basically failed (too much code, slower (macros), no new features)

src/base/mod.rs

@@ -2,7 +2,8 @@ use std::ops::Range;
 
 use crate::{
     primitive::{Axis, Painter, RoundedRectData, UIRegion},
-    UIColor, Widget, WidgetArrLike, WidgetFn, WidgetId, WidgetLike,
+    ToId, UIColor, Widget, WidgetArrLike, WidgetFn, WidgetId, WidgetIdLikeTuple, WidgetLike,
+    WidgetLikeTuple,
 };
 
 #[derive(Clone, Copy)]
@@ -49,20 +50,18 @@ impl Widget for Span {
 }
 
 impl Span {
-    pub fn proportioned(
+    pub fn proportioned<const LEN: usize>(
         axis: Axis,
-        elements: impl IntoIterator<Item = (WidgetId, impl UINum)>,
+        ratios: [impl UINum; LEN],
+        elements: [WidgetId; LEN],
     ) -> Self {
-        // TODO: update
-        let elements = elements
-            .into_iter()
-            .map(|(w, r)| (w, r.to_f32()))
-            .collect::<Vec<_>>();
-        let total: f32 = elements.iter().map(|(_, r)| r).sum();
+        let ratios = ratios.map(|r| r.to_f32());
+        let total: f32 = ratios.iter().sum();
         let mut start = 0.0;
         Self {
             elements: elements
                 .into_iter()
+                .zip(ratios)
                 .map(|(e, r)| {
                     let end = start + r / total;
                     let res = (start..end, e);
@@ -119,26 +118,29 @@ impl<T: UINum> From<T> for Padding {
     }
 }
 
-pub trait WidgetUtil<W> {
+pub trait WidgetUtil {
     fn pad(self, padding: impl Into<Padding>) -> impl WidgetLike<Widget = Regioned>;
 }
 
-impl<W: WidgetLike> WidgetUtil<W::Widget> for W {
+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(),
+            inner: self.add(ui).erase_type(),
         })
     }
 }
 
-pub trait WidgetArrUtil<Wa: WidgetArrLike> {
-    fn span(self, axis: Axis, ratios: [impl UINum; Wa::LEN]) -> impl WidgetLike<Widget = Span>;
+pub trait WidgetArrUtil<const LEN: usize> {
+    fn span(self, axis: Axis, ratios: [impl UINum; LEN]) -> impl WidgetLike<Widget = Span>;
 }
 
-impl<Wa: WidgetArrLike> WidgetArrUtil<Wa> for Wa {
-    fn span(self, axis: Axis, ratios: [impl UINum; Wa::LEN]) -> impl WidgetLike<Widget = Span> {
-        WidgetFn(move |ui| Span::proportioned(axis, self.ui(ui).ids().into_iter().zip(ratios)))
+impl<const LEN: usize, Wa: WidgetArrLike<LEN>> WidgetArrUtil<LEN> for Wa
+where
+    <Wa::Ws as WidgetLikeTuple<LEN>>::Wrap<ToId>: WidgetIdLikeTuple<LEN>,
+{
+    fn span(self, axis: Axis, ratios: [impl UINum; LEN]) -> impl WidgetLike<Widget = Span> {
+        WidgetFn(move |ui| Span::proportioned(axis, ratios, self.ui(ui).erase_types()))
     }
 }
 

src/layout/ui.rs

@@ -32,7 +32,7 @@ impl From<UI> for UIBuilder {
 
 impl UIBuilder {
     pub fn add<W: Widget>(&mut self, w: W) -> WidgetRef<W> {
-        WidgetRef::new(self.clone(), (self.push(w), ()))
+        WidgetRef::new(self.clone(), (self.push(w),))
     }
 
     pub fn push<W: Widget>(&mut self, w: W) -> WidgetId<W> {
@@ -42,8 +42,8 @@ impl UIBuilder {
         WidgetId::new(id, TypeId::of::<W>())
     }
 
