strong & weak widgets

src/widget/position/span.rs

@@ -158,7 +158,7 @@ impl<const LEN: usize, Wa: WidgetArrLike<LEN, Tag>, Tag> FnOnce<(&mut Ui,)>
 
     extern "rust-call" fn call_once(self, args: (&mut Ui,)) -> Self::Output {
         Span {
-            children: self.children.ui(args.0).arr.to_vec(),
+            children: self.children.ui(args.0).arr.into_iter().collect(),
             dir: self.dir,
             gap: self.gap,
         }

src/widget/position/stack.rs

@@ -55,7 +55,7 @@ impl<const LEN: usize, Wa: WidgetArrLike<LEN, Tag>, Tag> FnOnce<(&mut Ui,)>
 
     extern "rust-call" fn call_once(self, args: (&mut Ui,)) -> Self::Output {
         Stack {
-            children: self.children.ui(args.0).arr.to_vec(),
+            children: self.children.ui(args.0).arr.into_iter().collect(),
             size: self.size,
         }
     }

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)
+    }
+}

src/widget/trait_fns.rs

@@ -123,7 +123,7 @@ widget_trait! {
         }
     }
 
-    fn to_any(self) -> impl WidgetRet {
+    fn to_any(self) -> impl WidgetIdFn {
         |ui| self.add(ui).any()
     }
 }