fix sized bounds

src/core/trait_fns.rs

@@ -4,7 +4,7 @@ use crate::prelude::*;
 // these methods should "not require any context" (require unit) because they're in core
 event_ctx!(());
 
-pub trait CoreWidget<W, Tag> {
+pub trait CoreWidget<W: ?std::marker::Sized, Tag> {
     fn pad(self, padding: impl Into<Padding>) -> impl WidgetFn<Pad>;
     fn align(self, align: impl Into<Align>) -> impl WidgetFn<Aligned>;
     fn center(self) -> impl WidgetFn<Aligned>;

src/layout/attr.rs

@@ -1,11 +1,11 @@
 use crate::layout::{Ui, WidgetRef, WidgetIdFn, WidgetLike};
 
-pub trait WidgetAttr<W> {
+pub trait WidgetAttr<W: ?Sized> {
     type Input;
     fn run(ui: &mut Ui, id: &WidgetRef<W>, input: Self::Input);
 }
 
-pub trait Attrable<W, Tag> {
+pub trait Attrable<W: ?Sized, Tag> {
     fn attr<A: WidgetAttr<W>>(self, input: A::Input) -> impl WidgetIdFn<W>;
 }
 

src/layout/event.rs

@@ -17,7 +17,7 @@ pub struct EventCtx<'a, Ctx, Data> {
 }
 
 pub type ECtx<'a, Ctx, Data, W> = EventIdCtx<'a, Ctx, Data, W>;
-pub struct EventIdCtx<'a, Ctx, Data, W> {
+pub struct EventIdCtx<'a, Ctx, Data, W: ?Sized> {
     pub widget: &'a WidgetRef<W>,
     pub ui: &'a mut Ui,
     pub state: &'a mut Ctx,
@@ -27,7 +27,7 @@ pub struct EventIdCtx<'a, Ctx, Data, W> {
 pub trait EventFn<Ctx, Data>: Fn(EventCtx<Ctx, Data>) + 'static {}
 impl<F: Fn(EventCtx<Ctx, Data>) + 'static, Ctx, Data> EventFn<Ctx, Data> for F {}
 
-pub trait WidgetEventFn<Ctx, Data, W>: Fn(EventIdCtx<Ctx, Data, W>) + 'static {}
+pub trait WidgetEventFn<Ctx, Data, W: ?Sized>: Fn(EventIdCtx<Ctx, Data, W>) + 'static {}
 impl<F: Fn(EventIdCtx<Ctx, Data, W>) + 'static, Ctx, Data, W> WidgetEventFn<Ctx, Data, W> for F {}
 
 // TODO: naming in here is a bit weird like eventable
@@ -36,10 +36,11 @@ macro_rules! event_ctx {
     ($ty: ty) => {
         mod local_event_trait {
             use super::*;
+            use std::marker::Sized;
             #[allow(unused_imports)]
             use $crate::prelude::*;
 
-            pub trait EventableCtx<W, Tag, Ctx: 'static> {
+            pub trait EventableCtx<W: ?Sized, Tag, Ctx: 'static> {
                 fn on<E: Event>(
                     self,
                     event: E,
@@ -65,7 +66,7 @@ pub use event_ctx;
 pub mod eventable {
     use super::*;
 
-    pub trait Eventable<W, Tag> {
+    pub trait Eventable<W: ?Sized, Tag> {
         fn on<E: Event, Ctx: 'static>(
             self,
             event: E,

src/layout/ui.rs

@@ -42,7 +42,7 @@ impl Ui {
         self.data.textures.add(image)
     }
 
-    pub fn register_event<W, E: Event, Ctx: 'static>(
+    pub fn register_event<W: ?Sized, E: Event, Ctx: 'static>(
         &mut self,
         id: &WidgetRef<W>,
         event: E,

src/layout/widget.rs

@@ -3,7 +3,7 @@ use crate::{
     layout::{Len, Painter, SizeCtx, Ui, WidgetIdFn, WidgetRef},
 };
 
-use std::{any::Any, marker::PhantomData};
+use std::{any::Any, marker::Unsize};
 
 pub trait Widget: Any {
     fn draw(&mut self, painter: &mut Painter);
@@ -25,7 +25,7 @@ pub struct WidgetTag;
 pub struct FnTag;
 
 pub trait WidgetLike<Tag> {
-    type Widget: Widget + 'static;
+    type Widget: Widget + ?Sized + Unsize<dyn Widget> + 'static;
 
     fn add(self, ui: &mut Ui) -> WidgetRef<Self::Widget>;
 
