From d84c2d354447dbbcbbbd4915ec4c95a0c9fe79e1 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 11 Aug 2017 12:53:35 +0200
Subject: [PATCH] drag and drop for compound objects

---
 src/Mod/Part/Gui/ViewProviderCompound.cpp | 41 +++++++++++++++++++++++
 src/Mod/Part/Gui/ViewProviderCompound.h   |  8 +++++
 2 files changed, 49 insertions(+)

diff --git a/src/Mod/Part/Gui/ViewProviderCompound.cpp b/src/Mod/Part/Gui/ViewProviderCompound.cpp
index 609fa23608..61b286c17c 100644
--- a/src/Mod/Part/Gui/ViewProviderCompound.cpp
+++ b/src/Mod/Part/Gui/ViewProviderCompound.cpp
@@ -113,3 +113,44 @@ void ViewProviderCompound::updateData(const App::Property* prop)
         }
     }
 }
+
+bool ViewProviderCompound::canDragObjects() const
+{
+    return true;
+}
+
+bool ViewProviderCompound::canDragObject(App::DocumentObject* obj) const
+{
+    return obj->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId());
+}
+
+void ViewProviderCompound::dragObject(App::DocumentObject* obj)
+{
+    Part::Compound* pComp = static_cast<Part::Compound*>(getObject());
+    std::vector<App::DocumentObject*> pShapes = pComp->Links.getValues();
+    for (std::vector<App::DocumentObject*>::iterator it = pShapes.begin(); it != pShapes.end(); ++it) {
+        if (*it == obj) {
+            pShapes.erase(it);
+            pComp->Links.setValues(pShapes);
+            break;
+        }
+    }
+}
+
+bool ViewProviderCompound::canDropObjects() const
+{
+    return true;
+}
+
+bool ViewProviderCompound::canDropObject(App::DocumentObject* obj) const
+{
+    return obj->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId());
+}
+
+void ViewProviderCompound::dropObject(App::DocumentObject* obj)
+{
+    Part::Compound* pComp = static_cast<Part::Compound*>(getObject());
+    std::vector<App::DocumentObject*> pShapes = pComp->Links.getValues();
+    pShapes.push_back(obj);
+    pComp->Links.setValues(pShapes);
+}
diff --git a/src/Mod/Part/Gui/ViewProviderCompound.h b/src/Mod/Part/Gui/ViewProviderCompound.h
index 1ec37b6282..e72b9b278b 100644
--- a/src/Mod/Part/Gui/ViewProviderCompound.h
+++ b/src/Mod/Part/Gui/ViewProviderCompound.h
@@ -41,6 +41,14 @@ public:
     std::vector<App::DocumentObject*> claimChildren() const;
     bool onDelete(const std::vector<std::string> &);
 
+    /// drag and drop
+    bool canDragObjects() const;
+    bool canDragObject(App::DocumentObject*) const;
+    void dragObject(App::DocumentObject*);
+    bool canDropObjects() const;
+    bool canDropObject(App::DocumentObject*) const;
+    void dropObject(App::DocumentObject*);
+
 protected:
     void updateData(const App::Property*);
 };