display-evaluation.hpp

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/*
  DISPLAY-EVALUATION.hpp  -  recursive interwoven timeline layout allocation

  Copyright (C)         Lumiera.org
    2020,               Hermann Vosseler <Ichthyostega@web.de>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/


#ifndef STAGE_TIMELINE_DISPLAY_EVALUATION_H
#define STAGE_TIMELINE_DISPLAY_EVALUATION_H


#include "lib/error.hpp"
#include "lib/nocopy.hpp"
//#include "lib/util.hpp"

//#include <sigc++/signal.h>
#include <vector>



namespace stage  {
namespace timeline {
  
//using util::max;
  
//using model::ViewHooked;
//class TrackHeadWidget;
//class TrackBody;
  class DisplayEvaluation;
  
  
  class LayoutElement
    {
    public:
      virtual ~LayoutElement();        
      
      virtual void establishLayout (DisplayEvaluation&)  =0;
      virtual void completeLayout (DisplayEvaluation&)   =0;
    };
  
  
  class DisplayEvaluation
    : util::NonCopyable
    {
      std::vector<LayoutElement*> elms_;
      
      bool collectLayout_{true};
      
    public:
      void attach(LayoutElement& e) { elms_.push_back(&e); }
      void perform();
      
      bool isCollectPhase()  const  { return this->collectLayout_; }
      
    private:/* ===== Internals ===== */
      void reset();
    };
  
  
}}// namespace stage::timeline
#endif /*STAGE_TIMELINE_DISPLAY_EVALUATION_H*/