Get Canvas/PropertyBasedElement by name

simgear/canvas/CanvasMgr.cxx

@@ -55,6 +55,12 @@ namespace canvas
     return boost::static_pointer_cast<Canvas>( getElement(index) );
   }
 
+  //----------------------------------------------------------------------------
+  CanvasPtr CanvasMgr::getCanvas(const std::string& name) const
+  {
+    return boost::static_pointer_cast<Canvas>( getElement(name) );
+  }
+
   //----------------------------------------------------------------------------
   void CanvasMgr::elementCreated(PropertyBasedElementPtr element)
   {

simgear/canvas/CanvasMgr.hxx

@@ -55,6 +55,14 @@ namespace canvas
        */
       CanvasPtr getCanvas(size_t index) const;
 
+      /**
+       * Get ::Canvas by name
+       *
+       * @param name Value of child node "name" in
+       *             /canvas/by-index/texture[i]/name
+       */
+      CanvasPtr getCanvas(const std::string& name) const;
+
     protected:
 
       SystemAdapterPtr _system_adapter;

simgear/nasal/cppbind/Ghost.hxx

@@ -655,6 +655,9 @@ namespace nasal
 
       static naRef makeGhost(naContext c, void *ptr)
       {
+        if( !Ghost::getRawPtr(ptr) )
+          return naNil();
+
         naGhostType* ghost_type = 0;
         if( Ghost::returns_dynamic_type::value )
           // For pointer policies already returning instances of an object with

simgear/props/PropertyBasedMgr.cxx

@@ -18,6 +18,8 @@
 
 #include "PropertyBasedMgr.hxx"
 
+#include <boost/foreach.hpp>
+
 #include <stdexcept>
 #include <string>
 
@@ -65,6 +67,20 @@ namespace simgear
     return _elements[index];
   }
 
+  //----------------------------------------------------------------------------
+  PropertyBasedElementPtr
+  PropertyBasedMgr::getElement(const std::string& name) const
+  {
+    if( name.empty() )
+      return PropertyBasedElementPtr();
+
+    BOOST_FOREACH(PropertyBasedElementPtr el, _elements)
+      if( el->getProps()->getStringValue("name") == name )
+        return el;
+
+    return PropertyBasedElementPtr();
+  }
+
   //----------------------------------------------------------------------------
   const SGPropertyNode* PropertyBasedMgr::getPropertyRoot() const
   {

simgear/props/PropertyBasedMgr.hxx

@@ -53,6 +53,13 @@ namespace simgear
        */
       PropertyBasedElementPtr getElement(size_t index) const;
 
+      /**
+       * Get an existing PropertyBasedElement by its name
+       *
+       * @param name    Name (value of child node "name" will be matched)
+       */
+      PropertyBasedElementPtr getElement(const std::string& name) const;
+
       virtual const SGPropertyNode* getPropertyRoot() const;
 
     protected: