dlp_mol.c

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/* This file is part of the 'atomes' software
 
'atomes' is free software: you can redistribute it and/or modify it under the terms
of the GNU Affero General Public License as published by the Free Software Foundation,
either version 3 of the License, or (at your option) any later version.
 
'atomes' 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 Affero General Public License along with 'atomes'.
If not, see <https://www.gnu.org/licenses/>
 
Copyright (C) 2022-2026 by CNRS and University of Strasbourg */

 
/*
* This file: 'dlp_mol.c'
*
* Contains:
*
 
 - The functions to add / remove molecule(s) to / from the force field
 
*
* List of functions:
 
  gchar * remove_text (int i, int j, gchar * str);
 
  void clean_up_molecules_info (gboolean usel);
  void set_sensitive_mol (GtkTreeViewColumn * col, GtkCellRenderer * renderer, GtkTreeModel * mod, GtkTreeIter * iter, gpointer data);
  void clear_field_atoms (field_molecule * fmol, field_atom* at, int mols, int * mol);
  void molecule_set_color (GtkTreeViewColumn * col, GtkCellRenderer * renderer, GtkTreeModel * mod, GtkTreeIter * iter, gpointer data);
  void merge_all_atoms_to_mol (field_molecule * new_mol, int mstart);
  void prepare_atoms_to_merge (field_atom* at, field_molecule * new_mol, field_molecule * old_mol);
 
  G_MODULE_EXPORT void select_mol (GtkCellRendererToggle * cell_renderer, gchar * string_path, gpointer data);
  G_MODULE_EXPORT void run_add_molecule_to_field (GtkDialog * dialog, gint response_id, gpointer data);
  G_MODULE_EXPORT void add_molecule_to_field (GSimpleAction * action, GVariant * parameter, gpointer data);
  G_MODULE_EXPORT void run_remove_molecule_from_field (GtkDialog * rmol, gint response_id, gpointer data);
  G_MODULE_EXPORT void remove_molecule_from_field (GSimpleAction * action, GVariant * parameter, gpointer data);
 
  field_atom* new_atom_to_merge (int id, field_molecule * fmol);
 
*/
 
#include "dlp_field.h"
#include "calc.h"
#include "interface.h"
#include "glview.h"
 
int active_col;
int a_mol, b_mol;
int * new_mol;
extern ColRGBA init_color (int id, int numid);
field_molecule * to_remove;
GtkWidget * remove_label;
GtkCellRenderer * remove_renderer[5];
GtkTreeViewColumn * remove_col[5];
gboolean removing = FALSE;
extern void field_unselect_all ();
extern gchar * set_field_atom_name (field_atom* ato, field_molecule * mol);
extern void find_atom_id_in_field_molecule (field_molecule * fmol);
extern void viz_fragment (field_molecule * fmol, int id, int viz);
extern void check_to_visualize_properties (int id);

gchar * remove_text (int i, int j, gchar * str)
{
  switch (i)
  {
    case -2:
      return g_strdup_printf (_("The description of atom <b>%s</b> will be deleted\n"
                                "and merged with the one of the selected field atom.\n"
                                "Field object(s) using atom <b>%s</b> will also be deleted\n"
                                "and the force field parameter(s) will be updated accordingly."),
                              str, str);
      break;
    case -1:
      return g_strdup_printf (_("The description of molecule <b>%s</b> will be deleted\nand merged with the one of the selected molecule."), str);
      break;
    default:
      switch (j)
      {
        case -1:
          return g_strdup_printf (_("The description of molecule <b>%s</b> will be deleted\nand merged with the one of molecule <b>%s</b>"), str, get_active_field_molecule(i) -> name);
          break;
        default:
          return g_strdup_printf (_("The description of atom <b>%s</b> will be deleted\n"
                                    "and merged with the one of field atom <b>%s</b>\n"
                                    "Field object(s) using atom <b>%s</b> will also be deleted\n"
                                    "and the force field parameter(s) will be updated accordingly."),
                                  str, get_active_atom(i,j) -> name, str);
          break;
      }
      break;
  }
}

void clean_up_molecules_info (gboolean usel)
{
  int i;
 
