REveTableInfo.cxx

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// @(#)root/eve7:$Id$
// Authors: Matevz Tadel & Alja Mrak-Tadel: 2018

/*************************************************************************
 * Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
#include "TClass.h"
#include <ROOT/REveTableInfo.hxx>
#include <ROOT/REveManager.hxx>
#include "TROOT.h"
#include "TInterpreter.h"

#include "json.hpp"

using namespace ROOT::Experimental;

REveTableViewInfo::REveTableViewInfo(const std::string &name, const std::string &title) : REveElement(name, title), fConfigChanged(false)
{
}

void REveTableViewInfo::SetDisplayedCollection(ElementId_t collectionId)
{
   fDisplayedCollection = collectionId;

   fConfigChanged = true;
   for (auto &it : fDelegates)
      it();

   fConfigChanged = false;
   StampObjProps();
}

void REveTableViewInfo::AddNewColumnToCurrentCollection(const std::string& expr, const std::string& title, int prec)
{
   if (!fDisplayedCollection) return;

   REveDataCollection* col = dynamic_cast<REveDataCollection*>(gEve->FindElementById(fDisplayedCollection));
   if (!col) {
      printf("REveTableViewInfo::AddNewColumnToCurrentCollection error: collection not found\n");
      return;
   }

   const char *rtyp   = "void";
   auto icls = col->GetItemClass();
   std::function<void(void *)> fooptr;
   std::stringstream s;
   s << "*((std::function<" << rtyp << "(" << icls->GetName() << "*)>*)" << std::hex << std::showbase << (size_t)(&fooptr)
     << ") = [](" << icls->GetName() << "* p){" << icls->GetName() << " &i=*p; return (" << expr
     << "); }";

   int err;
   gROOT->ProcessLine(s.str().c_str(), &err);
   if (err != TInterpreter::kNoError)
   {
      std::cout << "REveTableViewInfo::AddNewColumnToCurrentCollection failed." <<  std::endl;
      return;
   }

   fConfigChanged = true;
   table(col->GetItemClass()->GetName()).column(title, prec, expr);

   for (auto &it : fDelegates)
      it();

   fConfigChanged = false;

   StampObjProps();
}

////////////////////////////////////////////////////////////////////////////////
/// Fill core part of JSON representation.

Int_t REveTableViewInfo::WriteCoreJson(nlohmann::json &j, Int_t rnr_offset)
{
   auto ret = REveElement::WriteCoreJson(j, rnr_offset);
   j["fDisplayedCollection"] = fDisplayedCollection;
   return ret;
}