unspeaker/tengri
1
0
Fork 0
mirror of https://codeberg.org/unspeaker/tengri.git synced 2026-09-19 13:36:42 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

fokken wip

Browse source
This commit is contained in:
facile pop culture reference 2026-06-16 14:23:03 +03:00
parent be14173126
commit 2dc501c184
11 changed files with 129 additions and 136 deletions
Download patch file Download diff file Expand all files Collapse all files

43
src/draw/thunk.rs
View file

@ -1,16 +1,51 @@
use super::*;
pub const fn thunk <T: Screen, F: FnOnce(&mut T)->Usually<XYWH<T::Unit>>> (draw: F) -> Thunk<T, F> {
Thunk(draw, std::marker::PhantomData)
}
/// Because we can't implement [Draw] for `F: FnOnce...` without conflicts.
pub struct Thunk<T: Screen, F: FnOnce(&mut T)->Usually<XYWH<T::Unit>>>(
pub F,
std::marker::PhantomData<T>
);
impl<T: Screen, F: FnOnce(&mut T)->Usually<XYWH<T::Unit>>> Draw<T> for Thunk<T, F> {
fn draw (self, to: &mut T) -> Usually<XYWH<T::Unit>> {
(self.0)(to)
}
}
/// Basic [Draw]able closure.
///
/// ```
/// # use tengri::{draw::*, term::*};
/// # fn test () -> impl tengri::draw::Draw<tengri::term::Tui> {
/// thunk(|to: &mut Tui|Ok(to.1))
/// # }
/// ```
pub const fn thunk <T: Screen, F: FnOnce(&mut T)->Usually<XYWH<T::Unit>>> (
draw: F
) -> Thunk<T, F> {
Thunk(draw, std::marker::PhantomData)
}
/// Only render when condition is true.
///
/// ```
/// # use tengri::{draw::*, term::*};
/// # fn test () -> impl tengri::draw::Draw<tengri::term::Tui> {
/// when(true, "Yes")
/// # }
/// ```
pub const fn when <T: Screen> (condition: bool, draw: impl Draw<T>) -> impl Draw<T> {
thunk(move|to: &mut T|if condition { draw.draw(to) } else { Ok(Default::default()) })
}
/// Render one thing if a condition is true and another false.
///
/// ```
/// # use tengri::{draw::*, term::*};
/// # fn test () -> impl tengri::draw::Draw<tengri::term::Tui> {
/// either(true, "Yes", "No")
/// # }
/// ```
pub const fn either <T: Screen> (condition: bool, a: impl Draw<T>, b: impl Draw<T>) -> impl Draw<T> {
thunk(move|to: &mut T|if condition { a.draw(to) } else { b.draw(to) })
}