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fix and coverage for layout modifiers
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facile pop culture reference 2026-08-06 18:29:03 +03:00
parent cf67185ffd
commit 799e497622
10 changed files with 456 additions and 460 deletions
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2
Justfile
View file

@ -13,7 +13,7 @@ cov:
CARGO_INCREMENTAL=0 RUSTFLAGS='-Cinstrument-coverage' \ CARGO_INCREMENTAL=0 RUSTFLAGS='-Cinstrument-coverage' \
time cargo test -j4 --workspace --profile coverage time cargo test -j4 --workspace --profile coverage
rm -rf target/coverage/html || true rm -rf target/coverage/html || true
time grcov . -s . {{grcov-binary}} {{grcov-ignore}} -t html -o target/coverage/html time grcov . -s . {{grcov-binary}} {{grcov-ignore}} -t html -o target/coverage/html && reset
cov-md: cov-md:
CARGO_INCREMENTAL=0 RUSTFLAGS='-Cinstrument-coverage' \ CARGO_INCREMENTAL=0 RUSTFLAGS='-Cinstrument-coverage' \

4
examples/mode_02.rs
View file

@ -42,9 +42,7 @@ impl_keywords!(Tui, XYWH<u16>, State [
kw_push, kw_push,
kw_tui_text, kw_tui_text,
kw_tui_fg, kw_tui_fg,
kw_tui_bg, kw_tui_bg
kw_color_g,
kw_color_rgb,
]); ]);
impl Interpret<Tui, Option<XYWH<u16>>> for State { impl Interpret<Tui, Option<XYWH<u16>>> for State {

1
shell.nix
View file

@ -14,6 +14,7 @@ in pkgs.mkShell.override {
pkgs.jack2 pkgs.jack2
]; ];
nativeBuildInputs = [ nativeBuildInputs = [
pkgs.grcov
pkgs.pkg-config pkgs.pkg-config
pkgs.clang pkgs.clang
pkgs.libclang pkgs.libclang

47
src/layout.rs
View file

@ -96,6 +96,53 @@ impl Sizer {
} }
} }
macro_rules! def_layout_modifier {
(
$Trait:ident ($fn_x:ident $fn_y:ident $fn_xy:ident),
$Struct:ident { $X:ident $Y:ident $XY:ident } $kw_name:ident $name:literal
|$self:ident, $to:ident| $body:block
) => {
impl<S: Screen, T: Draw<S>> $Trait<S> for T {}
pub trait $Trait<S: Screen>: Draw<S> + Sized {
fn $fn_x <N: Into<Option<S::Unit>> + Copy> (self, x: N)
-> $Struct<S, Self, N> { $Struct::$X(self, x) }
fn $fn_y <N: Into<Option<S::Unit>> + Copy> (self, y: N)
-> $Struct<S, Self, N> { $Struct::$Y(self, y) }
fn $fn_xy <N: Into<Option<S::Unit>> + Copy> (self, x: N, y: N)
-> $Struct<S, Self, N> { $Struct::$XY(self, x, y) }
}
pub enum $Struct<S: Screen, I: Draw<S>, X: Into<Option<S::Unit>>> {
__(PhantomData<S>), $X(I, X), $Y(I, X), $XY(I, X, X),
}
impl <S: Screen, I: Draw<S>, X: Into<Option<S::Unit>> + Copy> Draw<S> for $Struct<S, I, X> {
fn draw (&$self, $to: &mut S) -> Perhaps<XYWH<S::Unit>> {
$body
}
}
fn_kw_layout!($kw_name |state, output, expr| {
let head = expr.head()?;
let mut frags = head.src()?.unwrap_or_default().split("/");
Ok(matches!(expr.head()?, Some("exact")).then(||{
let args = expr.tail();
let arg0 = args.head();
let tail0 = args.tail();
let arg1 = tail0.head();
let tail1 = tail0.tail();
let arg2 = tail1.head();
eval_xy!(
$name => expr, head, output, state, frags.next(),
$fn_xy, $fn_x, $fn_y,
arg0, arg1, arg2,
)
}).transpose()?.flatten())
});
}
}
mod area; pub use self::area::*; mod area; pub use self::area::*;
mod axis; pub use self::axis::*; mod axis; pub use self::axis::*;
mod azimuth; pub use self::azimuth::*; mod azimuth; pub use self::azimuth::*;

