(self) def _convert_new_value(self, value: NewItem) -> ListItem: def convert() -> ListItem: if self._data and isinstance(value, Mapping): if not set(value.keys()) <= set(self.roles): raise ValueError( f"{value}: must have all these keys: {self.roles}" ) return type(self._data[0])(**value) if not self._data and isinstance(value, Mapping): raise NotImplementedError("First item must be set from Python") if self._data and isinstance(value, type(self._data[0])): return value if not self._data and isinstance(value, ListItem): return value raise TypeError("%r: must be mapping or %s" % ( value, type(self._data[0]).__name__ if self._data else "ListItem" )) value = convert() value.setParent(self) return value @pyqtProperty(int, notify=countChanged) def count(self) -> int: return len(self) @pyqtSlot(str, "QVariant", result=int) def indexWhere(self, prop: str, is_value: Any) -> int: for i, item in enumerate(self._data): if getattr(item, prop) == is_value: return i raise ValueError(f"No item in model data with " f"property {prop!r} set to {is_value!r}.") @pyqtSlot(int, result="QVariant") @pyqtSlot(str, result="QVariant") @pyqtSlot(int, "QVariant", result="QVariant") @pyqtSlot(str, "QVariant", result="QVariant") def get(self, index: Index, default: Any = _GetFail()) -> ListItem: try: i_index: int = self.indexWhere(self.mainKey, index) \ if isinstance(index, str) else index return self._data[i_index] except (ValueError, IndexError): if isinstance(default, _GetFail): raise return default @pyqtSlot(int, "QVariantMap") def insert(self, index: int, value: NewItem) -> None: value = self._convert_new_value(value) self.beginInsertRows(QModelIndex(), index, index) had_data = bool(self._data) self._data.insert(index, value) if not had_data: self.rolesSet.emit() self.endInsertRows() self.countChanged.emit(len(self)) self.changed.emit() @pyqtSlot("QVariantMap") def append(self, value: NewItem) -> None: self.insert(len(self), value) @pyqtSlot(list) def extend(self, values: Iterable[NewItem]) -> None: for val in values: self.append(val) @pyqtSlot(int, "QVariantMap", result=int) @pyqtSlot(int, "QVariantMap", "QStringList", result=int) @pyqtSlot(str, "QVariantMap", result=int) @pyqtSlot(str, "QVariantMap", "QStringList", result=int) def update(self, index: Index, value: NewItem, ignore_roles: Sequence[str] = ()) -> int: value = self._convert_new_value(value) i_index: int = self.indexWhere(self.mainKey, index) \ if isinstance(index, str) else index to_update = self[i_index] for role in self.roles: if role not in ignore_roles: try: setattr(to_update, role, getattr(value, role)) except AttributeError: # constant/not settable pass qidx = QAbstractListModel.index(self, i_index, 0) updated = [number for name, number in self.roleNumbers().items() if name not in ignore_roles] self.dataChanged.emit(qidx, qidx, updated) self.changed.emit() return i_index @pyqtSlot(str, "QVariantMap") @pyqtSlot(str, "QVariantMap", int) @pyqtSlot(str, "QVariantMap", int, int) @pyqtSlot(str, "QVariantMap", int, int, "QStringList") def upsert(self, where_main_key_is: Any, update_with: NewItem, new_index_if_insert: Optional[int] = None, new_index_if_update: Optional[int] = None, ignore_roles: Sequence[str] = ()) -> None: try: index = self.update(where_main_key_is, update_with, ignore_roles) except (IndexError, ValueError): self.insert(new_index_if_insert or len(self), update_with) else: if new_index_if_update: self.move(index, new_index_if_update) @pyqtSlot(int, list) @pyqtSlot(str, list) def set(self, index: Index, value: NewItem) -> None: i_index: int = self.indexWhere(self.mainKey, index) \ if isinstance(index, str) else index qidx = QAbstractListModel.index(self, i_index, 0) value = self._convert_new_value(value) self._data[i_index] = value self.dataChanged.emit(qidx, qidx, self.roleNames()) self.changed.emit() @pyqtSlot(int, str, "QVariant") @pyqtSlot(str, str, "QVariant") def setProperty(self, index: Index, prop: str, value: Any) -> None: i_index: int = self.indexWhere(self.mainKey, index) \ if isinstance(index, str) else index setattr(self[i_index], prop, value) qidx = QAbstractListModel.index(self, i_index, 0) self.dataChanged.emit(qidx, qidx, (self.roleNumbers()[prop],)) self.changed.emit() @pyqtSlot(int, int) @pyqtSlot(int, int, int) @pyqtSlot(str, int) @pyqtSlot(str, int, int) def move(self, from_: Index, to: int, n: int = 1) -> None: # pylint: disable=invalid-name i_from: int = self.indexWhere(self.mainKey, from_) \ if isinstance(from_, str) else from_ qlast = i_from + n - 1 if (n <= 0) or (i_from == to) or (qlast == to) or \ not (len(self) > qlast >= 0) or \ not len(self) >= to >= 0: return qidx = QModelIndex() qto = min(len(self), to + n if to > i_from else to) # print(f"self.beginMoveRows(qidx, {i_from}, {qlast}, qidx, {qto})") valid = self.beginMoveRows(qidx, i_from, qlast, qidx, qto) if not valid: logging.warning("Invalid move operation - %r", locals()) return last = i_from + n cut = self._data[i_from:last] del self._data[i_from:last] self._data[to:to] = cut self.endMoveRows() self.changed.emit() @pyqtSlot(int) @pyqtSlot(str) def remove(self, index: Index) -> None: i_index: int = self.indexWhere(self.mainKey, index) \ if isinstance(index, str) else index self.beginRemoveRows(QModelIndex(), i_index, i_index) del self._data[i_index] self.endRemoveRows() self.countChanged.emit(len(self)) self.changed.emit() @pyqtSlot(int, result="QVariant") @pyqtSlot(str, result="QVariant") def pop(self, index: Index, default: Any = _PopFail()) -> ListItem: try: i_index: int = self.indexWhere(self.mainKey, index) \ if isinstance(index, str) else index item = self[i_index] except (ValueError, IndexError): if isinstance(default, _PopFail): raise return default self.beginRemoveRows(QModelIndex(), i_index, i_index) del self._data[i_index] self.endRemoveRows() self.countChanged.emit(len(self)) self.changed.emit() return item @pyqtSlot() def clear(self) -> None: # Reimplemented for performance reasons (begin/endRemoveRows) self.beginRemoveRows(QModelIndex(), 0, len(self)) self._data.clear() self.endRemoveRows() self.countChanged.emit(len(self)) self.changed.emit()