auf Wrapper umgestellt, tests ergänzt

doc/Datenbank_ERD.md

@@ -0,0 +1,58 @@
+```mermaid
+erDiagram
+tbl_akteure{
+    Int4 fid PK
+    varchar Bezeichnung
+    varchar(6) vkz "Verfahren, für das der Akteur relevant ist"
+}
+tbl_konten{
+    varchar(3) kontonr
+    varchar bezeichnung
+}
+tbl_ausbauart{
+    int4 id PK
+    varchar Ausbauart_text
+    int4 preis
+    varchar(3) tbe_nr 
+    varchar(3) Ausbauart_nr "Nr. der Ausbauart zur einfacheren Referenz"
+}
+tbl_Massnahme{
+    int4 MnNr
+    int4 Abschnitte FK
+}
+p41_Massnahmen_linie{
+    int4 id PK
+    geom Geometrie
+    varchar mnnr "Berechnet aus mn_konto und lfd_nr"
+    varchar mnname
+    int4 ausbauart FK "ref:tbl_ausbauart.id"
+    varchar(3) mn_konto FK "ref: tbl_konten.kontonr"
+    varchar(2) lfd_nr 
+    varchar(1) tbe
+    bool umsetzung
+    int4 unterhalt_bisher FK "ref: tbl_akteure.id"
+    int4 unterhalt_zukuenftig FK "ref: tbl_akteure.id"
+    int4 bautraeger FK "ref: tbl_akteure.id"
+    int4 kostentraeger FK "ref: tbl_akteure.id"
+    int4 Planungsjahr
+    int4 baujahr
+    int4 Pflege_Anfang
+    int4 Pflege_Ende
+    float8 fahrbahnbreite
+    float8 gesamtbreite
+    varchar vorgesehene_regelungen
+    varchar bemerkungen
+    int4 laenge
+    int4 flaeche
+    varchar foerdersatz
+    bool ingenieurbauwerk
+    varchar bildpfad
+    bool fertiggestellt
+    int4 ausbauart_nr
+    bool plangenehmigt
+}
+
+tbl_konten ||--o{ p41_Massnahmen_linie : verwendet
+tbl_akteure ||--o{ p41_Massnahmen_linie : verwendet
+tbl_ausbauart ||--o{ p41_Massnahmen_linie : verwendet
+```

main.py

@@ -1,6 +1,8 @@
+# sn_plan41/main.py
+
 from qgis.utils import plugins
 from sn_basis.ui.dockmanager import DockManager
-from .ui.dockwidget import DockWidget
+from sn_plan41.ui.dockwidget import DockWidget
 
 
 class Plan41:
@@ -15,14 +17,17 @@ class Plan41:
 
     def initGui(self):
         basis = plugins.get("sn_basis")
-        if basis and basis.ui:
+        if not basis or not getattr(basis, "ui", None):
+            return
+
         self.action = basis.ui.add_action(
             self.plugin_name,
             self.run,
             tooltip=f"Öffnet {self.plugin_name}",
-                priority=20
+            priority=20,
         )
         basis.ui.finalize_menu_and_toolbar()
+        print("Plan41/sn_Basis:initGui called")
 
     def unload(self):
         if self.dockwidget:
@@ -32,13 +37,15 @@ class Plan41:
 
         if self.action:
             basis = plugins.get("sn_basis")
-            if basis and basis.ui:
-                # Action aus Menü und Toolbar entfernen
+            if basis and getattr(basis, "ui", None):
                 basis.ui.remove_action(self.action)
             self.action = None
 
     def run(self):
-        self.dockwidget = DockWidget(self.iface.mainWindow(), subtitle=self.plugin_name)
+        self.dockwidget = DockWidget(
+            self.iface.mainWindow(),
+            subtitle=self.plugin_name,
+        )
         self.dockwidget.setObjectName(self.dock_name)
 
