Скатал с официального примера из доков и доволен

code/Cargo.toml

@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+eframe = "0.34.2"
+egui = "0.34.2"

code/src/app.rs

@@ -0,0 +1,36 @@
+pub struct App{
+    label: String,
+}
+
+impl Default for App{
+    fn default() -> Self{
+        Self {
+            label: "This is BCS: Brewery Control System".to_owned()
+        }
+    }
+}
+
+impl App{
+    pub fn new(_cc: &eframe::CreationContext<'_>) -> Self{
+        Default::default()
+    }
+    
+}
+
+impl eframe::App for App{
+    fn ui(&mut self, ui: &mut egui::Ui, _frame: &mut eframe::Frame){
+
+        egui::Panel::top("top_panel").show_inside(ui, |ui| {
+            egui::MenuBar::new().ui(ui, |ui| {
+                egui::widgets::global_theme_preference_buttons(ui);
+            });
+        });
+        egui::CentralPanel::default().show_inside(ui, |ui|{
+            ui.heading("BCS");
+            ui.horizontal(|ui|{
+                ui.label("write something: ");
+                ui.text_edit_singleline(&mut self.label);
+            });
+        });
+    }
+}

code/src/lib.rs

@@ -0,0 +1,2 @@
+mod app;
+pub use app::App;

code/src/main.rs

@@ -1,3 +1,11 @@
-fn main() {
-    println!("Hello, world!");
-}
+fn main() -> eframe::Result{
+
+    let native_opts = eframe::NativeOptions {
+        viewport: egui::ViewportBuilder::default()
+            .with_inner_size([400.0,300.0])
+            .with_min_inner_size([300.0,200.0]),
+            ..Default::default()
+    };
+    eframe::run_native("BCS", native_opts, Box::new(|cc| Ok(Box::new(code::App::new(cc)))),)
+ 
+    } //Код не работает, ошибка пока и должна быть.