Add example_web app

example_web/src/example_app.rs

@@ -0,0 +1,49 @@
+/// We derive Deserialize/Serialize so we can persist app state on shutdown.
+#[derive(serde::Deserialize, serde::Serialize)]
+pub struct ExampleApp {
+    name: String,
+    age: u32,
+}
+
+impl Default for ExampleApp {
+    fn default() -> Self {
+        Self {
+            name: "Arthur".to_owned(),
+            age: 42,
+        }
+    }
+}
+
+impl egui::app::App for ExampleApp {
+    /// Called each time the UI needs repainting, which may be many times per second.
+    /// Put your widgets into a `SidePanel`, `TopPanel`, `CentralPanel`, `Window` or `Area`.
+    fn ui(
+        &mut self,
+        ctx: &std::sync::Arc<egui::Context>,
+        integration_context: &mut egui::app::IntegrationContext,
+    ) {
+        let ExampleApp { name, age } = self;
+
+        // Example used in `README.md`.
+        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));
+
+            ui.advance_cursor(16.0);
+            if ui.button("Quit").clicked {
+                integration_context.output.quit = true;
+            }
+        });
+    }
+}