         # Action-Referenz im Dock speichern
@@ -48,5 +55,5 @@ class Plan41:
 
         # Toolbar-Button als aktiv markieren
         basis = plugins.get("sn_basis")
-        if basis and basis.ui:
+        if basis and getattr(basis, "ui", None):
             basis.ui.set_active_plugin(self.action)

pyrightconfig.json

@@ -0,0 +1,3 @@
+{
+  "extraPaths": ["."]
+}

tests/__init__.py

@@ -0,0 +1 @@
+#Testordner

tests/run_tests.py

@@ -0,0 +1,148 @@
+"""
+sn_plan41/test/run_tests.py
+
+Zentraler Test-Runner für sn_plan41.
+Wrapper-konform, QGIS-unabhängig, CI- und IDE-fähig.
+"""
+
+import unittest
+import datetime
+import inspect
+import os
+import sys
+from pathlib import Path
+
+
+# ---------------------------------------------------------
+# Plugin-Roots bestimmen
+# ---------------------------------------------------------
+
+THIS_FILE = Path(__file__).resolve()
+
+# .../plugins/sn_plan41
+SN_PLAN41_ROOT = THIS_FILE.parents[1]
+# .../plugins/sn_basis
+SN_BASIS_ROOT = SN_PLAN41_ROOT.parent / "sn_basis"
+
+# ---------------------------------------------------------
+# sys.path Bootstrap
+# ---------------------------------------------------------
+
+for path in (SN_PLAN41_ROOT, SN_BASIS_ROOT):
+    path_str = str(path)
+    if path_str not in sys.path:
+        sys.path.insert(0, path_str)
+
+
+# ---------------------------------------------------------
+# Farben
+# ---------------------------------------------------------
+
+RED = "\033[91m"
+YELLOW = "\033[93m"
+GREEN = "\033[92m"
+CYAN = "\033[96m"
+MAGENTA = "\033[95m"
+RESET = "\033[0m"
+
+GLOBAL_TEST_COUNTER = 0
+
+
+# ---------------------------------------------------------
+# Farbige TestResult-Klasse
+# ---------------------------------------------------------
+
+class ColoredTestResult(unittest.TextTestResult):
+
+    _last_test_class = None
+
+    def startTest(self, test):
+        global GLOBAL_TEST_COUNTER
+        GLOBAL_TEST_COUNTER += 1
+        self.stream.write(f"{CYAN}[Test {GLOBAL_TEST_COUNTER}]{RESET}\n")
+        super().startTest(test)
+
+    def startTestClass(self, test):
+        cls = test.__class__
+        file = inspect.getfile(cls)
+        filename = os.path.basename(file)
+
+        self.stream.write(
+            f"\n{MAGENTA}{'=' * 70}\n"
+            f"Starte Testklasse: {filename} → {cls.__name__}\n"
+            f"{'=' * 70}{RESET}\n"
+        )
+
+    def addError(self, test, err):
+        super().addError(test, err)
+        self.stream.write(f"{RED}ERROR{RESET}\n")
+
+    def addFailure(self, test, err):
+        super().addFailure(test, err)
+        self.stream.write(f"{RED}FAILURE{RESET}\n")
+
+    def addSkip(self, test, reason):
+        super().addSkip(test, reason)
+        self.stream.write(f"{YELLOW}SKIPPED{RESET}: {reason}\n")
+
+    def addSuccess(self, test):
+        super().addSuccess(test)
+        self.stream.write(f"{GREEN}OK{RESET}\n")
+
+
+# ---------------------------------------------------------
+# Farbiger TestRunner
+# ---------------------------------------------------------
+
+class ColoredTestRunner(unittest.TextTestRunner):
+
+    def _makeResult(self):
+        result = ColoredTestResult(
+            self.stream,
+            self.descriptions,
+            self.verbosity,
+        )
+
+        original_start_test = result.startTest
+
+        def patched_start_test(test):
+            if result._last_test_class != test.__class__:
+                result.startTestClass(test)
+                result._last_test_class = test.__class__
+            original_start_test(test)
+
+        result.startTest = patched_start_test
+        return result
+
+
+# ---------------------------------------------------------
+# Testlauf starten
+# ---------------------------------------------------------
+
+def main():
+    print("\n" + "=" * 70)
+    print(
+        f"{CYAN}Testlauf gestartet am: "
+        f"{datetime.datetime.now():%Y-%m-%d %H:%M:%S}{RESET}"
+    )
+    print("=" * 70 + "\n")
+
+    loader = unittest.TestLoader()
+
+    TEST_ROOT = SN_PLAN41_ROOT / "tests"
+
+    suite = loader.discover(
+    start_dir=str(TEST_ROOT),
+    pattern="test_*.py",
+    top_level_dir=str(SN_PLAN41_ROOT.parent),
+)
+
+
+    runner = ColoredTestRunner(verbosity=2)
+    result = runner.run(suite)
+
+    return 0 if result.wasSuccessful() else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

