Add simple egui counter app

rust-learning/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "rust-learning"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+eframe = "0.30.0"

rust-learning/src/main.rs

@@ -0,0 +1,54 @@
+use eframe::egui;
+
+fn main() -> eframe::Result {
+    let options = eframe::NativeOptions {
+        viewport: egui::ViewportBuilder::default().with_inner_size([320.0, 240.0]),
+        ..Default::default()
+    };
+
+    eframe::run_native(
+        "rust-learning",
+        options,
+        Box::new(|cc| Ok(Box::new(MyApp::new(cc)))),
+    )
+}
+
+struct MyApp {
+    counter: i32,
+}
+
+impl MyApp {
+    fn new(_cc: &eframe::CreationContext<'_>) -> Self {
+        Self { counter: 0 }
+    }
+}
+
+impl eframe::App for MyApp {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ui.heading("Hello eframe!");
+            ui.label("This is a simple eframe app.");
+
+            ui.horizontal(|ui| {
+                let counter_color = match self.counter {
+                    0 => egui::Color32::WHITE,
+                    _ if self.counter > 0 => egui::Color32::GREEN,
+                    _ => egui::Color32::RED,
+                };
+
+                ui.label("Counter:");
+                ui.label(egui::RichText::new(format!("{}", self.counter)).color(counter_color));
+            });
+
+            ui.horizontal(|ui| {
+                if ui.button("Increment").clicked() {
+                    self.counter += 1;
+                }
+
+                if ui.button("Decrement").clicked() {
+                    self.counter -= 1;
+                }
+            });
+        });
+    }
+}