Reorganize backend files, show accounts in UI

harmonyqml/backend/model/list_model.py

@@ -0,0 +1,205 @@
+import logging
+from collections.abc import MutableSequence
+from typing import Any, Dict, List, Mapping, Optional, Sequence, Tuple, Union
+
+from namedlist import namedlist
+from PyQt5.QtCore import (
+    QAbstractListModel, QModelIndex, Qt, pyqtProperty, pyqtSlot
+)
+
+NewValue = Union[Mapping[str, Any], Sequence]
+
+
+class _QtListModel(QAbstractListModel):
+    def __init__(self) -> None:
+        super().__init__()
+        self._ref_namedlist          = None
+        self._roles: Tuple[str, ...] = ()
+        self._list:  list            = []
+
+    def roleNames(self) -> Dict[int, bytes]:
+        return {Qt.UserRole + i: bytes(f, "utf-8")
+                for i, f in enumerate(self._roles, 1)}
+
+
+    def data(self, index: QModelIndex, role: int = Qt.DisplayRole) -> Any:
+        if role <= Qt.UserRole:
+            return None
+
+        return self._list[index.row()][role - Qt.UserRole - 1]
+
+
+    def rowCount(self, _: QModelIndex = QModelIndex()) -> int:
+        return len(self._list)
+
+
+    def _convert_new_value(self, value: NewValue) -> Any:
+        if isinstance(value, Mapping):
+            if not self._ref_namedlist:
+                self._ref_namedlist = namedlist("ListItem", value.keys())
+                self._roles         = tuple(value.keys())
+
+            return self._ref_namedlist(**value)  # type: ignore
+
+        if isinstance(value, Sequence):
+            if not self._ref_namedlist:
+                try:
+                    self._ref_namedlist = namedlist(
+                        value.__class__.__name__, value._fields  # type: ignore
+                    )
+                    self._roles = tuple(value._fields)  # type: ignore
+                except AttributeError:
+                    raise TypeError(
+                        "Need a mapping/dict, namedtuple or namedlist as "
+                        "first value to set allowed keys/fields."
+                    )
+
+            return self._ref_namedlist(*value)  # type: ignore
+
+
+        raise TypeError("Value must be a mapping or sequence.")
+
+
+    @pyqtSlot(int, result="QVariantMap")
+    def get(self, index: int) -> Dict[str, Any]:
+        return self._list[index]._asdict()
+
+
+    @pyqtSlot(str, "QVariant", result=int)
+    def indexWhere(self, prop: str, is_value: Any) -> int:
+        for i, item in enumerate(self._list):
+            if getattr(item, prop) == is_value:
+                return i
+
+        raise ValueError(f"No {type(self._ref_namedlist)} in list with "
+                         f"property {prop!r} set to {is_value!r}.")
+
+
+    @pyqtSlot(int, list)
+    def insert(self, index: int, value: NewValue) -> None:
+        value = self._convert_new_value(value)
+        self.beginInsertRows(QModelIndex(), index, index)
+        self._list.insert(index, value)
+        self.endInsertRows()
+
+
+    @pyqtProperty(int)
+    def count(self) -> int:
+        return self.rowCount()
+
+
+    @pyqtSlot(list)
+    def append(self, value: NewValue) -> None:
+        self.insert(self.rowCount(), value)
+
+
+    @pyqtSlot(int, list)
+    def set(self, index: int, value: NewValue) -> None:
+        qidx              = self.index(index, 0)
+        value             = self._convert_new_value(value)
+        self._list[index] = value
+        self.dataChanged.emit(qidx, qidx, self.roleNames())
+
+
+    @pyqtSlot(int, str, "QVariant")
+    def setProperty(self, index: int, prop: str, value: Any) -> None:
+        self._list[index][self._roles.index(prop)] = value
+        qidx = self.index(index, 0)
+        self.dataChanged.emit(qidx, qidx, self.roleNames())
+
+
+    # pylint: disable=invalid-name
+    @pyqtSlot(int, int)
+    @pyqtSlot(int, int, int)
+    def move(self, from_: int, to: int, n: int = 1) -> None:
+        qlast = from_ + n - 1
+
+        if (n <= 0) or (from_ == to) or (qlast == to) or \
+           not (self.rowCount() > qlast >= 0) or \
+           not self.rowCount() >= to >= 0:
+            logging.warning("No need for move or out of range")
+            return
+
+        qidx  = QModelIndex()
+        qto   = min(self.rowCount(), to + n if to > from_ else to)
+        # print(f"self.beginMoveRows(qidx, {from_}, {qlast}, qidx, {qto})")
+        valid = self.beginMoveRows(qidx, from_, qlast, qidx, qto)
+
+        if not valid:
+            logging.warning("Invalid move operation")
+            return
+
+        last = from_ + n
+        cut  = self._list[from_:last]
+        del self._list[from_:last]
+        self._list[to:to] = cut
+
+        self.endMoveRows()
+
+
+    @pyqtSlot(int)
+    def remove(self, index: int) -> None:
+        self.beginRemoveRows(QModelIndex(), index, index)
+        del self._list[index]
+        self.endRemoveRows()
+
+
+    @pyqtSlot()
+    def clear(self) -> None:
+        # Reimplemented for performance reasons (begin/endRemoveRows)
+        self.beginRemoveRows(QModelIndex(), 0, self.rowCount())
+        self._list.clear()
+        self.endRemoveRows()
+
+
+class ListModel(MutableSequence):
+    def __init__(self, initial_data: Optional[List[NewValue]] = None) -> None:
+        super().__init__()
+        self.qt_model = _QtListModel()
+
+        if initial_data:
+            self.extend(initial_data)
+
+
+    def __repr__(self) -> str:
+        return "%s[%s]" % (type(self).__name__,
+                           ", ".join((repr(i) for i in self)))
+
+    def __getitem__(self, index):
+        # pylint: disable=protected-access
+        return self.qt_model._list[index]
+
+
+    def __setitem__(self, index, value) -> None:
+        self.qt_model.set(index, value)
+
+
+    def __delitem__(self, index) -> None:
+        self.qt_model.remove(index)
+
+
+    def __len__(self) -> int:
+        return self.qt_model.rowCount()
+
+
+    def insert(self, index: int, value: NewValue) -> None:
+        self.qt_model.insert(index, value)
+
+
+    def indexWhere(self, prop: str, is_value: Any) -> int:
+        return self.qt_model.indexWhere(prop, is_value)
+
+
+    def setProperty(self, index: int, prop: str, value: Any) -> None:
+        "Set role of the item at *index* to *value*."
+        self.qt_model.setProperty(index, prop, value)
+
+
+    # pylint: disable=invalid-name
+    def move(self, from_: int, to: int, n: int = 1) -> None:
+        "Move *n* items *from_* index *to* another."
+        self.qt_model.move(from_, to, n)
+
+
+    def clear(self) -> None:
+        self.qt_model.clear()