-    pub fn finish<WL: WidgetLike>(mut self, base: WL) -> UI {
-        let base = base.id(&mut self).erase_type();
+    pub fn finish<W: WidgetLike>(mut self, base: W) -> UI {
+        let base = base.add(&mut self).erase_type();
         let mut ui = Rc::into_inner(self.ui).unwrap().into_inner();
         ui.base = Some(base);
         ui

src/layout/widget.rs

@@ -5,7 +5,7 @@ use std::{
 
 use crate::{
     primitive::Painter,
-    util::{IntoTupleList, TupleList, ID},
+    util::{impl_tuple, ID},
     UIBuilder,
 };
 
@@ -27,7 +27,7 @@ pub struct WidgetId<W = ()> {
 }
 
 // TODO: temp
-impl<W> Clone for WidgetId<W> {
+impl<W: Widget> Clone for WidgetId<W> {
     fn clone(&self) -> Self {
         Self {
             ty: self.ty,
@@ -59,8 +59,8 @@ impl<W> WidgetId<W> {
 }
 
 pub trait WidgetLike {
-    type Widget;
-    fn id(self, ui: &mut UIBuilder) -> WidgetId<Self::Widget>;
+    type Widget: Widget;
+    fn add(self, ui: &mut UIBuilder) -> WidgetId<Self::Widget>;
 }
 
 /// wouldn't be needed if negative trait bounds & disjoint impls existed
@@ -68,7 +68,7 @@ pub struct WidgetFn<F: FnOnce(&mut UIBuilder) -> W, W>(pub F);
 
 impl<W: Widget, F: FnOnce(&mut UIBuilder) -> W> WidgetLike for WidgetFn<F, W> {
     type Widget = W;
-    fn id(self, ui: &mut UIBuilder) -> WidgetId<W> {
+    fn add(self, ui: &mut UIBuilder) -> WidgetId<W> {
         let w = (self.0)(ui);
         ui.add(w).to_id()
     }
@@ -76,111 +76,103 @@ impl<W: Widget, F: FnOnce(&mut UIBuilder) -> W> WidgetLike for WidgetFn<F, W> {
 
 impl<W: Widget> WidgetLike for W {
     type Widget = W;
-    fn id(self, ui: &mut UIBuilder) -> WidgetId<W> {
+    fn add(self, ui: &mut UIBuilder) -> WidgetId<W> {
         ui.add(self).to_id()
     }
 }
 
-impl<W> WidgetLike for WidgetId<W> {
+impl<W: Widget> WidgetLike for WidgetId<W> {
     type Widget = W;
-    fn id(self, _: &mut UIBuilder) -> WidgetId<W> {
+    fn add(self, _: &mut UIBuilder) -> WidgetId<W> {
         self
     }
 }
 
-pub struct WidgetArr<Ws: WidgetList> {
-    pub ui: UIBuilder,
-    pub arr: Ws::Ids,
+impl<W: Widget> WidgetLike for WidgetArr<1, (W,)> {
+    type Widget = W;
+    fn add(self, _: &mut UIBuilder) -> WidgetId<W> {
+        self.arr.0
+    }
 }
 
-impl<Ws: WidgetList> WidgetArr<Ws> {
-    pub fn new(ui: UIBuilder, arr: Ws::Ids) -> Self {
+pub struct WidgetArr<const LEN: usize, Ws: WidgetLikeTuple<LEN>> {
+    pub ui: UIBuilder,
+    pub arr: Ws::Wrap<ToId>,
+}
+
+impl<const LEN: usize, Ws: WidgetLikeTuple<LEN>> WidgetArr<LEN, Ws>
+where
+    Ws::Wrap<ToId>: WidgetIdLikeTuple<LEN>,
+{
+    pub fn new(ui: UIBuilder, arr: Ws::Wrap<ToId>) -> Self {
         Self { ui, arr }
     }
-    pub fn ids(self) -> Vec<WidgetId> {
-        self.arr.all()
+    pub fn erase_types(self) -> [WidgetId; LEN] {
+        self.arr.map::<EraseId>(&mut ())
     }
 }
 
