RDisplayItem.cxx

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/*************************************************************************
 * Copyright (C) 1995-2017, 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 "ROOT/RDisplayItem.hxx"
 
#include "ROOT/RDrawable.hxx"
 
#include "TString.h"
 
using namespace ROOT::Experimental;
 
////////////////////////////////////////////////////////////////////////////
/// Assign id using arbitrary pointer value
/// Typically drawable pointer should be used here
 
void RDisplayItem::SetObjectIDAsPtr(const void *ptr)
{
   SetObjectID(ObjectIDFromPtr(ptr));
}
 
////////////////////////////////////////////////////////////////////////////
/// Build full id, including prefix and object index
 
void RDisplayItem::BuildFullId(const std::string &prefix)
{
   SetObjectID(prefix + std::to_string(GetIndex()) + "_" + GetObjectID());
}
 
////////////////////////////////////////////////////////////////////////////
/// Construct fillid using pointer value
 
std::string RDisplayItem::ObjectIDFromPtr(const void *ptr)
{
   auto hash = TString::Hash(&ptr, sizeof(ptr));
   return std::to_string(hash);
}
 
///////////////////////////////////////////////////////////
/// destructor
 
RDrawableDisplayItem::~RDrawableDisplayItem()
{
   if (fDrawable)
      fDrawable->OnDisplayItemDestroyed(this);
}
 
///////////////////////////////////////////////////////////
/// Constructor
 
RIndirectDisplayItem::RIndirectDisplayItem(const RDrawable &dr)
{
   fAttr = &dr.fAttr;
   fCssClass = &dr.fCssClass;
   fId = &dr.fId;
}