Function LuaCloneTree

engine/gui/src/gui_script.cpp:3924–3972

clone a node including its children * Make a clone instance of a node and all its children. * Use gui.clone to clone a node excluding its children. * * @name gui.clone_tree * @param node [type:node] root node to clone * @return clones [type:table] a table mapping node ids to the corresponding cloned nodes */

     * @return clones [type:table] a table mapping node ids to the corresponding cloned nodes
     */
    static int LuaCloneTree(lua_State* L)
    {
        int top = lua_gettop(L);
        (void)top;

        lua_newtable(L);

        // Set meta table to convert string indices to hashes
        lua_createtable(L, 0, 1);
        lua_pushcfunction(L, HashTableIndex);
        lua_setfield(L, -2, "__index");
        lua_setmetatable(L, -2);

        Scene* scene = GuiScriptInstance_Check(L);
        dmGui::Result result;
        if (!lua_isnil(L, 1))
        {
            dmGui::HNode hnode;
            InternalNode* root = LuaCheckNodeInternal(L, 1, &hnode);
            dmGui::HNode out_node;
            result = CloneNodeToTable(L, scene, root, &out_node);
            if (result == dmGui::RESULT_OK)
            {
                dmGui::HNode parent = INVALID_HANDLE;
                if (root->m_ParentIndex != INVALID_INDEX)
                {
                    parent = GetNodeHandle(&scene->m_Nodes[root->m_ParentIndex]);
                }
                dmGui::SetNodeParent(scene, out_node, parent, false);
            }
        }
        else
        {
            result = CloneNodeListToTable(L, scene, scene->m_RenderHead, INVALID_HANDLE);
        }

        switch (result)
        {
        case dmGui::RESULT_OUT_OF_RESOURCES:
            lua_pop(L, 1);
            return luaL_error(L, "Not enough resources to clone the node tree");
        case dmGui::RESULT_OK:
            assert(top + 1 == lua_gettop(L));
            return 1;
        default:
            lua_pop(L, 1);
            return luaL_error(L, "An unexpected error occurred");
        }
    }

    static void PushNodeListToTable(lua_State* L, dmGui::HScene scene, uint16_t start_index);