fix Size, begin fixing View

src/space.rs

@@ -491,3 +491,24 @@ pub fn iter_west <
 > (_items: V, _cb: F) -> impl Draw<T> {
     thunk(move|_to: &mut T|{ todo!() })
 }
+
+#[derive(Default, Debug)]
+pub struct Size(AtomicUsize, AtomicUsize);
+impl X<u16> for Size {
+    fn x (&self) -> u16 { 0 }
+    fn w (&self) -> u16 { self.0.load(Relaxed) as u16 }
+}
+impl Y<u16> for Size {
+    fn y (&self) -> u16 { 0 }
+    fn h (&self) -> u16 { self.1.load(Relaxed) as u16 }
+}
+impl Size {
+    pub const fn of <T: Screen> (&self, of: impl Draw<T>) -> impl Draw<T> {
+        thunk(move|to: &mut T|{
+            let area = of.draw(to)?;
+            self.0.store(area.w().into(), Relaxed);
+            self.1.store(area.h().into(), Relaxed);
+            Ok(area)
+        })
+    }
+}