tests/start_osgeo4w_qgis.bat

@@ -0,0 +1,9 @@
+@echo off
+SET OSGEO4W_ROOT=D:\QGISQT5
+call %OSGEO4W_ROOT%\bin\o4w_env.bat
+set QGIS_PREFIX_PATH=%OSGEO4W_ROOT%\apps\qgis
+set PYTHONPATH=%QGIS_PREFIX_PATH%\python;%PYTHONPATH%
+set PATH=%OSGEO4W_ROOT%\bin;%QGIS_PREFIX_PATH%\bin;%PATH%
+
+REM Neue Eingabeaufforderung starten und Python-Skript ausführen
+start cmd /k "python run_tests.py"

tests/test_tab_a_logic.py

@@ -0,0 +1,153 @@
+import unittest
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+from sn_plan41.ui.tab_a_logic import TabALogic # type: ignore
+from sn_basis.functions.variable_wrapper import get_variable # type: ignore
+from sn_basis.functions.sys_wrapper import file_exists # type: ignore
+
+
+class TestTabALogic(unittest.TestCase):
+
+    # -----------------------------------------------------
+    # 1. Verfahrens-DB setzen und laden
+    # -----------------------------------------------------
+    def test_verfahrens_db_set_and_load(self):
+        logic = TabALogic()
+
+        with TemporaryDirectory() as tmp:
+            db_path = Path(tmp) / "test.gpkg"
+            db_path.write_text("")
+
+            logic.set_verfahrens_db(str(db_path))
+
+            stored = get_variable("verfahrens_db", scope="project")
+            self.assertEqual(stored, str(db_path))
+
+            loaded = logic.load_verfahrens_db()
+            self.assertEqual(loaded, str(db_path))
+
+    # -----------------------------------------------------
+    # 2. Verfahrens-DB löschen
+    # -----------------------------------------------------
+    def test_verfahrens_db_clear(self):
+        logic = TabALogic()
+
+        logic.set_verfahrens_db(None)
+
+        stored = get_variable("verfahrens_db", scope="project")
+        self.assertEqual(stored, "")
+
+    # -----------------------------------------------------
+    # 3. Neue Verfahrens-DB anlegen
+    # -----------------------------------------------------
+    def test_create_new_verfahrens_db(self):
+        logic = TabALogic()
+
+        with TemporaryDirectory() as tmp:
+            db_path = Path(tmp) / "neu.gpkg"
+
+            result = logic.create_new_verfahrens_db(str(db_path))
+
+            self.assertTrue(result)
+            self.assertTrue(file_exists(db_path))
+
+            stored = get_variable("verfahrens_db", scope="project")
+            self.assertEqual(stored, str(db_path))
+
+    def test_create_new_verfahrens_db_with_none_path(self):
+        logic = TabALogic()
+        result = logic.create_new_verfahrens_db(None)
+        self.assertFalse(result)
+
+
+
+    # -----------------------------------------------------
+    # 4. Linkliste setzen und laden
+    # -----------------------------------------------------
+    def test_linkliste_set_and_load(self):
+        logic = TabALogic()
+
+        with TemporaryDirectory() as tmp:
+            link_path = Path(tmp) / "links.xlsx"
+            link_path.write_text("dummy")
+
+            logic.set_linkliste(str(link_path))
+
+            stored = get_variable("linkliste", scope="project")
+            self.assertEqual(stored, str(link_path))
+
+            loaded = logic.load_linkliste()
+            self.assertEqual(loaded, str(link_path))
+
+    # -----------------------------------------------------
+    # 5. Linkliste löschen
+    # -----------------------------------------------------
+    def test_linkliste_clear(self):
+        logic = TabALogic()
+
+        logic.set_linkliste(None)
+
+        stored = get_variable("linkliste", scope="project")
+        self.assertEqual(stored, "")
+
+    # -----------------------------------------------------
+    # 6. Layer-ID speichern
+    # -----------------------------------------------------
+    def test_verfahrensgebiet_layer_id_storage(self):
+        logic = TabALogic()
+
+        class MockLayer:
+            def id(self):
+                return "layer-123"
+
+        logic.save_verfahrensgebiet_layer(MockLayer())
+
+        stored = get_variable("verfahrensgebiet_layer", scope="project")
+        self.assertEqual(stored, "layer-123")
+
+    # -----------------------------------------------------
+    # 7. Ungültiger Layer wird ignoriert
+    # -----------------------------------------------------
+    def test_invalid_layer_is_rejected(self):
+        logic = TabALogic()
+
+        class InvalidLayer:
+            pass
+
+        logic.save_verfahrensgebiet_layer(InvalidLayer())
+
+        stored = get_variable("verfahrensgebiet_layer", scope="project")
+        self.assertEqual(stored, "")
+    #-----------------------------------------------------
+    # 8. Layer-ID wirft Exception
+    #----------------------------------------------------
+    def test_layer_id_raises_exception(self):
+        logic = TabALogic()
+
+        class BadLayer:
+            def id(self):
+                raise RuntimeError("boom")
+
+        logic.save_verfahrensgebiet_layer(BadLayer())
+
+        stored = get_variable("verfahrensgebiet_layer", scope="project")
+        self.assertEqual(stored, "")
+    # -----------------------------------------------------
+    # 11. Layer ID wird leer zurückgegeben
+    # ----------------------------------------------------- 
+    def test_layer_id_returns_empty(self):
+        logic = TabALogic()
+
+        class EmptyLayer:
+            def id(self):
+                return ""
+
+        logic.save_verfahrensgebiet_layer(EmptyLayer())
+
+        stored = get_variable("verfahrensgebiet_layer", scope="project")
+        self.assertEqual(stored, "")
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_tab_a_ui.py

