tawasuyu/taffy

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