implement generic table model

implement generic table model which reads table info from db and
constructs table view

gui/table_model.py

@@ -0,0 +1,84 @@
+from datetime import datetime
+
+from PySide6.QtCore import QAbstractTableModel, QModelIndex
+from PySide6.QtGui import Qt
+
+from model_config import KontorModelConfig
+
+
+class KontorTableModel(QAbstractTableModel):
+
+    def __init__(self, model_config: KontorModelConfig):
+        super().__init__()
+        self._main_window = model_config.main_window
+        self._config = model_config
+        self._data = None
+
+    def refresh(self):
+        data = []
+        cursor = self._config.db_conn.cursor()
+        cursor.execute(self._config.get_statement())
+        rows = cursor.fetchall()
+        print(len(rows))
+        if len(rows) > 0:
+            self.beginResetModel()
+            for row in rows:
+                data.append(list(row))
+            self._data = data
+            self.endResetModel()
+        else:
+            self._data = None
+        self.layoutChanged.emit()
+        self._main_window.statusBar.showMessage(f"{len(rows)} Einträge geladen", 3000)
+
+    def rowCount(self, parent=QModelIndex()):
+        # The length of the outer list.
+        if self._data is None:
+            return 0
+        return len(self._data)
+
+    def headerData(self, col, orientation, role=Qt.ItemDataRole.DisplayRole):
+        if orientation == Qt.Orientation.Horizontal and role == Qt.ItemDataRole.DisplayRole:
+            return self._config.header[col]
+        if orientation == Qt.Orientation.Vertical and role == Qt.ItemDataRole.DisplayRole:
+            return str(col+1)
+
+    def data(self, index, role=Qt.ItemDataRole.DisplayRole):
+        if self._data is None:
+            return None
+        value = self._data[index.row()][index.column()]
+        if role == Qt.ItemDataRole.DisplayRole:
+            if isinstance(value, datetime):
+                return value.strftime("%Y-%m-%d %M:%M:%S")
+            if isinstance(value, str):
+                return value
+            if isinstance(value, bytes):
+                if value == b'\x01':
+                    return self._main_window.tick
+                else:
+                    return self._main_window.cross
+            return value
+        if role == Qt.ItemDataRole.DecorationRole:
+            if isinstance(value, bytes):
+                # print('{}: {}'.format(value, type(value)))
+                if value == b'\x01':
+                    return self._main_window.tick
+                else:
+                    return self._main_window.cross
+
+    def columnCount(self, index=QModelIndex()):
+        # The following takes the first sub-list, and returns
+        # the length (only works if all rows are an equal length)
+        print(f"Header count: {len(self._config.get_header())}")
+        return len(self._config.get_header())
+
+    def setData(self, index, value, role=Qt.ItemDataRole.EditRole):
+        if role == Qt.ItemDataRole.EditRole:
+            self._data[index.row()][index.column()] = value
+        if role == Qt.ItemDataRole.CheckStateRole:
+            checked = value == Qt.CheckState.Checked
+            self._data[index.row()][index.column()] = checked
+        return True
+
+    def flags(self, index):
+        return Qt.ItemFlag.ItemIsSelectable | Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsEditable | Qt.ItemFlag.ItemIsUserTristate