ref nodes work fine now but need to complete Widget::clone implementations and add clone() to Shape classes to actually clone the OpenGL data

engine/layout.h

@@ -31,6 +31,7 @@ enum class kWidget : uint16_t
 {
     Border = const_hash("border"),
     Shape  = const_hash("shape"),
+    Ref    = const_hash("ref"),
 };
 
 enum class kShapeType : uint16_t
@@ -46,6 +47,16 @@ class Widget
 public:
     glm::mat4 mvp;
     glm::vec4 clip;
+    virtual std::unique_ptr<Widget> clone() = 0;
+    virtual void create() { }
+    virtual void draw() { }
+    virtual void parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* attr) { }
+};
+
+class WidgetRef : public Widget
+{
+public:
+    uint16_t id;
     virtual void create() { }
     virtual void draw() { }
     virtual void parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* attr) { }
@@ -58,6 +69,12 @@ public:
     glm::vec4 m_color;
     glm::vec4 m_border_color;
     float m_thinkness{ 1 };
+    virtual std::unique_ptr<Widget> clone() override
+    {
+        auto ret = std::make_unique<WidgetBorder>();
+        *ret = *this;
+        return std::move(ret);
+    }
     virtual void draw() override
     {
         ShaderManager::use(kShader::Color);
@@ -110,6 +127,12 @@ public:
     glm::vec4 m_border_color;
     float m_thinkness{ 1 };
     float m_radius{ .5f };
+    virtual std::unique_ptr<Widget> clone() override
+    {
+        auto ret = std::make_unique<WidgetShape>();
+        //*ret = *this;
+        return std::move(ret);
+    }
     virtual void create() override
     {
         switch (m_type)
@@ -186,6 +209,7 @@ class Node
 
     const Node* parent{ nullptr };
     YGNodeRef y_node{ nullptr };
+    class LayoutManager* m_manager;
 
 public:
     std::vector<Node> m_children;
@@ -253,6 +277,7 @@ public:
     void parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* attr);
     void load_internal(const tinyxml2::XMLElement* x_node);
     void draw();
+    Node clone();
 
     class iterator
     {
@@ -297,5 +322,5 @@ public:
     bool load(const char* path);
     bool reload();
     Node& operator[](uint16_t id) { return m_layouts[id]; }
-    Node& operator[](const char* ids) { return m_layouts[const_hash(ids)]; }
+    //Node& operator[](const char* ids) { return m_layouts[const_hash(ids)]; }
 };