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wip: generic layout!

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🪞👃🪞 2024-09-06 21:52:23 +03:00
parent 0bbf74e915
commit 93ba611e33
11 changed files with 267 additions and 82 deletions
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100
crates/tek_core/src/engine/layout.rs Normal file
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use crate::*;
/// Compute drawing area before rendering
pub trait Layout<E: Engine> {
fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>>;
}
/// Enforce minimum size of drawing area
pub enum Min<U: Number, L> { W(U, L), H(U, L), WH(U, U, L), }
/// Enforce maximum size of drawing area
pub enum Max<U: Number, L> { W(U, L), H(U, L), WH(U, U, L), }
/// Expand drawing area
pub enum Outset<U: Number, L> { W(U, L), H(U, L), WH(U, U, L), }
/// Shrink drawing area
pub enum Inset<U: Number, L> { W(U, L), H(U, L), WH(U, U, L), }
/// Move origin point of drawing area
pub enum Offset<U: Number, L> { X(U, L), Y(U, L), XY(U, U, L), }
impl<E: Engine, L: Layout<E>> Layout<E> for Min<E:: Unit, L> {
fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
match self {
Self::W(w, item) => if area.w() < *w { Ok(None) } else {
// TODO: axis clamp (subtract from x if width goes out of area
item.layout([area.x(), area.y(), area.w().max(*w), area.h()])
},
Self::H(h, item) => if area.w() < *h { Ok(None) } else {
// TODO: axis clamp (subtract from x if width goes out of area
item.layout([area.x(), area.y(), area.w(), area.h().max(*h)])
},
Self::WH(w, h, item) => if area.w() < *w || area.h() < *h { Ok(None) } else {
item.layout([area.x(), area.y(), area.w().max(*w), area.h().max(*h)])
}
}
}
}
impl<E: Engine, L: Layout<E>> Layout<E> for Max<E:: Unit, L> {
fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
match self {
Self::W(w, item) => {
// TODO: axis clamp (subtract from x if width goes out of area
item.layout([area.x(), area.y(), area.w().min(*w), area.h()])
},
Self::H(h, item) => {
// TODO: axis clamp (subtract from x if width goes out of area
item.layout([area.x(), area.y(), area.w(), area.h().min(*h)])
},
Self::WH(w, h, item) => {
item.layout([area.x(), area.y(), area.w().min(*w), area.h().min(*h)])
}
}
}
}
impl<E: Engine, L: Layout<E>> Layout<E> for Outset<E::Unit, L> {
fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
match self {
Self::W(w, item) => if area.x() < *w { Ok(None) } else {
item.layout([area.x() - *w, area.y(), area.w() + *w, area.h()])
},
Self::H(h, item) => if area.y() < *h { Ok(None) } else {
item.layout([area.x(), area.y() - *h, area.w(), area.h() + *h])
},
Self::WH(w, h, item) => if area.x() < *w || area.y() < *h { Ok(None) } else {
item.layout([area.x()-*w, area.y() - *h, area.w() + *w, area.h() + *h])
}
}
}
}
impl<E: Engine, L: Layout<E>> Layout<E> for Inset<E::Unit, L> {
fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
match self {
Self::W(w, item) => if area.w() < *w { Ok(None) } else {
item.layout([area.x() + *w, area.y(), area.w() - *w, area.h()])
},
Self::H(h, item) => if area.h() < *h { Ok(None) } else {
item.layout([area.x(), area.y() + *h, area.w(), area.h() - *h])
},
Self::WH(w, h, item) => if area.w() < *w || area.h() < *h { Ok(None) } else {
item.layout([area.x() - *w, area.y() - *h, area.w() + *w, area.h() + *h])
}
}
}
}
impl<E: Engine, L: Layout<E>> Layout<E> for Offset<E::Unit, L> {
fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
match self {
Self::X(x, item) => if area.w() < *x { Ok(None) } else {
item.layout([area.x() + *x, area.y(), area.w() - *x, area.h()])
},
Self::Y(y, item) => if area.h() < *y { Ok(None) } else {
item.layout([area.x(), area.y() + *y, area.w(), area.h() - *y])
},
Self::XY(x, y, item) => if area.w() < *x || area.h() < *y { Ok(None) } else {
item.layout([area.x() + *x, area.y() + *y, area.w() - *x, area.h() - *y])
}
}
}
}