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 * $Id: slide_move_down.c 1300 2008-04-18 17:18:30Z vapour $
 * Salasaga: Function called when the user selects Slide -> Move down from the top menu 
 * Copyright (C) 2005-2008 Justin Clift <justin@salasaga.org>
 * This file is part of Salasaga.
 * Salasaga is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 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
 * GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/>.

// GTK includes
#include <gtk/gtk.h>

#ifdef _WIN32
      // Windows only code
      #include <windows.h>

// Salasaga includes
#include "../salasaga_types.h"
#include "../externs.h"

void slide_move_down(void)
      // Local variables
      GtkTreeIter             from_iter, to_iter;
      GtkTreePath             *new_path;                          // Temporary path
      GList                   *next_slide;                        // Pointer to the slide below
      gint                    num_slides;                         // The total number of slides
      GtkTreePath             *old_path = NULL;             // The old path, which we'll free
      gint                    slide_position;                     // Which slide in the slide list we are moving
      slide                   *this_slide_data;             // Pointer to the data for this slide
      GString                       *tmp_gstring;

      // Initialise some things
      tmp_gstring = g_string_new(NULL);

      // Safety check
      slides = g_list_first(slides);
      slide_position = g_list_position(slides, current_slide);
      num_slides = g_list_length(slides);
      if (num_slides == (slide_position + 1))
            // We can't move the bottom most slide any further down, so just return

      // Swap the slides around
      this_slide_data = current_slide->data;
      next_slide = g_list_nth(slides, slide_position + 1);
      current_slide->data = next_slide->data;
      next_slide->data = this_slide_data;
      current_slide = next_slide;

      // Move the thumbnail down one position in the film strip list
      g_string_printf(tmp_gstring, "%u", slide_position);
      if (TRUE == gtk_tree_model_get_iter_from_string(GTK_TREE_MODEL(film_strip_store), &from_iter, tmp_gstring->str))
            if (debug_level) printf("slide_move_top: 'From' iter is valid\n");
            g_string_printf(tmp_gstring, "%u", slide_position + 1);
            if (TRUE == gtk_tree_model_get_iter_from_string(GTK_TREE_MODEL(film_strip_store), &to_iter, tmp_gstring->str))
                  if (debug_level) printf("slide_move_top: 'To' iter is valid\n");
                  gtk_list_store_move_after(GTK_LIST_STORE(film_strip_store), &from_iter, &to_iter);
      } else
            if (debug_level) printf("slide_move_top: 'From' iter is not valid\n");
      g_string_free(tmp_gstring, TRUE);

      // Scroll the film strip to show the new thumbnail position
      gtk_tree_view_get_cursor(GTK_TREE_VIEW(film_strip_view), &new_path, NULL);
      if (NULL != new_path)
            old_path = new_path;  // Make a backup of the old path, so we can free it
      new_path = gtk_tree_path_new_from_indices(slide_position + 1, -1);
      gtk_tree_view_set_cursor(GTK_TREE_VIEW(film_strip_view), new_path, NULL, FALSE);
      gtk_tree_view_scroll_to_cell(GTK_TREE_VIEW(film_strip_view), new_path, NULL, TRUE, 0.5, 0.0);
      if (NULL != old_path)
            gtk_tree_path_free(old_path);  // Free the old path

      // Set the changes made variable
      changes_made = TRUE;

      // Update the status bar
      gtk_statusbar_push(GTK_STATUSBAR(status_bar), statusbar_context, " Slide moved down");

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