tawasuyu/taffy

1#[test]
2fn flex_shrink_to_zero() {
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            flex_shrink: 0f32,
10            size: taffy::geometry::Size {
11                width: taffy::style::Dimension::Points(50f32),
12                height: taffy::style::Dimension::Points(50f32),
13            },
14            ..Default::default()
15        })
16        .unwrap();
17    let node1 = taffy
18        .new_leaf(taffy::style::Style {
19            flex_shrink: 1f32,
20            size: taffy::geometry::Size {
21                width: taffy::style::Dimension::Points(50f32),
22                height: taffy::style::Dimension::Points(50f32),
23            },
24            ..Default::default()
25        })
26        .unwrap();
27    let node2 = taffy
28        .new_leaf(taffy::style::Style {
29            flex_shrink: 0f32,
30            size: taffy::geometry::Size {
31                width: taffy::style::Dimension::Points(50f32),
32                height: taffy::style::Dimension::Points(50f32),
33            },
34            ..Default::default()
35        })
36        .unwrap();
37    let node = taffy
38        .new_with_children(
39            taffy::style::Style {
40                size: taffy::geometry::Size { width: taffy::style::Dimension::Points(75f32), height: auto() },
41                ..Default::default()
42            },
43            &[node0, node1, node2],
44        )
45        .unwrap();
46    taffy.compute_layout(node, taffy::geometry::Size::MAX_CONTENT).unwrap();
47    println!("\nComputed tree:");
48    taffy::debug::print_tree(&taffy, node);
49    println!();
50    let Layout { size, location, .. } = taffy.layout(node).unwrap();
51    assert_eq!(size.width, 75f32, "width of node {:?}. Expected {}. Actual {}", node.data(), 75f32, size.width);
52    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node.data(), 50f32, size.height);
53    assert_eq!(location.x, 0f32, "x of node {:?}. Expected {}. Actual {}", node.data(), 0f32, location.x);
54    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node.data(), 0f32, location.y);
55    let Layout { size, location, .. } = taffy.layout(node0).unwrap();
56    assert_eq!(size.width, 50f32, "width of node {:?}. Expected {}. Actual {}", node0.data(), 50f32, size.width);
57    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node0.data(), 50f32, size.height);
58    assert_eq!(location.x, 0f32, "x of node {:?}. Expected {}. Actual {}", node0.data(), 0f32, location.x);
59    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node0.data(), 0f32, location.y);
60    let Layout { size, location, .. } = taffy.layout(node1).unwrap();
61    assert_eq!(size.width, 0f32, "width of node {:?}. Expected {}. Actual {}", node1.data(), 0f32, size.width);
62    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node1.data(), 50f32, size.height);
63    assert_eq!(location.x, 50f32, "x of node {:?}. Expected {}. Actual {}", node1.data(), 50f32, location.x);
64    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node1.data(), 0f32, location.y);
65    let Layout { size, location, .. } = taffy.layout(node2).unwrap();
66    assert_eq!(size.width, 50f32, "width of node {:?}. Expected {}. Actual {}", node2.data(), 50f32, size.width);
67    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node2.data(), 50f32, size.height);
68    assert_eq!(location.x, 50f32, "x of node {:?}. Expected {}. Actual {}", node2.data(), 50f32, location.x);
69    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node2.data(), 0f32, location.y);
70}