DtTerrainPageSignaler.h

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/******************************************************************************
** Copyright (c) 2018 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>
#include <vrvUtil/DtVirtualBaseClass.h>

#include <boost/signals.hpp>
#include <boost/signals2.hpp>

namespace osg
{
   class Node;
   class Group;
}

namespace makVrv
{
   class DT_DLL_VRVOSG DtTerrainPageSignaler : public DtVirtualBaseClass
   {
   public:

      //priorities 
      enum SignalSlotPriority
      {
         PRE_PROCESS_PRIORITY = 0
         , DEFAULT_PROCESS_PRIORITY = 1
         , POST_PROCESS_PRIORITY = 2
      };

      static DtTerrainPageSignaler& instance(DtDe&);
      static void registerInstance(DtDe& de, DtTerrainPageSignaler*);

      virtual ~DtTerrainPageSignaler();

      boost::signals2::signal<void(const osg::Group* page, const osg::Node* child, const std::string& fileName, osg::Node*& returnedNode)> signal_childLoaded;

      boost::signals2::signal<void(const osg::Group* page, const osg::Node* child)> signal_childPagedIn;

      boost::signals2::signal<void(const osg::Group* page, const osg::Node* child)> signal_childAboutToPageOut;

      virtual void setSignalsEnabled(bool enable);

      virtual bool signalsEnabled(void) const;

   protected:
      DtTerrainPageSignaler();

   protected:
      bool mySignalsEnabled;
   };
}