Fem: Add suppressible extension to objects - fixes #12115

src/Mod/Fem/App/FemMeshObject.cpp

@@ -41,6 +41,8 @@ FemMeshObject::FemMeshObject()
     ADD_PROPERTY_TYPE(FemMesh, (), "FEM Mesh", Prop_NoRecompute, "FEM Mesh object");
     // in the regard of recomputes see:
     // https://forum.freecad.org/viewtopic.php?f=18&t=33329#p279203
+
+    suppressibleExt.initExtension(this);
 }
 
 FemMeshObject::~FemMeshObject() = default;

src/Mod/Fem/App/FemMeshObject.h

@@ -25,6 +25,7 @@
 
 #include <App/FeaturePython.h>
 #include <App/GeoFeature.h>
+#include <App/SuppressibleExtension.h>
 
 #include "FemMesh.h"
 #include "FemMeshProperty.h"
@@ -63,6 +64,9 @@ public:
 protected:
     /// get called by the container when a property has changed
     void onChanged(const App::Property* prop) override;
+
+private:
+    App::SuppressibleExtension suppressibleExt;
 };
 
 using FemMeshObjectPython = App::FeaturePythonT<FemMeshObject>;

src/Mod/Fem/Gui/ViewProviderFemMesh.cpp

@@ -220,6 +220,8 @@ ViewProviderFemMesh::ViewProviderFemMesh()
                       App::Prop_Hidden,
                       "Node diffuse color array");
 
+    suppressibleExt.initExtension(this);
+
     ColorMode.setEnums(colorModeEnum);
     onlyEdges = false;
 

src/Mod/Fem/Gui/ViewProviderFemMesh.h

@@ -26,6 +26,7 @@
 #include <Gui/ViewProviderBuilder.h>
 #include <Gui/ViewProviderGeometryObject.h>
 #include <Gui/ViewProviderFeaturePython.h>
+#include <Gui/ViewProviderSuppressibleExtension.h>
 #include <Mod/Fem/FemGlobal.h>
 
 class SoCoordinate3;
@@ -144,6 +145,7 @@ public:
 private:
     static App::PropertyFloatConstraint::Constraints floatRange;
     static const char* colorModeEnum[];
+    Gui::ViewProviderSuppressibleExtension suppressibleExt;
 
 protected:
     /// get called by the container whenever a property has been changed

src/Mod/Fem/femobjects/base_femelement.py

@@ -45,6 +45,8 @@ class BaseFemElement(base_fempythonobject.BaseFemPythonObject):
         for prop in self._get_properties():
             prop.add_to_object(obj)
 
+        obj.addExtension("App::SuppressibleExtensionPython")
+
     def _get_properties(self):
         prop = []
 
@@ -71,3 +73,6 @@ class BaseFemElement(base_fempythonobject.BaseFemPythonObject):
             if prop.name == "References":
                 # change References to App::PropertyLinkSubListGlobal
                 prop.handle_change_type(obj, old_type="App::PropertyLinkSubList")
+
+        if not obj.hasExtension("App::SuppressibleExtensionPython"):
+            obj.addExtension("App::SuppressibleExtensionPython")

src/Mod/Fem/femobjects/material_common.py

@@ -49,6 +49,8 @@ class MaterialCommon(base_fempythonobject.BaseFemPythonObject):
         for prop in self._get_properties():
             prop.add_to_object(obj)
 
+        obj.addExtension("App::SuppressibleExtensionPython")
+
     def _get_properties(self):
         prop = []
 
@@ -95,6 +97,9 @@ class MaterialCommon(base_fempythonobject.BaseFemPythonObject):
                 # change References to App::PropertyLinkSubListGlobal
                 prop.handle_change_type(obj, old_type="App::PropertyLinkSubList")
 
+        if not obj.hasExtension("App::SuppressibleExtensionPython"):
+            obj.addExtension("App::SuppressibleExtensionPython")
+
         """
         Some remarks to the category. Not finished, thus to be continued.
 

src/Mod/Fem/femobjects/material_mechanicalnonlinear.py

@@ -43,6 +43,8 @@ class MaterialMechanicalNonlinear(base_fempythonobject.BaseFemPythonObject):
         super().__init__(obj)
         self.add_properties(obj)
 
+        obj.addExtension("App::SuppressibleExtensionPython")
+
     def onDocumentRestored(self, obj):
 
         # YieldPoints was (until 0.19) stored as 3 separate variables. Consolidate them if present.
@@ -64,6 +66,8 @@ class MaterialMechanicalNonlinear(base_fempythonobject.BaseFemPythonObject):
         if yield_points:
             obj.YieldPoints = yield_points
 
+        if not obj.hasExtension("App::SuppressibleExtensionPython"):
+            obj.addExtension("App::SuppressibleExtensionPython")
         # TODO: If in the future more nonlinear options are added, update choices here.
 
     def add_properties(self, obj):

src/Mod/Fem/femtools/checksanalysis.py

@@ -60,7 +60,7 @@ def check_member_for_solver_calculix(analysis, solver, mesh, member):
 
     # mesh
     if not mesh:
-        message += "No mesh object defined in the analysis.\n"
+        message += "A single mesh object must be defined in the analysis.\n"
     if mesh:
         if (
             mesh.FemMesh.VolumeCount == 0

src/Mod/Fem/femtools/membertools.py

@@ -141,11 +141,7 @@ def get_mesh_to_solve(analysis):
     """
     mesh_to_solve = None
     for m in analysis.Group:
-        if (
-            m.isDerivedFrom("Fem::FemMeshObject")
-            # the next line should not be needed as the result mesh is not a analysis member
-            and not femutils.is_of_type(m, "Fem::MeshResult")
-        ):
+        if m.isDerivedFrom("Fem::FemMeshObject") and not m.Suppressed:
             if not mesh_to_solve:
                 mesh_to_solve = m
             else:

src/Mod/Fem/femviewprovider/view_base_femelement.py

@@ -35,5 +35,9 @@ from femviewprovider import view_base_femobject
 class VPBaseFemElement(view_base_femobject.VPBaseFemObject):
     """Proxy View Provider for Python base element."""
 
+    def __init__(self, vobj):
+        super().__init__(vobj)
+        vobj.addExtension("Gui::ViewProviderSuppressibleExtensionPython")
+
     def isShow(self):
         return self.ViewObject.Visibility

src/Mod/Fem/femviewprovider/view_base_femmaterial.py

@@ -35,5 +35,9 @@ from femviewprovider import view_base_femobject
 class VPBaseFemMaterial(view_base_femobject.VPBaseFemObject):
     """Proxy View Provider for Python base material."""
 
+    def __init__(self, vobj):
+        super().__init__(vobj)
+        vobj.addExtension("Gui::ViewProviderSuppressibleExtensionPython")
+
     def isShow(self):
         return self.ViewObject.Visibility