  for (i=0; i<MOLIMIT-1; i++)
  {
    combo_mol[i] = destroy_this_widget (combo_mol[i]);
    combo_mol[i] = create_combo_mol (i);
    add_box_child_start (GTK_ORIENTATION_HORIZONTAL, mol_box[i], combo_mol[i], FALSE, FALSE, 10);
    show_the_widgets (combo_mol[i]);
    changed_mol_box (GTK_COMBO_BOX(combo_mol[i]), GINT_TO_POINTER(i+1));
  }
  set_mol_num_label ();
  if (usel) field_unselect_all ();
  gtk_tree_store_clear (field_model[0]);
  fill_field_model (field_model[0], 0, -1);
}

void set_sensitive_mol (GtkTreeViewColumn * col, GtkCellRenderer * renderer, GtkTreeModel * mod, GtkTreeIter * iter, gpointer data)
{
  int m;
  gtk_tree_model_get (mod, iter, 0, & m, -1);
  if (a_mol && m-1 != new_mol[0])
  {
    gtk_cell_renderer_set_visible (renderer, FALSE);
  }
  else
  {
    gtk_cell_renderer_set_visible (renderer, TRUE);
  }
}
 
int old_viz_mol;

G_MODULE_EXPORT void select_mol (GtkCellRendererToggle * cell_renderer, gchar * string_path, gpointer data)
{
  GtkTreeStore ** model = (GtkTreeStore **)data;
  GtkTreeIter iter;
  GtkTreePath * path = gtk_tree_path_new_from_string (string_path);
  gtk_tree_model_get_iter (GTK_TREE_MODEL(* model), & iter, path);
  if (gtk_cell_renderer_toggle_get_active(cell_renderer))
  {
    new_mol[a_mol-1] = -1;
    a_mol --;
    gtk_tree_store_set (* model, & iter, active_col, 0, -1);
    toviz.c = 0;
  }
  else
  {
    a_mol ++;
    gtk_tree_store_set (* model, & iter, active_col, 1, -1);
    gtk_tree_model_get (GTK_TREE_MODEL(* model), & iter, 0, & new_mol[a_mol-1], -1);
    new_mol[a_mol-1] --;
    toviz.c = 1;
  }
  if (active_col == 1)
  {
    toviz.a = 2;
    gtk_tree_model_get (GTK_TREE_MODEL(* model), & iter, 0, & toviz.b, -1);
    viz_fragment (tmp_fmol, toviz.b-1, toviz.c);
  }
  else if (active_col == 3)
  {
    if (toviz.c) old_viz_mol = new_mol[0];
    visualize_object (0, old_viz_mol, -1);
    check_to_visualize_properties (0);
    gtk_label_set_text (GTK_LABEL(remove_label), remove_text(new_mol[0], -1, to_remove -> name));
    gtk_label_set_use_markup (GTK_LABEL(remove_label), TRUE);
  }
}
 
dint ** atomd_id_save;

void clear_field_atoms (field_molecule * fmol, field_atom* at, int mols, int * mol)
{
  int i, j, k, l;
  l = 0;
  for (i=0; i < at -> num; i++)
  {
    k = at -> list[i];
    for (j=0; j < mols; j++)
    {
      if (tmp_proj -> atoms[0][k].coord[2] == mol[j])
      {
        l ++;
      }
    }
  }
  int * r_list = allocint (l);
  int * s_list = allocint (l);
  int * t_list = allocint (l);
  l = -1;
  at -> frozen = 0;
  for (i=0; i < at -> num; i++)
  {
    k = at -> list[i];
    for (j=0; j < mols; j++)
    {
      if (tmp_proj -> atoms[0][k].coord[2] == mol[j])
      {
        l ++;
        r_list[l] = k;
        s_list[l] = at -> list_id[i];
        t_list[l] = at -> frozen_id[i];
        if (t_list[l]) at -> frozen ++;
      }
    }
  }
  at -> num = l+1;
  at -> list = NULL;
  at -> list = allocint (at -> num);
  at -> list_id = NULL;
  at -> list_id = allocint (at -> num);
  at -> frozen_id = NULL;
  at -> frozen_id = allocbool (at -> num);
  for (i=0; i < at -> num; i++)
  {
    at -> list[i] = r_list[i];
    at -> list_id[i] = s_list[i];
    at -> frozen_id[i] = t_list[i];
    j = at -> list[i];
    k = at -> list_id[i];
    for (l=0; l<mols; l++)
    {
      if (tmp_proj -> atoms[0][j].coord[2] == mol[l])
      {
        atomd_id_save[k][l].a = at -> id;
        atomd_id_save[k][l].b = i;
      }
    }
  }
  g_free (r_list);
  g_free (s_list);
  g_free (t_list);
}

