wip lazy layout

packages/tui/tests/relayout.rs

@@ -0,0 +1,63 @@
+use stretch2 as stretch;
+
+#[test]
+fn relayout() {
+    let mut stretch = stretch::Stretch::new();
+    let node1 = stretch
+        .new_node(
+            stretch::style::Style {
+                position: stretch::geometry::Point {
+                    x: stretch::style::Dimension::Points(10f32),
+                    y: stretch::style::Dimension::Points(10f32),
+                },
+                size: stretch::geometry::Size {
+                    width: stretch::style::Dimension::Points(10f32),
+                    height: stretch::style::Dimension::Points(10f32),
+                },
+                ..Default::default()
+            },
+            &[],
+        )
+        .unwrap();
+    let node0 = stretch
+        .new_node(
+            stretch::style::Style {
+                size: stretch::geometry::Size {
+                    width: stretch::style::Dimension::Percent(1f32),
+                    height: stretch::style::Dimension::Percent(1f32),
+                },
+                ..Default::default()
+            },
+            &[node1],
+        )
+        .unwrap();
+    let node = stretch
+        .new_node(
+            stretch::style::Style {
+                size: stretch::geometry::Size {
+                    width: stretch::style::Dimension::Points(100f32),
+                    height: stretch::style::Dimension::Points(100f32),
+                },
+                ..Default::default()
+            },
+            &[node0],
+        )
+        .unwrap();
+    for _ in 0..10 {
+        stretch
+            .compute_layout(node, stretch::geometry::Size::undefined())
+            .unwrap();
+        assert_eq!(stretch.layout(node).unwrap().size.width, 100f32);
+        assert_eq!(stretch.layout(node).unwrap().size.height, 100f32);
+        assert_eq!(stretch.layout(node).unwrap().location.x, 0f32);
+        assert_eq!(stretch.layout(node).unwrap().location.y, 0f32);
+        assert_eq!(stretch.layout(node1).unwrap().size.width, 10f32);
+        assert_eq!(stretch.layout(node1).unwrap().size.height, 10f32);
+        assert_eq!(stretch.layout(node1).unwrap().location.x, 0f32);
+        assert_eq!(stretch.layout(node1).unwrap().location.y, 0f32);
+        assert_eq!(stretch.layout(node0).unwrap().size.width, 100f32);
+        assert_eq!(stretch.layout(node0).unwrap().size.height, 100f32);
+        assert_eq!(stretch.layout(node0).unwrap().location.x, 0f32);
+        assert_eq!(stretch.layout(node0).unwrap().location.y, 0f32);
+    }
+}