From 2585598c55974cf3c2c2ab42d8004fb8d1e44047 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Tr=C3=B6ger?= <stefantroeger@gmx.net>
Date: Fri, 15 Jan 2016 19:24:57 +0100
Subject: [PATCH] prevent parts from being dragged into parts

---
 src/Gui/ViewProviderPart.cpp | 10 ++++++++++
 src/Gui/ViewProviderPart.h   |  1 +
 2 files changed, 11 insertions(+)

diff --git a/src/Gui/ViewProviderPart.cpp b/src/Gui/ViewProviderPart.cpp
index 5ffb8ba81..7ca34d7a0 100644
--- a/src/Gui/ViewProviderPart.cpp
+++ b/src/Gui/ViewProviderPart.cpp
@@ -72,6 +72,16 @@ bool ViewProviderPart::doubleClicked(void)
     return true;
 }
 
+bool ViewProviderPart::canDropObject(App::DocumentObject* obj) const {
+    
+    //it is not allowed to have any part or assembly object within a part, hence we exclude origin groups
+    if(obj->isDerivedFrom(App::OriginGroup::getClassTypeId()))
+        return false;
+    
+    return Gui::ViewProvider::canDropObject(obj);
+}
+
+
 /**
  * Returns the pixmap for the list item.
  */
diff --git a/src/Gui/ViewProviderPart.h b/src/Gui/ViewProviderPart.h
index d9c4020ad..53bf882e7 100644
--- a/src/Gui/ViewProviderPart.h
+++ b/src/Gui/ViewProviderPart.h
@@ -44,6 +44,7 @@ public:
     QIcon getIcon(void) const;
 
     virtual bool doubleClicked(void);
+    virtual bool canDropObject(App::DocumentObject*) const;
 protected:
     /// get called by the container whenever a property has been changed
     virtual void onChanged(const App::Property* prop);