@@ -0,0 +1,57 @@
+"""
+Smoke-Tests für TabA UI (sn_plan41/ui/tab_a_ui.py)
+
+Ziel:
+- UI kann erstellt werden
+- Callbacks crashen nicht
+- Keine Qt-Verhaltensprüfung
+"""
+
+import unittest
+
+from sn_plan41.ui.tab_a_ui import TabA #type:ignore
+
+
+class TestTabAUI(unittest.TestCase):
+
+    # -----------------------------------------------------
+    # 1. UI kann erstellt werden
+    # -----------------------------------------------------
+    def test_tab_a_ui_can_be_created(self):
+        tab = TabA(parent=None,build_ui=False)
+
+        self.assertIsNotNone(tab)
+        self.assertEqual(tab.tab_title, "Daten")
+
+    # -----------------------------------------------------
+    # 2. Toggle-Callbacks crashen nicht
+    # -----------------------------------------------------
+    def test_tab_a_toggle_callbacks_do_not_crash(self):
+        tab = TabA(parent=None,build_ui=False)
+
+        tab._toggle_group(True)
+        tab._toggle_group(False)
+
+        tab._toggle_optional(True)
+        tab._toggle_optional(False)
+
+    # -----------------------------------------------------
+    # 3. Datei-Callbacks akzeptieren leere Eingaben
+    # -----------------------------------------------------
+    def test_tab_a_file_callbacks_accept_empty_input(self):
+        tab = TabA(parent=None,build_ui=False)
+
+        tab._on_verfahrens_db_changed("")
+        tab._on_linkliste_changed("")
+
+    # -----------------------------------------------------
+    # 4. Layer-Callback akzeptiert None
+    # -----------------------------------------------------
+    def test_tab_a_layer_callback_accepts_none(self):
+        tab = TabA(parent=None,build_ui=False)
+
+        tab._on_layer_changed(None)
+
+
+if __name__ == "__main__":
+    unittest.main()

