line_ui/element/
impls.rs

1/*
2 * Copyright (c) 2025 Jasmine Tai. All rights reserved.
3 */
4
5use crate::element::Element;
6use crate::render::RenderChunk;
7
8impl<E: Element> Element for &'_ E {
9    fn width(&self) -> usize {
10        (*self).width()
11    }
12
13    fn render(&self) -> impl DoubleEndedIterator<Item = RenderChunk<'_>> {
14        (*self).render()
15    }
16}
17
18impl<E: Element> Element for [E] {
19    fn width(&self) -> usize {
20        self.iter().map(|e| e.width()).sum()
21    }
22
23    fn render(&self) -> impl DoubleEndedIterator<Item = RenderChunk<'_>> {
24        self.iter().flat_map(|e| e.render())
25    }
26}
27
28impl Element for () {
29    fn width(&self) -> usize {
30        0
31    }
32
33    fn render(&self) -> impl DoubleEndedIterator<Item = RenderChunk<'_>> {
34        std::iter::empty()
35    }
36}
37
38macro_rules! impl_element_for_tuple {
39    ( A $( $t:ident )* , 0 $( $n:tt )* ) => {
40        impl<A $(, $t)*> Element for (A, $($t),*)
41        where
42            A: Element,
43            $($t: Element,)*
44        {
45            fn width(&self) -> usize {
46                self.0.width()
47                $(+ self.$n.width())*
48            }
49
50            fn render(&self) -> impl DoubleEndedIterator<Item = RenderChunk<'_>> {
51                self.0.render()
52                $(.chain(self.$n.render()))*
53            }
54        }
55    };
56}
57
58impl_element_for_tuple!(A, 0);
59impl_element_for_tuple!(A B, 0 1);
60impl_element_for_tuple!(A B C, 0 1 2);
61impl_element_for_tuple!(A B C D, 0 1 2 3);
62impl_element_for_tuple!(A B C D E, 0 1 2 3 4);
63impl_element_for_tuple!(A B C D E F, 0 1 2 3 4 5);
64impl_element_for_tuple!(A B C D E F G, 0 1 2 3 4 5 6);
65impl_element_for_tuple!(A B C D E F G H, 0 1 2 3 4 5 6 7);
66impl_element_for_tuple!(A B C D E F G H I, 0 1 2 3 4 5 6 7 8);
67impl_element_for_tuple!(A B C D E F G H I J, 0 1 2 3 4 5 6 7 8 9);
line_ui/element/impls.rs

line_ui/element/
impls.rs
