//*-- Author :    Damir Buskulic   22/04/03

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// VVirtualFrameChannelViewer                                           //
//                                                                      //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include "TROOT.h"
#include "TPluginManager.h"
#include "VVirtualFrameChannelViewer.h"

TClass  *VVirtualFrameChannelViewer::mgViewer = 0;
VVirtualFrameChannelViewer* gDataViewer;

ClassImp(VVirtualFrameChannelViewer)

//______________________________________________________________________________
VVirtualFrameChannelViewer::VVirtualFrameChannelViewer() : TObject()
{
//
// Frame channel viewer constructor
//
   gDataViewer = this;
}

//______________________________________________________________________________
  VVirtualFrameChannelViewer *VVirtualFrameChannelViewer::FrameChannelViewer(VVirtualFrameChannel *obj)
{
   // Static function returning a pointer to a frame channel viewer.
   // The viewer will process the specified obj. If the frame channel viewer
   // does not exist a default viewer is created.

   // if no viewer set yet,  create a default viewer via the PluginManager
   if (!mgViewer) {
      TPluginHandler *h;
      //if ((h = GetPluginManager()->FindHandler("TVirtualProof")))
      //   h->LoadPlugin();
      if ((h = gROOT->GetPluginManager()->FindHandler("VVirtualFrameChannelViewer"))) {
         if (h->LoadPlugin() == -1) {
            return 0;}
         VVirtualFrameChannelViewer::SetViewer(h->GetClass());
         if (!mgViewer) return 0;
      } else return 0;
   }
   //create an instance of the Tree viewer
   VVirtualFrameChannelViewer *p = (VVirtualFrameChannelViewer*)mgViewer->New();
   if (p) {
      p->SetFrameChannel(obj);
      gDataViewer = p;
   }
   return p;
}

//______________________________________________________________________________
  void VVirtualFrameChannelViewer::SetViewer(const char *viewer)
{
   // Static function to set an alternative frame channel viewer.

   mgViewer = gROOT->GetClass(viewer);
}

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