Fix checkbox example

examples/checkbox/src/main.rs

@@ -1,10 +1,9 @@
+use iced::executor;
+use iced::font::{self, Font};
 use iced::widget::{checkbox, column, container};
-use iced::{Element, Font, Length, Sandbox, Settings};
+use iced::{Application, Command, Element, Length, Settings, Theme};
 
-const ICON_FONT: Font = Font::External {
-    name: "Icons",
-    bytes: include_bytes!("../fonts/icons.ttf"),
-};
+const ICON_FONT: Font = Font::Name("icons");
 
 pub fn main() -> iced::Result {
     Example::run(Settings::default())
@@ -20,24 +19,35 @@ struct Example {
 enum Message {
     DefaultChecked(bool),
     CustomChecked(bool),
+    FontLoaded(Result<(), font::Error>),
 }
 
-impl Sandbox for Example {
+impl Application for Example {
     type Message = Message;
+    type Flags = ();
+    type Executor = executor::Default;
+    type Theme = Theme;
 
-    fn new() -> Self {
-        Default::default()
+    fn new(_flags: Self::Flags) -> (Self, Command<Message>) {
+        (
+            Self::default(),
+            font::load(include_bytes!("../fonts/icons.ttf").as_ref())
+                .map(Message::FontLoaded),
+        )
     }
 
     fn title(&self) -> String {
         String::from("Checkbox - Iced")
     }
 
-    fn update(&mut self, message: Message) {
+    fn update(&mut self, message: Message) -> Command<Message> {
         match message {
             Message::DefaultChecked(value) => self.default_checkbox = value,
             Message::CustomChecked(value) => self.custom_checkbox = value,
+            Message::FontLoaded(_) => (),
         }
+
+        Command::none()
     }
 
     fn view(&self) -> Element<Message> {