RStyle.hxx

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/*************************************************************************
 * 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.             *
 *************************************************************************/
 
#ifndef ROOT7_RStyle
#define ROOT7_RStyle
 
#include <ROOT/RAttrMap.hxx>
 
#include <string>
#include <list>
#include <memory>
 
namespace ROOT {
namespace Experimental {
 
class RDrawable;
 
/** \class RStyle
\ingroup GpadROOT7
\brief A set of defaults for graphics attributes, e.g. for histogram fill color, line width, frame offsets etc. Uses CSS syntax.
\author Axel Naumann <axel@cern.ch>
\author Sergey Linev <s.linev@gsi.de>
\date 2017-10-10
\warning This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!
*/
 
class RStyle {
 
public:
 
   struct Block_t {
      std::string selector;       ///<  css selector
      RAttrMap map;               ///<  container with attributes
      Block_t() = default;
      Block_t(const std::string &_selector) : selector(_selector) {}
 
      Block_t(const Block_t &src) : selector(src.selector), map(src.map) {} // not required
      Block_t& operator=(const Block_t &) = delete;
   };
 
   const RAttrMap::Value_t *Eval(const std::string &field, const RDrawable &drawable) const;
 
   const RAttrMap::Value_t *Eval(const std::string &field, const std::string &selector) const;
 
   RAttrMap &AddBlock(const std::string &selector)
   {
      fBlocks.emplace_back(selector);
      return fBlocks.back().map;
   }
 
   void Clear();
 
   static std::shared_ptr<RStyle> Parse(const std::string &css_code);
 
   bool ParseString(const std::string &css_code);
 
private:
 
   std::list<Block_t> fBlocks;  // use std::list to avoid calling of Block_t copy constructor
 
};
 
} // namespace Experimental
} // namespace ROOT
 
#endif // ROOT7_RStyle