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assoc types

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shadow cat
2025-08-10 05:19:00 -04:00
parent 58d9b32077
commit b6e43c157b
4 changed files with 29 additions and 21 deletions
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30
src/layout/widget.rs
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@@ -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(