339
src/layout/axis.rs
View file

@ -1,138 +1,125 @@
use crate::*; use crate::*;
macro_rules! def_layout_modifier { /// Use whole drawing area along one or both axes.
( pub enum Full<T: Screen, I: Draw<T>> {
$Trait:ident ($fn_x:ident $fn_y:ident $fn_xy:ident), __(PhantomData<T>),
$Struct:ident { $X:ident $Y:ident $XY:ident } $kw_name:ident $name:literal W(I),
|$self:ident, $to:ident| $body:block H(I),
) => { WH(I),
impl<S: Screen, T: Draw<S>> $Trait<S> for T {} }
pub trait $Trait<S: Screen>: Draw<S> + Sized { impl_draw!(<T: Screen, I: Draw<T>,>|self: Full<T, I>, to: T|{
fn $fn_x <N: Into<Option<S::Unit>> + Copy> (self, x: N) let XYWH(x0, y0, w0, h0) = to.area();
-> $Struct<S, Self, N> { $Struct::$X(self, x) } let item = match self {
fn $fn_y <N: Into<Option<S::Unit>> + Copy> (self, y: N) Self::W(i) => i, Self::H(i) => i, Self::WH(i) => i, _ => unreachable!()
-> $Struct<S, Self, N> { $Struct::$Y(self, y) } };
fn $fn_xy <N: Into<Option<S::Unit>> + Copy> (self, x: N, y: N) let (x1, y1, w1, h1) = match self {
-> $Struct<S, Self, N> { $Struct::$XY(self, x, y) } Self::W(..) => (Some(x0), None, Some(w0), None),
} Self::H(..) => (None, Some(y0), None, Some(h0)),
Self::WH(..) => (Some(x0), Some(y0), Some(w0), Some(h0)),
_ => unreachable!()
};
Ok(to.draw(to.area(), item)?.map(|XYWH(x2, y2, w2, h2)|XYWH(
x1.unwrap_or(x2), y1.unwrap_or(y2), w1.unwrap_or(w2), h1.unwrap_or(h2),
)))
});
pub enum $Struct<S: Screen, I: Draw<S>, X: Into<Option<S::Unit>>> { #[cfg(test)] #[test] fn test_layout_full () -> Usually<()> {
__(PhantomData<S>), $X(I, X), $Y(I, X), $XY(I, X, X), assert_eq!(check_layout("1")?, Some(XYWH(1u16, 1, 1, 1)));
} assert_eq!(check_layout("1".full_w())?, Some(XYWH(1u16, 1, 80, 1)));
assert_eq!(check_layout("1".full_h())?, Some(XYWH(1u16, 1, 1, 25)));
impl <S: Screen, I: Draw<S>, X: Into<Option<S::Unit>> + Copy> Draw<S> for $Struct<S, I, X> { assert_eq!(check_layout("1".full_wh())?, Some(XYWH(1u16, 1, 80, 25)));
fn draw (&$self, $to: &mut S) -> Perhaps<XYWH<S::Unit>> { Ok(())
$body
}
}
fn_kw_layout!($kw_name |state, output, expr| {
let head = expr.head()?;
let mut frags = head.src()?.unwrap_or_default().split("/");
Ok(matches!(expr.head()?, Some("exact")).then(||{
let args = expr.tail();
let arg0 = args.head();
let tail0 = args.tail();
let arg1 = tail0.head();
let tail1 = tail0.tail();
let arg2 = tail1.head();
eval_xy!(
$name => expr, head, output, state, frags.next(),
$fn_xy, $fn_x, $fn_y,
arg0, arg1, arg2,
)
}).transpose()?.flatten())
});
}
} }
def_layout_modifier!( def_layout_modifier!(
CanExact (exact_w exact_h exact_wh), LayoutExact (exact_w exact_h exact_wh),
Exact { W H WH } kw_exact "exact" |self, to| { Exact { W H WH } kw_exact "exact" |self, to| {
let XYWH(x, y, w0, h0) = to.area();
let (item, w, h) = match self {
Self::W(item, w) => (item, (*w).into(), None),
Self::H(item, h) => (item, None, (*h).into()),
Self::WH(item, w, h) => (item, (*w).into(), (*h).into()),
_ => return Ok(None)
};
to.draw(XYWH(x, y, w.unwrap_or(w0), h.unwrap_or(h0)), item)
}
);
#[cfg(test)] #[test] fn test_layout_exact () -> Usually<()> {
assert_eq!(check_layout("FOOBAR\nKILROY")?, Some(XYWH(1, 1, 6, 2)));
assert_eq!(check_layout("FOOBAR\nKILROY".exact_w(3))?, Some(XYWH(1, 1, 3, 2)));
assert_eq!(check_layout("FOOBAR\nKILROY".exact_h(1))?, Some(XYWH(1, 1, 6, 1)));
assert_eq!(check_layout("FOOBAR\nKILROY".exact_wh(2, 1))?, Some(XYWH(1, 1, 2, 1)));
Ok(())
}
def_layout_modifier!(
LayoutMin (min_w min_h min_wh),
Min { W H WH } kw_min "min" |self, to| {
let XYWH(x0, y0, w0, h0) = to.area();
let (item, w1, h1) = match self {
Self::W(item, w1) => (item, (*w1).into(), None),
Self::H(item, h1) => (item, None, (*h1).into()),
Self::WH(item, w1, h1) => (item, (*w1).into(), (*h1).into()),
_ => return Ok(None)
};
Ok(to.draw(XYWH(
x0, y0,
w1.map(|w1|w1.max(w0)).unwrap_or(w0),
h1.map(|h1|h1.max(h0)).unwrap_or(h0)
), item)?.map(|XYWH(x2, y2, w2, h2)|XYWH(
x2, y2,
w1.map(|w1|w1.max(w2)).unwrap_or(w2),
h1.map(|h1|h1.max(h2)).unwrap_or(h2)
)))
}
);
#[cfg(test)] #[test] fn test_layout_min () -> Usually<()> {
assert_eq!(check_layout("1".min_w(5))?, Some(XYWH(1u16, 1, 5, 1)));
assert_eq!(check_layout("1".min_h(5))?, Some(XYWH(1u16, 1, 1, 5)));
assert_eq!(check_layout("1".min_wh(5, 5))?, Some(XYWH(1u16, 1, 5, 5)));
assert_eq!(check_layout("123456".min_w(5))?, Some(XYWH(1u16, 1, 6, 1)));
Ok(())
}
def_layout_modifier!(
LayoutMax (max_w max_h max_wh),
Max { W H WH } kw_max "max" |self, to| {
let XYWH(x, y, w0, h0) = to.area(); let XYWH(x, y, w0, h0) = to.area();
let (item, w, h) = match self { let (item, w, h) = match self {
Self::W(item, w) => (item, (*w).into().unwrap_or(w0), h0), Self::W(item, w) => (item, (*w).into().unwrap_or(w0), h0),
Self::H(item, h) => (item, w0, (*h).into().unwrap_or(h0)), Self::H(item, h) => (item, w0, (*h).into().unwrap_or(h0)),
Self::WH(item, w, h) => (item, (*w).into().unwrap_or(h0), (*h).into().unwrap_or(h0)), Self::WH(item, w, h) => (item, (*w).into().unwrap_or(h0), (*h).into().unwrap_or(h0)),
_ => unreachable!()
};
to.draw(XYWH(x, y, w, h), item)
}
);
def_layout_modifier!(
CanMin (min_w min_h min_wh),
Min { W H WH } kw_min "min" |self, to| {
match self {
Self::__(_) => unreachable!(),
Self::W(item, w1) if let Some(XYWH(x, y, w, h)) = to.size(None, item)? => {
let w: S::Unit = (*w1).into().map(|w1|w.max(w1)).unwrap_or(w);
to.draw(XYWH(x, y, w, h), item)
},
Self::H(item, h1) if let Some(XYWH(x, y, w, h)) = to.size(None, item)? => {
let h: S::Unit = (*h1).into().map(|h1|h.max(h1)).unwrap_or(h);
to.draw(XYWH(x, y, w, h), item)
},
Self::WH(item, w1, h1) if let Some(XYWH(x, y, w, h)) = to.size(None, item)? => {
let w: S::Unit = (*w1).into().map(|w1|w.max(w1)).unwrap_or(w);
let h: S::Unit = (*h1).into().map(|h1|h.max(h1)).unwrap_or(h);
to.draw(XYWH(x, y, w, h), item)
},
_ => Ok(None)
}
}
);
def_layout_modifier!(
CanMax (max_w max_h max_wh),
Max { W H WH } kw_max "max" |self, to| {
let area: XYWH<S::Unit> = to.area();
let (item, area) = match self {
Self::W(item, max_w) => (item, XYWH(
area.0, area.1, (*max_w).into().map(|max|max.min(area.2)).unwrap_or(area.2),
area.3
)),
Self::H(item, max_h) => (item, XYWH(
area.0, area.1, area.2,
(*max_h).into().map(|max|max.min(area.3)).unwrap_or(area.3)
)),
Self::WH(item, max_w, max_h) => (item, XYWH(
area.0, area.1, (*max_w).into().map(|max|max.min(area.2)).unwrap_or(area.2),
(*max_h).into().map(|max|max.min(area.3)).unwrap_or(area.3),
)),
_ => return Ok(None) _ => return Ok(None)
}; };
to.draw(area, item) to.draw(XYWH(x, y, if w0 > w { w } else { w0 }, if h0 > h { h } else { h0 }), item)
