Purify Animation API and introduce application::timed

examples/clock/src/main.rs

@@ -11,7 +11,7 @@ use iced::{
 pub fn main() -> iced::Result {
     tracing_subscriber::fmt::init();
 
-    iced::application(Clock::default, Clock::update, Clock::view)
+    iced::application(Clock::new, Clock::update, Clock::view)
         .subscription(Clock::subscription)
         .theme(Clock::theme)
         .run()
@@ -28,6 +28,13 @@ enum Message {
 }
 
 impl Clock {
+    fn new() -> Self {
+        Self {
+            now: chrono::offset::Local::now(),
+            clock: Cache::default(),
+        }
+    }
+
     fn update(&mut self, message: Message) {
         match message {
             Message::Tick(local_time) => {
@@ -58,15 +65,6 @@ impl Clock {
     }
 }
 
-impl Default for Clock {
-    fn default() -> Self {
-        Self {
-            now: chrono::offset::Local::now(),
-            clock: Cache::default(),
-        }
-    }
-}
-
 impl<Message> canvas::Program<Message> for Clock {
     type State = ();