Fem: Expose Constraint view provider symbol node to Python

src/Mod/Fem/Gui/CMakeLists.txt

@@ -35,10 +35,13 @@ set(FemGui_LIBS
     PartGui
 )
 
+generate_from_xml(ViewProviderFemConstraintPy)
 generate_from_xml(ViewProviderFemMeshPy)
 generate_from_xml(ViewProviderFemPostPipelinePy)
 
 SET(Python_SRCS
+    ViewProviderFemConstraintPy.xml
+    ViewProviderFemConstraintPyImp.cpp
     ViewProviderFemMeshPy.xml
     ViewProviderFemMeshPyImp.cpp
     ViewProviderFemPostPipelinePy.xml

src/Mod/Fem/Gui/ViewProviderFemConstraint.cpp

@@ -47,6 +47,7 @@
 
 #include "TaskFemConstraint.h"
 #include "ViewProviderFemConstraint.h"
+#include "ViewProviderFemConstraintPy.h"
 
 
 using namespace FemGui;
@@ -215,6 +216,15 @@ void ViewProviderFemConstraint::unsetEdit(int ModNum)
         }
     }
 }
+
+PyObject* ViewProviderFemConstraint::getPyObject()
+{
+    if (!pyViewObject) {
+        pyViewObject = new ViewProviderFemConstraintPy(this);
+    }
+    pyViewObject->IncRef();
+    return pyViewObject;
+}
 /*
 // Create a local coordinate system with the z-axis given in dir
 void getLocalCoordinateSystem(const SbVec3f& z, SbVec3f& y, SbVec3f& x)

src/Mod/Fem/Gui/ViewProviderFemConstraint.h

@@ -72,10 +72,17 @@ public:
     std::vector<App::DocumentObject*> claimChildren() const override;
     void setupContextMenu(QMenu*, QObject*, const char*) override;
 
+    PyObject* getPyObject() override;
+
     /// Highlight the references that have been selected
     virtual void highlightReferences(const bool /* on */)
     {}
 
+    SoSeparator* getSymbolSeparator() const
+    {
+        return pShapeSep;
+    }
+
     static std::string gethideMeshShowPartStr();
     static std::string gethideMeshShowPartStr(const std::string showConstr);
 

src/Mod/Fem/Gui/ViewProviderFemConstraintPy.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<GenerateModel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="generateMetaModel_Module.xsd">
+    <PythonExport
+        Father="ViewProviderDocumentObjectPy"
+        Name="ViewProviderFemConstraintPy"
+        Twin="ViewProviderFemConstraint"
+        TwinPointer="ViewProviderFemConstraint"
+        Include="Mod/Fem/Gui/ViewProviderFemConstraint.h"
+        Namespace="FemGui"
+        FatherInclude="Gui/ViewProviderDocumentObjectPy.h"
+        FatherNamespace="Gui">
+        <Documentation>
+            <Author Licence="LGPL" Name="Mario Passaglia" EMail="mpassaglia@cbc.ub.ar" />
+            <UserDocu>This is the ViewProviderFemConstraint class</UserDocu>
+        </Documentation>
+        <Attribute Name="SymbolNode" ReadOnly="true">
+            <Documentation>
+                <UserDocu>A pivy SoSeparator with the nodes of the constraint symbols</UserDocu>
+            </Documentation>
+            <Parameter Name="SymbolNode" Type="Object" />
+        </Attribute>
+    </PythonExport>
+</GenerateModel>

src/Mod/Fem/Gui/ViewProviderFemConstraintPyImp.cpp

@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+/***************************************************************************
+ *   Copyright (c) 2024 Mario Passaglia <mpassaglia[at]cbc.uba.ar>         *
+ *                                                                         *
+ *   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/>.                                      *
+ *                                                                         *
+ **************************************************************************/
+
+#include "PreCompiled.h"
+#ifndef _PreComp_
+#include <Inventor/nodes/SoSeparator.h>
+#endif
+
+#include <Base/Interpreter.h>
+
+#include "ViewProviderFemConstraintPy.h"
+#include "ViewProviderFemConstraintPy.cpp"
+
+
+using namespace FemGui;
+
+// returns a string which represent the object e.g. when printed in python
+std::string ViewProviderFemConstraintPy::representation() const
+{
+    std::stringstream str;
+    str << "<View provider FemConstraint object at " << getViewProviderFemConstraintPtr() << ">";
+
+    return str.str();
+}
+
+
+Py::Object ViewProviderFemConstraintPy::getSymbolNode() const
+{
+    try {
+        SoSeparator* sep = getViewProviderFemConstraintPtr()->getSymbolSeparator();
+        PyObject* Ptr =
+            Base::Interpreter().createSWIGPointerObj("pivy.coin", "_p_SoSeparator", sep, 1);
+
+        sep->ref();
+
+        return Py::Object(Ptr, true);
+    }
+    catch (const Base::Exception& e) {
+        throw Py::RuntimeError(e.what());
+    }
+}
+
+PyObject* ViewProviderFemConstraintPy::getCustomAttributes(const char* /*attr*/) const
+{
+    return nullptr;
+}
+
+int ViewProviderFemConstraintPy::setCustomAttributes(const char* /*attr*/, PyObject* /*obj*/)
+{
+    return 0;
+}