Add Desync widget to turn Widgets into AsyncWidgets

src/widget.rs

@@ -1,8 +1,8 @@
 use async_trait::async_trait;
 
 use crate::widgets::{
-    Background, Border, Boxed, BoxedAsync, Either2, Either3, Float, JoinSegment, Layer2, Padding,
-    Resize,
+    Background, Border, Boxed, BoxedAsync, Desync, Either2, Either3, Float, JoinSegment, Layer2,
+    Padding, Resize,
 };
 use crate::{Frame, Size, WidthDb};
 
@@ -53,6 +53,9 @@ pub trait WidgetExt: Sized {
     {
         BoxedAsync::new(self)
     }
+    fn desync(self) -> Desync<Self> {
+        Desync(self)
+    }
 
     fn first2<W2>(self) -> Either2<Self, W2> {
         Either2::First(self)

src/widgets.rs

@@ -2,6 +2,7 @@ pub mod background;
 pub mod border;
 pub mod boxed;
 pub mod cursor;
+pub mod desync;
 pub mod editor;
 pub mod either;
 pub mod empty;
@@ -17,6 +18,7 @@ pub use background::*;
 pub use border::*;
 pub use boxed::*;
 pub use cursor::*;
+pub use desync::*;
 pub use editor::*;
 pub use either::*;
 pub use empty::*;

src/widgets/desync.rs

@@ -0,0 +1,42 @@
+use async_trait::async_trait;
+
+use crate::{AsyncWidget, Widget};
+
+pub struct Desync<I>(pub I);
+
+impl<E, I> Widget<E> for Desync<I>
+where
+    I: Widget<E>,
+{
+    fn size(
+        &self,
+        widthdb: &mut crate::WidthDb,
+        max_width: Option<u16>,
+        max_height: Option<u16>,
+    ) -> Result<crate::Size, E> {
+        self.0.size(widthdb, max_width, max_height)
+    }
+
+    fn draw(self, frame: &mut crate::Frame) -> Result<(), E> {
+        self.0.draw(frame)
+    }
+}
+
+#[async_trait]
+impl<E, I> AsyncWidget<E> for Desync<I>
+where
+    I: Widget<E> + Send + Sync,
+{
+    async fn size(
+        &self,
+        widthdb: &mut crate::WidthDb,
+        max_width: Option<u16>,
+        max_height: Option<u16>,
+    ) -> Result<crate::Size, E> {
+        self.0.size(widthdb, max_width, max_height)
+    }
+
+    async fn draw(self, frame: &mut crate::Frame) -> Result<(), E> {
+        self.0.draw(frame)
+    }
+}