SDL_Rect menu::get_item_rect_internal(size_t item) const
{
//unsigned int first_item_on_screen = get_position();
unsigned int first_item_on_screen = get_position() / item_height_;
unsigned int leftovers = get_position() - (first_item_on_screen * item_height_);
if (item < first_item_on_screen ||
size_t(item) >= first_item_on_screen + max_items_onscreen() + 2) {
return empty_rect;
}
const std::map<int,SDL_Rect>::const_iterator i = itemRects_.find(item);
if(i != itemRects_.end())
return i->second;
SDL_Rect const &loc = inner_location();
int y = loc.y + heading_height();
if (item != first_item_on_screen) {
const SDL_Rect& prev = get_item_rect_internal(item-1);
y = prev.y + prev.h;
}
else
{
// KP: sub-item scrolling
y -= leftovers;
}
SDL_Rect res = { loc.x, y, loc.w, get_item_height(item) };
SDL_Rect const &screen_area = ::screen_area();
if(res.x > screen_area.w) {
return empty_rect;
} else if(res.x + res.w > screen_area.w) {
res.w = screen_area.w - res.x;
}
if(res.y > screen_area.h) {
return empty_rect;
} else if(res.y + res.h > screen_area.h) {
res.h = screen_area.h - res.y;
}
//only insert into the cache if the menu's co-ordinates have
//been initialized
if (loc.x > 0 && loc.y > 0)
itemRects_.insert(std::pair<int,SDL_Rect>(item,res));
return res;
}
SDL_Rect menu::get_item_rect(int item) const
{
return get_item_rect_internal(item_pos_[item]);
}