void molecule_set_color (GtkTreeViewColumn * col, GtkCellRenderer * renderer, GtkTreeModel * mod, GtkTreeIter * iter, gpointer data)
{
  int i, j;
  gtk_tree_model_get (mod, iter, active_col, & j, -1);
  gtk_tree_model_get (mod, iter, 0, & i, -1);
  set_renderer_color (j, renderer, init_color (i-1, num_field_objects));
}

G_MODULE_EXPORT void run_add_molecule_to_field (GtkDialog * dialog, gint response_id, gpointer data)
{
  int i, j, k;
  int * old_mol = NULL;
  gchar * str;
  gboolean done = FALSE;
  gboolean saveit = FALSE;
  // Id - Name - Multiplicity - Select
  // While selected < m apply inactif
  switch (response_id)
  {
    case GTK_RESPONSE_APPLY:
      if (a_mol > 0 && a_mol < tmp_fmol -> multi)
      {
        if (a_mol > 1)
        {
          str = g_strdup_printf (_("Fragments N°%d"), new_mol[0]+1);
          if (a_mol > 2)
          {
            for (i=1; i<a_mol-1; i++)
            {
              str = g_strdup_printf ("%s, %d", str, new_mol[i]+1);
            }
          }
          str = g_strdup_printf (_("%s and %d have been selected !"), str, new_mol[a_mol-1]+1);
          str = g_strdup_printf (_("%s\nConfirm this choice and create a new field molecule to describe these fragments ?"), str);
        }
        else
        {
          str = g_strdup_printf (_("Fragment N°%d has been selected !"), new_mol[0]+1);
          str = g_strdup_printf (_("%s\nConfirm this choice and create a new field molecule to describe this fragment ?"), str);
        }
        selection_confirmed = FALSE;
        field_question (str, G_CALLBACK(confirm_selection), NULL);
        g_free (str);
        if (selection_confirmed)
        {
          done = TRUE;
          field_molecule * old_fmol = get_active_field_molecule(row_id);
          field_molecule * next_fmol = duplicate_field_molecule (old_fmol);
          get_active_field_molecule(tmp_field -> molecules-1) -> next = next_fmol;
          next_fmol -> prev = get_active_field_molecule(tmp_field -> molecules-1);
          next_fmol -> id = tmp_field -> molecules;
          next_fmol -> multi = a_mol;
          next_fmol -> fragments = NULL;
          next_fmol -> fragments = allocint (a_mol);
          for (i=0; i<a_mol; i++) next_fmol -> fragments[i] = new_mol[i];
          // Atoms_id and field atoms
          atomd_id_save = g_malloc0(next_fmol-> mol -> natoms*sizeof*atomd_id_save);
          for (i=0; i<next_fmol-> mol -> natoms; i++)
          {
            atomd_id_save[i] = g_malloc0(next_fmol -> multi*sizeof*atomd_id_save[i]);
          }
          tmp_fat = next_fmol -> first_atom;
          for (i=0; i < next_fmol -> atoms; i++)
          {
            clear_field_atoms (next_fmol, tmp_fat, a_mol, new_mol);
            tmp_fat -> name = g_strdup_printf ("%s", set_field_atom_name (tmp_fat, next_fmol));
            if (tmp_fat -> next != NULL) tmp_fat = tmp_fat -> next;
          }
          g_free (next_fmol -> atoms_id);
