+ FEM: Support drag and drop for analysis object

src/Mod/Fem/Gui/ViewProviderAnalysis.cpp

@@ -34,6 +34,7 @@
 #include <Gui/Control.h>
 
 #include <Mod/Fem/App/FemAnalysis.h>
+#include <Mod/Fem/App/FemMeshObject.h>
 
 #include "TaskDlgAnalysis.h"
 
@@ -159,6 +160,39 @@ bool ViewProviderFemAnalysis::onDelete(const std::vector<std::string> &)
     return true;
 }
 
+bool ViewProviderFemAnalysis::canDragObjects() const
+{
+    return true;
+}
+
+void ViewProviderFemAnalysis::dragObject(App::DocumentObject* obj)
+{
+    Fem::FemAnalysis* analyze = static_cast<Fem::FemAnalysis*>(getObject());
+    std::vector<App::DocumentObject*> fem = analyze->Member.getValues();
+    for (std::vector<App::DocumentObject*>::iterator it = fem.begin(); it != fem.end(); ++it) {
+        if (*it == obj) {
+            fem.erase(it);
+            analyze->Member.setValues(fem);
+            break;
+        }
+    }
+}
+
+bool ViewProviderFemAnalysis::canDropObjects() const
+{
+    return true;
+}
+
+void ViewProviderFemAnalysis::dropObject(App::DocumentObject* obj)
+{
+    if (!obj || !obj->getTypeId().isDerivedFrom(Fem::FemMeshObject::getClassTypeId()))
+        return;
+    Fem::FemAnalysis* analyze = static_cast<Fem::FemAnalysis*>(getObject());
+    std::vector<App::DocumentObject*> fem = analyze->Member.getValues();
+    fem.push_back(obj);
+    analyze->Member.setValues(fem);
+}
+
 // Python feature -----------------------------------------------------------------------
 
 namespace Gui {

src/Mod/Fem/Gui/ViewProviderAnalysis.h

@@ -63,6 +63,18 @@ public:
     // shows solid in the tree
     virtual bool isShow(void) const{return true;}
 
+    /** @name Drag and drop */
+    //@{
+    /// Returns true if the view provider generally supports dragging objects
+    bool canDragObjects() const;
+    /// Starts to drag the object
+    void dragObject(App::DocumentObject*);
+    /// Returns true if the view provider generally accepts dropping of objects
+    bool canDropObjects() const;
+    /// If the dropped object type is accepted the object will be added as child
+    void dropObject(App::DocumentObject*);
+    //@}
+
 protected:
     virtual bool setEdit(int ModNum);
     virtual void unsetEdit(int ModNum);