} }
); );
def_layout_modifier!( def_layout_modifier!(
CanPad (pad_w pad_h pad_wh), LayoutPad (pad_w pad_h pad_wh),
Pad { X Y XY } kw_pad "pad" |self, to| { Pad { X Y XY } kw_pad "pad" |self, to| {
let area = to.area(); let XYWH(x, y, w0, h0) = to.area();
let (item, area) = match self { let (item, w, h) = match self {
Self::X(item, w1) => { Self::X(item, w) => (item, (*w).into().unwrap_or_default(), Default::default()),
let w1: S::Unit = (*w1).into().unwrap_or_default(); Self::Y(item, h) => (item, Default::default(), (*h).into().unwrap_or_default()),
(item, XYWH(area.0 + w1, area.1, area.2.minus(w1 + w1), area.3)) Self::XY(item, w, h) => (item, (*w).into().unwrap_or_default(),
}, (*h).into().unwrap_or_default()),
Self::Y(item, h1) => {
let h1: S::Unit = (*h1).into().unwrap_or_default();
(item, XYWH(area.0, area.1 + h1, area.2, area.3.minus(h1 + h1)))
},
Self::XY(item, w1, h1) => {
let w1: S::Unit = (*w1).into().unwrap_or_default();
let h1: S::Unit = (*h1).into().unwrap_or_default();
(item, XYWH(area.0 + w1, area.1 + h1, area.2.minus(w1 + w1), area.3.minus(h1 + h1)))
},
_ => return Ok(None) _ => return Ok(None)
}; };
item.draw(to) to.draw(XYWH(
x.plus(w),
y.plus(h),
w0.minus(w).minus(w),
h0.minus(h).minus(h),
), item)
} }
); );
def_layout_modifier!( def_layout_modifier!(
CanPush (push_x push_y push_xy), LayoutPush (push_x push_y push_xy),
Push { X Y XY } kw_push "push" |self, to| { Push { X Y XY } kw_push "push" |self, to| {
match self { match self {
Self::__(_) => unreachable!(), Self::__(_) => unreachable!(),
@ -150,99 +137,47 @@ def_layout_modifier!(
} }
); );
def_layout_modifier!( #[cfg(test)] #[test] fn test_layout_push () -> Usually<()> {
CanPull (pull_x pull_y pull_xy), assert_eq!(check_layout("1")?, Some(XYWH(1u16, 1, 1, 1)));
Pull { X Y XY } kw_pull "pull" |self, to| { assert_eq!(check_layout("1".push_x(1))?, Some(XYWH(2u16, 1, 1, 1)));
todo!() assert_eq!(check_layout("1".push_y(1))?, Some(XYWH(1u16, 2, 1, 1)));
} assert_eq!(check_layout("1".push_xy(1, 1))?, Some(XYWH(2u16, 2, 1, 1)));
);
/// Use whole drawing area along one or both axes.
///
/// ```
/// # fn doctest_layout_full () -> Result<(), Box<dyn std::error::Error>> {
/// use tengri::{Layout, Draw, XYWH, Tui, Perhaps, Screen};
/// let area = XYWH(0u16, 0, 80, 25);
/// assert_eq!(layout("1")?, Some(XYWH(0u16, 0, 1, 1)));
/// assert_eq!(layout("1".full_w())?, Some(XYWH(0u16, 0, 80, 1)));
/// assert_eq!(layout("1".full_h())?, Some(XYWH(0u16, 0, 1, 25)));
/// assert_eq!(layout("1".full_wh())?, Some(XYWH(0u16, 0, 80, 25)));
/// fn layout (t: impl Draw<Tui>) -> Perhaps<XYWH<u16>> {
/// Tui::Layout(XYWH(0u16, 0, 80, 25)).size(None, t)
/// }
/// # Ok(()) }
/// ```
pub enum Full<T: Screen, I: Draw<T>> {
__(PhantomData<T>),
W(I),
H(I),
WH(I),
}
impl_draw!(<T: Screen, I: Draw<T>,>|self: Full<T, I>, to: T|{
let XYWH(x0, y0, w0, h0) = to.area();
match self {
Self::W(item) => if let Some(XYWH(_, y, _, h)) = to.size(None, item)? {
to.draw(XYWH(x0, y, w0, h), item)
} else {
Ok(None)
},
Self::H(item) => if let Some(XYWH(x, _, w, _)) = to.size(None, item)? {
to.draw(XYWH(x, y0, w, h0), item)
} else {
Ok(None)
},
Self::WH(item) => if let Some(XYWH(..)) = to.size(None, item)? {
to.draw(XYWH(x0, y0, w0, h0), item)
} else {
Ok(None)
},
_ => unreachable!(),
}
});
/// Only draw content if area is above a certain size.
///
/// ```
/// # fn doctest_layout_min () -> Result<(), Box<dyn std::error::Error>> {
/// use tengri::{Layout, Draw, XYWH};
/// let area = XYWH(1u16, 1, 80, 25);
/// assert_eq!("1".min_w(5).layout(area)?, Some(XYWH(1u16, 1, 5, 1)));
/// assert_eq!("1".min_h(5).layout(area)?, Some(XYWH(1u16, 1, 1, 5)));
/// assert_eq!("1".min_wh(5, 5).layout(area)?, Some(XYWH(1u16, 1, 5, 5)));
/// assert_eq!("123456".min_w(5).layout(area)?, Some(XYWH(1u16, 1, 6, 1)));
/// # Ok(()) }
/// ```
/// Move content in the negative direction of one or both axes.
///
/// ```
/// # fn doctest_layout_pull () -> Result<(), Box<dyn std::error::Error>> {
/// use tengri::{Layout, Draw, XYWH};
/// let area = XYWH(1u16, 1, 80, 25);
/// assert_eq!("1".layout(area)?, Some(XYWH(0u16, 0, 1, 1)));
/// assert_eq!("1".pull_x(1).layout(area)?, Some(XYWH(0u16, 1, 1, 1)));
/// assert_eq!("1".pull_y(1).layout(area)?, Some(XYWH(1u16, 0, 1, 1)));
/// assert_eq!("1".pull_xy(1, 1).layout(area)?, Some(XYWH(0u16, 0, 1, 1)));
/// # Ok(()) }
/// ```
/// Move content in the positive direction of one or both axes.
///
/// ```
/// # fn doctest_layout_push () -> Result<(), Box<dyn std::error::Error>> {
/// use tengri::{Layout, Draw, XYWH};
/// let area = XYWH(0u16, 0, 80, 25);
/// assert_eq!("1".layout(area)?, Some(XYWH(0u16, 0, 1, 1)));
/// assert_eq!("1".push_x(1).layout(area)?, Some(XYWH(1u16, 0, 1, 1)));
/// assert_eq!("1".push_y(1).layout(area)?, Some(XYWH(0u16, 1, 1, 1)));
/// assert_eq!("1".push_xy(1, 1).layout(area)?, Some(XYWH(1u16, 1, 1, 1)));
/// # Ok(()) }
/// ```
#[cfg(test)] #[test] fn test_exact () -> Usually<()> {
let mut screen = Tui::Layout(XYWH(0, 0, 80, 25));
assert_eq!("FOOBAR\nKILROY".draw(&mut screen)?, Some(XYWH(0, 0, 6, 2)));
assert_eq!("FOOBAR\nKILROY".exact_w(3).draw(&mut screen)?, Some(XYWH(0, 0, 3, 2)));
assert_eq!("FOOBAR\nKILROY".exact_h(1).draw(&mut screen)?, Some(XYWH(0, 0, 6, 1)));
assert_eq!("FOOBAR\nKILROY".exact_wh(2, 1).draw(&mut screen)?, Some(XYWH(0, 0, 2, 1)));
Ok(()) Ok(())
} }
def_layout_modifier!(
LayoutPull (pull_x pull_y pull_xy),
Pull { X Y XY } kw_pull "pull" |self, to| {
match self {
Self::__(_) => unreachable!(),
Self::X(item, x1) if let Some(XYWH(x, y, w, h)) = to.size(None, item)? => {
to.draw(XYWH(x.minus((*x1).into().unwrap_or_default()),
y,
w, h), item)
},
Self::Y(item, y1) if let Some(XYWH(x, y, w, h)) = to.size(None, item)? => {
to.draw(XYWH(x,
y.minus((*y1).into().unwrap_or_default()),
w, h), item)
},
Self::XY(item, x1, y1) if let Some(XYWH(x, y, w, h)) = to.size(None, item)? => {
to.draw(XYWH(x.minus((*x1).into().unwrap_or_default()),
y.minus((*y1).into().unwrap_or_default()),
w, h), item)
},
_ => Ok(None)
}
}
);
#[cfg(test)] #[test] fn test_layout_pull () -> Usually<()> {
assert_eq!(check_layout("1")?, Some(XYWH(1u16, 1, 1, 1)));
assert_eq!(check_layout("1".pull_x(1))?, Some(XYWH(0u16, 1, 1, 1)));
assert_eq!(check_layout("1".pull_y(1))?, Some(XYWH(1u16, 0, 1, 1)));
assert_eq!(check_layout("1".pull_xy(1, 1))?, Some(XYWH(0u16, 0, 1, 1)));
Ok(())
}
#[cfg(test)] fn check_layout (t: impl Draw<Tui>) -> Perhaps<XYWH<u16>> {
Tui::Layout(XYWH(1u16, 1, 80, 25)).size(None, t)
}