-pub type WidgetRef<W> = WidgetArr<(W, ())>;
+pub type WidgetRef<W> = WidgetArr<1, (W,)>;
 
-impl<W> WidgetRef<W> {
-    pub fn handle(&self) -> WidgetId<W> {
-        self.arr.head().clone()
+impl<W: WidgetLike> WidgetRef<W> {
+    pub fn handle(&self) -> WidgetId<W::Widget> {
+        self.arr.0.clone()
     }
-    pub fn to_id(self) -> WidgetId<W> {
-        self.arr.into_head()
+    pub fn to_id(self) -> WidgetId<W::Widget> {
+        self.arr.0
     }
 }
 
-impl<W> WidgetLike for WidgetRef<W> {
-    type Widget = W;
-    fn id(self, _: &mut UIBuilder) -> WidgetId<W> {
-        self.arr.into_head()
-    }
+pub trait WidgetArrLike<const LEN: usize> {
+    type Ws: WidgetLikeTuple<LEN>;
+    fn ui(self, ui: &mut UIBuilder) -> WidgetArr<LEN, Self::Ws>;
 }
 
-pub trait WidgetArrLike {
-    const LEN: usize;
-    type Ws: WidgetList;
-    fn ui(self, ui: &mut UIBuilder) -> WidgetArr<Self::Ws>;
-}
-
-impl<Ws: WidgetList> WidgetArrLike for WidgetArr<Ws> {
-    const LEN: usize = Ws::LEN;
+impl<const LEN: usize, Ws: WidgetLikeTuple<LEN>> WidgetArrLike<LEN> for WidgetArr<LEN, Ws> {
     type Ws = Ws;
-    fn ui(self, _: &mut UIBuilder) -> WidgetArr<Ws> {
+    fn ui(self, _: &mut UIBuilder) -> WidgetArr<LEN, Ws> {
         self
     }
 }
 
-impl<W: WidgetLike> WidgetArrLike for (W, ())
-where
-    Self: TupleList,
-{
-    const LEN: usize = <Self as TupleList>::LEN;
-    type Ws = (W::Widget, ());
-    fn ui(self, ui: &mut UIBuilder) -> WidgetArr<(W::Widget, ())> {
-        WidgetArr::new(ui.clone(), (self.0.id(ui), ()))
-    }
+impl_tuple!(Widget);
+impl_tuple!(WidgetLike);
+impl_tuple!(WidgetIdLike);
+
+pub trait WidgetIdLike {
+    fn erase_type(self) -> WidgetId;
 }
-impl<W: WidgetLike, T: WidgetArrLike> WidgetArrLike for (W, T)
-where
-    Self: TupleList,
-{
-    const LEN: usize = <Self as TupleList>::LEN;
-    type Ws = (W::Widget, T::Ws);
-    fn ui(self, ui: &mut UIBuilder) -> WidgetArr<(W::Widget, T::Ws)> {
-        WidgetArr::new(ui.clone(), (self.0.id(ui), self.1.ui(ui).arr))
+
+impl<W> WidgetIdLike for WidgetId<W> {
+    fn erase_type(self) -> WidgetId {
+        self.erase_type()
     }
 }
 
-pub trait WidgetList: TupleList {
-    type Ids: IdList;
-}
-impl<H> WidgetList for (H, ()) {
-    type Ids = (WidgetId<H>, ());
-}
-impl<H, T: WidgetList> WidgetList for (H, T) {
-    type Ids = (WidgetId<H>, T::Ids);
+pub struct ToId;
+impl WidgetLikeWrapper for ToId {
+    type Wrap<T: WidgetLike> = WidgetId<T::Widget>;
+    type Ctx = UIBuilder;
+    fn wrap<T: WidgetLike>(t: T, ctx: &mut Self::Ctx) -> Self::Wrap<T> {
+        t.add(ctx)
+    }
 }
 