          next_fmol -> atoms_id = NULL;
          next_fmol -> atoms_id = g_malloc0(next_fmol-> mol -> natoms*sizeof*next_fmol -> atoms_id);
          for (i=0; i<next_fmol-> mol -> natoms; i++)
          {
            next_fmol -> atoms_id[i] = g_malloc0(next_fmol -> multi*sizeof*next_fmol -> atoms_id[i]);
            for (j=0; j<next_fmol -> multi; j++)
            {
              next_fmol -> atoms_id[i][j].a = atomd_id_save[i][j].a;
              next_fmol -> atoms_id[i][j].b = atomd_id_save[i][j].b;
            }
          }
          g_free (atomd_id_save);
          old_mol = allocint (old_fmol -> multi - a_mol);
          k = -1;
          for (i=0; i<old_fmol -> multi; i++)
          {
            saveit = TRUE;
            for (j=0; j<a_mol; j++)
            {
              if (new_mol[j] == old_fmol -> fragments[i])
              {
                saveit = FALSE;
                break;
              }
            }
            if (saveit)
            {
              k++;
              old_mol[k] = old_fmol -> fragments[i];
            }
          }
          new_mol = NULL;
          // Now we deal with atoms_id and the field atoms
          atomd_id_save = g_malloc0(old_fmol-> mol -> natoms*sizeof*atomd_id_save);
          for (i=0; i<old_fmol -> mol -> natoms; i++)
          {
            atomd_id_save[i] = g_malloc0((old_fmol -> multi - a_mol)*sizeof*atomd_id_save[i]);
          }
          tmp_fat = old_fmol -> first_atom;
          for (i=0; i < old_fmol -> atoms; i++)
          {
            clear_field_atoms (old_fmol, tmp_fat, old_fmol -> multi - a_mol, old_mol);
            if (tmp_fat -> next != NULL) tmp_fat = tmp_fat -> next;
          }
          old_fmol -> multi -= a_mol;
          g_free (old_fmol -> atoms_id);
          old_fmol -> atoms_id = NULL;
          old_fmol -> atoms_id = g_malloc0(old_fmol-> mol -> natoms*sizeof*old_fmol -> atoms_id);
          for (i=0; i<old_fmol-> mol -> natoms; i++)
          {
            old_fmol -> atoms_id[i] = g_malloc0(old_fmol -> multi*sizeof*old_fmol -> atoms_id[i]);
            for (j=0; j<old_fmol -> multi; j++)
            {
              old_fmol -> atoms_id[i][j].a = atomd_id_save[i][j].a;
              old_fmol -> atoms_id[i][j].b = atomd_id_save[i][j].b;
            }
          }
          g_free (atomd_id_save);
          old_fmol -> fragments = NULL;
          old_fmol -> fragments = allocint (old_fmol -> multi);
          for (i=0; i<old_fmol -> multi; i++) old_fmol -> fragments[i] = old_mol[i];
          old_mol = NULL;
          row_id = tmp_field -> molecules;
          tmp_field -> molecules ++;
          edit_field_prop (NULL, NULL, GINT_TO_POINTER(0));
          clean_up_molecules_info (TRUE);
        }
      }
      break;
    default:
      field_unselect_all ();
      done = TRUE;
      break;
  }
  if (done)
  {
    g_free (new_mol);
    new_mol = NULL;
    destroy_this_dialog (dialog);
  }
}