218
src/layout/azimuth.rs
View file

@ -34,7 +34,9 @@ impl<T: AsRef<Azimuth>> HasOrigin for T {
} }
fn_kw_layout!(kw_align |state, output, expr| { fn_kw_layout!(kw_align |state, output, expr| {
Ok(matches!(expr.head()?, Some("align")).then(||{ let head = expr.head();
let mut frags = head.src()?.unwrap_or_default().split("/");
Ok(matches!(frags.next(), Some("align")).then(||{
draw(move|output: &mut O|{state.interpret(output, &expr.tail().head())}).align( draw(move|output: &mut O|{state.interpret(output, &expr.tail().head())}).align(
eval_enum!("align", output, state, eval_enum!("align", output, state,
expr.head().src()?.unwrap_or_default().split("/").skip(1).next(), expr.head().src()?.unwrap_or_default().split("/").skip(1).next(),
@ -95,9 +97,13 @@ pub struct Align<T>(
impl<S: Screen, T: Draw<S>> Draw<S> for Align<T> { impl<S: Screen, T: Draw<S>> Draw<S> for Align<T> {
fn draw (&self, to: &mut S) -> Perhaps<XYWH<S::Unit>> { fn draw (&self, to: &mut S) -> Perhaps<XYWH<S::Unit>> {
let area = to.area(); let Self(azimuth, item) = self;
Ok(if let Some(area) = align::<S>(area, to.size(area, &self.1)?, self.0) { let area0 = to.area();
to.draw(area, &self.1)? let size = to.size(area0, item)?;
let area1 = align::<S>(area0, size, *azimuth);
//println!("\n\r{azimuth:?} {area0:?} {size:?}=>{area1:?}");
Ok(if let Some(area) = area1 {
to.draw(area, &item)?
} else { } else {
None None
}) })
@ -176,84 +182,6 @@ impl<S: Screen, A: Draw<S>, B: Draw<S>> Draw<S> for Pair<S, A, B> {
} }
} }
impl Split {
/// ```
/// use tengri::*;
/// let _ = Split::Above.stack(&"", &"");
/// let _ = Split::Below.stack(&"", &"");
/// let _ = Split::North.stack(&"", &"");
/// let _ = Split::South.stack(&"", &"");
/// let _ = Split::East.stack(&"", &"");
/// let _ = Split::West.stack(&"", &"");
/// ```
pub const fn stack <S: Screen, A: Draw<S>, B: Draw<S>> (&self, a: A, b: B) -> impl Draw<S> {
Pair(*self, a, b, PhantomData)
}
/// ```
/// use tengri::*;
/// let _ = Split::Above.half(&"", &"");
/// let _ = Split::Below.half(&"", &"");
/// let _ = Split::North.half(&"", &"");
/// let _ = Split::South.half(&"", &"");
/// let _ = Split::East.half(&"", &"");
/// let _ = Split::West.half(&"", &"");
/// ```
pub const fn half <S: Screen, A: Draw<S>, B: Draw<S>> (&self, a: &A, b: &B) -> impl Draw<S> {
draw(move|to: &mut S|{
let (area_a, area_b) = to.xywh().split_half(self);
let (origin_a, origin_b) = self.origins();
let (drawn_a, drawn_b) = draw_stacks(self, to, a, area_a, origin_a, b, area_b, origin_b)?;
Ok(stack_drawn(self, drawn_a, drawn_b))
})
}
/// Newly split areas begin at the center of the split
/// to maintain centeredness in the user's field of view.
///
/// Use [align] to override that and always start
/// at the top, bottom, etc.
///
/// ```
/// /*
///
/// Split east: Split south:
/// | | | | A |
/// | <-A|B-> | |---------|
/// | | | | B |
///
/// */
/// ```
const fn origins (&self) -> (Azimuth, Azimuth) {
use Azimuth::*;
match self {
Self::South => (S, N),
Self::East => (E, W),
Self::North => (N, S),
Self::West => (W, E),
Self::Above => (C, C),
Self::Below => (C, C),
}
}
///// ```
///// use tengri::*;
///// let _ = Split::Below.iter([
///// "Leftbar"
///// .min_w(10).max_w(15).align(Azimuth::NW),
///// "Rightbar"
///// .min_w(10).max_w(12).align(Azimuth::NE),
///// "Center"
///// .min_w(20).max_w(40).align(Azimuth::C),
///// ].iter());
///// ```
//pub fn iter <S: Screen, T: Draw<S>> (&self, _: impl Iterator<Item = T>) {
//todo!()
//}
}
fn draw_stacks <S: Screen> ( fn draw_stacks <S: Screen> (
split: &Split, split: &Split,
to: &mut S, to: &mut S,
@ -352,6 +280,108 @@ fn stack_drawn <S: Coord> (
} }
} }
impl Split {
/// ```
/// use tengri::*;
/// let _ = Split::Above.stack(&"", &"");
/// let _ = Split::Below.stack(&"", &"");
/// let _ = Split::North.stack(&"", &"");
/// let _ = Split::South.stack(&"", &"");
/// let _ = Split::East.stack(&"", &"");
/// let _ = Split::West.stack(&"", &"");
/// ```
pub const fn stack <S: Screen, A: Draw<S>, B: Draw<S>> (&self, a: A, b: B) -> impl Draw<S> {
Pair(*self, a, b, PhantomData)
}
/// ```
/// use tengri::*;
/// let _ = Split::Above.half(&"", &"");
/// let _ = Split::Below.half(&"", &"");
/// let _ = Split::North.half(&"", &"");
/// let _ = Split::South.half(&"", &"");
/// let _ = Split::East.half(&"", &"");
/// let _ = Split::West.half(&"", &"");
/// ```
pub const fn half <S: Screen, A: Draw<S>, B: Draw<S>> (&self, a: &A, b: &B) -> impl Draw<S> {
draw(move|to: &mut S|{
let (area_a, area_b) = to.xywh().split_half(self);
let (origin_a, origin_b) = self.origins();
let (drawn_a, drawn_b) = draw_stacks(self, to, a, area_a, origin_a, b, area_b, origin_b)?;
Ok(stack_drawn(self, drawn_a, drawn_b))
})
}
/// Newly split areas begin at the center of the split
/// to maintain centeredness in the user's field of view.
///
/// Use [align] to override that and always start
/// at the top, bottom, etc.
///
/// ```
/// /*
///
/// Split east: Split south:
/// | | | | A |
/// | <-A|B-> | |---------|
/// | | | | B |
///
/// */
/// ```
const fn origins (&self) -> (Azimuth, Azimuth) {
use Azimuth::*;
match self {
Self::South => (S, N),
Self::East => (E, W),
Self::North => (N, S),
Self::West => (W, E),
Self::Above => (C, C),
Self::Below => (C, C),
}
}
///// ```
///// use tengri::*;
///// let _ = Split::Below.iter([
///// "Leftbar"
///// .min_w(10).max_w(15).align(Azimuth::NW),
///// "Rightbar"
///// .min_w(10).max_w(12).align(Azimuth::NE),
///// "Center"
///// .min_w(20).max_w(40).align(Azimuth::C),
///// ].iter());
///// ```
//pub fn iter <S: Screen, T: Draw<S>> (&self, _: impl Iterator<Item = T>) {
//todo!()
//}
}
pub const fn east <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::East, a, b, PhantomData)
}
pub const fn north <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::North, a, b, PhantomData)
}
pub const fn west <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::West, a, b, PhantomData)
}
pub const fn south <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::South, a, b, PhantomData)
}
pub const fn above <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::Above, a, b, PhantomData)
}
pub const fn below <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::Below, a, b, PhantomData)
}
#[macro_export] macro_rules! north { #[macro_export] macro_rules! north {
($head:expr $(,)?) => { $head }; ($head:expr $(,)?) => { $head };
($head:expr, $($tail:expr),* $(,)?) => { north($head, north!($($tail,)*)) }; ($head:expr, $($tail:expr),* $(,)?) => { north($head, north!($($tail,)*)) };
@ -382,30 +412,6 @@ fn stack_drawn <S: Coord> (
($head:expr, $($tail:expr),* $(,)?) => { below($head, below!($($tail,)*)) }; ($head:expr, $($tail:expr),* $(,)?) => { below($head, below!($($tail,)*)) };
} }
pub const fn east <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::East, a, b, PhantomData)
}
pub const fn north <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::North, a, b, PhantomData)
}
pub const fn west <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::West, a, b, PhantomData)
}
pub const fn south <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::South, a, b, PhantomData)
}
pub const fn above <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::Above, a, b, PhantomData)
}
pub const fn below <S: Screen, A: Draw<S>, B: Draw<S>> (a: A, b: B) -> impl Draw<S> {
Pair(Split::Below, a, b, PhantomData)
}
#[cfg(test)] #[test] fn test_stack_areas () -> Usually<()> { #[cfg(test)] #[test] fn test_stack_areas () -> Usually<()> {
let area = XYWH(0u16, 0, 80, 25); let area = XYWH(0u16, 0, 80, 25);

