CbmQaCanvas.h

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/* Copyright (C) 2020 GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
   SPDX-License-Identifier: GPL-3.0-only
   Authors: Sergey Gorbunov [committer] */
 
 
#ifndef CbmQaCanvas_H
#define CbmQaCanvas_H
 
#include "TCanvas.h"
#include "TROOT.h"
 
class CbmQaCanvas : public TCanvas {
 public:
  CbmQaCanvas() : TCanvas() {}
 
  template<typename... Types>
  CbmQaCanvas(Types... args) : CbmQaCanvas(SetBatchModeOn(), args...)
  {
  }
 
  virtual ~CbmQaCanvas() {}
 
  void Divide2D(int nPads);
 
 
  static CbmQaCanvas& GetDummyCanvas()
  {
    static CbmQaCanvas dummy("CbmQaDummyCanvas", "CbmQaDummyCanvas", 5, 5);
    return dummy;
  }
 
 
 private:
  enum MyBoolean : Bool_t;
 
  template<typename... Types>
  CbmQaCanvas(MyBoolean oldBatchMode, Types... args) : TCanvas(args...)
  {
    // prevent automatic deletion of this canvas
    // when another canvas with the same name is created somewhere else
    gROOT->GetListOfCanvases()->Remove(this);
    // reset the batch mode to its original value
    gROOT->SetBatch((Bool_t) oldBatchMode);
  }
 
  static MyBoolean SetBatchModeOn()
  {
    MyBoolean oldBatchMode = (MyBoolean) gROOT->IsBatch();
    gROOT->SetBatch(kTRUE);
    return oldBatchMode;
  }
 
  ClassDef(CbmQaCanvas, 1);
};
 
#endif