G_MODULE_EXPORT void add_molecule_to_field (GSimpleAction * action, GVariant * parameter, gpointer data)
{
  int i;
  field_object = 0;
  gchar * str = g_strdup_printf (_("Please select the fragment(s) of the new molecule"));
  GtkWidget * amol = dialogmodal (str, GTK_WINDOW(field_assistant));
  g_free (str);
  gtk_dialog_add_button (GTK_DIALOG(amol), _("Apply"), GTK_RESPONSE_APPLY);
  GtkWidget * add_tree =  NULL;
  GtkTreeIter iter;
  GtkTreeViewColumn * mol_col[2];
  GtkCellRenderer * mol_cell[2];
  gchar * mol_title[2] = {i18n("Fragment"), i18n("Viz.3D & Select")};
  gchar * ctype[2]={"text", "active"};
  GType col_type[2] = {G_TYPE_INT, G_TYPE_BOOLEAN};
 
  active_col = 1;
  a_mol = 0;
  GtkTreeStore * add_model = gtk_tree_store_newv (2, col_type);
  add_tree = gtk_tree_view_new_with_model(GTK_TREE_MODEL(add_model));
  tmp_fmol = get_active_field_molecule (row_id);
  for (i=0; i<2; i++)
  {
    if (i == 0)
    {
      mol_cell[i] = gtk_cell_renderer_text_new ();
    }
    else
    {
      mol_cell[i] = gtk_cell_renderer_toggle_new ();
      g_signal_connect (G_OBJECT(mol_cell[i]), "toggled", G_CALLBACK(select_mol), & add_model);
    }
    mol_col[i] = gtk_tree_view_column_new_with_attributes (_(mol_title[i]), mol_cell[i], ctype[i], i, NULL);
    gtk_tree_view_append_column (GTK_TREE_VIEW(add_tree), mol_col[i]);
    gtk_tree_view_column_set_alignment (mol_col[i], 0.5);
    if (i == 0)
    {
      gtk_tree_view_column_set_cell_data_func (mol_col[i], mol_cell[i], molecule_set_color, NULL, NULL);
    }
  }
  // fill model
  num_field_objects = tmp_coord-> totcoord[2];
  new_mol = NULL;
  new_mol = allocint (tmp_fmol -> multi);
  for (i=0; i<tmp_fmol -> multi; i++)
  {
    gtk_tree_store_append (add_model, & iter, NULL);
    gtk_tree_store_set (add_model, & iter, 0, tmp_fmol -> fragments[i] + 1, 1, 0, -1);
    new_mol[i] = -1;
  }
  g_object_unref (add_model);
  gtk_tree_view_expand_all (GTK_TREE_VIEW(add_tree));
 
  i = ((tmp_fmol -> multi+1)*35 < 500) ? (tmp_fmol -> multi+1)*35 : 500;
  GtkWidget * scrollsets = create_scroll (dialog_get_content_area (amol), 220, i, GTK_SHADOW_ETCHED_IN);
  add_container_child (CONTAINER_SCR, scrollsets, add_tree);
  run_this_gtk_dialog (amol, G_CALLBACK(run_add_molecule_to_field), NULL);
}

void merge_all_atoms_to_mol (field_molecule * new_mol, int mstart)
{
  field_atom* fat, * fbt;
  fat = get_active_atom (new_mol -> id, new_mol -> atoms-1);
  int i, j, k, l, m, n;
  for (i=0; i<fat -> num; i++)
  {
    j = fat -> list[i];
    k = fat -> list_id[i];
    l = new_mol -> atoms_id[k][0].a;
    fbt = get_active_atom (new_mol -> id, l);
    fbt -> list[fbt -> num] = j;
    fbt -> list_id[fbt -> num] = k;
    m = tmp_proj -> atoms[0][j].coord[2];
    for (n=mstart; n<new_mol -> multi; n++)
    {
      if (new_mol -> fragments[n] == m)
      {
        new_mol -> atoms_id[k][n].a = fbt -> id;
        new_mol -> atoms_id[k][n].b = fbt -> num;
        break;
      }
    }
    fbt -> num ++;
  }
}

void prepare_atoms_to_merge (field_atom* at, field_molecule * new_mol, field_molecule * old_mol)
{
  int i, j;
  int * saved_list = allocint (at -> num);
  int * saved_list_id = allocint (at -> num);
  int * saved_frozen_id = allocbool (at -> num);
  for (j=0; j < at -> num; j++)
  {
    saved_list[j] = at -> list[j];
    saved_list_id[j] = at -> list_id[j];
    saved_frozen_id[j] = at -> frozen_id[j];
  }
  i = at -> num;
  i /= (new_mol -> multi - old_mol -> multi);
  i *= old_mol -> multi;
  g_free (at -> list);
  at -> list = allocint (at -> num + i);
  g_free (at -> list_id);
  at -> list_id = allocint (at -> num + i);
  g_free (at -> frozen_id);
  at -> frozen_id = allocbool (at -> num + i);
  for (j=0; j< at -> num; j++)
  {
    at -> list[j] = saved_list[j];
    at -> list_id[j] = saved_list_id[j];
    at -> frozen_id[j] = saved_frozen_id[j];
  }
  g_free (saved_list);
  g_free (saved_list_id);
  g_free (saved_frozen_id);
}

field_atom* new_atom_to_merge (int id, field_molecule * fmol)
{
  field_atom* fat, * fbt;
  fat = g_malloc0(sizeof*fat);
  fat -> id = id;
  fat -> sp = -1;
  fat -> num = fmol -> mol -> natoms * fmol -> multi;
  fat -> list = allocint (fmol -> mol -> natoms * fmol -> multi);
  fat -> list_id = allocint (fmol -> mol -> natoms * fmol -> multi);
  fbt = fmol -> first_atom;
  int i, j;
  i = 0;
  while (fbt != NULL)
  {
    for (j=0; j<fbt -> num; j++)
    {
      fat -> list[i] = fbt -> list[j];
      fat -> list_id[i] = fbt -> list_id[j];
      i ++;
    }
    fbt = fbt -> next;
  }
  return fat;
}

