Display for Clock<T>

src/clock.rs

@@ -1,5 +1,6 @@
+use std::fmt;
 use std::marker::PhantomData;
-
+use std::time::Duration;
 use strum::Display;
 
 #[derive(Debug, Copy, Clone, Display, PartialEq, Eq)]
@@ -33,14 +34,30 @@ impl<T> Clock<T> {
         self.current_value = self.initial_value;
     }
 
-    pub fn format(&mut self) -> String {
-        let ms = self.current_value;
+    fn duration(&self) -> Duration {
+        Duration::from_millis(self.current_value)
+    }
 
-        let minutes = (ms % 3600000) / 60000;
-        let seconds = (ms % 60000) / 1000;
-        let tenths = (ms % 1000) / 100;
+    fn minutes(&self) -> u64 {
+        self.duration().as_secs() / 60
+    }
+    fn seconds(&self) -> u64 {
+        self.duration().as_secs() % 60
+    }
+    fn tenths(&self) -> u32 {
+        self.duration().subsec_millis() / 100
+    }
+}
 
-        format!("{:02}:{:02}.{}", minutes, seconds, tenths)
+impl<T> fmt::Display for Clock<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "{:02}:{:02}.{}",
+            self.minutes(),
+            self.seconds(),
+            self.tenths()
+        )
     }
 }
 

src/widgets/countdown.rs

@@ -45,7 +45,7 @@ impl StatefulWidget for &CountdownWidget {
     type State = Countdown;
     fn render(self, area: Rect, buf: &mut Buffer, state: &mut Self::State) {
         let h = Paragraph::new(state.headline.clone()).centered();
-        let c = Paragraph::new(state.clock.format()).centered();
+        let c = Paragraph::new(format!("{}", state.clock)).centered();
         let [v1, v2] = Layout::vertical([Constraint::Length(1), Constraint::Length(1)]).areas(area);
 
         h.render(v1, buf);

src/widgets/timer.rs

@@ -45,7 +45,7 @@ impl StatefulWidget for TimerWidget {
     type State = Timer;
     fn render(self, area: Rect, buf: &mut Buffer, state: &mut Self::State) {
         let h = Paragraph::new(state.headline.clone()).centered();
-        let c = Paragraph::new(state.clock.format()).centered();
+        let c = Paragraph::new(format!("{}", state.clock)).centered();
         let [v1, v2] = Layout::vertical([Constraint::Length(1), Constraint::Length(1)]).areas(area);
 
         h.render(v1, buf);