improved state management

src/main.rs

@@ -29,20 +29,20 @@ fn init(states: &Arc<StateManager>) {
 fn app(states: &Arc<StateManager>, screen: &mut Screen) {
     screen.events.set_state_manager(states.clone());
 
-    let count = states.use_state(0);
+    let mut count = states.use_state(0);
 
     screen
         .draw(Rect(0xffffff))
         .component(Transform::center().dimensions(30, 3));
 
     screen
-        .draw(format!("Count: {}", count.get()))
+        .draw(format!("Count: {count}"))
         .component(Transform::center());
 
     screen.events.on(
         move |events: &Arc<EventManager>, event: &KeyEvent| match event.code {
             crossterm::event::KeyCode::Enter => {
-                count.set(count.get() + 1);
+                count += 1;
             }
             _ => {
                 events.close();

src/state.rs

@@ -1,7 +1,9 @@
 use std::{
     any::Any,
     collections::HashMap,
+    fmt::Display,
     marker::PhantomData,
+    ops::{Add, AddAssign, Div, Sub, SubAssign},
     sync::{Arc, Mutex},
 };
 
@@ -61,31 +63,96 @@ impl StateManager {
     }
 }
 
-impl<S: 'static + Clone + Send + Sync> State<S> {
+impl<S: 'static> State<S> {
     pub fn dirty(&self) {
         *self.manager.dirty.lock().unwrap() = true;
     }
+}
 
-    pub fn get(&self) -> S {
-        let store = self.manager.store.lock().unwrap();
-        let x = store[&self.id]
+impl<S: Display + 'static> Display for State<S> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.manager.store.lock().unwrap()[&self.id]
             .downcast_ref::<Mutex<S>>()
             .unwrap()
             .lock()
             .unwrap()
-            .clone();
-        x
+            .fmt(f)
     }
+}
 
-    pub fn set(&self, val: S) {
-        {
-            let store = self.manager.store.lock().unwrap();
-            *store[&self.id]
-                .downcast_ref::<Mutex<S>>()
-                .unwrap()
-                .lock()
-                .unwrap() = val;
-        }
+impl<S: Add + Clone + 'static> Add<S> for State<S> {
+    type Output = <S as Add>::Output;
+
+    fn add(self, rhs: S) -> Self::Output {
+        self.manager.store.lock().unwrap()[&self.id]
+            .downcast_ref::<Mutex<S>>()
+            .unwrap()
+            .lock()
+            .unwrap()
+            .clone()
+            .add(rhs)
+    }
+}
+
+impl<S: Sub + Clone + 'static> Sub<S> for State<S> {
+    type Output = <S as Sub>::Output;
+
+    fn sub(self, rhs: S) -> Self::Output {
+        self.manager.store.lock().unwrap()[&self.id]
+            .downcast_ref::<Mutex<S>>()
+            .unwrap()
+            .lock()
+            .unwrap()
+            .clone()
+            .sub(rhs)
+    }
+}
+
+impl<S: Div + Clone + 'static> Div<S> for State<S> {
+    type Output = <S as Div>::Output;
+
+    fn div(self, rhs: S) -> Self::Output {
+        self.manager.store.lock().unwrap()[&self.id]
+            .downcast_ref::<Mutex<S>>()
+            .unwrap()
+            .lock()
+            .unwrap()
+            .clone()
+            .div(rhs)
+    }
+}
+
+impl<S: AddAssign + 'static> AddAssign<S> for State<S> {
+    fn add_assign(&mut self, rhs: S) {
+        self.manager.store.lock().unwrap()[&self.id]
+            .downcast_ref::<Mutex<S>>()
+            .unwrap()
+            .lock()
+            .unwrap()
+            .add_assign(rhs);
         self.dirty();
     }
 }
+
+impl<S: SubAssign + 'static> SubAssign<S> for State<S> {
+    fn sub_assign(&mut self, rhs: S) {
+        self.manager.store.lock().unwrap()[&self.id]
+            .downcast_ref::<Mutex<S>>()
+            .unwrap()
+            .lock()
+            .unwrap()
+            .sub_assign(rhs);
+        self.dirty();
+    }
+}
+
+impl<S: PartialEq<S> + 'static> PartialEq<S> for State<S> {
+    fn eq(&self, other: &S) -> bool {
+        self.manager.store.lock().unwrap()[&self.id]
+            .downcast_ref::<Mutex<S>>()
+            .unwrap()
+            .lock()
+            .unwrap()
+            .eq(other)
+    }
+}