@@ -78,40 +78,27 @@ impl<W: Widget> WidgetLike<WidgetTag> for W {
     }
 }
 
-pub struct WidgetArr<const LEN: usize, Ws> {
+pub struct WidgetArr<const LEN: usize> {
     pub arr: [WidgetRef; LEN],
-    _pd: PhantomData<Ws>,
 }
 
-impl<const LEN: usize, Ws> WidgetArr<LEN, Ws> {
+impl<const LEN: usize> WidgetArr<LEN> {
     pub fn new(arr: [WidgetRef; LEN]) -> Self {
-        Self {
-            arr,
-            _pd: PhantomData,
-        }
+        Self { arr }
     }
 }
 
 pub struct ArrTag;
 pub trait WidgetArrLike<const LEN: usize, Tag> {
-    type Ws;
-    fn ui(self, ui: &mut Ui) -> WidgetArr<LEN, Self::Ws>;
+    fn ui(self, ui: &mut Ui) -> WidgetArr<LEN>;
 }
 
-impl<const LEN: usize, Ws> WidgetArrLike<LEN, ArrTag> for WidgetArr<LEN, Ws> {
-    type Ws = Ws;
-    fn ui(self, _: &mut Ui) -> WidgetArr<LEN, Ws> {
+impl<const LEN: usize> WidgetArrLike<LEN, ArrTag> for WidgetArr<LEN> {
+    fn ui(self, _: &mut Ui) -> WidgetArr<LEN> {
         self
     }
 }
 
-impl<W: WidgetLike<WidgetTag>> WidgetArrLike<1, WidgetTag> for W {
-    type Ws = (W::Widget,);
-    fn ui(self, ui: &mut Ui) -> WidgetArr<1, (W::Widget,)> {
-        WidgetArr::new([self.add(ui).any()])
-    }
-}
-
 // I hate this language it's so bad why do I even use it
 macro_rules! impl_widget_arr {
     ($n:expr;$($W:ident)*) => {
@@ -119,8 +106,7 @@ macro_rules! impl_widget_arr {
     };
     ($n:expr;$($W:ident)*;$($Tag:ident)*) => {
         impl<$($W: WidgetLike<$Tag>,$Tag,)*> WidgetArrLike<$n, ($($Tag,)*)> for ($($W,)*) {
-            type Ws = ($($W::Widget,)*);
-            fn ui(self, ui: &mut Ui) -> WidgetArr<$n, ($($W::Widget,)*)> {
+            fn ui(self, ui: &mut Ui) -> WidgetArr<$n> {
                 #[allow(non_snake_case)]
                 let ($($W,)*) = self;
                 WidgetArr::new(

src/layout/widget_ref.rs

@@ -134,20 +134,22 @@ impl<W: ?Sized> Drop for Inner<W> {
 pub struct IdTag;
 pub struct IdFnTag;
 
-pub trait WidgetIdFn<W>: FnOnce(&mut Ui) -> WidgetRef<W> {}
-impl<W, F: FnOnce(&mut Ui) -> WidgetRef<W>> WidgetIdFn<W> for F {}
+pub trait WidgetIdFn<W: ?Sized>: FnOnce(&mut Ui) -> WidgetRef<W> {}
+impl<W: ?Sized, F: FnOnce(&mut Ui) -> WidgetRef<W>> WidgetIdFn<W> for F {}
 
 pub trait WidgetRet: FnOnce(&mut Ui) -> WidgetRef {}
 impl<F: FnOnce(&mut Ui) -> WidgetRef> WidgetRet for F {}
 
-impl<W: Widget + 'static> WidgetLike<IdTag> for WidgetRef<W> {
+impl<W: Widget + ?Sized + Unsize<dyn Widget> + 'static> WidgetLike<IdTag> for WidgetRef<W> {
     type Widget = W;
     fn add(self, _: &mut Ui) -> WidgetRef<W> {
         self
     }
 }
 
-impl<W: Widget + 'static, F: FnOnce(&mut Ui) -> WidgetRef<W>> WidgetLike<IdFnTag> for F {
+impl<W: Widget + ?Sized + Unsize<dyn Widget> + 'static, F: FnOnce(&mut Ui) -> WidgetRef<W>>
+    WidgetLike<IdFnTag> for F
+{
     type Widget = W;
     fn add(self, ui: &mut Ui) -> WidgetRef<W> {
         self(ui)