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https://github.com/storytold/figcraft.git
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96 lines
3.8 KiB
Rust
96 lines
3.8 KiB
Rust
//! Deeply nested layers and a resize (#210): constraints, group scaling and auto layout fill
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//! follow a resize down to [`MAX_NESTING`] levels and stop there, instead of running out of stack.
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//! Each case runs on a 1 MB stack, the main thread's on Windows; thousands of levels overflowed it.
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use super::*;
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use figcraft_doc::{AutoLayout, Constraints, Document, HConstraint, NodeKind, VConstraint};
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/// Far deeper than the nesting the layout follows.
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const DEEP: usize = 5000;
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fn on_small_stack(f: impl FnOnce() + Send + 'static) {
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std::thread::Builder::new().stack_size(1 << 20).spawn(f).unwrap().join().unwrap();
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}
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fn width(d: &Document, id: NodeId) -> f64 {
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d.node(id).unwrap().width
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}
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/// A 100 × 100 frame holding `depth` frames, each inside the last and stretching with it; the
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/// root and the chain from the top.
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fn stretching_frames(depth: usize) -> (Document, NodeId, Vec<NodeId>) {
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let mut d = Document::new("deep");
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let page = d.first_page().unwrap();
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let root = d.create(page, NodeKind::Frame, "F", 0.0, 0.0, 100.0, 100.0).unwrap();
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let mut chain = Vec::new();
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let mut parent = root;
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for _ in 0..depth {
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let f = d.create(parent, NodeKind::Frame, "F", 0.0, 0.0, 100.0, 100.0).unwrap();
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d.get_mut(f).unwrap().constraints = Constraints { horizontal: HConstraint::LeftRight, vertical: VConstraint::TopBottom };
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chain.push(f);
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parent = f;
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}
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(d, root, chain)
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}
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#[test]
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fn deeply_nested_frames_follow_their_constraints_without_running_out_of_stack() {
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on_small_stack(|| {
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let (mut d, root, chain) = stretching_frames(DEEP);
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set_size(&mut d, root, 200.0, 200.0);
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apply_constraints(&mut d, root, 100.0, 100.0);
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assert_eq!(width(&d, chain[0]), 200.0);
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assert_eq!(width(&d, chain[MAX_NESTING - 2]), 200.0);
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assert_eq!(width(&d, chain[DEEP - 1]), 100.0, "past the nesting the layout follows, layers stay");
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});
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}
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#[test]
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fn a_shallow_chain_follows_all_the_way_down() {
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let (mut d, root, chain) = stretching_frames(20);
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set_size(&mut d, root, 200.0, 200.0);
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apply_constraints(&mut d, root, 100.0, 100.0);
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assert!(chain.iter().all(|f| width(&d, *f) == 200.0));
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}
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#[test]
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fn deeply_nested_groups_scale_without_running_out_of_stack() {
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on_small_stack(|| {
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let mut d = Document::new("deep");
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let mut parent = d.first_page().unwrap();
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let root = d.create(parent, NodeKind::Group, "G", 0.0, 0.0, 100.0, 100.0).unwrap();
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parent = root;
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let mut chain = Vec::new();
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for _ in 0..DEEP {
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parent = d.create(parent, NodeKind::Group, "G", 0.0, 0.0, 100.0, 100.0).unwrap();
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chain.push(parent);
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}
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scale_group_children(&mut d, root, 2.0, 2.0);
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assert_eq!(width(&d, chain[0]), 200.0);
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});
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}
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#[test]
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fn deeply_nested_fill_frames_lay_out_without_running_out_of_stack() {
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on_small_stack(|| {
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let mut d = Document::new("deep");
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let page = d.first_page().unwrap();
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let root = d.create(page, NodeKind::Frame, "F", 0.0, 0.0, 100.0, 100.0).unwrap();
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d.get_mut(root).unwrap().layout = Some(AutoLayout { padding: [0.0; 4], ..AutoLayout::default() });
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let mut parent = root;
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let mut chain = Vec::new();
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for _ in 0..DEEP {
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let f = d.create(parent, NodeKind::Frame, "F", 0.0, 0.0, 10.0, 10.0).unwrap();
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let n = d.get_mut(f).unwrap();
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n.layout = Some(AutoLayout { padding: [0.0; 4], ..AutoLayout::default() });
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n.child_layout.sizing_h = Sizing::Fill;
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chain.push(f);
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parent = f;
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}
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d.get_mut(root).unwrap().width = 300.0;
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layout_frame(&mut d, root, &NoMeasure);
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assert_eq!(width(&d, chain[0]), 300.0);
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assert_eq!(width(&d, chain[DEEP - 1]), 10.0, "past the nesting the layout follows, layers stay");
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});
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}
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