-pub trait IdList: TupleList {
-    fn iter(self) -> impl Iterator<Item = WidgetId>;
-    fn all(self) -> Vec<WidgetId>
-    where
-        Self: Sized,
-    {
-        self.iter().collect::<Vec<_>>()
+struct EraseId;
+impl WidgetIdLikeMapper for EraseId {
+    type Map = WidgetId<()>;
+    type Ctx = ();
+    fn map<Id: WidgetIdLike>(t: Id, _: &mut Self::Ctx) -> Self::Map {
+        t.erase_type()
     }
 }
-impl<H> IdList for (WidgetId<H>, ()) {
-    fn iter(self) -> impl Iterator<Item = WidgetId> {
-        core::iter::once(self.0.erase_type())
-    }
-}
-impl<H, T: IdList> IdList for (WidgetId<H>, T) {
-    fn iter(self) -> impl Iterator<Item = WidgetId> {
-        core::iter::once(self.0.erase_type()).chain(self.1.iter())
+
+impl<T: WidgetLikeTuple<LEN>, const LEN: usize> WidgetArrLike<LEN> for T
+where
+    T::Wrap<ToId>: WidgetIdLikeTuple<LEN>,
+{
+    type Ws = T;
+    fn ui(self, ui: &mut UIBuilder) -> WidgetArr<LEN, T> {
+        WidgetArr::new(ui.clone(), self.wrap::<ToId>(ui))
     }
 }

src/lib.rs

@@ -3,11 +3,10 @@
 #![feature(const_trait_impl)]
 #![feature(const_from)]
 #![feature(trait_alias)]
-#![feature(generic_const_exprs)]
 
 mod layout;
 mod render;
-pub mod util;
+mod util;
 mod base;
 
 pub use layout::*;

src/testing/mod.rs

@@ -1,4 +1,3 @@
-use gui::util::IntoTupleList;
 use std::sync::Arc;
 
 use app::App;
@@ -39,19 +38,15 @@ impl Client {
                             rect.color(UIColor::ORANGE),
                             rect.color(UIColor::LIME).pad(10.0),
                         )
-                            .into_list()
-                            .span(Axis::Y, [1, 1].into()),
+                            .span(Axis::Y, [1, 1]),
                         rect.color(UIColor::YELLOW),
                     )
-                        .into_list()
                         .span(Axis::X, [2, 2, 1])
                         .pad(10),
                 )
-                    .into_list()
                     .span(Axis::X, [1, 3]),
                 rect.color(UIColor::GREEN),
             )
-                .into_list()
                 .span(Axis::Y, [3, 1])
                 .pad(10),
         );

src/util/id.rs

@@ -27,6 +27,7 @@ impl IDTracker {
         id
     }
 
+    // TODO: use this
     #[allow(dead_code)]
     pub fn free(&mut self, id: ID) {
         self.free.push(id);

