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unspeaker
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re foreign trait constraints
113 lines
4.7 KiB
Rust
113 lines
4.7 KiB
Rust
//! Aligns things to the container. Comes with caveats.
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//! ```
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//! use ::tengri::{output::*, tui::*};
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//! let area: [u16;4] = [10, 10, 20, 20];
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//! fn test (area: [u16;4], item: &impl Content<TuiOut>, expected: [u16;4]) {
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//! assert_eq!(Content::layout(item, area), expected);
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//! assert_eq!(Render::layout(item, area), expected);
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//! };
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//!
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//! let four = ||Fixed::xy(4, 4, "");
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//! test(area, &Align::nw(four()), [10, 10, 4, 4]);
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//! test(area, &Align::n(four()), [18, 10, 4, 4]);
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//! test(area, &Align::ne(four()), [26, 10, 4, 4]);
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//! test(area, &Align::e(four()), [26, 18, 4, 4]);
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//! test(area, &Align::se(four()), [26, 26, 4, 4]);
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//! test(area, &Align::s(four()), [18, 26, 4, 4]);
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//! test(area, &Align::sw(four()), [10, 26, 4, 4]);
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//! test(area, &Align::w(four()), [10, 18, 4, 4]);
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//!
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//! let two_by_four = ||Fixed::xy(4, 2, "");
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//! test(area, &Align::nw(two_by_four()), [10, 10, 4, 2]);
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//! test(area, &Align::n(two_by_four()), [18, 10, 4, 2]);
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//! test(area, &Align::ne(two_by_four()), [26, 10, 4, 2]);
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//! test(area, &Align::e(two_by_four()), [26, 19, 4, 2]);
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//! test(area, &Align::se(two_by_four()), [26, 28, 4, 2]);
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//! test(area, &Align::s(two_by_four()), [18, 28, 4, 2]);
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//! test(area, &Align::sw(two_by_four()), [10, 28, 4, 2]);
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//! test(area, &Align::w(two_by_four()), [10, 19, 4, 2]);
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//! ```
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use crate::*;
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#[derive(Debug, Copy, Clone, Default)]
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pub enum Alignment { #[default] Center, X, Y, NW, N, NE, E, SE, S, SW, W }
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pub struct Align<A>(Alignment, A);
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#[cfg(feature = "dsl")]
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impl<'n, State: Give<A>, A: 'n> Take<'n, State> for Align<A> {
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fn take <'source> (state: &State, words: &mut TokenIter<'source>) -> Perhaps<Self> {
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if let Some(Token { value: Value::Key(key), .. }) = words.peek() {
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match key {
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"align/c"|"align/x"|"align/y"|
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"align/n"|"align/s"|"align/e"|"align/w"|
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"align/nw"|"align/sw"|"align/ne"|"align/se" => {
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let _ = words.next().unwrap();
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let content = state.give_or_fail(&mut words.clone(), ||"expected content")?;
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return Ok(Some(match key {
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"align/c" => Self::c(content),
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"align/x" => Self::x(content),
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"align/y" => Self::y(content),
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"align/n" => Self::n(content),
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"align/s" => Self::s(content),
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"align/e" => Self::e(content),
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"align/w" => Self::w(content),
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"align/nw" => Self::nw(content),
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"align/ne" => Self::ne(content),
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"align/sw" => Self::sw(content),
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"align/se" => Self::se(content),
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_ => unreachable!()
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}))
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},
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_ => {}
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}
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}
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Ok(None)
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}
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}
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impl<A> Align<A> {
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#[inline] pub const fn c (a: A) -> Self { Self(Alignment::Center, a) }
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#[inline] pub const fn x (a: A) -> Self { Self(Alignment::X, a) }
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#[inline] pub const fn y (a: A) -> Self { Self(Alignment::Y, a) }
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#[inline] pub const fn n (a: A) -> Self { Self(Alignment::N, a) }
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#[inline] pub const fn s (a: A) -> Self { Self(Alignment::S, a) }
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#[inline] pub const fn e (a: A) -> Self { Self(Alignment::E, a) }
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#[inline] pub const fn w (a: A) -> Self { Self(Alignment::W, a) }
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#[inline] pub const fn nw (a: A) -> Self { Self(Alignment::NW, a) }
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#[inline] pub const fn sw (a: A) -> Self { Self(Alignment::SW, a) }
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#[inline] pub const fn ne (a: A) -> Self { Self(Alignment::NE, a) }
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#[inline] pub const fn se (a: A) -> Self { Self(Alignment::SE, a) }
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}
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impl<E: Output, A: Content<E>> Content<E> for Align<A> {
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fn content (&self) -> impl Render<E> + '_ {
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&self.1
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}
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fn layout (&self, on: E::Area) -> E::Area {
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use Alignment::*;
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let it = Render::layout(&self.content(), on).xywh();
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let cx = on.x()+(on.w().minus(it.w())/2.into());
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let cy = on.y()+(on.h().minus(it.h())/2.into());
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let fx = (on.x()+on.w()).minus(it.w());
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let fy = (on.y()+on.h()).minus(it.h());
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let [x, y] = match self.0 {
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Center => [cx, cy],
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X => [cx, it.y()],
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Y => [it.x(), cy],
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NW => [on.x(), on.y()],
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N => [cx, on.y()],
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NE => [fx, on.y()],
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W => [on.x(), cy],
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E => [fx, cy],
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SW => [on.x(), fy],
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S => [cx, fy],
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SE => [fx, fy],
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}.into();
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[x, y, it.w(), it.h()].into()
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}
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fn render (&self, to: &mut E) {
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to.place(Content::layout(self, to.area()), &self.content())
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}
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}
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