tawasuyu/taffy

1#[test]
2fn measure_remeasure_child_after_shrinking() {
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_with_measure(
19            taffy::style::Style { ..Default::default() },
20            taffy::node::MeasureFunc::Raw(|known_dimensions, available_space| {
21                const TEXT: &str = "HH";
22                super::measure_standard_text(known_dimensions, available_space, TEXT, super::WritingMode::Horizontal)
23            }),
24        )
25        .unwrap();
26    let node = taffy
27        .new_with_children(
28            taffy::style::Style {
29                align_items: Some(taffy::style::AlignItems::Start),
30                size: taffy::geometry::Size {
31                    width: taffy::style::Dimension::Points(100f32),
32                    height: taffy::style::Dimension::Auto,
33                },
34                ..Default::default()
35            },
36            &[node0, node1],
37        )
38        .unwrap();
39    taffy.compute_layout(node, taffy::geometry::Size::MAX_CONTENT).unwrap();
40    println!("\nComputed tree:");
41    taffy::debug::print_tree(&taffy, node);
42    println!();
43    let Layout { size, location, .. } = taffy.layout(node).unwrap();
44    assert_eq!(size.width, 100f32, "width of node {:?}. Expected {}. Actual {}", node.data(), 100f32, size.width);
45    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node.data(), 50f32, size.height);
46    assert_eq!(location.x, 0f32, "x of node {:?}. Expected {}. Actual {}", node.data(), 0f32, location.x);
47    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node.data(), 0f32, location.y);
48    let Layout { size, location, .. } = taffy.layout(node0).unwrap();
49    assert_eq!(size.width, 50f32, "width of node {:?}. Expected {}. Actual {}", node0.data(), 50f32, size.width);
50    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node0.data(), 50f32, size.height);
51    assert_eq!(location.x, 0f32, "x of node {:?}. Expected {}. Actual {}", node0.data(), 0f32, location.x);
52    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node0.data(), 0f32, location.y);
53    let Layout { size, location, .. } = taffy.layout(node1).unwrap();
54    assert_eq!(size.width, 20f32, "width of node {:?}. Expected {}. Actual {}", node1.data(), 20f32, size.width);
55    assert_eq!(size.height, 10f32, "height of node {:?}. Expected {}. Actual {}", node1.data(), 10f32, size.height);
56    assert_eq!(location.x, 50f32, "x of node {:?}. Expected {}. Actual {}", node1.data(), 50f32, location.x);
57    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node1.data(), 0f32, location.y);
58}