src/util/tuple.rs

@@ -1,70 +1,54 @@
-pub trait TupleList {
-    const LEN: usize;
-    type Head;
-    type Tail;
-    fn into_head(self) -> Self::Head;
-    fn head(&self) -> &Self::Head;
-    fn split(self) -> (Self::Head, Self::Tail);
-}
-impl TupleList for () {
-    const LEN: usize = 0;
-    type Head = ();
-    type Tail = ();
-    fn head(&self) -> &Self::Head {
-        &()
-    }
-    fn into_head(self) -> Self::Head {}
-    fn split(self) -> (Self::Head, Self::Tail) {
-        ((), ())
-    }
-}
-impl<T, Rest: TupleList> TupleList for (T, Rest) {
-    const LEN: usize = Rest::LEN + 1;
-    type Head = T;
-    type Tail = Rest;
-    fn head(&self) -> &Self::Head {
-        &self.0
-    }
-    fn into_head(self) -> Self::Head {
-        self.0
-    }
-    fn split(self) -> (Self::Head, Self::Tail) {
-        (self.0, self.1)
-    }
-}
-
-pub trait IntoTupleList {
-    type List;
-    fn into_list(self) -> Self::List;
-}
-
-impl IntoTupleList for () {
-    type List = ();
-    fn into_list(self) -> Self::List {}
-}
-
 macro_rules! impl_tuple {
-    ($H:tt $($T:tt)*) => {
-        impl<$H, $($T,)*> IntoTupleList for ($H, $($T,)*) {
-            type List = ($H, <($($T,)*) as IntoTupleList>::List);
-            fn into_list(self) -> Self::List {
+    ($Tuple:ident $Bound:ident $Wrapper:ident $Mapper:ident $n:expr;$TL:tt $($T:tt)*) => {
         #[allow(non_snake_case)]
-                let ($H, $($T,)*) = self;
-                ($H, ($($T,)*).into_list())
+        impl<$($T: $Bound,)* $TL: $Bound> $Tuple<$n> for ($($T,)* $TL,) {
+            type Wrap<W: $Wrapper> = ($(W::Wrap<$T>,)* W::Wrap<$TL>,);
+            type Map<M: $Mapper> = [M::Map; $n];
+            fn wrap<W: $Wrapper>(self, ctx: &mut W::Ctx) -> ($(W::Wrap<$T>,)* W::Wrap<$TL>,) {
+                let ($($T,)* $TL,) = self;
+                ($(W::wrap($T, ctx),)* W::wrap($TL, ctx),)
+            }
+            fn map<M: $Mapper>(self, ctx: &mut M::Ctx) -> [M::Map; $n] {
+                let ($($T,)* $TL,) = self;
+                [$(M::map($T, ctx),)* M::map($TL, ctx)]
             }
         }
     };
-}
+    ($Tuple:ident, $Bound:ident, $Wrapper:ident, $Mapper:ident) => {
+        pub trait $Wrapper {
+            type Wrap<T: $Bound>;
+            type Ctx;
+            fn wrap<T: $Bound>(t: T, ctx: &mut Self::Ctx) -> Self::Wrap<T>;
+        }
 
-impl_tuple!(A);
-impl_tuple!(A B);
-impl_tuple!(A B C);
-impl_tuple!(A B C D);
-impl_tuple!(A B C D E);
-impl_tuple!(A B C D E F);
-impl_tuple!(A B C D E F G);
-impl_tuple!(A B C D E F G H);
-impl_tuple!(A B C D E F G H I);
-impl_tuple!(A B C D E F G H I J);
-impl_tuple!(A B C D E F G H I J K);
-impl_tuple!(A B C D E F G H I J K L);
+        pub trait $Mapper {
+            type Map;
+            type Ctx;
+            fn map<T: $Bound>(t: T, ctx: &mut Self::Ctx) -> Self::Map;
+        }
+
+        pub trait $Tuple<const LEN: usize> {
+            type Wrap<W: $Wrapper>;
+            type Map<M: $Mapper>;
+            fn map<M: $Mapper>(self, ctx: &mut M::Ctx) -> [M::Map; LEN];
+            fn wrap<W: $Wrapper>(self, ctx: &mut W::Ctx) -> Self::Wrap<W>;
+        }
+
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 1;A);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 2;A B);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 3;A B C);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 4;A B C D);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 5;A B C D E);
+        impl_tuple!($Tuple $Bound $Wrapper $Mapper 6;A B C D E F);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 7;A B C D E F G);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 8;A B C D E F G H);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 9;A B C D E F G H I);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 10;A B C D E F G H I J);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 11;A B C D E F G H I J K);
+        // impl_tuple!($Tuple $Bound $Wrapper $Mapper 12;A B C D E F G H I J K L);
+    };
+    ($Bound:ident) => {
+        impl_tuple!(${concat($Bound, Tuple)}, $Bound, ${concat($Bound, Wrapper)}, ${concat($Bound, Mapper)});
+    }
+}
+pub(crate) use impl_tuple;