// select previous entry in current list
void tech_prev_entry()
{
//unload the current animation, we load another one for the new current entry
techroom_unload_animation();
Cur_entry--;
if (Cur_entry < 0) {
Cur_entry = Current_list_size - 1;
// scroll to end of list
List_offset = Cur_entry - Tech_list_coords[gr_screen.res][SHIP_H_COORD] / gr_get_font_height() + 1;
if (List_offset < 0) {
// this happens when there are not enough items to scroll
List_offset = 0;
}
Tech_slider.force_currentItem(Tech_slider.get_numberItems());
} else {
// maybe adjust list position by 1
if (List_offset > Cur_entry) {
tech_scroll_list_up();
Tech_slider.forceUp();
}
}
techroom_select_new_entry();
gamesnd_play_iface(SND_SCROLL);
}
// select next entry in current list
void tech_next_entry()
{
//unload the current animation, we load another one for the new current entry
techroom_unload_animation();
Cur_entry++;
if (Cur_entry >= Current_list_size) {
Cur_entry = 0;
// scroll to beginning of list
List_offset = 0;
Tech_slider.force_currentItem(Cur_entry);
} else {
// maybe adjust list position by 1
if (List_offset + Tech_list_coords[gr_screen.res][SHIP_H_COORD] / gr_get_font_height() <= Cur_entry) {
tech_scroll_list_down();
Tech_slider.forceDown();
}
}
techroom_select_new_entry();
gamesnd_play_iface(SND_SCROLL);
}