tawasuyu/taffy

1#[test]
2fn measure_child_with_flex_grow() {
3    use slotmap::Key;
4    #[allow(unused_imports)]
5    use taffy::{layout::Layout, prelude::*};
6    let mut taffy = taffy::Taffy::new();
7    let node0 = taffy
8        .new_leaf(taffy::style::Style {
9            size: taffy::geometry::Size {
10                width: taffy::style::Dimension::Points(50f32),
11                height: taffy::style::Dimension::Points(50f32),
12            },
13            ..Default::default()
14        })
15        .unwrap();
16    let node1 = taffy
17        .new_leaf_with_measure(
18            taffy::style::Style { ..Default::default() },
19            taffy::node::MeasureFunc::Raw(|known_dimensions, available_space| {
20                const TEXT: &str = "H\u{200b}H\u{200b}H\u{200b}H\u{200b}H";
21                super::measure_standard_text(
22                    known_dimensions,
23                    available_space,
24                    TEXT,
25                    super::WritingMode::Horizontal,
26                    None,
27                )
28            }),
29        )
30        .unwrap();
31    let node = taffy
32        .new_with_children(
33            taffy::style::Style {
34                size: taffy::geometry::Size {
35                    width: taffy::style::Dimension::Points(100f32),
36                    height: taffy::style::Dimension::Auto,
37                },
38                ..Default::default()
39            },
40            &[node0, node1],
41        )
42        .unwrap();
43    taffy.compute_layout(node, taffy::geometry::Size::MAX_CONTENT).unwrap();
44    println!("\nComputed tree:");
45    taffy::debug::print_tree(&taffy, node);
46    println!();
47    let Layout { size, location, .. } = taffy.layout(node).unwrap();
48    assert_eq!(size.width, 100f32, "width of node {:?}. Expected {}. Actual {}", node.data(), 100f32, size.width);
49    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node.data(), 50f32, size.height);
50    assert_eq!(location.x, 0f32, "x of node {:?}. Expected {}. Actual {}", node.data(), 0f32, location.x);
51    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node.data(), 0f32, location.y);
52    let Layout { size, location, .. } = taffy.layout(node0).unwrap();
53    assert_eq!(size.width, 50f32, "width of node {:?}. Expected {}. Actual {}", node0.data(), 50f32, size.width);
54    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node0.data(), 50f32, size.height);
55    assert_eq!(location.x, 0f32, "x of node {:?}. Expected {}. Actual {}", node0.data(), 0f32, location.x);
56    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node0.data(), 0f32, location.y);
57    let Layout { size, location, .. } = taffy.layout(node1).unwrap();
58    assert_eq!(size.width, 50f32, "width of node {:?}. Expected {}. Actual {}", node1.data(), 50f32, size.width);
59    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node1.data(), 50f32, size.height);
60    assert_eq!(location.x, 50f32, "x of node {:?}. Expected {}. Actual {}", node1.data(), 50f32, location.x);
61    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node1.data(), 0f32, location.y);
62}