feat: Add TUIKLoader for dynamic UI loading from .tuik files

- Introduced TUIKLoader class to handle loading of UI components from JSON-like .tuik files.
- Implemented loadUI and getWidget methods in TUIApp to utilize TUIKLoader.
- Created example_2.cpp demonstrating dynamic UI loading and interaction.
- Added simple_ui.tuik file defining a basic UI layout with input fields and buttons.
- Enhanced TUIButton to allow setting text dynamically.
- Updated TUIGroupBox and TUITextField to improve rendering and initialization.
- Added debug logging throughout the loading process for better traceability.

Author: skhelladi

.vscode/settings.json

@@ -2,6 +2,7 @@
     "files.associations": {
         "system_error": "cpp",
         "functional": "cpp",
-        "chrono": "cpp"
+        "chrono": "cpp",
+        "atomic": "cpp"
     }
 }

CMakeLists.txt

@@ -23,6 +23,9 @@ endif()
 # FTXUI
 add_subdirectory(external/ftxui)
 
+# nlohmann/json (header-only)
+include_directories(external/json)
+
 # =============================================================================
 # PROJECT STRUCTURE
 # =============================================================================
@@ -83,11 +86,20 @@ set(TUIKIT_SOURCES
     src/widgets/TUITextArea.cpp
     src/widgets/TUITreeView.cpp
     src/widgets/Notification.cpp
+    src/core/TUIKLoader.cpp
     # Add other source files as they are created
 )
 
 set(EXAMPLE_SOURCES
-    examples/main.cpp
+    examples/example_1.cpp
+)
+
+set(EXAMPLE_2_SOURCES
+    examples/example_2.cpp
+)
+
+set(FTXUI_TEST_SOURCES
+    examples/ftxui_test.cpp
 )
 
 # =============================================================================
@@ -98,15 +110,24 @@ add_library(tuikit ${TUIKIT_SOURCES})
 target_include_directories(tuikit PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
     $<INSTALL_INTERFACE:include>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/external/json>
 )
 target_link_libraries(tuikit PUBLIC ftxui::screen ftxui::dom ftxui::component)
 
 # =============================================================================
-# EXAMPLE EXECUTABLE
+# EXAMPLE EXECUTABLE 1
 # =============================================================================
 
-add_executable(example_usage ${EXAMPLE_SOURCES})
-target_link_libraries(example_usage PRIVATE tuikit)
+add_executable(example_1 ${EXAMPLE_SOURCES})
+target_link_libraries(example_1 PRIVATE tuikit)
+
+# =============================================================================
+# EXAMPLE EXECUTABLE 2
+# =============================================================================
+
+add_executable(example_2 ${EXAMPLE_2_SOURCES})
+target_link_libraries(example_2 PRIVATE tuikit)
+
 
 
 # =============================================================================

debug_log.txt

@@ -0,0 +1,53 @@
+#include "tuikit.h"
+#include <iostream>
+#include <string>
+#include <fstream>
+
+using namespace TUIKIT;
+
+int main() {
+    std::ofstream cerr_log("debug_log_example2.txt");
+    std::streambuf* old_cerr_buf = std::cerr.rdbuf();
+    std::cerr.rdbuf(cerr_log.rdbuf());
+
+    TUIApp app("TUIKIT UI Loader Example");
+
+    // Load UI from .tuik file
+    auto main_ui_widget = app.loadUI("../examples/simple_ui.tuik");
+
+    if (!main_ui_widget) {
+        std::cerr << "Failed to load UI from simple_ui.tuik" << std::endl;
+        std::cout << "Failed to load UI from simple_ui.tuik" << std::endl;
+        return 1;
+    }
+
+    app.setMainWidget(main_ui_widget);
+
+    // Get named widgets
+    auto name_input = std::dynamic_pointer_cast<TUITextField>(app.getWidget("name_input"));
+    auto submit_button = std::dynamic_pointer_cast<TUIButton>(app.getWidget("submit_button"));
+    auto output_label = std::dynamic_pointer_cast<TUILabel>(app.getWidget("output_label"));
+
+    if (name_input && submit_button && output_label) {
+        connect(submit_button, [&] {
+            output_label->setText("Hello, " + name_input->text() + "!");
+        });
+    } else {
+        std::cerr << "Error: Could not find all required widgets by name." << std::endl;
+    }
+
+    app.setOnExit([&] {
+        std::cerr << "Application is exiting. Goodbye from example_2!" << std::endl;
+        std::cerr.rdbuf(old_cerr_buf);
+    });
+
+    int result = app.exec();
+
+    std::cerr.rdbuf(old_cerr_buf);
+
+    return result;
+
+    std::cerr.rdbuf(old_cerr_buf);
+
+    return result;
+}

examples/main.cpp examples/example_1.cppexamples/main.cpp renamed to examples/example_1.cpp

@@ -0,0 +1,47 @@
+{
+    "class": "TUIVBoxLayout",
+    "name": "main_layout",
+    "children": [
+        {
+            "class": "TUIGroupBox",
+            "name": "input_group",
+            "properties": {
+                "title": "Input & Button Example"
+            },
+            "content": {
+                "class": "TUIVBoxLayout",
+                "children": [
+                    {
+                        "class": "TUILabel",
+                        "name": "info_label",
+                        "properties": {
+                            "text": "Enter your name:"
+                        }
+                    },
+                    {
+                        "class": "TUITextField",
+                        "name": "name_input",
+                        "properties": {
+                            "placeholder": "Your name..."
+                        }
+                    },
+                    {
+                        "class": "TUIButton",
+                        "name": "submit_button",
+                        "properties": {
+                            "text": "Submit",
+                            "icon": "Rocket"
+                        }
+                    }
+                ]
+            }
+        },
+        {
+            "class": "TUILabel",
+            "name": "output_label",
+            "properties": {
+                "text": ""
+            }
+        }
+    ]
+}

examples/example_2.cpp

@@ -31,6 +31,7 @@
 
 #include "tuikit/core/TUIIcons.h"
 #include "tuikit/widgets/Notification.h"
+#include "tuikit/core/TUIKLoader.h"