ui/dockwidget.py

@@ -1,7 +1,7 @@
 from sn_basis.ui.tabs.settings_tab import SettingsTab 
-from sn_plan41.ui.tabs.tab_a import TabA
-from sn_plan41.ui.tabs.tab_b import TabB
+from sn_plan41.ui.tab_a_ui import TabA 
+#from sn_plan41.ui.tabs.tab_b import TabB
 from sn_basis.ui.base_dockwidget import BaseDockWidget 
 
 class DockWidget(BaseDockWidget):
-    tabs = [TabA, TabB, SettingsTab]
+    tabs = [TabA, SettingsTab]

ui/tab_a_logic.py

@@ -0,0 +1,132 @@
+"""
+sn_plan41/ui/tab_a_logic.py – Fachlogik für Tab A (Daten)
+"""
+
+from typing import Optional
+
+from sn_basis.functions.variable_wrapper import (#type: ignore
+    get_variable,
+    set_variable,
+)
+from sn_basis.functions.sys_wrapper import (#type:ignore
+    file_exists,
+    write_text,
+)
+from sn_basis.functions.ly_existence_wrapper import layer_exists#type:ignore
+from sn_basis.functions.ly_metadata_wrapper import get_layer_type#type:ignore
+
+
+class TabALogic:
+    """
+    Kapselt die komplette Logik von Tab A:
+    - Verfahrens-Datenbank
+    - optionale Linkliste
+    - Verfahrensgebiet-Layer
+    """
+
+    # -------------------------------
+    # Verfahrens-Datenbank
+    # -------------------------------
+
+    def load_verfahrens_db(self) -> Optional[str]:
+        """
+        Lädt die gespeicherte Verfahrens-Datenbank.
+        """
+        path = get_variable("verfahrens_db", scope="project")
+        if path and file_exists(path):
+            return path
+        return None
+
+    def set_verfahrens_db(self, path: Optional[str]) -> None:
+        """
+        Speichert oder löscht die Verfahrens-Datenbank.
+        """
+        if path:
+            set_variable("verfahrens_db", path, scope="project")
+        else:
+            set_variable("verfahrens_db", "", scope="project")
+
+    def create_new_verfahrens_db(self, path: str) -> bool:
+        """
+        Legt eine neue leere GPKG-Datei an.
+        """
+        if not path:
+            return False
+
+        try:
+            write_text(path, "")
+        except Exception:
+            return False
+
+        self.set_verfahrens_db(path)
+        return True
+
+
+    # -------------------------------
+    # Lokale Linkliste
+    # -------------------------------
+
+    def load_linkliste(self) -> Optional[str]:
+        """
+        Lädt die gespeicherte lokale Linkliste.
+        """
+        path = get_variable("linkliste", scope="project")
+        if path and file_exists(path):
+            return path
+        return None
+
+    def set_linkliste(self, path: Optional[str]) -> None:
+        """
+        Speichert oder löscht die lokale Linkliste.
+        """
+        if path:
+            set_variable("linkliste", path, scope="project")
+        else:
+            set_variable("linkliste", "", scope="project")
+
+    # -------------------------------
+    # Verfahrensgebiet-Layer
+    # -------------------------------
+
+    def save_verfahrensgebiet_layer(self, layer) -> None:
+        """
+        Speichert die ID des Verfahrensgebiet-Layers.
+        Ungültige Layer werden ignoriert.
+        """
+        if layer is None:
+            set_variable("verfahrensgebiet_layer", "", scope="project")
+            return
+
+        if not hasattr(layer, "id") or not callable(layer.id):
+            set_variable("verfahrensgebiet_layer", "", scope="project")
+            return
+
+        try:
+            layer_id = layer.id()
+        except Exception:
+            set_variable("verfahrensgebiet_layer", "", scope="project")
+            return
+
+        if not layer_id:
+            set_variable("verfahrensgebiet_layer", "", scope="project")
+            return
+
+        set_variable("verfahrensgebiet_layer", layer_id, scope="project")
+
+
+    def load_verfahrensgebiet_layer_id(self) -> Optional[str]:
+        """
+        Lädt die gespeicherte Layer-ID.
+        """
+        value = get_variable("verfahrensgebiet_layer", scope="project")
+        return value or None
+
+    def is_valid_verfahrensgebiet_layer(self, layer) -> bool:
+        """
+        Prüft, ob ein Layer als Verfahrensgebiet geeignet ist.
+        """
+        if not layer_exists(layer):
+            return False
+
+        layer_type = get_layer_type(layer)
+        return layer_type == "vector"

