fission-layout 0.1.0

Layout
Documentation 
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use fission_ir::{FlexDirection as IrFlexDirection, LayoutOp as IrLayoutOp, NodeId, FlexWrap};
use fission_layout::{LayoutEngine, LayoutInputNode, LayoutSize};
use std::collections::HashSet;

fn make_box(id: u128, width: Option<f32>, height: Option<f32>) -> LayoutInputNode {
    LayoutInputNode {
        id: NodeId::from_u128(id),
        parent_id: None,
        op: IrLayoutOp::Box {
            width, height,
            min_width: None, max_width: None, min_height: None, max_height: None,
            padding: [0.0; 4],
            flex_grow: 0.0, flex_shrink: 0.0, aspect_ratio: None,
        },
        children_ids: vec![],
        debug_name: "box".into(),
        width, height, flex_grow: 0.0, flex_shrink: 0.0, rich_text: None,
    }
}

#[test]
fn test_box_default_stretch() {
    // A Container (Box) with default settings should stretch its children?
    // Box uses Display::Flex.
    // If we changed default alignment to Stretch, children should fill cross-axis.
    
    let mut engine = LayoutEngine::new();
    let root_id = NodeId::from_u128(1);
    let child_id = NodeId::from_u128(2);
    
    let root = LayoutInputNode {
        id: root_id,
        parent_id: None,
        op: IrLayoutOp::Box {
            width: Some(100.0), height: Some(100.0),
            min_width: None, max_width: None, min_height: None, max_height: None,
            padding: [0.0; 4],
            flex_grow: 0.0, flex_shrink: 0.0, aspect_ratio: None,
        },
        children_ids: vec![child_id],
        debug_name: "root".into(),
        width: Some(100.0), height: Some(100.0), flex_grow: 0.0, flex_shrink: 0.0, rich_text: None,
    };
    
    let child = LayoutInputNode {
        id: child_id,
        parent_id: Some(root_id),
        op: IrLayoutOp::Box {
            width: None, height: Some(50.0), // Fixed height, Auto width
            min_width: None, max_width: None, min_height: None, max_height: None,
            padding: [0.0; 4],
            flex_grow: 0.0, flex_shrink: 0.0, aspect_ratio: None,
        },
        children_ids: vec![],
        debug_name: "child".into(),
        width: None, height: Some(50.0), flex_grow: 0.0, flex_shrink: 0.0, rich_text: None,
    };
    
    let nodes = vec![root, child];
    let dirty: HashSet<_> = nodes.iter().map(|n| n.id).collect();
    engine.update(&nodes, &dirty);
    
    let snap = engine.compute_layout(&nodes, root_id, LayoutSize::new(1000.0, 1000.0), &|_| 0.0).unwrap();
    
    let child_geom = snap.get_node_geometry(child_id).unwrap();
    
    // With AlignItems::Stretch (new default), child width should stretch to parent width (100.0).
    // Previous default (Center) would have made width 0.0 (intrinsic).
    assert_eq!(child_geom.rect.width(), 100.0, "Box child should stretch width by default");
    assert_eq!(child_geom.rect.height(), 50.0, "Box child should keep fixed height");
}