G_MODULE_EXPORT void run_remove_molecule_from_field (GtkDialog * rmol, gint response_id, gpointer data)
{
  int i, j;
  gboolean done = FALSE;
  switch (response_id)
  {
    case GTK_RESPONSE_APPLY:
      if (a_mol)
      {
        done = TRUE;
        field_molecule * to_merge = get_active_field_molecule(new_mol[0]);
        int * old_mol = allocint (to_merge -> multi);
        for (i=0; i<to_merge -> multi; i++) old_mol[i] = to_merge -> fragments[i];
        g_free (to_merge -> fragments);
        to_merge -> fragments = allocint (to_merge -> multi + to_remove -> multi);
        for (i=0; i<to_merge -> multi; i++) to_merge -> fragments[i] = old_mol[i];
        old_mol = NULL;
        for (i=to_merge -> multi; i < to_merge -> multi + to_remove -> multi; i++)
        {
          to_merge -> fragments[i] = to_remove -> fragments[i - to_merge -> multi];
        }
        atomd_id_save = g_malloc0(to_merge -> mol -> natoms*sizeof*atomd_id_save);
        for (i=0; i<to_merge -> mol -> natoms; i++)
        {
          atomd_id_save[i] = g_malloc0((to_merge -> multi+to_remove -> multi)*sizeof*atomd_id_save[i]);
          for (j=0; j<to_merge -> multi; j++)
          {
            atomd_id_save[i][j].a = to_merge -> atoms_id[i][j].a;
            atomd_id_save[i][j].b = to_merge -> atoms_id[i][j].b;
          }
          for (j=to_merge -> multi; j<to_merge -> multi+to_remove -> multi; j++)
          {
            atomd_id_save[i][j].a = -1;
            atomd_id_save[i][j].b = -1;
          }
        }
        to_merge -> multi += to_remove -> multi;
        g_free (to_merge -> atoms_id);
        to_merge -> atoms_id = g_malloc0(to_merge -> mol -> natoms*sizeof*to_merge -> atoms_id);
        for (i=0; i<to_merge -> mol -> natoms; i++)
        {
          to_merge -> atoms_id[i] = g_malloc0(to_merge -> multi*sizeof*to_merge -> atoms_id[i]);
          for (j=0; j<to_merge -> multi; j++)
          {
            to_merge -> atoms_id[i][j].a = atomd_id_save[i][j].a;
            to_merge -> atoms_id[i][j].b = atomd_id_save[i][j].b;
          }
        }
        g_free (atomd_id_save);
        tmp_fat = get_active_atom (to_merge -> id, to_merge -> atoms -1);
        tmp_fat -> next = new_atom_to_merge (to_merge -> atoms, to_remove);
        to_merge -> atoms ++;
        tmp_fat = to_merge -> first_atom;
        for (i=0; i < to_merge -> atoms-1; i++)
        {
          prepare_atoms_to_merge (tmp_fat, to_merge, to_remove);
          if (tmp_fat -> next != NULL) tmp_fat = tmp_fat -> next;
        }
        merge_all_atoms_to_mol (to_merge, to_merge -> multi - to_remove -> multi);
        tmp_fat = get_active_atom (to_merge -> id, to_merge -> atoms-2);
        g_free (tmp_fat -> next);
        tmp_fat -> next = NULL;
        to_merge -> atoms --;
 
        if (to_remove == tmp_field -> first_molecule)
        {
          tmp_field -> first_molecule = to_remove -> next;
          tmp_field -> first_molecule -> prev = NULL;
        }
        else
        {
          if (to_remove -> next != NULL)
          {
            tmp_fmol = to_remove -> prev;
            tmp_fmol -> next = to_remove -> next;
            to_remove -> next -> prev = tmp_fmol;
          }
          else
          {
            to_remove = to_remove -> prev;
            to_remove -> next = NULL;
          }
        }
 
        tmp_field -> molecules --;
        clean_up_molecules_info (TRUE);
      }
      break;
    default:
      field_unselect_all ();
      done = TRUE;
      break;
  }
  if (done) destroy_this_dialog (rmol);
}

