use super::*;
use crate::ValidationErrorKind;
use crate::{
Color, DrawCommand, NodeModifiers, Pivot, PixelSize, Point, Rect, Size, ValidationLimits,
};
fn item(width: f64, height: f64) -> Node {
Node::from(Rect::new(0.0, 0.0, width, height).fill(Color::WHITE))
}
#[test]
fn real_baselines_align_in_measurement_and_compilation() -> crate::Result {
struct TextTile(f64, f64, f64);
impl crate::Drawable for TextTile {
fn bounds(&self, _: &crate::DrawContext) -> Rect {
Rect::new(0.0, 0.0, self.0, self.1)
}
fn baseline(&self, _: &crate::DrawContext) -> Option<f64> {
Some(self.2)
}
fn draw(
&self,
context: &crate::DrawContext,
canvas: &mut crate::Canvas<'_>,
) -> Result<(), ValidationError> {
canvas.fill(
&self.bounds(context),
crate::Color::WHITE,
crate::FillRule::NonZero,
)
}
}
let row = Row::new().alignment(Alignment::Baseline).children([
Node::from(TextTile(10.0, 10.0, 8.0)).translate(100.0, 50.0),
Node::from(TextTile(5.0, 5.0, 3.0)).scale(2.0),
]);
assert_eq!(
row.measure(ValidationLimits::default())?,
Rect::new(0.0, 0.0, 20.0, 12.0)
);
let list = row.compile(
crate::Size::new(32.0, 32.0),
crate::PixelSize::new(32, 32),
ValidationLimits::default(),
)?;
let baselines: Vec<_> = list
.commands
.iter()
.zip([8.0, 3.0])
.map(|(command, baseline)| {
let crate::DrawCommand::FillRect { transform, .. } = command else {
panic!("rectangle");
};
transform.apply(Point::new(0.0, baseline)).y
})
.collect();
assert_eq!(baselines, [8.0, 8.0]);
for node in [
Node::from(TextTile(1.0, 1.0, f64::NAN)),
Node::from(TextTile(1.0, 1.0, 0.5)).rotate(0.2),
] {
assert!(
Row::new()
.alignment(Alignment::Baseline)
.children([node])
.measure(ValidationLimits::default())
.is_err()
);
}
Ok(())
}
fn origins(node: &Node) -> Vec<(f64, f64)> {
node.compile(
Size::new(640.0, 360.0),
PixelSize::new(640, 360),
ValidationLimits::default(),
)
.unwrap()
.commands
.iter()
.filter_map(|command| match command {
DrawCommand::FillRect { transform, .. } => {
let point = transform.apply(Point::ORIGIN);
Some((point.x, point.y))
}
_ => None,
})
.collect()
}
#[test]
fn rows_align_transformed_bounds_with_finite_gaps() {
for (alignment, first_y) in [
(Alignment::Start, 0.0),
(Alignment::Center, 10.0),
(Alignment::End, 20.0),
] {
let row = Row::new()
.gap(5.0)
.alignment(alignment)
.children([item(20.0, 20.0), item(5.0, 40.0)]);
assert_eq!(origins(&row), vec![(0.0, first_y), (25.0, 0.0)]);
assert_eq!(
row.measure(ValidationLimits::default()).unwrap(),
Rect::new(0.0, 0.0, 30.0, 40.0)
);
}
let shifted = Row::new().children([item(10.0, 20.0).translate(-8.0, 17.0)]);
assert_eq!(origins(&shifted), vec![(0.0, 0.0)]);
}
#[test]
fn columns_skip_empty_nodes_but_keep_declared_degenerate_geometry() {
for (alignment, first_x) in [
(Alignment::Start, 0.0),
(Alignment::Center, 10.0),
(Alignment::End, 20.0),
] {
let column = Column::new().gap(3.0).alignment(alignment).children([
Some(item(20.0, 10.0)),
None,
Some(item(40.0, 5.0)),
]);
assert_eq!(origins(&column), vec![(first_x, 0.0), (0.0, 13.0)]);
assert_eq!(
column.measure(ValidationLimits::default()).unwrap(),
Rect::new(0.0, 0.0, 40.0, 18.0)
);
}
let point = Column::new()
.gap(4.0)
.children([item(0.0, 0.0), item(2.0, 3.0)]);
assert_eq!(
point.measure(ValidationLimits::default()).unwrap(),
Rect::new(0.0, 0.0, 2.0, 7.0)
);
let empty = Row::new().children(Vec::<Node>::new());
assert_eq!(
empty.measure(ValidationLimits::default()).unwrap(),
Rect::default()
);
let overlap = Row::new()
.gap(-10.0)
.children([item(20.0, 10.0), item(5.0, 10.0)]);
