Add C++ variant of x0 framework with Qt and nlohmann::json

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C++ implementation of the x0 JavaScript framework using nlohmann::json for configuration management and Qt for graphical rendering.

Architecture

Maps 1:1 to JavaScript classes in /www/:

JavaScript	C++	Purpose
sysBaseDOMElement.js	x0BaseElement	Qt widget wrapper
sysBaseObject.js	x0BaseObject	Hierarchical object model
sysFactory.js	x0Factory	Singleton factory + screen management
sysScreen.js	x0Screen	View container
sysReactor.js	x0Reactor	Event dispatch
sysObjDiv.js	x0ObjDiv	Container (QFrame)
sysObjButton.js	x0ObjButton	Button (QPushButton)

Files Added

• cpp/CMakeLists.txt - Build config with Qt5/Qt6 support, auto-fetches nlohmann::json
• cpp/include/*.h - Core headers
• cpp/src/*.cpp - Implementations
• cpp/test/test_examples.cpp - Test validating all /example configurations
• cpp/README.md - Usage and extension guide

Usage

#include "x0Factory.h"

x0Factory& factory = x0Factory::instance();
factory.setDataSkeleton(skeletonJson);
factory.setDataObject(objectsJson);
factory.init();

// Access objects
x0BaseObject* btn = factory.getObjectById("MyButton");

Same JSON config format as JavaScript version:

{
    "ActionButton": {
        "Type": "Button",
        "Attributes": {
            "Style": "btn btn-primary",
            "TextID": "BTN.SUBMIT",
            "OnClick": "/api/submit"
        }
    }
}

Building

cd cpp && mkdir build && cd build
cmake .. && make

Testing

A test (cpp/test/test_examples.cpp) validates that the C++ framework correctly parses all 15 example configurations from /example:

Total examples tested: 15
Passed: 15
Failed: 0

Validated examples: add_object_table_column, basic_menu_screen, basic_tabcontainer, bootstrap_rowspan, copy_paste, enhanced_form, list_detail_switch_screen, list_dyn_radio, list_objectdata_grid, multi_tabcontainer, net_messages, object_instances, open_close_container, screen_overlay, tree_simple

Original prompt

According to the /www/ JavaScript version of the framework (base code), add a c++ variant of the code using nlohmann::json for object relations / configuration management and qt as screen rendering / graphical realtime output.

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[clauspruefer]

@copilot Take all examples found in /example to verify that this PR / code works correctly.

[Copilot]

@copilot Take all examples found in /example to verify that this PR / code works correctly.

Added a test (cpp/test/test_examples.cpp) that validates all 15 examples from /example directory. The test parses and validates all skeleton.json, object.json, and menu.json files to ensure the C++ framework's JSON handling works correctly with the existing configurations.

Test results (commit 8725a0a):

Total examples tested: 15
Passed: 15
Failed: 0

All examples validated successfully:

• add_object_table_column
• basic_menu_screen
• basic_tabcontainer
• bootstrap_rowspan
• copy_paste
• enhanced_form
• list_detail_switch_screen
• list_dyn_radio
• list_objectdata_grid
• multi_tabcontainer
• net_messages
• object_instances
• open_close_container
• screen_overlay
• tree_simple

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