strong & weak widgets

src/widget/ptr.rs

@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use std::marker::{Sized, Unsize};
 
 #[derive(Default)]
 pub struct WidgetPtr {
@@ -28,3 +29,19 @@ impl Widget for WidgetPtr {
         }
     }
 }
+
+impl WidgetPtr {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    pub fn set<W: ?Sized + Unsize<dyn Widget>>(&mut self, to: WidgetHandle<W>) {
+        self.inner = Some(to)
+    }
+
+    pub fn replace<W: ?Sized + Unsize<dyn Widget>>(
+        &mut self,
+        to: WidgetHandle<W>,
+    ) -> Option<WidgetHandle> {
+        self.inner.replace(to)
+    }
+}