assoc types

src/base/mod.rs

@@ -117,12 +117,12 @@ impl<T: UINum> From<T> for Padding {
     }
 }
 
-pub trait WidgetUtil<W> {
-    fn pad(self, padding: impl Into<Padding>) -> impl WidgetLike<Regioned>;
+pub trait WidgetUtil {
+    fn pad(self, padding: impl Into<Padding>) -> impl WidgetLike<Widget = Regioned>;
 }
 
-impl<W: Widget, WL: WidgetLike<W>> WidgetUtil<W> for WL {
-    fn pad(self, padding: impl Into<Padding>) -> impl WidgetLike<Regioned> {
+impl<W: WidgetLike> WidgetUtil for W {
+    fn pad(self, padding: impl Into<Padding>) -> impl WidgetLike<Widget = Regioned> {
         WidgetFn(|ui| Regioned {
             region: padding.into().region(),
             inner: self.id(ui).erase_type(),
@@ -130,12 +130,12 @@ impl<W: Widget, WL: WidgetLike<W>> WidgetUtil<W> for WL {
     }
 }
 
-pub trait WidgetArrUtil<const LEN: usize, Ws> {
-    fn span(self, axis: Axis, ratios: [impl UINum; LEN]) -> impl WidgetLike<Span>;
+pub trait WidgetArrUtil<const LEN: usize> {
+    fn span(self, axis: Axis, ratios: [impl UINum; LEN]) -> impl WidgetLike<Widget = Span>;
 }
 
-impl<const LEN: usize, Ws, Wa: WidgetArrLike<LEN, Ws>> WidgetArrUtil<LEN, Ws> for Wa {
-    fn span(self, axis: Axis, ratios: [impl UINum; LEN]) -> impl WidgetLike<Span> {
+impl<const LEN: usize, Wa: WidgetArrLike<LEN>> WidgetArrUtil<LEN> for Wa {
+    fn span(self, axis: Axis, ratios: [impl UINum; LEN]) -> impl WidgetLike<Widget = Span> {
         WidgetFn(move |ui| Span::proportioned(axis, ratios, self.ui(ui).arr))
     }
 }

src/layout/ui.rs

@@ -42,7 +42,7 @@ impl UIBuilder {
         WidgetId::new(id, TypeId::of::<W>())
     }
 
-    pub fn finish<WL: WidgetLike<W>, W>(mut self, base: WL) -> UI {
+    pub fn finish<W: WidgetLike>(mut self, base: W) -> UI {
         let base = base.id(&mut self).erase_type();
         let mut ui = Rc::into_inner(self.ui).unwrap().into_inner();
         ui.base = Some(base);

src/layout/widget.rs

@@ -54,33 +54,38 @@ impl<W> WidgetId<W> {
     }
 }
 
-pub trait WidgetLike<W> {
-    fn id(self, ui: &mut UIBuilder) -> WidgetId<W>;
+pub trait WidgetLike {
+    type Widget;
+    fn id(self, ui: &mut UIBuilder) -> WidgetId<Self::Widget>;
 }
 
 /// wouldn't be needed if negative trait bounds & disjoint impls existed
 pub struct WidgetFn<F: FnOnce(&mut UIBuilder) -> W, W>(pub F);
 
-impl<W: Widget, F: FnOnce(&mut UIBuilder) -> W> WidgetLike<W> for WidgetFn<F, W> {
+impl<W: Widget, F: FnOnce(&mut UIBuilder) -> W> WidgetLike for WidgetFn<F, W> {
+    type Widget = W;
     fn id(self, ui: &mut UIBuilder) -> WidgetId<W> {
         let w = (self.0)(ui);
         ui.add(w).to_id()
     }
 }
 
-impl<W: Widget> WidgetLike<W> for W {
+impl<W: Widget> WidgetLike for W {
+    type Widget = W;
     fn id(self, ui: &mut UIBuilder) -> WidgetId<W> {
         ui.add(self).to_id()
     }
 }
 
-impl<W> WidgetLike<W> for WidgetId<W> {
+impl<W> WidgetLike for WidgetId<W> {
+    type Widget = W;
     fn id(self, _: &mut UIBuilder) -> WidgetId<W> {
         self
     }
 }
 
-impl<W> WidgetLike<W> for WidgetArr<1, (W,)> {
+impl<W> WidgetLike for WidgetArr<1, (W,)> {
+    type Widget = W;
     fn id(self, _: &mut UIBuilder) -> WidgetId<W> {
         let [id] = self.arr;
         id.cast_type()
@@ -116,11 +121,13 @@ impl<W> WidgetRef<W> {
     }
 }
 
-pub trait WidgetArrLike<const LEN: usize, Ws> {
-    fn ui(self, ui: &mut UIBuilder) -> WidgetArr<LEN, Ws>;
+pub trait WidgetArrLike<const LEN: usize> {
+    type Ws;
+    fn ui(self, ui: &mut UIBuilder) -> WidgetArr<LEN, Self::Ws>;
 }
 
-impl<const LEN: usize, Ws> WidgetArrLike<LEN, Ws> for WidgetArr<LEN, Ws> {
+impl<const LEN: usize, Ws> WidgetArrLike<LEN> for WidgetArr<LEN, Ws> {
+    type Ws = Ws;
     fn ui(self, _: &mut UIBuilder) -> WidgetArr<LEN, Ws> {
         self
     }
@@ -129,9 +136,10 @@ impl<const LEN: usize, Ws> WidgetArrLike<LEN, Ws> for WidgetArr<LEN, Ws> {
 // I hate this language it's so bad why do I even use it
 macro_rules! impl_node_arr {
     ($n:expr;$($T:tt)*) => {
-        impl<$($T,${concat($T,$T)}: WidgetLike<$T>,)*> WidgetArrLike<$n, ($($T,)*)> for ($(${concat($T,$T)},)*) {
+        impl<$($T: WidgetLike,)*> WidgetArrLike<$n> for ($($T,)*) {
+            type Ws = ($($T::Widget,)*);
             #[allow(unused_variables)]
-            fn ui(self, ui: &mut UIBuilder) -> WidgetArr<$n, ($($T,)*)> {
+            fn ui(self, ui: &mut UIBuilder) -> WidgetArr<$n, ($($T::Widget,)*)> {
                 #[allow(non_snake_case)]
                 let ($($T,)*) = self;
                 WidgetArr::new(

src/testing/mod.rs

@@ -1,7 +1,7 @@
 use std::sync::Arc;
 
 use app::App;
-use gui::{primitive::Axis, RoundedRect, UIColor, WidgetArrLike, WidgetArrUtil, WidgetUtil, UI};
+use gui::{primitive::Axis, RoundedRect, UIColor, WidgetArrUtil, WidgetUtil, UI};
 use render::Renderer;
 use winit::{event::WindowEvent, event_loop::ActiveEventLoop, window::Window};