Further work on osg::ImageSequence/osgDB::ImagePager

include/osg/NodeVisitor

@@ -284,6 +284,30 @@ class OSG_EXPORT NodeVisitor : public virtual Referenced
         const DatabaseRequestHandler* getDatabaseRequestHandler() const { return _databaseRequestHandler.get(); }
 
 
+        /** Callback for managing database paging, such as generated by PagedLOD nodes.*/
+        class ImageRequestHandler : public osg::Referenced
+        {
+        public:
+        
+            ImageRequestHandler():
+                Referenced(true) {}
+        
+            virtual void requestNodeFile(const std::string& fileName,osg::Object* attachmentPoint, double timeToMergeBy, const FrameStamp* framestamp, osg::ref_ptr<osg::Referenced>& imageRequest) = 0;
+            
+        protected:
+            virtual ~ImageRequestHandler() {}
+        };
+        
+        /** Set the handler for image requests.*/
+        void setImageRequestHandler(ImageRequestHandler* handler) { _imageRequestHandler = handler; }
+        
+        /** Get the handler for image requests.*/
+        ImageRequestHandler* getImageRequestHandler() { return _imageRequestHandler.get(); }
+
+        /** Get the const handler for image requests.*/
+        const ImageRequestHandler* getImageRequestHandler() const { return _imageRequestHandler.get(); }
+
+
 
     protected:
 
@@ -301,6 +325,7 @@ class OSG_EXPORT NodeVisitor : public virtual Referenced
         ref_ptr<Referenced>             _userData;
 
         ref_ptr<DatabaseRequestHandler> _databaseRequestHandler;
+        ref_ptr<ImageRequestHandler>    _imageRequestHandler;
 
 };