feat: add basic eframe/egui application

Cargo.toml

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+eframe = "0.27.2"

src/main.rs

@@ -1,3 +1,43 @@
-fn main() {
-    println!("Hello, world!");
+use eframe::egui;
+
+fn main() -> Result<(), eframe::Error> {
+    let options = eframe::NativeOptions {
+        viewport: egui::ViewportBuilder::default().with_inner_size([320.0, 240.0]),
+        ..Default::default()
+    };
+    eframe::run_native(
+        "My egui App",
+        options,
+        Box::new(|cc| Box::new(AmethystApp::new(cc))),
+    )
+}
+
+#[derive(Default)]
+struct AmethystApp {
+    name: String,
+    age: u32,
+}
+
+impl AmethystApp {
+    fn new(_: &eframe::CreationContext<'_>) -> Self {
+        Self::default()
+    }
+}
+
+impl eframe::App for AmethystApp {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ui.heading("My egui Application");
+            ui.horizontal(|ui| {
+                let name_label = ui.label("Your name: ");
+                ui.text_edit_singleline(&mut self.name)
+                    .labelled_by(name_label.id);
+            });
+            ui.add(egui::Slider::new(&mut self.age, 0..=120).text("age"));
+            if ui.button("Increment").clicked() {
+                self.age += 1;
+            }
+            ui.label(format!("Hello '{}', age {}", self.name, self.age));
+        });
+    }
 }