easel_manager.C

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/*!
 *  \file easel_manager.C
 *  \brief Contains the implementation of the EaselManager class.
 *
 *  \sa easel_manager.H
 *
 */

#include "geom/world.H"
#include "gest/vieweasel.H"

#include "easel_manager.H"

void
EaselManager::make_new_easel(const VIEWptr &v)
{
   
   if(!cur_easel()){
      
      VIEW_EASELptr easel = new VIEW_EASEL(v);
      
      assert(easel);

      cur_easel_idx = easel_list.num();
      easel_list += easel;

      WORLD::message("Created new easel");
      
   }
   
}

void
EaselManager::undisplay_cur_easel()
{
   
   if(cur_easel())
      cur_easel()->removeEasel();
   
   cur_easel_idx = -1;
   
}

void
EaselManager::next_easel()
{
   
   if(num_easels() == 0)
      return;

   if(cur_easel())
      cur_easel()->removeEasel();
   
   // Is this a no-op?
   cur_easel() = NULL;

   // Gently find and set aside the easel
   // that will be the new one:
   long k = 0;                                  // index of new one
   if(cur_easel())
      k = (cur_easel_idx + 1) % num_easels();
   
   VIEW_EASELptr cur = easel(k);                // new one
   
   // Make sure next easel exists and was fetched properly:
   assert(cur);

   // Now pretend there is no current easel:
   cur_easel_idx = -1;

   // ... and tell the new one to take charge:
   cur->restoreEasel();

   // Whew! That generated camera callbacks, triggering
   // Draw_int::notify(), which tried to deactivate the current
   // easel. But there is no "current easel," get it?? (wink, wink).

   // Enough of the charade. Back to business:
   cur_easel_idx = k;

}
      
void
EaselManager::clear_easels()
{
   
   easel_list.clear();
   cur_easel_idx = -1;

   WORLD::message("cleared easels");
   
}

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