59 lines
1.6 KiB
Rust
59 lines
1.6 KiB
Rust
use serde::{Deserialize, Serialize};
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use crate::ids::SurfaceId;
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/// Split orientation. `H` lays children left-to-right; `V` top-to-bottom.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
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#[serde(rename_all = "lowercase")]
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pub enum Orient {
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H,
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V,
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}
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/// Recursive n-ary layout tree. Externally tagged so JSON reads
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/// `{ "leaf": { "surface_id": "s_1" } }` / `{ "split": { ... } }`.
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#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
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#[serde(rename_all = "snake_case")]
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pub enum LayoutNode {
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Leaf { surface_id: SurfaceId },
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Split {
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orient: Orient,
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ratios: Vec<f32>,
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children: Vec<LayoutNode>,
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},
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}
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impl LayoutNode {
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pub fn leaf(id: SurfaceId) -> Self {
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LayoutNode::Leaf { surface_id: id }
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn leaf_serializes_externally_tagged() {
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let n = LayoutNode::leaf(SurfaceId("s_1".into()));
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let j = serde_json::to_string(&n).unwrap();
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assert_eq!(j, r#"{"leaf":{"surface_id":"s_1"}}"#);
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}
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#[test]
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fn split_round_trips() {
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let n = LayoutNode::Split {
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orient: Orient::V,
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ratios: vec![0.5, 0.5],
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children: vec![
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LayoutNode::leaf(SurfaceId("s_1".into())),
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LayoutNode::leaf(SurfaceId("s_2".into())),
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],
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};
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let j = serde_json::to_string(&n).unwrap();
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assert!(j.contains(r#""split""#));
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assert!(j.contains(r#""orient":"v""#));
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let back: LayoutNode = serde_json::from_str(&j).unwrap();
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assert_eq!(back, n);
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}
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}
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