generated ui nodes indexing

src/graphics/ui/elements/UINode.cpp

@@ -1,5 +1,6 @@
 #include "UINode.h"
 
+#include "containers.h"
 #include "../../core/Batch2D.h"
 
 using gui::UINode;
@@ -256,3 +257,19 @@ void UINode::setGravity(Gravity gravity) {
         reposition();
     }
 }
+
+void UINode::getIndices(
+    std::shared_ptr<UINode> node,
+    std::unordered_map<std::string, std::shared_ptr<UINode>>& map
+) {
+    const std::string& id = node->getId();
+    if (!id.empty()) {
+        map[id] = node;
+    }
+    auto container = std::dynamic_pointer_cast<gui::Container>(node);
+    if (container) {
+        for (auto subnode : container->getNodes()) {
+            getIndices(subnode, map);
+        }
+    }
+}

src/graphics/ui/elements/UINode.h

@@ -6,6 +6,7 @@
 #include <memory>
 #include <string>
 #include <functional>
+#include <unordered_map>
 #include "../../../delegates.h"
 #include "../../../window/input.h"
 
@@ -193,6 +194,12 @@ namespace gui {
         void reposition();
 
         virtual void setGravity(Gravity gravity);
+
+        // @brief collect all nodes having id
+        static void getIndices(
+            std::shared_ptr<UINode> node,
+            std::unordered_map<std::string, std::shared_ptr<UINode>>& map
+        );
     };
 }