sized spans!

src/core/span.rs

@@ -7,7 +7,7 @@ pub struct Span {
 
 impl Widget for Span {
     fn draw(&mut self, painter: &mut Painter) {
-        let total = self.setup(painter);
+        let total = self.setup(&mut painter.size_ctx());
         let mut start = UIScalar::min();
         for (child, length) in &self.children {
             let mut child_region = UiRegion::full();
@@ -44,6 +44,17 @@ impl Widget for Span {
             painter.draw_within(child, child_region);
         }
     }
+
+    fn size(&mut self, ctx: &mut SizeCtx) -> Vec2 {
+        let total = self.setup(ctx);
+        let axis = self.dir.axis;
+        let dir_len = if total.ratio != 0.0 {
+            ctx.size.axis(axis)
+        } else {
+            total.fixed + total.relative * ctx.screen_size.axis(axis)
+        };
+        Vec2::from_axis(axis, dir_len, total.max_sized)
+    }
 }
 
 #[derive(Default)]
@@ -51,6 +62,7 @@ pub struct SpanLenSums {
     pub fixed: f32,
     pub ratio: f32,
     pub relative: f32,
+    pub max_sized: f32,
 }
 
 impl Span {
@@ -61,7 +73,7 @@ impl Span {
         }
     }
 
-    fn setup(&mut self, painter: &mut Painter) -> SpanLenSums {
+    fn setup(&mut self, ctx: &mut SizeCtx) -> SpanLenSums {
         self.children
             .iter_mut()
             .fold(SpanLenSums::default(), |mut s, (id, l)| {
@@ -70,8 +82,9 @@ impl Span {
                     SpanLen::Ratio(v) => s.ratio += *v,
                     SpanLen::Relative(v) => s.relative += *v,
                     SpanLen::Sized(v) => {
-                        let size = painter.size(id);
+                        let size = ctx.size(id);
                         let len = size.axis(self.dir.axis);
+                        s.max_sized = s.max_sized.max(size.axis(!self.dir.axis));
                         *v = size;
                         s.fixed += len;
                     }