17
src/layout/iter.rs
View file

@ -47,18 +47,21 @@ pub fn iter_south <'a, S: Screen, D: Draw<S>, I: Iterator<Item = D>> (
iter: impl Fn()->I iter: impl Fn()->I
) -> impl Draw<S> { ) -> impl Draw<S> {
draw(move|to: &mut S|{ draw(move|to: &mut S|{
let XYWH(x, mut y, w, mut h) = to.area(); let XYWH(x, y, w, h) = to.area();
let h0 = h; let mut y_next = y;
let mut h_used = S::Unit::zero();
for item in iter() { for item in iter() {
if let Some(used) = to.draw(Some(XYWH(x, y, w, h)), item)? { let area = XYWH(x, y_next, w, h.minus(h_used));
y = y.add(used.y()); if let Some(used) = to.draw(area, item)? {
h = h.minus(used.y()); let used_h = used.h();
if h == S::Unit::zero() { y_next = y_next.plus(used_h);
h_used = h_used.plus(used_h);
if h_used >= h {
break; break;
} }
} }
} }
Ok(Some(XYWH(x, y, w, h))) Ok(Some(XYWH(x, y, w, h_used)))
}) })
} }

2
src/lib.rs
View file

@ -1949,7 +1949,7 @@ macro_rules! eval_xy (
let mut chars = text.as_ref().chars(); let mut chars = text.as_ref().chars();
while let Some(c) = chars.next() { while let Some(c) = chars.next() {
width += c.width().unwrap_or(0) as u16; width += c.width().unwrap_or(0) as u16;
if width > max { if width >= max {
break break
} }
} }