ui/tab_a_ui.py

@@ -0,0 +1,308 @@
+"""
+sn_plan41/ui/tab_a_ui.py – UI für Tab A (Daten)
+"""
+
+from typing import Optional
+
+from sn_basis.functions.qt_wrapper import ( # type: ignore
+    QWidget,
+    QVBoxLayout,
+    QLabel,
+    QPushButton,
+    QToolButton,
+    QFileDialog,
+    QMessageBox,
+    QTabWidget,
+    ToolButtonTextBesideIcon, 
+    ArrowDown, 
+    ArrowRight,
+    SizePolicyPreferred,
+    SizePolicyMaximum,
+
+)
+from sn_basis.functions.qgisui_wrapper import ( # type: ignore
+    QgsFileWidget,
+    QgsMapLayerComboBox,
+    add_dock_widget,
+)
+from sn_basis.functions.qgiscore_wrapper import ( # type: ignore
+    QgsProject,
+    QgsMapLayerProxyModel,
+)
+from sn_basis.functions.message_wrapper import ( # type: ignore
+    info,
+    warning,
+    error,
+)
+from sn_basis.functions.dialog_wrapper import ask_yes_no # type: ignore
+from sn_basis.functions.sys_wrapper import file_exists # type: ignore
+
+from sn_plan41.ui.tab_a_logic import TabALogic # type: ignore
+
+
+class TabA(QWidget):
+    """
+    UI-Klasse für Tab A (Daten).
+    Enthält ausschließlich UI-Code und delegiert Logik an TabALogic.
+    """
+
+  
+
+    def __init__(self, parent=None, build_ui: bool=True):
+        super().__init__(parent)
+        self.parent=parent
+        self.tab_title="Daten"
+
+        self.logic = TabALogic()
+
+        self.verfahrens_db: Optional[str] = None
+        self.lokale_linkliste: Optional[str] = None
+
+        if build_ui:
+            self._build_ui()
+            self._restore_state()
+
+    # ---------------------------------------------------------
+    # UI-Aufbau
+    # ---------------------------------------------------------
+
+    def _build_ui(self) -> None:
+        main_layout = QVBoxLayout()
+        main_layout.setSpacing(4)
+        main_layout.setContentsMargins(4, 4, 4, 4)
+
+        # -------------------------------
+        # Verfahrens-Datenbank
+        # -------------------------------
+
+        self.group_button = QToolButton()
+        self.group_button.setText("Verfahrens-Datenbank")
+        self.group_button.setCheckable(True)
+        self.group_button.setChecked(True)
+        self.group_button.setToolButtonStyle(ToolButtonTextBesideIcon)
+        self.group_button.setArrowType(ArrowDown)
+
+        self.group_button.setStyleSheet("font-weight: bold;")
+        self.group_button.toggled.connect(self._toggle_group)
+        main_layout.addWidget(self.group_button)
+
+        self.group_content = QWidget()
+        self.group_content.setSizePolicy(SizePolicyPreferred, SizePolicyMaximum)
+
+
+        group_layout = QVBoxLayout()
+        group_layout.setSpacing(2)
+        group_layout.setContentsMargins(10, 4, 4, 4)
+
+        group_layout.addWidget(QLabel("bestehende Datei auswählen"))
+
+        self.file_widget = QgsFileWidget()
+        self.file_widget.setStorageMode(QgsFileWidget.GetFile)
+        self.file_widget.setFilter("Geopackage (*.gpkg)")
+        self.file_widget.fileChanged.connect(self._on_verfahrens_db_changed)
+        group_layout.addWidget(self.file_widget)
+
+        group_layout.addWidget(QLabel("-oder-"))
+
+        self.btn_new = QPushButton("Neue Verfahrens-DB anlegen")
+        self.btn_new.clicked.connect(self._create_new_gpkg)
+        group_layout.addWidget(self.btn_new)
+
+        self.group_content.setLayout(group_layout)
+        main_layout.addWidget(self.group_content)
+
+        # -------------------------------
+        # Optionale Linkliste
+        # -------------------------------
