vendor

egui/examples/confirm_exit/Cargo.toml

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+[package]
+name = "confirm_exit"
+version = "0.1.0"
+authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
+license = "MIT OR Apache-2.0"
+edition = "2021"
+rust-version = "1.65"
+publish = false
+
+
+[dependencies]
+eframe = { path = "../../crates/eframe", features = [
+    "__screenshot", # __screenshot is so we can dump a screenshot using EFRAME_SCREENSHOT_TO
+] }

egui/examples/confirm_exit/README.md

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+Example how to show a confirm dialog before exiting an application.
+
+```sh
+cargo run -p confirm_exit
+```
+
+![](screenshot.png)

egui/examples/confirm_exit/src/main.rs

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+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+
+use eframe::egui;
+
+fn main() -> Result<(), eframe::Error> {
+    let options = eframe::NativeOptions {
+        initial_window_size: Some(egui::vec2(320.0, 240.0)),
+        ..Default::default()
+    };
+    eframe::run_native(
+        "Confirm exit",
+        options,
+        Box::new(|_cc| Box::new(MyApp::default())),
+    )
+}
+
+#[derive(Default)]
+struct MyApp {
+    allowed_to_close: bool,
+    show_confirmation_dialog: bool,
+}
+
+impl eframe::App for MyApp {
+    fn on_close_event(&mut self) -> bool {
+        self.show_confirmation_dialog = true;
+        self.allowed_to_close
+    }
+
+    fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ui.heading("Try to close the window");
+        });
+
+        if self.show_confirmation_dialog {
+            // Show confirmation dialog:
+            egui::Window::new("Do you want to quit?")
+                .collapsible(false)
+                .resizable(false)
+                .show(ctx, |ui| {
+                    ui.horizontal(|ui| {
+                        if ui.button("Cancel").clicked() {
+                            self.show_confirmation_dialog = false;
+                        }
+
+                        if ui.button("Yes!").clicked() {
+                            self.allowed_to_close = true;
+                            frame.close();
+                        }
+                    });
+                });
+        }
+    }
+}