G_MODULE_EXPORT void remove_molecule_from_field (GSimpleAction * action, GVariant * parameter, gpointer data)
{
  to_remove = (field_molecule *) data;
  int i, j;
  field_object = 0;
  gchar * str = g_strdup_printf (_("Select the molecule to merge molecule \"%s\" with"), to_remove -> name);
  GtkWidget * rmol = dialogmodal (str, GTK_WINDOW(field_assistant));
  g_free (str);
  gtk_dialog_add_button (GTK_DIALOG(rmol), _("Apply"), GTK_RESPONSE_APPLY);
 
  GtkWidget * remove_tree =  NULL;
  GtkTreeIter iter;
 
  gchar * mol_title[4] = {i18n("Id."), i18n("Name"), i18n("Multiplicity"), i18n("Viz.3D & Merge with")};
  gchar * ctype[4]={"text", "text", "text", "active"};
  GType col_type[4] = {G_TYPE_INT, G_TYPE_STRING, G_TYPE_INT, G_TYPE_BOOLEAN};
 
  active_col = 3;
  a_mol = 0;
  new_mol = allocint (1);
  GtkTreeStore * remove_model = gtk_tree_store_newv (4, col_type);
  remove_tree = gtk_tree_view_new_with_model(GTK_TREE_MODEL(remove_model));
  for (i=0; i<4; i++)
  {
    if (i < 3)
    {
      remove_renderer[i] = gtk_cell_renderer_text_new ();
    }
    else
    {
      remove_renderer[i] = gtk_cell_renderer_toggle_new ();
      gtk_cell_renderer_toggle_set_radio (GTK_CELL_RENDERER_TOGGLE(remove_renderer[i]), TRUE);
      g_signal_connect (G_OBJECT(remove_renderer[i]), "toggled", G_CALLBACK(select_mol), & remove_model);
    }
    remove_col[i] = gtk_tree_view_column_new_with_attributes (_(mol_title[i]), remove_renderer[i], ctype[i], i, NULL);
    gtk_tree_view_append_column (GTK_TREE_VIEW(remove_tree), remove_col[i]);
    if (i < 3)
    {
      gtk_tree_view_column_set_cell_data_func (remove_col[i], remove_renderer[i], molecule_set_color, NULL, NULL);
    }
    else
    {
      gtk_tree_view_column_set_cell_data_func (remove_col[i], remove_renderer[i], set_sensitive_mol, NULL, NULL);
    }
  }
  // fill model
  tmp_fmol = tmp_field -> first_molecule;
  j = 0;
  for (i=0; i<tmp_field -> molecules; i++)
  {
    if (tmp_fmol != to_remove && tmp_fmol -> mol -> id == to_remove -> mol -> id)
    {
      j ++;
      gtk_tree_store_append (remove_model, & iter, NULL);
      gtk_tree_store_set (remove_model, & iter, 0, i+1,
                                                1, tmp_fmol -> name,
                                                2, tmp_fmol -> multi,
                                                3, 0, -1);
    }
    if (tmp_fmol -> next != NULL) tmp_fmol = tmp_fmol -> next;
  }
  num_field_objects = tmp_field -> molecules;
  g_object_unref (remove_model);
  gtk_tree_view_expand_all (GTK_TREE_VIEW(remove_tree));
 
  i = ((j+1)*40 < 500) ? (j+1)*40 : 500;
  GtkWidget * scrollsets = create_scroll (dialog_get_content_area (rmol), 375, i, GTK_SHADOW_ETCHED_IN);
  add_container_child (CONTAINER_SCR, scrollsets, remove_tree);
  remove_label = gtk_label_new (remove_text(-1, -1, to_remove -> name));
  gtk_label_set_use_markup (GTK_LABEL(remove_label), TRUE);
  add_box_child_start (GTK_ORIENTATION_VERTICAL, dialog_get_content_area (rmol), remove_label, FALSE, FALSE, 0);
  run_this_gtk_dialog (rmol, G_CALLBACK(run_remove_molecule_from_field), NULL);
}