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