Wrappe modular aufgebaut, Tests erfolgreich, Menüleiste und Werzeugleiste werden eingetragen (QT6 und QT5)- (Es fehlen noch Fachplugins, um zu prüfen, ob es auch wirklich in QGIS geht)

functions/variable_wrapper.py

@@ -0,0 +1,115 @@
+"""
+variable_wrapper.py – QGIS-Variablen-Abstraktion
+"""
+
+from typing import Any
+
+from sn_basis.functions.qgiscore_wrapper import QgsProject
+
+
+# ---------------------------------------------------------
+# Versuch: QgsExpressionContextUtils importieren
+# ---------------------------------------------------------
+
+try:
+    from qgis.core import QgsExpressionContextUtils
+
+    _HAS_QGIS_VARIABLES = True
+
+# ---------------------------------------------------------
+# Mock-Modus
+# ---------------------------------------------------------
+
+except Exception:
+    _HAS_QGIS_VARIABLES = False
+
+    class _MockVariableStore:
+        global_vars: dict[str, str] = {}
+        project_vars: dict[str, str] = {}
+
+    class QgsExpressionContextUtils:
+        @staticmethod
+        def setGlobalVariable(name: str, value: str) -> None:
+            _MockVariableStore.global_vars[name] = value
+
+        @staticmethod
+        def globalScope():
+            class _Scope:
+                def variable(self, name: str) -> str:
+                    return _MockVariableStore.global_vars.get(name, "")
+
+            return _Scope()
+
+        @staticmethod
+        def setProjectVariable(project: Any, name: str, value: str) -> None:
+            _MockVariableStore.project_vars[name] = value
+
+        @staticmethod
+        def projectScope(project: Any):
+            class _Scope:
+                def variable(self, name: str) -> str:
+                    return _MockVariableStore.project_vars.get(name, "")
+
+            return _Scope()
+
+
+# ---------------------------------------------------------
+# Öffentliche API
+# ---------------------------------------------------------
+
+def get_variable(key: str, scope: str = "project") -> str:
+    """
+    Liest eine QGIS-Variable.
+
+    :param key: Variablenname ohne Prefix
+    :param scope: 'project' oder 'global'
+    """
+    var_name = f"sn_{key}"
+
+    if scope == "project":
+        project = QgsProject.instance()
+        return (
+            QgsExpressionContextUtils
+            .projectScope(project)
+            .variable(var_name)
+            or ""
+        )
+
+    if scope == "global":
+        return (
+            QgsExpressionContextUtils
+            .globalScope()
+            .variable(var_name)
+            or ""
+        )
+
+    raise ValueError("Scope muss 'project' oder 'global' sein.")
+
+
+def set_variable(key: str, value: str, scope: str = "project") -> None:
+    """
+    Setzt eine QGIS-Variable.
+
+    :param key: Variablenname ohne Prefix
+    :param value: Wert
+    :param scope: 'project' oder 'global'
+    """
+    var_name = f"sn_{key}"
+
+    if scope == "project":
+        project = QgsProject.instance()
+        QgsExpressionContextUtils.setProjectVariable(
+            project,
+            var_name,
+            value,
+        )
+        return
+
+    if scope == "global":
+        QgsExpressionContextUtils.setGlobalVariable(
+            var_name,
+            value,
+        )
+        return
+
+    raise ValueError("Scope muss 'project' oder 'global' sein.")