DtDatabasePagerCallback.h

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/*****************************************************************************
* Copyright (c) 2022 MAK Technologies, Inc.
* All rights reserved.
*****************************************************************************/


#pragma once

#include <osg/DatabaseRequestHandler>

#include <string>

namespace osg
{
   class PagedLOD;
   class Node;
   class Group;
}

namespace makVrv
{
   class DtDe;
   class DtTerrainPageSignaler;

   class DtDatabasePagerCallback : public osg::DatabaseRequestHandlerCallback
   {
   public:
      DtDatabasePagerCallback(DtDe& de);

      virtual ~DtDatabasePagerCallback();

      DtDatabasePagerCallback() = delete;
      DtDatabasePagerCallback(const DtDatabasePagerCallback& rhs) = delete;
      DtDatabasePagerCallback& operator=(const DtDatabasePagerCallback& rhs) = delete;
   public:
      virtual osg::DatabaseRequestHandlerCallback* clone() const override;

      virtual void childLoaded(const osg::DatabaseRequestHandler*, const osg::Group* page, osg::Node* child, const std::string& fileName, osg::Node*& returnedNode) const;

      /* child under parent was loaded and added to the scenegraph */
      virtual void childPagedIn(const osg::DatabaseRequestHandler*, osg::PagedLOD* page, osg::Node* child) const;

      /* child under parent was un-loaded and removed from the scenegraph */
      virtual void childAboutToPageOut(const osg::DatabaseRequestHandler*, osg::PagedLOD* page, osg::Node* child) const;
   
   protected:
      DtDe& myDe;
      DtTerrainPageSignaler& myTerrainPageSignaler;
   };
}