+
+        self.optional_button = QToolButton()
+        self.optional_button.setText("Optional: Lokale Linkliste")
+        self.optional_button.setCheckable(True)
+        self.optional_button.setChecked(False)
+        self.optional_button.setToolButtonStyle(ToolButtonTextBesideIcon)
+        self.optional_button.setArrowType(ArrowRight)
+
+        self.optional_button.setStyleSheet("font-weight: bold; margin-top: 6px;")
+        self.optional_button.toggled.connect(self._toggle_optional)
+        main_layout.addWidget(self.optional_button)
+
+        self.optional_content = QWidget()
+        self.optional_content.setSizePolicy(SizePolicyPreferred, SizePolicyMaximum)
+
+        optional_layout = QVBoxLayout()
+        optional_layout.setSpacing(2)
+        optional_layout.setContentsMargins(10, 4, 4, 20)
+
+        optional_layout.addWidget(QLabel("(frei lassen für globale Linkliste)"))
+
+        self.linkliste_widget = QgsFileWidget()
+        self.linkliste_widget.setStorageMode(QgsFileWidget.GetFile)
+        self.linkliste_widget.setFilter("Excelliste (*.xlsx)")
+        self.linkliste_widget.fileChanged.connect(self._on_linkliste_changed)
+        optional_layout.addWidget(self.linkliste_widget)
+
+        self.optional_content.setLayout(optional_layout)
+        self.optional_content.setVisible(False)
+        main_layout.addWidget(self.optional_content)
+
+        # -------------------------------
+        # Layer-Auswahl
+        # -------------------------------
+
+        layer_label = QLabel("Verfahrensgebiet-Layer auswählen")
+        layer_label.setStyleSheet("font-weight: bold; margin-top: 6px;")
+        main_layout.addWidget(layer_label)
+
+        self.layer_combo = QgsMapLayerComboBox()
+        self.layer_combo.setSizePolicy(SizePolicyPreferred, SizePolicyMaximum)
+        self.layer_combo.setFilters(QgsMapLayerProxyModel.VectorLayer)
+        self.layer_combo.layerChanged.connect(self._on_layer_changed)
+        main_layout.addWidget(self.layer_combo)
+
+        main_layout.addStretch(1)
+        self.setLayout(main_layout)
+
+    # ---------------------------------------------------------
+    # State Restore
+    # ---------------------------------------------------------
+
+    def _restore_state(self) -> None:
+        db = self.logic.load_verfahrens_db()
+        if db:
+            self.verfahrens_db = db
+            self.file_widget.setFilePath(db)
+            self._update_group_color()
+
+        link = self.logic.load_linkliste()
+        if link:
+            self.lokale_linkliste = link
+            self.linkliste_widget.setFilePath(link)
+
+        layer_id = self.logic.load_verfahrensgebiet_layer_id()
+        if layer_id:
+            layer = QgsProject.instance().mapLayer(layer_id)
+            if layer:
+                self.layer_combo.setLayer(layer)
+
+    # ---------------------------------------------------------
+    # UI-Callbacks
+    # ---------------------------------------------------------
+
+    def _toggle_group(self, checked: bool):
+        """
+        Klappt den Gruppenbereich ein oder aus.
+        """
+        if not hasattr(self, "group_button"):
+            return
+
+        self.group_button.setArrowType(
+        ArrowDown if checked else ArrowRight
+)
+
+        self.group_content.setVisible(checked)
+
+
+    def _toggle_optional(self, checked: bool):
+        """
+        Klappt den optionalen Bereich ein oder aus.
+        """
+        if not hasattr(self, "optional_button"):
+            return
+
