Merge pull request 'fix: Access Violation beim Beenden von QGIS in PrintTab beheben' (#27) from bug/crash_on_exit into unstable

Reviewed-on: #27

ui/tabs/__init__.py

@@ -1,4 +1,4 @@
-from sn_basis.ui.tabs.print_tab import PrintTab
-from sn_basis.ui.tabs.settings_tab import SettingsTab
+# from sn_basis.ui.tabs.print_tab import PrintTab
+# from sn_basis.ui.tabs.settings_tab import SettingsTab
 
-__all__ = ["PrintTab", "SettingsTab"]
+# __all__ = ["PrintTab", "SettingsTab"]

ui/tabs/print_tab.py

@@ -13,6 +13,7 @@ from sn_basis.functions.qt_wrapper import (
     QCheckBox,
     QHBoxLayout,
     QPushButton,
+    QCoreApplication,
 )
 from sn_basis.functions.qgiscore_wrapper import QgsProject
 from sn_basis.functions.qgisui_wrapper import iface
@@ -57,9 +58,11 @@ class PrintTab(QWidget):
 
     def __init__(self, parent: Optional[Any] = None):
         super().__init__(parent)
-
         self.pruefmanager: Optional[Pruefmanager] = None
-        self.logic: Optional[PrintLogic] = None
+        self.logic = PrintLogic(self.pruefmanager)
+
+        
+        #self.logic: Optional[PrintLogic] = None
         self._kartenname_combo: Optional[Any] = None
         self._massstab_combo: Optional[Any] = None
         self._thema_combo: Optional[Any] = None
@@ -76,6 +79,13 @@ class PrintTab(QWidget):
         self._connect_theme_collection_signals()
         self._connect_project_signals()
 
+        app = QCoreApplication.instance()
+        if app is not None:
+            try:
+                app.aboutToQuit.connect(self._cleanup_signals)
+            except Exception:
+                pass
+
     def set_services(self, pruefmanager: Pruefmanager, data_grabber: DataGrabber) -> None:
         _ = data_grabber
         self.pruefmanager = pruefmanager
@@ -340,6 +350,24 @@ class PrintTab(QWidget):
             druckbereich_auswahl=self._druckbereich_combo.currentText() if self._druckbereich_combo else DRUCKBEREICH_VERFAHRENSGEBIET,
         )
 
+    def _cleanup_signals(self) -> None:
+        """Trennt alle QGIS-Signalverbindungen vor dem Beenden von QGIS."""
+        self._disconnect_theme_collection_signals()
+        try:
+            project = QgsProject.instance()
+            if project is None:
+                return
+            for signal_name in ("readProject", "newProjectCreated", "cleared"):
+                signal = getattr(project, signal_name, None)
+                if signal is None:
+                    continue
+                try:
+                    signal.disconnect(self._on_project_changed)
+                except Exception:
+                    pass
+        except Exception:
+            pass
+
     def _connect_project_signals(self) -> None:
         project = QgsProject.instance()
         for signal_name in ("readProject", "newProjectCreated", "cleared"):