Introduce Program API

examples/custom_quad/src/main.rs

@@ -82,12 +82,10 @@ mod quad {
 }
 
 use iced::widget::{column, container, slider, text};
-use iced::{
-    Alignment, Color, Element, Length, Sandbox, Settings, Shadow, Vector,
-};
+use iced::{Alignment, Color, Element, Length, Shadow, Vector};
 
 pub fn main() -> iced::Result {
-    Example::run(Settings::default())
+    iced::run("Custom Quad - Iced", Example::update, Example::view)
 }
 
 struct Example {
@@ -109,9 +107,7 @@ enum Message {
     ShadowBlurRadiusChanged(f32),
 }
 
-impl Sandbox for Example {
-    type Message = Message;
-
+impl Example {
     fn new() -> Self {
         Self {
             radius: [50.0; 4],
@@ -124,10 +120,6 @@ impl Sandbox for Example {
         }
     }
 
-    fn title(&self) -> String {
-        String::from("Custom widget - Iced")
-    }
-
     fn update(&mut self, message: Message) {
         let [tl, tr, br, bl] = self.radius;
         match message {
@@ -203,3 +195,9 @@ impl Sandbox for Example {
             .into()
     }
 }
+
+impl Default for Example {
+    fn default() -> Self {
+        Self::new()
+    }
+}