developed beginnings of media node

app/project/item/item.cpp

@@ -60,12 +60,12 @@ void Item::remove_child(Item *c)
   c->parent_ = nullptr;
 }
 
-int Item::child_count()
+int Item::child_count() const
 {
   return children_.size();
 }
 
-Item *Item::child(int i)
+Item *Item::child(int i) const
 {
   return children_.at(i).get();
 }
@@ -116,6 +116,17 @@ Item *Item::parent() const
   return parent_;
 }
 
+const Item *Item::root() const
+{
+  const Item* item = this;
+
+  while (item->parent() != nullptr) {
+    item = item->parent();
+  }
+
+  return item;
+}
+
 bool Item::CanHaveChildren() const
 {
   return false;