Abstraction for fr resolving

src/geom/fr.rs

@@ -34,6 +34,16 @@ impl Fractional {
     pub fn abs(self) -> Self {
         Self::new(self.get().abs())
     }
+
+    /// Resolve this fractionals share in the remaining space.
+    pub fn resolve(self, total: Self, remaining: Length) -> Length {
+        let ratio = self / total;
+        if ratio.is_finite() && remaining.is_finite() {
+            ratio * remaining
+        } else {
+            Length::zero()
+        }
+    }
 }
 
 impl Debug for Fractional {

src/library/flow.rs

@@ -179,7 +179,7 @@ impl<'a> FlowLayouter<'a> {
         // the region expands.
         let size = Size::new(
             if self.expand.x { self.full.w } else { self.used.w },
-            if self.expand.y || (!self.fr.is_zero() && self.full.h.is_finite()) {
+            if self.expand.y || (self.fr.get() > 0.0 && self.full.h.is_finite()) {
                 self.full.h
             } else {
                 self.used.h
@@ -196,11 +196,8 @@ impl<'a> FlowLayouter<'a> {
             match item {
                 FlowItem::Absolute(v) => before += v,
                 FlowItem::Fractional(v) => {
-                    let ratio = v / self.fr;
                     let remaining = self.full.h - self.used.h;
-                    if remaining.is_finite() && ratio.is_finite() {
-                        before += ratio * remaining;
-                    }
+                    before += v.resolve(self.fr, remaining);
                 }
                 FlowItem::Frame(frame, align) => {
                     ruler = ruler.max(align);

src/library/grid.rs

@@ -314,10 +314,7 @@ impl<'a> GridLayouter<'a> {
     fn grow_fractional_columns(&mut self, remaining: Length, fr: Fractional) {
         for (&col, rcol) in self.cols.iter().zip(&mut self.rcols) {
             if let TrackSizing::Fractional(v) = col {
-                let ratio = v / fr;
-                if ratio.is_finite() {
-                    *rcol = ratio * remaining;
-                }
+                *rcol = v.resolve(fr, remaining);
             }
         }
     }
@@ -547,7 +544,7 @@ impl<'a> GridLayouter<'a> {
         // Determine the size of the grid in this region, expanding fully if
         // there are fr rows.
         let mut size = self.used;
-        if !self.fr.is_zero() && self.full.is_finite() {
+        if self.fr.get() > 0.0 && self.full.is_finite() {
             size.h = self.full;
             self.cts.exact.y = Some(self.full);
         } else {
@@ -563,14 +560,9 @@ impl<'a> GridLayouter<'a> {
             let frame = match row {
                 Row::Frame(frame) => frame,
                 Row::Fr(v, y) => {
-                    let ratio = v / self.fr;
                     let remaining = self.full - self.used.h;
-                    if remaining.is_finite() && ratio.is_finite() {
-                        let resolved = ratio * remaining;
-                        self.layout_single_row(ctx, resolved, y)
-                    } else {
-                        continue;
-                    }
+                    let height = v.resolve(self.fr, remaining);
+                    self.layout_single_row(ctx, height, y)
                 }
             };
 

src/library/par.rs

@@ -498,12 +498,7 @@ impl<'a> LineLayout<'a> {
 
             match *item {
                 ParItem::Absolute(v) => offset += v,
-                ParItem::Fractional(v) => {
-                    let ratio = v / self.fr;
-                    if remaining.is_finite() && ratio.is_finite() {
-                        offset += ratio * remaining;
-                    }
-                }
+                ParItem::Fractional(v) => offset += v.resolve(self.fr, remaining),
                 ParItem::Text(ref shaped, align) => position(shaped.build(), align),
                 ParItem::Frame(ref frame, align) => position(frame.clone(), align),
             }

src/library/shape.rs

@@ -147,7 +147,7 @@ impl Layout for ShapeNode {
         } else {
             let default = Length::pt(30.0);
             let size = Size::new(
-                if regions.expand.x && regions.current.w.is_finite() {
+                if regions.expand.x {
                     regions.current.w
                 } else {
                     match self.kind {
@@ -155,11 +155,7 @@ impl Layout for ShapeNode {
                         ShapeKind::Rect | ShapeKind::Ellipse => 1.5 * default,
                     }
                 },
-                if regions.expand.y && regions.current.h.is_finite() {
-                    regions.current.h
-                } else {
-                    default
-                },
+                if regions.expand.y { regions.current.h } else { default },
             );
 
             Frame::new(size, size.h)

src/library/stack.rs

@@ -204,7 +204,7 @@ impl<'a> StackLayouter<'a> {
 
         // Expand fully if there are fr spacings.
         let full = self.full.get(self.axis);
-        if !self.fr.is_zero() && full.is_finite() {
+        if self.fr.get() > 0.0 && full.is_finite() {
             size.set(self.axis, full);
         }
 
@@ -216,11 +216,8 @@ impl<'a> StackLayouter<'a> {
             match item {
                 StackItem::Absolute(v) => before += v,
                 StackItem::Fractional(v) => {
-                    let ratio = v / self.fr;
                     let remaining = self.full.get(self.axis) - self.used.block;
-                    if remaining.is_finite() && ratio.is_finite() {
-                        before += ratio * remaining;
-                    }
+                    before += v.resolve(self.fr, remaining)
                 }
                 StackItem::Frame(frame) => {
                     let parent = size.get(self.axis);