+static void copy_custom_element_settings(int element_from, int element_to)
+{
+ struct ElementInfo *ei_from = &element_info[element_from];
+ struct ElementInfo *ei_to = &element_info[element_to];
+ int i, x, y;
+
+ /* ---------- copy element description ---------- */
+ for (i=0; i < MAX_ELEMENT_NAME_LEN + 1; i++)
+ ei_to->description[i] = ei_from->description[i];
+
+ /* ---------- copy element properties ---------- */
+ Properties[element_to][EP_BITFIELD_BASE] =
+ Properties[element_from][EP_BITFIELD_BASE];
+
+ /* ---------- copy custom property values ---------- */
+
+ ei_to->use_gfx_element = ei_from->use_gfx_element;
+ ei_to->gfx_element = ei_from->gfx_element;
+
+ ei_to->collect_score = ei_from->collect_score;
+ ei_to->collect_count = ei_from->collect_count;
+
+ ei_to->push_delay_fixed = ei_from->push_delay_fixed;
+ ei_to->push_delay_random = ei_from->push_delay_random;
+ ei_to->move_delay_fixed = ei_from->move_delay_fixed;
+ ei_to->move_delay_random = ei_from->move_delay_random;
+
+ ei_to->move_pattern = ei_from->move_pattern;
+ ei_to->move_direction_initial = ei_from->move_direction_initial;
+ ei_to->move_stepsize = ei_from->move_stepsize;
+
+ ei_to->slippery_type = ei_from->slippery_type;
+
+ for(y=0; y<3; y++)
+ for(x=0; x<3; x++)
+ ei_to->content[x][y] = ei_from->content[x][y];
+
+ ei_to->num_change_pages = ei_from->num_change_pages;
+ setElementChangePages(ei_to, ei_to->num_change_pages);
+
+ for (i=0; i < ei_to->num_change_pages; i++)
+ {
+ struct ElementChangeInfo *change_to = &ei_to->change_page[i];
+ struct ElementChangeInfo *change_from = &ei_from->change_page[i];
+
+ /* always start with reliable default values */
+ setElementChangeInfoToDefaults(change_to);
+
+ change_to->events = change_from->events;
+
+ change_to->target_element = change_from->target_element;
+
+ change_to->delay_fixed = change_from->delay_fixed;
+ change_to->delay_random = change_from->delay_random;
+ change_to->delay_frames = change_from->delay_frames;
+
+ change_to->trigger_element = change_from->trigger_element;
+
+ change_to->explode = change_from->explode;
+ change_to->use_content = change_from->use_content;
+ change_to->only_complete = change_from->only_complete;
+ change_to->use_random_change = change_from->use_random_change;
+
+ change_to->random = change_from->random;
+ change_to->power = change_from->power;
+
+ for(y=0; y<3; y++)
+ for(x=0; x<3; x++)
+ change_to->content[x][y] = change_from->content[x][y];
+
+ change_to->can_change = change_from->can_change;
+
+ change_to->sides = change_from->sides;
+ }
+
+ /* mark this custom element as modified */
+ ei_to->modified_settings = TRUE;
+}
+
+static void replace_custom_element_in_settings(int element_from,
+ int element_to)
+{
+ int i, j, x, y;
+
+ for (i=0; i < NUM_FILE_ELEMENTS; i++)
+ {
+ struct ElementInfo *ei = &element_info[i];
+
+ for(y=0; y<3; y++)
+ for(x=0; x<3; x++)
+ if (ei->content[x][y] == element_from)
+ ei->content[x][y] = element_to;
+
+ for (j=0; j < ei->num_change_pages; j++)
+ {
+ struct ElementChangeInfo *change = &ei->change_page[j];
+
+ if (change->target_element == element_from)
+ change->target_element = element_to;
+
+ if (change->trigger_element == element_from)
+ change->trigger_element = element_to;
+
+ for(y=0; y<3; y++)
+ for(x=0; x<3; x++)
+ if (change->content[x][y] == element_from)
+ change->content[x][y] = element_to;
+ }
+ }
+}
+
+static void replace_custom_element_in_playfield(int element_from,
+ int element_to)
+{
+ int x, y;
+
+ for(x=0; x < lev_fieldx; x++)
+ for(y=0; y < lev_fieldy; y++)
+ if (Feld[x][y] == element_from)
+ Feld[x][y] = element_to;
+}
+
+static void CopyCustomElement(int element_old, int element_new, int copy_mode)
+{
+ if (copy_mode == GADGET_ID_CUSTOM_COPY_FROM)
+ {
+ copy_custom_element_settings(element_new, element_old);
+ }
+ else if (copy_mode == GADGET_ID_CUSTOM_COPY_TO)
+ {
+ copy_custom_element_settings(element_old, element_new);
+ }
+ else if (copy_mode == GADGET_ID_CUSTOM_EXCHANGE)
+ {
+ copy_custom_element_settings(element_old, EL_DUMMY);
+ copy_custom_element_settings(element_new, element_old);
+ copy_custom_element_settings(EL_DUMMY, element_new);
+
+ replace_custom_element_in_settings(element_old, EL_DUMMY);
+ replace_custom_element_in_settings(element_new, element_old);
+ replace_custom_element_in_settings(EL_DUMMY, element_new);
+
+ replace_custom_element_in_playfield(element_old, EL_DUMMY);
+ replace_custom_element_in_playfield(element_new, element_old);
+ replace_custom_element_in_playfield(EL_DUMMY, element_new);
+ }
+
+ UpdateCustomElementGraphicGadgets();
+ DrawPropertiesWindow();
+}
+