[Measure] Add features, viewproviders and preferences for unified measurement facility

src/Mod/Measure/UtilsMeasure.py

@@ -0,0 +1,52 @@
+# /***************************************************************************
+#  *   Copyright (c) 2023 David Friedli <david[at]friedli-be.ch>             *
+#  *                                                                         *
+#  *   This file is part of FreeCAD.                                         *
+#  *                                                                         *
+#  *   FreeCAD is free software: you can redistribute it and/or modify it    *
+#  *   under the terms of the GNU Lesser General Public License as           *
+#  *   published by the Free Software Foundation, either version 2.1 of the  *
+#  *   License, or (at your option) any later version.                       *
+#  *                                                                         *
+#  *   FreeCAD is distributed in the hope that it will be useful, but        *
+#  *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+#  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
+#  *   Lesser General Public License for more details.                       *
+#  *                                                                         *
+#  *   You should have received a copy of the GNU Lesser General Public      *
+#  *   License along with FreeCAD. If not, see                               *
+#  *   <https://www.gnu.org/licenses/>.                                      *
+#  *                                                                         *
+#  **************************************************************************/
+
+from abc import ABC, abstractmethod, abstractclassmethod
+from typing import List, Tuple
+
+class MeasureBasePython(ABC):
+
+    @abstractclassmethod
+    def isValidSelection(cls, selection):
+        """Returns True if the given selection is valid for this measurment"""
+        pass
+
+    @abstractclassmethod
+    def isPrioritySelection(cls, selection):
+        """Returns True if creation of this measurment should be priorized over other measurements for the given selection"""
+        pass
+
+    @abstractclassmethod
+    def getInputProps(cls) -> Tuple[str]:
+        """Returns all properties that the measurement's result depends on"""
+        return ()
+
+    @abstractmethod
+    def getSubject(self, obj) -> Tuple:
+        """Returns all objects that are measured, this is used to autohide the measurement if the relevant elements are not visible"""
+        return []
+
+    @abstractmethod
+    def parseSelection(self, obj, selection):
+        """Sets the measurements properties from the given selection"""
+        pass
+
+