RVirtualCanvasPainter.hxx

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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.             *
 *************************************************************************/
 
#ifndef ROOT7_RVirtualCanvasPainter
#define ROOT7_RVirtualCanvasPainter
 
#include <memory>
#include <functional>
#include <string>
 
namespace ROOT {
namespace Experimental {
 
using CanvasCallback_t = std::function<void(bool)>;
 
class RCanvas;
class RWebWindow;
 
namespace Internal {
 
/** \class ROOT::Experimental::Internal::RVirtualCanvasPainter
\ingroup GpadROOT7
\brief Abstract interface for painting a canvas.
\author Axel Naumann <axel@cern.ch>
\date 2017-05-31
\warning This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!
*/
 
class RVirtualCanvasPainter {
protected:
   class Generator {
   public:
      /// Abstract interface to create a RVirtualCanvasPainter implementation.
      virtual std::unique_ptr<RVirtualCanvasPainter> Create(const RCanvas &canv) const = 0;
      /// Default destructor.
      virtual ~Generator();
   };
 
   /// generator getter
   static std::unique_ptr<Generator> &GetGenerator();
 
public:
   /// Default destructor.
   virtual ~RVirtualCanvasPainter();
 
   /// indicate that canvas changed, provides current version of the canvas
   virtual void CanvasUpdated(uint64_t, bool, CanvasCallback_t) = 0;
 
   /// return true if canvas modified since last painting
   virtual bool IsCanvasModified(uint64_t) const = 0;
 
   /// perform special action when drawing is ready
   virtual void DoWhenReady(const std::string &, const std::string &, bool, CanvasCallback_t) = 0;
 
   virtual void NewDisplay(const std::string &where) = 0;
 
   virtual int NumDisplays() const = 0;
 
   virtual std::string GetWindowAddr() const = 0;
 
   /// run canvas functionality in caller thread, not needed when main thread is used
   virtual void Run(double tm = 0.) = 0;
 
   virtual bool AddPanel(std::shared_ptr<RWebWindow>) { return false; }
 
   /// Loads the plugin that implements this class.
   static std::unique_ptr<RVirtualCanvasPainter> Create(const RCanvas &canv);
};
} // namespace Internal
} // namespace Experimental
} // namespace ROOT
 
#endif // ROOT7_RVirtualCanvasPainter