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(
23                    known_dimensions,
24                    available_space,
25                    TEXT,
26                    super::WritingMode::Horizontal,
27                    None,
28                )
29            }),
30        )
31        .unwrap();
32    let node = taffy
33        .new_with_children(
34            taffy::style::Style {
35                align_items: Some(taffy::style::AlignItems::Start),
36                size: taffy::geometry::Size {
37                    width: taffy::style::Dimension::Points(100f32),
38                    height: taffy::style::Dimension::Auto,
39                },
40                ..Default::default()
41            },
42            &[node0, node1],
43        )
44        .unwrap();
45    taffy.compute_layout(node, taffy::geometry::Size::MAX_CONTENT).unwrap();
46    println!("\nComputed tree:");
47    taffy::debug::print_tree(&taffy, node);
48    println!();
49    let Layout { size, location, .. } = taffy.layout(node).unwrap();
50    assert_eq!(size.width, 100f32, "width of node {:?}. Expected {}. Actual {}", node.data(), 100f32, size.width);
51    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node.data(), 50f32, size.height);
52    assert_eq!(location.x, 0f32, "x of node {:?}. Expected {}. Actual {}", node.data(), 0f32, location.x);
53    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node.data(), 0f32, location.y);
54    let Layout { size, location, .. } = taffy.layout(node0).unwrap();
55    assert_eq!(size.width, 50f32, "width of node {:?}. Expected {}. Actual {}", node0.data(), 50f32, size.width);
56    assert_eq!(size.height, 50f32, "height of node {:?}. Expected {}. Actual {}", node0.data(), 50f32, size.height);
57    assert_eq!(location.x, 0f32, "x of node {:?}. Expected {}. Actual {}", node0.data(), 0f32, location.x);
58    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node0.data(), 0f32, location.y);
59    let Layout { size, location, .. } = taffy.layout(node1).unwrap();
60    assert_eq!(size.width, 20f32, "width of node {:?}. Expected {}. Actual {}", node1.data(), 20f32, size.width);
61    assert_eq!(size.height, 10f32, "height of node {:?}. Expected {}. Actual {}", node1.data(), 10f32, size.height);
62    assert_eq!(location.x, 50f32, "x of node {:?}. Expected {}. Actual {}", node1.data(), 50f32, location.x);
63    assert_eq!(location.y, 0f32, "y of node {:?}. Expected {}. Actual {}", node1.data(), 0f32, location.y);
64}