add data model

src/main/cpp/kernel.cpp

@@ -8,8 +8,10 @@
 #include <android/asset_manager.h>
 #include <RmlUi/Core.h>
 #include "RmlUi_Renderer_GL3.h"
-#include <ranges>
 #include <span>
+#include <ranges>
+#include <chrono>
+#include <format>
 
 using namespace aidl::com::omixlab::mosis;
 using namespace aidl::android::hardware;
@@ -128,6 +130,14 @@ void Kernel::main_loop()
     Rml::LoadFontFace("LatoLatin-Regular.ttf");
     Rml::LoadFontFace("NotoEmoji-Regular.ttf", true);
 
+    std::string status_time = "0";
+    Rml::DataModelHandle status_time_handle;
+    if (Rml::DataModelConstructor status_data_ctor = context->CreateDataModel("status-data"))
+    {
+        status_data_ctor.Bind("time", &status_time);
+        status_time_handle = status_data_ctor.GetModelHandle();
+    }
+
     // Now we are ready to load our document.
     Rml::ElementDocument* document = context->LoadDocument("demo.rml");
     document->Show();
@@ -147,6 +157,10 @@ void Kernel::main_loop()
         glClear(GL_COLOR_BUFFER_BIT);
         glViewport(0, 0, 540, 960);
 
+        status_time = std::format("{:%H:%M:%S}",
+            std::chrono::floor<std::chrono::seconds>(std::chrono::system_clock::now()));
+        status_time_handle.DirtyAllVariables();
+
         context->Update();
         rmlui_render_interface.SetViewport(540, 960);
         rmlui_render_interface.BeginFrame();