Drag&Drop test on Linux and OSX

xs/src/slic3r/GUI/GUI_ObjectParts.hpp

@@ -7,6 +7,7 @@ class wxBoxSizer;
 class wxString;
 class wxArrayString;
 class wxMenu;
+class wxDataViewEvent;
 
 namespace Slic3r {
 class ModelObject;
@@ -109,6 +110,10 @@ void update_rotation_values();
 // update rotation value after "gizmos"
 void update_rotation_value(const double angle, const std::string& axis);
 
+void on_begin_drag(wxDataViewEvent &event);
+void on_drop_possible(wxDataViewEvent &event);
+void on_drop(wxDataViewEvent &event);
+
 } //namespace GUI
 } //namespace Slic3r 
 #endif  //slic3r_GUI_ObjectParts_hpp_