240
src/term.rs
View file

@ -32,7 +32,6 @@ mod phat; pub use self::phat::*;
mod repeat; pub use self::repeat::*; mod repeat; pub use self::repeat::*;
mod scroll; pub use self::scroll::*; mod scroll; pub use self::scroll::*;
#[cfg(feature = "term")]
#[macro_export] macro_rules! tui_app { #[macro_export] macro_rules! tui_app {
($Struct:ident { $($fields:tt)* }) => { ($Struct:ident { $($fields:tt)* }) => {
#[dizzle::namespace(bool)] #[dizzle::namespace(bool)]
@ -47,18 +46,19 @@ mod scroll; pub use self::scroll::*;
} }
/// Implement standard [main] entrypoint for TUI apps. /// Implement standard [main] entrypoint for TUI apps.
#[cfg(feature = "term")]
#[macro_export] macro_rules! tui_main { #[macro_export] macro_rules! tui_main {
($state:expr) => { ($state:expr) => {
pub fn main () -> Usually<()> { pub fn main () -> Usually<()> {
tengri::Tui::setup_panic(); tengri::Tui::setup_panic();
tengri::Tui::run_main(::std::sync::Arc::new(::std::sync::RwLock::new($state))) Exit::run(|exit|tengri::Tui::run_main(
exit,
::std::sync::Arc::new(::std::sync::RwLock::new($state))
))
} }
} }
} }
/// Enable TUI output for state struct. /// Enable TUI output for state struct.
#[cfg(feature = "term")]
#[macro_export] macro_rules! tui_view { #[macro_export] macro_rules! tui_view {
($self:ident: $State:ty $body:block) => { ($self:ident: $State:ty $body:block) => {
impl tengri::View<Tui> for $State { impl tengri::View<Tui> for $State {
@ -68,7 +68,6 @@ mod scroll; pub use self::scroll::*;
} }
/// Enable TUI keyboard input for main state struct. /// Enable TUI keyboard input for main state struct.
#[cfg(feature = "term")]
#[macro_export] macro_rules! tui_keys { #[macro_export] macro_rules! tui_keys {
($self:ident:$State:ty,$input:ident $($body:tt)+) => { ($self:ident:$State:ty,$input:ident $($body:tt)+) => {
impl dizzle::Apply<TuiEvent, Usually<()>> for $State { impl dizzle::Apply<TuiEvent, Usually<()>> for $State {
@ -79,12 +78,14 @@ mod scroll; pub use self::scroll::*;
/// Terminal output. /// Terminal output.
pub enum Tui { pub enum Tui {
/// Draw mode: updates contained [Buffer].
Draw ( Draw (
/// Ratatui buffer; area is screen size /// Ratatui buffer; area is screen size
Buffer, Buffer,
/// Current draw area /// Current draw area
XYWH<u16> XYWH<u16>
), ),
/// Discard mode: only computes sizes
Layout ( Layout (
/// Draw area; no buffer /// Draw area; no buffer
XYWH<u16> XYWH<u16>
@ -96,6 +97,16 @@ impl Screen for Tui {
fn area (&self) -> XYWH<Self::Unit> { fn area (&self) -> XYWH<Self::Unit> {
self.into() self.into()
} }
fn size (
&mut self, area: impl Into<Option<XYWH<u16>>>, draw: impl Draw<Self>,
) -> Perhaps<XYWH<Self::Unit>> {
Self::Layout(self.area()).clip(area, &|to|draw.draw(to))
}
fn draw (
&mut self, area: impl Into<Option<XYWH<u16>>>, draw: impl Draw<Tui>
) -> Perhaps<XYWH<Self::Unit>> {
self.clip(area, &|to|draw.draw(to))
}
fn clip <T> ( fn clip <T> (
&mut self, area: impl Into<Option<XYWH<u16>>>, draw: &impl Fn(&mut Self)->T, &mut self, area: impl Into<Option<XYWH<u16>>>, draw: &impl Fn(&mut Self)->T,
) -> T { ) -> T {
@ -107,30 +118,6 @@ impl Screen for Tui {
*self.area_mut() = prev; *self.area_mut() = prev;
result result
} }
fn size (
&mut self, area: impl Into<Option<XYWH<u16>>>, draw: impl Draw<Self>,
) -> Perhaps<XYWH<Self::Unit>> {
Self::Layout(self.area()).clip(area, &|to|draw.draw(to))
}
fn draw (
&mut self, area: impl Into<Option<XYWH<u16>>>, draw: impl Draw<Tui>
) -> Perhaps<XYWH<Self::Unit>> {
self.clip(area, &|to|draw.draw(to))
}
//fn draw (
//&mut self,
//area: impl Into<Option<XYWH<u16>>>,
//draw: impl Draw<Self>
//) -> Perhaps<XYWH<Self::Unit>> {
//let prev = self.area();
//if let Some(area) = area.into() {
//*self.area_mut() = area.into();
//}
//let result = draw.draw(self);
//*self.area_mut() = prev;
//result
//}
} }
impl Tui { impl Tui {
@ -316,33 +303,6 @@ impl Tui {
}) })
} }
#[cfg(feature = "text")]
/// Write a line of text
///
/// TODO: do a paragraph (handle newlines)
pub fn text (&mut self, text: &impl AsRef<str>, x0: u16, y: u16, max_width: u16)
-> Perhaps<XYWH<u16>>
{
let text = text.as_ref();
let mut string_width: u16 = 0;
for character in text.chars() {
let x = x0 + string_width;
let character_width = character.width().unwrap_or(0) as u16;
string_width += character_width;
if string_width > max_width {
break
}
if let Self::Draw(buffer, ..) = self {
if let Some(cell) = buffer.cell_mut(ratatui::prelude::Position { x, y }) {
cell.set_char(character);
} else {
break
}
}
}
Ok(Some(XYWH(x0, y, string_width, 1)))
}
pub fn buffer (&mut self) -> Option<&mut Buffer> { pub fn buffer (&mut self) -> Option<&mut Buffer> {
if let Tui::Draw(buffer, _) = self { if let Tui::Draw(buffer, _) = self {
Some(buffer) Some(buffer)
@ -416,67 +376,7 @@ pub const fn fill_char (c: char) -> impl Draw<Tui> {
})))) }))))
} }
#[cfg(feature = "text")] impl_draw!(|self: String, to: Tui|{ /// FIXME: Don't use `format!` but implement number blitting
self.as_str().draw(to)
});
