Add an eframe example app

README.md

@@ -45,7 +45,7 @@ If you have questions, use [Discussions](https://github.com/emilk/egui/discussio
 ui.heading("My Egui Application");
 ui.horizontal(|ui| {
     ui.label("Your name: ");
-    ui.text_edit(&mut name);
+    ui.text_edit_singleline(&mut name);
 });
 ui.add(egui::Slider::u32(&mut age, 0..=120).text("age"));
 if ui.button("Click each year").clicked {
@@ -54,7 +54,7 @@ if ui.button("Click each year").clicked {
 ui.label(format!("Hello '{}', age {}", name, age));
 ```
 
-<img src="media/demo-2020-10-24.png" width="40%">
+<img src="media/demo-2021-01-02.png" width="60%">
 
 ## Goals
 
@@ -66,7 +66,7 @@ ui.label(format!("Hello '{}', age {}", name, age));
 * A simple 2D graphics API for custom painting
 * No callbacks
 * Pure immediate mode
-* Extensible: [easy to write your own widgets for Egui](https://github.com/emilk/egui/blob/master/egui/src/demos/toggle_switch.rs)
+* Extensible: [easy to write your own widgets for Egui](https://github.com/emilk/egui/blob/master/egui_demo_lib/src/apps/demo/toggle_switch.rs)
 * Modular: You should be able to use small parts of Egui and combine them in new ways
 * Safe: there is no `unsafe` code in Egui
 * Minimal dependencies
@@ -97,7 +97,7 @@ The obvious alternative to Egui is [`imgui-rs`](https://github.com/Gekkio/imgui-
 * Egui is pure Rust
 * Egui is easily compiled to WASM
 * Egui lets you use native Rust String types (`imgui-rs` forces you to use annoying macros and wrappers for zero-terminated strings)
-* [Writing your own widgets in Egui is simple](https://github.com/emilk/egui/blob/master/egui/src/demos/toggle_switch.rs)
+* [Writing your own widgets in Egui is simple](https://github.com/emilk/egui/blob/master/egui_demo_lib/src/apps/demo/toggle_switch.rs)
 
 Egui also tries to improve your experience in other small ways:
 

eframe/examples/hello_world.rs

@@ -0,0 +1,45 @@
+use eframe::{egui, epi};
+
+struct MyApp {
+    name: String,
+    age: u32,
+}
+
+impl Default for MyApp {
+    fn default() -> Self {
+        Self {
+            name: "Arthur".to_owned(),
+            age: 42,
+        }
+    }
+}
+
+impl epi::App for MyApp {
+    fn name(&self) -> &str {
+        "My Egui App"
+    }
+
+    fn update(&mut self, ctx: &egui::CtxRef, frame: &mut epi::Frame<'_>) {
+        let Self { name, age } = self;
+
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ui.heading("My Egui Application");
+            ui.horizontal(|ui| {
+                ui.label("Your name: ");
+                ui.text_edit_singleline(name);
+            });
+            ui.add(egui::Slider::u32(age, 0..=120).text("age"));
+            if ui.button("Click each year").clicked {
+                *age += 1;
+            }
+            ui.label(format!("Hello '{}', age {}", name, age));
+        });
+
+        // Resize the native window to be just the size we need it to be:
+        frame.set_window_size(ctx.used_size());
+    }
+}
+
+fn main() {
+    eframe::run_native(Box::new(MyApp::default()));
+}