[docs] Improve README.md and documentation

example_glium/src/main.rs

@@ -1,25 +1,33 @@
+//! Example of how to use Egui
+
 #![deny(warnings)]
 #![warn(clippy::all)]
 
+use egui::{Slider, Window};
 use egui_glium::{storage::FileStorage, RunMode};
 
 /// We derive Deserialize/Serialize so we can persist app state on shutdown.
 #[derive(Default, serde::Deserialize, serde::Serialize)]
 struct MyApp {
-    counter: u64,
+    my_string: String,
+    value: f32,
 }
 
 impl egui::app::App for MyApp {
     /// This function will be called whenever the Ui needs to be shown,
     /// which may be many times per second.
     fn ui(&mut self, ui: &mut egui::Ui, _: &mut dyn egui::app::Backend) {
-        if ui.button("Increment").clicked {
-            self.counter += 1;
-        }
-        if ui.button("Reset").clicked {
-            self.counter = 0;
-        }
-        ui.label(format!("Counter: {}", self.counter));
+        let MyApp { my_string, value } = self;
+
+        // Example used in `README.md`.
+        Window::new("Debug").show(ui.ctx(), |ui| {
+            ui.label(format!("Hello, world {}", 123));
+            if ui.button("Save").clicked {
+                my_save_function();
+            }
+            ui.text_edit(my_string);
+            ui.add(Slider::f32(value, 0.0..=1.0).text("float"));
+        });
     }
 
     fn on_exit(&mut self, storage: &mut dyn egui::app::Storage) {
@@ -33,3 +41,7 @@ fn main() {
     let app: MyApp = egui::app::get_value(&storage, egui::app::APP_KEY).unwrap_or_default(); // Restore `MyApp` from file, or create new `MyApp`.
     egui_glium::run(title, RunMode::Reactive, storage, app);
 }
+
+fn my_save_function() {
+    // dummy
+}