#[cfg(feature = "text")] impl_draw!(|self: std::sync::Arc<str>, to: Tui|{
self.as_ref().draw(to)
});
#[cfg(feature = "text")] impl_draw!(<T: AsRef<str>,>|self: TrimString<T>, to: Tui|{
self.as_ref().draw(to)
});
#[cfg(feature = "text")]
impl Draw<Tui> for &str {
fn draw (&self, to: &mut Tui) -> Drawn<u16> {
let XYWH(x, y, w, h) = to.area();
let mut max_w = 0u16;
let mut max_h = 0u16;
for (index, line) in self.split("\n").enumerate() {
max_h += 1;
max_w = max_w.max(line.len() as u16);
let _ = to.text(&line, x, y + index as u16, width_chars_max(w, line) as u16)?;
}
Ok(Some(XYWH(x, y, w.min(max_w), h.min(max_h))))
}
}
#[cfg(feature = "text")]
impl<'t, T: AsRef<str>> Draw<Tui> for TrimStr<'_, T> {
fn draw (&self, to: &mut Tui) -> Drawn<u16> {
let text = self.1.as_ref();
let area = layout_text_u16(text, to.area())?.unwrap();
let XYWH(x, y, w, ..) = to.area();
let mut width: u16 = 1;
let mut chars = text.chars();
while let Some(c) = chars.next() {
if width > self.0 || width > w {
break
}
to.set_char(x + width - 1, y, c);
width += c.width().unwrap_or(0) as u16;
}
let XYWH(x, y, w, ..) = XYWH(
to.x(), to.y(), to.w().min(self.0).min(self.1.as_ref().width() as u16), to.h()
);
to.text(&self.as_ref(), x, y, w)
}
}
#[cfg(feature = "text")]
fn layout_text_u16 (text: &str, area: XYWH<u16>) -> Perhaps<XYWH<u16>> {
let XYWH(x, y, w, h) = area;
let mut max_w = 0u16;
let mut max_h = 0u16;
for line in text.split("\n") {
max_h += 1;
max_w = max_w.max(line.len() as u16);
}
Ok(Some(XYWH(x, y, w.min(max_w), h.min(max_h))))
}
pub struct ShowSize; pub struct ShowSize;
impl Draw<Tui> for ShowSize { impl Draw<Tui> for ShowSize {
@ -500,16 +400,116 @@ impl<T: Draw<Tui>> Draw<Tui> for ShowSizeOf<T> {
#[cfg(feature = "eval")] fn_kw_layout_tui!(kw_tui_text |_state, output, expr| { #[cfg(feature = "eval")] fn_kw_layout_tui!(kw_tui_text |_state, output, expr| {
Ok(matches!(expr.head()?, Some("text")).then(||{ Ok(matches!(expr.head()?, Some("text")).then(||{
if let Some(src) = expr.tail().src()? { if let Some(src) = expr.tail().src()? && src.len() > 0 {
src.draw(output) (&src[1..]).draw(output)
} else { } else {
return Ok(None) return Ok(None)
} }
}).transpose()?.flatten()) }).transpose()?.flatten())
}); });
#[cfg(feature = "text")] #[cfg(test)] #[test] fn test_layout_text_u16 () -> Usually<()> { #[cfg(feature = "text")] pub use self::tui_text::*;
#[cfg(feature = "text")] mod tui_text {
use super::*;
impl Tui {
/// Write a line of text
///
/// TODO: do a paragraph (handle newlines)
pub fn text (&mut self, text: &impl AsRef<str>, x0: u16, y: u16, max_width: u16)
-> Perhaps<XYWH<u16>>
{
let text = text.as_ref();
let mut string_width: u16 = 0;
for character in text.chars() {
let x = x0 + string_width;
let character_width = character.width().unwrap_or(0) as u16;
string_width += character_width;
if string_width > max_width {
break
}
if let Self::Draw(buffer, ..) = self {
if let Some(cell) = buffer.cell_mut(ratatui::prelude::Position { x, y }) {
cell.set_char(character);
} else {
break
}
}
}
Ok(Some(XYWH(x0, y, string_width, 1)))
}
}
impl_draw!(|self: String, to: Tui|{
self.as_str().draw(to)
});
impl_draw!(|self: std::sync::Arc<str>, to: Tui|{
self.as_ref().draw(to)
});
impl_draw!(<T: AsRef<str>,>|self: TrimString<T>, to: Tui|{
self.as_ref().draw(to)
});
impl Draw<Tui> for &str {
fn draw (&self, to: &mut Tui) -> Drawn<u16> {
let XYWH(x, y, w, h) = to.area();
let mut max_w = 0u16;
let mut max_h = 0u16;
for (index, line) in self.split("\n").enumerate() {
let length = width_chars_max(w, line) as u16;
max_w = max_w.max(length);
max_h += 1;
if let Tui::Draw(..) = to {
let _ = to.text(&line, x, y + index as u16, length)?;
}
if max_h >= h {
break;
}
}
Ok(Some(XYWH(x, y, max_w, max_h)))
}
}
impl<'t, T: AsRef<str>> Draw<Tui> for TrimStr<'_, T> {
fn draw (&self, to: &mut Tui) -> Drawn<u16> {
let text = self.1.as_ref();
let area = layout_text_u16(text, to.area())?.unwrap();
let XYWH(x, y, w, ..) = to.area();
let mut width: u16 = 1;
let mut chars = text.chars();
while let Some(c) = chars.next() {
if width > self.0 || width > w {
break
}
if let Tui::Draw(..) = to {
to.set_char(x + width - 1, y, c);
}
width += c.width().unwrap_or(0) as u16;
}
let XYWH(x, y, w, ..) = XYWH(
to.x(), to.y(), to.w().min(self.0).min(self.1.as_ref().width() as u16), to.h()
);
to.text(&self.as_ref(), x, y, w)
}
}
fn layout_text_u16 (text: &str, area: XYWH<u16>) -> Perhaps<XYWH<u16>> {
let XYWH(x, y, w, h) = area;
let mut max_w = 0u16;
let mut max_h = 0u16;
for line in text.split("\n") {
max_h += 1;
max_w = max_w.max(line.len() as u16);
}
Ok(Some(XYWH(x, y, w.min(max_w), h.min(max_h))))
}
#[cfg(test)] #[test] fn test_layout_text_u16 () -> Usually<()> {
assert_eq!(layout_text_u16("foo", XYWH(5, 6, 10, 10))?, Some(XYWH(5, 6, 3, 1))); assert_eq!(layout_text_u16("foo", XYWH(5, 6, 10, 10))?, Some(XYWH(5, 6, 3, 1)));
assert_eq!(layout_text_u16("foo\nbarz", XYWH(5, 6, 10, 10))?, Some(XYWH(5, 6, 4, 2))); assert_eq!(layout_text_u16("foo\nbarz", XYWH(5, 6, 10, 10))?, Some(XYWH(5, 6, 4, 2)));
Ok(()) Ok(())
}
} }

