use eframe::CreationContext; #[derive(Default)] pub struct App; impl App { pub fn init(&mut self, _cc: &CreationContext) { } } impl eframe::App for App { fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) { use egui::*; egui::CentralPanel::default() .show(ctx, |ui| { ui.label("Hello World!"); }); } }