display-evaluation.cpp

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/*
  DisplayEvaluation  -  recursive interwoven timeline layout allocation
 
   Copyright (C)
     2020,            Hermann Vosseler <Ichthyostega@web.de>
 
 **Lumiera** 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. See the file COPYING for further details.
 
* *****************************************************************/
 
 
#include "stage/gtk-base.hpp"
#include "stage/timeline/display-evaluation.hpp"
 
#include "lib/util.hpp"
 
using util::isnil;
 
 
namespace stage {
namespace timeline {
  
  
  
  
  LayoutElement::~LayoutElement() { }   // emit VTables here....
  
  
  
  void
  DisplayEvaluation::perform()
  {
    this->reset();
    // Phase-1 : collect Layout information
    for (auto elm : elms_)
      elm->establishLayout (*this);
    // Phase-2 : reflow and balance the Layout
    collectLayout_ = false;
    for (auto elm : elms_)
      elm->completeLayout (*this);
  }
  
  void
  DisplayEvaluation::reset()
  {
    ASSERT (not isnil(elms_));
    collectLayout_ = true;
  }
 
  
  
  
  
}}// namespace stage::timeline