Added beginings of Text implementation

include/osgPresentation/Element

@@ -15,6 +15,8 @@
 #define OSGPRESENTATION_ELEMENT 1
 
 #include <osgPresentation/Group>
+#include <osgUtil/UpdateVisitor>
+#include <osgGA/EventVisitor>
 
 namespace osgPresentation {
 
@@ -31,6 +33,31 @@ class OSGPRESENTATION_EXPORT Element : public osgPresentation::Group
 
         META_Node(osgPresentation, Element);
 
+        virtual void traverse(osg::NodeVisitor& nv);
+
+        /** Load the subgraph implementation of the element.*/
+        virtual bool load() { return false; }
+
+        /** Remove the the subgraph implementation, freeing up space.*/
+        virtual bool unload() { removeChildren(0, getNumChildren()); return true; }
+
+        /** Return true if the subgraph implementation has been loaded.*/
+        virtual bool loaded() const { return getNumChildren()!=0; }
+
+
+        /** Do updates as part of the update traversal.*/
+        virtual void updateTraversal(osgUtil::UpdateVisitor& uv);
+
+        /** Do updates as part of the event traversal.*/
+        virtual void eventTraversal(osgGA::EventVisitor& ev);
+
+        /** Enter the element for the first time, starting any animations, movies, audio etc..*/
+        virtual void enter() {}
+
+        /** Leave the element, stopping any animations, movies, audio etc..*/
+        virtual void leave() {}
+
+
 protected :
 
         virtual ~Element() {}

include/osgPresentation/Group

@@ -19,6 +19,10 @@
 
 namespace osgPresentation {
 
+
+typedef std::pair< osg::ref_ptr<osg::Object>, std::string> ObjectDescription;
+typedef std::list< ObjectDescription > PropertyList;
+
 /** osgPresentation::Group
 */
 class OSGPRESENTATION_EXPORT Group : public osg::MatrixTransform
@@ -49,6 +53,10 @@ class OSGPRESENTATION_EXPORT Group : public osg::MatrixTransform
             return setUserValue(name, value);
         }
 
+        /** Get all types of Properties supported by Presentation Object type, return true if the Properties are supported, false otherwise.*/
+        virtual bool getSupportedProperties(PropertyList&) { return false; }
+
+
     protected :
 
         virtual ~Group() {}

include/osgPresentation/Text

@@ -31,6 +31,12 @@ class OSGPRESENTATION_EXPORT Text : public osgPresentation::Element
 
         META_Node(osgPresentation, Text);
 
+        /** load the text subgraph.*/
+        virtual bool load();
+
+        /** Get all types of Properties supported by Presentation Object type, return true if the Properties are supported, false otherwise.*/
+        virtual bool getSupportedProperties(PropertyList&);
+
 protected :
 
         virtual ~Text() {}