[FEM] Elecrostatic: use App::PropertyElectricPotential

src/Mod/Fem/femobjects/constraint_electrostaticpotential.py

@@ -30,6 +30,7 @@ __url__ = "https://www.freecadweb.org"
 #  \ingroup FEM
 #  \brief constraint electrostatic potential object
 
+from FreeCAD import Units
 from . import base_fempythonobject
 
 
@@ -47,10 +48,10 @@ class ConstraintElectrostaticPotential(base_fempythonobject.BaseFemPythonObject)
     def add_properties(self, obj):
         if not hasattr(obj, "Potential"):
             obj.addProperty(
-                "App::PropertyFloat",
+                "App::PropertyElectricPotential",
                 "Potential",
                 "Parameter",
-                "Potential"
+                "Electric Potential"
             ),
             obj.Potential = 0.0
 

src/Mod/Fem/femsolver/elmer/writer.py

@@ -462,10 +462,9 @@ class Writer(object):
         for obj in self._getMember("Fem::ConstraintElectrostaticPotential"):
             if obj.References:
                 for name in obj.References[0][1]:
-                    # https://forum.freecadweb.org/viewtopic.php?f=18&t=41488&start=10#p369454  ff
                     if obj.PotentialEnabled:
                         if hasattr(obj, "Potential"):
-                            potential = self._getFromUi(obj.Potential, "V", "M*L^2/(T^3 * I)")
+                            potential = float(obj.Potential.getValueAs("V"))
                             self._boundary(name, "Potential", potential)
                     if obj.PotentialConstant:
                         self._boundary(name, "Potential Constant", True)

src/Mod/Fem/femtaskpanels/task_constraint_electrostaticpotential.py

@@ -91,10 +91,8 @@ class _TaskPanel(object):
                 self._part.ViewObject.hide()
 
     def _initParamWidget(self):
-        unit = "V"
-        quantity = Units.Quantity("{} {}".format(self._obj.Potential, unit))
         self._paramWidget.potentialQSB.setProperty(
-            'value', quantity)
+            'value', self._obj.Potential)
         self._paramWidget.potentialBox.setChecked(
             not self._obj.PotentialEnabled)
         self._paramWidget.potentialConstantBox.setChecked(
@@ -125,13 +123,12 @@ class _TaskPanel(object):
                 potential = Units.Quantity(self._paramWidget.potentialQSB.text())
             except ValueError:
                 FreeCAD.Console.PrintMessage(
-                    "Wrong input. OK has been triggered without a green hook "
-                    "in the input field. Not recognised input: '{}' "
+                    "Wrong input. Not recognised input: '{}' "
                     "Potential has not been set.\n"
-                    .format(self._paramWidget.potentialTxt.text())
+                    .format(self._paramWidget.potentialQSB.text())
                 )
             if potential is not None:
-                self._obj.Potential = potential.getValueAs(unit).Value
+                self._obj.Potential = potential
 
         self._obj.PotentialConstant = self._paramWidget.potentialConstantBox.isChecked()