assert_eq!(origins(&overlap), vec![(0.0, 0.0), (10.0, 0.0)]);
assert_eq!(
overlap.measure(ValidationLimits::default()).unwrap().right,
20.0
);
}
#[test]
fn insertion_order_controls_layout_while_z_order_controls_painting() {
let row = Row::new()
.gap(5.0)
.children([item(10.0, 10.0).z_index(2), item(20.0, 20.0).z_index(-1)]);
assert_eq!(origins(&row), vec![(15.0, 0.0), (0.0, 0.0)]);
let placed = row
.pivot(Pivot::TopLeft)
.at(Point::new(50.0, 60.0))
.scale(2.0)
.opacity(0.0);
assert_eq!(
placed.measure(ValidationLimits::default()).unwrap(),
Rect::new(50.0, 60.0, 120.0, 100.0)
);
let scene = placed
.compile(
Size::new(640.0, 360.0),
PixelSize::new(640, 360),
ValidationLimits::default(),
)
.unwrap();
assert!(matches!(
scene.commands[0],
DrawCommand::PushLayer { opacity: 0.0, .. }
));
}
#[test]
fn child_rotation_and_reflection_supply_arranged_aabb_sizes() {
let rotated = item(10.0, 20.0)
.pivot(Pivot::TopLeft)
.rotate(std::f64::consts::FRAC_PI_2);
let reflected = item(5.0, 30.0).pivot(Pivot::TopLeft).scale_xy(-2.0, 0.5);
let row = Row::new()
.gap(3.0)
.alignment(Alignment::Center)
.children([rotated, reflected]);
assert_eq!(
row.measure(ValidationLimits::default()).unwrap(),
Rect::new(0.0, 0.0, 33.0, 15.0)
);
assert_eq!(origins(&row), vec![(20.0, 2.5), (33.0, 0.0)]);
let equal_z = Row::new().children([item(10.0, 10.0).z_index(1), item(20.0, 20.0).z_index(1)]);
assert_eq!(origins(&equal_z), vec![(0.0, 0.0), (10.0, 0.0)]);
}
#[test]
fn unsupported_and_unrepresentable_layouts_fail_without_silent_fallbacks() {
let limits = ValidationLimits::default();
for gap in [f64::NAN, f64::INFINITY, f64::NEG_INFINITY] {
assert_eq!(
Row::new()
.gap(gap)
.children([item(1.0, 1.0)])
.measure(limits)
.unwrap_err()
.field,
"gap"
);
}
for node in [
Row::new()
.alignment(Alignment::Baseline)
.children([item(1.0, 1.0)]),
Column::new()
.alignment(Alignment::Baseline)
.children([item(1.0, 1.0)]),
] {
assert_eq!(
node.measure(limits).unwrap_err().kind,
ValidationErrorKind::Unsupported
);
assert!(
node.opacity(0.0)
.compile(Size::new(8.0, 8.0), PixelSize::new(8, 8), limits)
.is_err()
);
}
let wide = Node::from(Rect::new(-f64::MAX, 0.0, f64::MAX, 1.0).fill(Color::WHITE));
assert_eq!(
Row::new()
.children([wide])
.measure(limits)
.unwrap_err()
.field,
"bounds"
);
let overflow =
Row::new()
.gap(f64::MAX)
.children([item(1.0, 1.0), item(1.0, 1.0), item(1.0, 1.0)]);
assert!(overflow.measure(limits).is_err());
}
#[test]
fn nested_layout_uses_one_structure_budget_and_preserves_input_snapshots() {
let child = item(10.0, 10.0).translate(3.0, 7.0);
let nested = Column::new().gap(2.0).children([
Row::new()
.gap(1.0)
.children([child.clone(), item(20.0, 5.0)]),
Row::new().children([item(4.0, 8.0)]),
]);
assert_eq!(
nested.measure(ValidationLimits::default()).unwrap(),
Rect::new(0.0, 0.0, 31.0, 20.0)
);
assert_eq!(
child.measure(ValidationLimits::default()).unwrap(),
Rect::new(3.0, 7.0, 13.0, 17.0)
);
let exact = ValidationLimits {
max_nodes: 6,
max_depth: 3,
};
assert!(nested.measure(exact).is_ok());
let draw_limits = ValidationLimits {
max_nodes: 9,
max_depth: 4,
};
assert!(
nested
.compile(Size::new(64.0, 64.0), PixelSize::new(64, 64), draw_limits)
.is_ok()
);
assert!(
nested
.compile(
Size::new(64.0, 64.0),
PixelSize::new(64, 64),
ValidationLimits {
max_nodes: 8,
..draw_limits
}
)
.is_err()
);
assert_eq!(
nested
.measure(ValidationLimits {
max_nodes: 5,
..exact
})
.unwrap_err()
.field,
"max_nodes"
);
assert_eq!(
nested
.measure(ValidationLimits {
max_depth: 2,
..exact
})
.unwrap_err()
.field,
"max_depth"
);
}