Switch back to custom geometry types, unified with layout primitives 🏞

1 files changed, 42 insertions, 0 deletions

diff --git a/src/layout/fixed.rs b/src/layout/fixed.rs
new file mode 100644
index 00000000..0d438879
--- /dev/null
+++ b/src/layout/fixed.rs
@@ -0,0 +1,42 @@
+use super::*;
+use crate::geom::Linear;
+
+/// A node that can fix its child's width and height.
+#[derive(Debug, Clone, PartialEq)]
+pub struct Fixed {
+    pub width: Option<Linear>,
+    pub height: Option<Linear>,
+    pub child: LayoutNode,
+}
+
+#[async_trait(?Send)]
+impl Layout for Fixed {
+    async fn layout(
+        &self,
+        ctx: &mut LayoutContext,
+        constraints: LayoutConstraints,
+    ) -> Vec<LayoutItem> {
+        let space = constraints.spaces[0];
+        let size = Size::new(
+            self.width
+                .map(|w| w.eval(space.base.width))
+                .unwrap_or(space.size.width),
+            self.height
+                .map(|h| h.eval(space.base.height))
+                .unwrap_or(space.size.height),
+        );
+
+        self.child
+            .layout(ctx, LayoutConstraints {
+                spaces: vec![LayoutSpace { base: size, size }],
+                repeat: false,
+            })
+            .await
+    }
+}
+
+impl From<Fixed> for LayoutNode {
+    fn from(fixed: Fixed) -> Self {
+        Self::dynamic(fixed)
+    }
+}