+        self.group_button.setArrowType(
+        ArrowDown if checked else ArrowRight
+)
+
+        self.optional_content.setVisible(checked)
+
+
+    def _on_verfahrens_db_changed(self, path: str) -> None:
+        if not path:
+            self.verfahrens_db = None
+            self.logic.set_verfahrens_db(None)
+            self._update_group_color()
+            return
+
+        if not path.lower().endswith(".gpkg"):
+            path += ".gpkg"
+            self.file_widget.setFilePath(path)
+
+        if not file_exists(path):
+            warning("Datei nicht gefunden", f"Die Datei existiert nicht:\n{path}")
+            self.file_widget.setFilePath("")
+            return
+
+        self.verfahrens_db = path
+        self.logic.set_verfahrens_db(path)
+        self._update_group_color()
+
+    def _on_linkliste_changed(self, path: str) -> None:
+        if not path:
+            self.lokale_linkliste = None
+            self.logic.set_linkliste(None)
+            return
+
+        if not path.lower().endswith(".xlsx"):
+            path += ".xlsx"
+            self.linkliste_widget.setFilePath(path)
+
+        if not file_exists(path):
+            warning("Datei nicht gefunden", f"Die Datei existiert nicht:\n{path}")
+            self.linkliste_widget.setFilePath("")
+            return
+
+        self.lokale_linkliste = path
+        self.logic.set_linkliste(path)
+
+    def _on_layer_changed(self, layer) -> None:
+        self.logic.save_verfahrensgebiet_layer(layer)
+
+    def _create_new_gpkg(self) -> None:
+        file_path, _ = QFileDialog.getSaveFileName(
+            self,
+            "Neue Verfahrens-Datenbank anlegen",
+            "",
+            "Geopackage (*.gpkg)",
+        )
+
+        if not file_path:
+            return
+
+        if not file_path.lower().endswith(".gpkg"):
+            file_path += ".gpkg"
+
+        if file_exists(file_path):
+            overwrite = ask_yes_no(
+                "Datei existiert bereits",
+                f"Die Datei existiert bereits:\n\n{file_path}\n\nSoll sie überschrieben werden?",
+                default=False,
+                parent=self,
+            )
+            if not overwrite:
+                return
+
+        if not self.logic.create_new_verfahrens_db(file_path):
+            error("Fehler", "Die Datei konnte nicht angelegt werden.")
+            return
+
+        self.verfahrens_db = file_path
+        self.file_widget.setFilePath(file_path)
+        self._update_group_color()
+        info("Projekt-DB angelegt", f"Neue Projekt-Datenbank wurde angelegt:\n{file_path}")
+
+    # ---------------------------------------------------------
+    # UI-Helfer
+    # ---------------------------------------------------------
+
+    def _update_group_color(self):
+        """
+        Aktualisiert die Darstellung der Gruppenüberschrift.
+        """
+        if not hasattr(self, "group_button"):
+            return
+
+        if self.verfahrens_db:
+            self.group_button.setStyleSheet("font-weight: bold;")
+        else:
+            self.group_button.setStyleSheet("")
+

ui/tabs/tab_a.py

@@ -1,12 +0,0 @@
-from qgis.PyQt.QtWidgets import QWidget, QVBoxLayout, QLabel, QLineEdit
-
-class TabA(QWidget):
-    tab_title = "Tab A"
-    
-    def __init__(self, parent=None):
-        super().__init__(parent)
-        layout = QVBoxLayout()
-        layout.addWidget(QLabel("Plugin2 – Tab A"))
-        layout.addWidget(QLineEdit("Feld A1"))
-        layout.addWidget(QLineEdit("Feld A2"))
-        self.setLayout(layout)