36
src/term/modify.rs
View file

@ -65,35 +65,41 @@ impl Tui {
/// Apply foreground color. /// Apply foreground color.
pub const fn fg (fg: Color, item: impl Draw<Tui>) -> impl Draw<Tui> { pub const fn fg (fg: Color, item: impl Draw<Tui>) -> impl Draw<Tui> {
draw(move|to: &mut Tui|{ draw(move|to: &mut Tui|{
if let Some(size) = to.size(None, &item)? {
to.draw(Some(size), draw(|to: &mut Tui|{
to.update(&|cell,_,_|{ cell.set_fg(fg); }); to.update(&|cell,_,_|{ cell.set_fg(fg); });
item.draw(to) item.draw(to)
}))
} else {
Ok(None)
}
}) })
} }
/// Apply background color. /// Apply background color.
pub const fn bg (bg: Color, item: impl Draw<Tui>) -> impl Draw<Tui> { pub const fn bg (bg: Color, item: impl Draw<Tui>) -> impl Draw<Tui> {
Background(bg, item) draw(move|to: &mut Tui|{
} if let Some(size) = to.size(None, &item)? {
let _ = to.draw(Some(size), draw(|to: &mut Tui|{
pub struct Background<T>(Color, T); Ok(Some(to.update(&|cell,_,_|{ cell.set_bg(bg); })))
}))?;
impl<T: Draw<Tui>> Draw<Tui> for Background<T> { to.draw(Some(size), &item)
fn draw (&self, to: &mut Tui) -> Drawn<u16> {
if let Some(size) = to.size(None, &self.1)? {
to.draw(Some(size), draw(|to: &mut Tui|{
to.update(&|cell,_,_|{ cell.set_bg(self.0); });
self.1.draw(to)
}))
} else { } else {
Ok(None) Ok(None)
} }
} })
} }
pub const fn fg_bg (fg: Color, bg: Color, item: impl Draw<Tui>) -> impl Draw<Tui> { pub const fn fg_bg (fg: Color, bg: Color, item: impl Draw<Tui>) -> impl Draw<Tui> {
draw(move|to: &mut Tui|{ draw(move|to: &mut Tui|{
to.update(&|cell,_,_|{ cell.set_fg(fg); cell.set_bg(bg); }); if let Some(size) = to.size(None, &item)? {
item.draw(to) let _ = to.draw(Some(size), draw(|to: &mut Tui|{
Ok(Some(to.update(&|cell,_,_|{ cell.set_fg(fg); cell.set_bg(bg); })))
}))?;
to.draw(Some(size), &item)
} else {
Ok(None)
}
}) })
} }