Showcase graceful exiting in `events` example

examples/events/src/main.rs

@@ -1,22 +1,30 @@
 use iced::{
-    executor, Align, Application, Checkbox, Clipboard, Column, Command,
-    Container, Element, Length, Settings, Subscription, Text,
+    button, executor, Align, Application, Button, Checkbox, Clipboard, Column,
+    Command, Container, Element, HorizontalAlignment, Length, Settings,
+    Subscription, Text,
 };
+use iced_native::{window, Event};
 
 pub fn main() -> iced::Result {
-    Events::run(Settings::default())
+    Events::run(Settings {
+        exit_on_close_request: false,
+        ..Settings::default()
+    })
 }
 
 #[derive(Debug, Default)]
 struct Events {
     last: Vec<iced_native::Event>,
     enabled: bool,
+    exit: button::State,
+    should_exit: bool,
 }
 
 #[derive(Debug, Clone)]
 enum Message {
     EventOccurred(iced_native::Event),
     Toggled(bool),
+    Exit,
 }
 
 impl Application for Events {
@@ -38,27 +46,35 @@ impl Application for Events {
         _clipboard: &mut Clipboard,
     ) -> Command<Message> {
         match message {
-            Message::EventOccurred(event) => {
+            Message::EventOccurred(event) if self.enabled => {
                 self.last.push(event);
 
                 if self.last.len() > 5 {
                     let _ = self.last.remove(0);
                 }
             }
+            Message::EventOccurred(event) => {
+                if let Event::Window(window::Event::CloseRequested) = event {
+                    self.should_exit = true;
+                }
+            }
             Message::Toggled(enabled) => {
                 self.enabled = enabled;
             }
+            Message::Exit => {
+                self.should_exit = true;
+            }
         };
 
         Command::none()
     }
 
     fn subscription(&self) -> Subscription<Message> {
-        if self.enabled {
-            iced_native::subscription::events().map(Message::EventOccurred)
-        } else {
-            Subscription::none()
-        }
+        iced_native::subscription::events().map(Message::EventOccurred)
+    }
+
+    fn should_exit(&self) -> bool {
+        self.should_exit
     }
 
     fn view(&mut self) -> Element<Message> {
@@ -75,11 +91,22 @@ impl Application for Events {
             Message::Toggled,
         );
 
+        let exit = Button::new(
+            &mut self.exit,
+            Text::new("Exit")
+                .width(Length::Fill)
+                .horizontal_alignment(HorizontalAlignment::Center),
+        )
+        .width(Length::Units(100))
+        .padding(10)
+        .on_press(Message::Exit);
+
         let content = Column::new()
             .align_items(Align::Center)
             .spacing(20)
             .push(events)
-            .push(toggle);
+            .push(toggle)
+            .push(exit);
 
         Container::new(content)
             .width(Length::Fill)