Add ui helpers for finding a specific element type in element tree

libs/ui/include/psemek/ui/element.hpp

@@ -88,4 +88,35 @@ namespace psemek::ui
 		void post_delayed_callbacks() const;
 	};
 
+	template <typename Type>
+	Type * find_first_parent_of_type(element * e)
+	{
+		while (true)
+		{
+			if (!e)
+				return nullptr;
+
+			if (auto p = dynamic_cast<Type *>(e))
+				return p;
+
+			e = e->parent();
+		}
+	}
+
+	template <typename Type>
+	Type * find_last_parent_of_type(element * e)
+	{
+		Type * r = nullptr;
+		while (true)
+		{
+			if (auto p = find_first_parent_of_type<Type>(e))
+			{
+				r = p;
+				e = p->parent();
+			}
+			else
+				return r;
+		}
+	}
+
 }