Refactor alignments & directions 📐

- Adds lang function
- Refactors execution context
- Adds StackChild and ParChild enums

7 files changed, 15 insertions, 27 deletions

diff --git a/src/geom/align.rs b/src/geom/align.rs
index e13da378..422624d8 100644
--- a/src/geom/align.rs
+++ b/src/geom/align.rs
@@ -1,8 +1,5 @@
 use super::*;
 
-/// The alignments of a layout in its parent.
-pub type LayoutAligns = Gen<Align>;
-
 /// Where to align something along a directed axis.
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
 pub enum Align {
diff --git a/src/geom/dir.rs b/src/geom/dir.rs
index 3eddd7d3..cfcb4c09 100644
--- a/src/geom/dir.rs
+++ b/src/geom/dir.rs
@@ -1,8 +1,5 @@
 use super::*;
 
-/// The directions along which layouts are placed in their parent.
-pub type LayoutDirs = Gen<Dir>;
-
 /// The four directions into which content can be laid out.
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub enum Dir {
diff --git a/src/geom/gen.rs b/src/geom/gen.rs
index c80cc21b..7e021412 100644
--- a/src/geom/gen.rs
+++ b/src/geom/gen.rs
@@ -50,8 +50,8 @@ impl<T> Get<GenAxis> for Gen<T> {
 impl<T> Switch for Gen<T> {
     type Other = Spec<T>;
 
-    fn switch(self, dirs: LayoutDirs) -> Self::Other {
-        match dirs.main.axis() {
+    fn switch(self, main: SpecAxis) -> Self::Other {
+        match main {
             SpecAxis::Horizontal => Spec::new(self.main, self.cross),
             SpecAxis::Vertical => Spec::new(self.cross, self.main),
         }
@@ -86,10 +86,10 @@ impl GenAxis {
 impl Switch for GenAxis {
     type Other = SpecAxis;
 
-    fn switch(self, dirs: LayoutDirs) -> Self::Other {
+    fn switch(self, main: SpecAxis) -> Self::Other {
         match self {
-            Self::Main => dirs.main.axis(),
-            Self::Cross => dirs.cross.axis(),
+            Self::Main => main,
+            Self::Cross => main.other(),
         }
     }
 }
diff --git a/src/geom/mod.rs b/src/geom/mod.rs
index 5099c6b0..0031c6df 100644
--- a/src/geom/mod.rs
+++ b/src/geom/mod.rs
@@ -53,7 +53,6 @@ pub trait Switch {
     /// The type of the other version.
     type Other;
 
-    /// The other version of this type based on the current layouting
-    /// directions.
-    fn switch(self, dirs: LayoutDirs) -> Self::Other;
+    /// The other version of this type based on the current main axis.
+    fn switch(self, main: SpecAxis) -> Self::Other;
 }
diff --git a/src/geom/point.rs b/src/geom/point.rs
index cf8bc1a9..29298565 100644
--- a/src/geom/point.rs
+++ b/src/geom/point.rs
@@ -45,8 +45,8 @@ impl Get<SpecAxis> for Point {
 impl Switch for Point {
     type Other = Gen<Length>;
 
-    fn switch(self, dirs: LayoutDirs) -> Self::Other {
-        match dirs.main.axis() {
+    fn switch(self, main: SpecAxis) -> Self::Other {
+        match main {
             SpecAxis::Horizontal => Gen::new(self.x, self.y),
             SpecAxis::Vertical => Gen::new(self.y, self.x),
         }
diff --git a/src/geom/size.rs b/src/geom/size.rs
index 2feaa950..1ba2f04b 100644
--- a/src/geom/size.rs
+++ b/src/geom/size.rs
@@ -74,8 +74,8 @@ impl Get<SpecAxis> for Size {
 impl Switch for Size {
     type Other = Gen<Length>;
 
-    fn switch(self, dirs: LayoutDirs) -> Self::Other {
-        match dirs.main.axis() {
+    fn switch(self, main: SpecAxis) -> Self::Other {
+        match main {
             SpecAxis::Horizontal => Gen::new(self.width, self.height),
             SpecAxis::Vertical => Gen::new(self.height, self.width),
         }
diff --git a/src/geom/spec.rs b/src/geom/spec.rs
index 510bac84..546eac7b 100644
--- a/src/geom/spec.rs
+++ b/src/geom/spec.rs
@@ -66,8 +66,8 @@ impl<T> Get<SpecAxis> for Spec<T> {
 impl<T> Switch for Spec<T> {
     type Other = Gen<T>;
 
-    fn switch(self, dirs: LayoutDirs) -> Self::Other {
-        match dirs.main.axis() {
+    fn switch(self, main: SpecAxis) -> Self::Other {
+        match main {
             SpecAxis::Horizontal => Gen::new(self.horizontal, self.vertical),
             SpecAxis::Vertical => Gen::new(self.vertical, self.horizontal),
         }
@@ -102,13 +102,8 @@ impl SpecAxis {
 impl Switch for SpecAxis {
     type Other = GenAxis;
 
-    fn switch(self, dirs: LayoutDirs) -> Self::Other {
-        if self == dirs.main.axis() {
-            GenAxis::Main
-        } else {
-            debug_assert_eq!(self, dirs.cross.axis());
-            GenAxis::Cross
-        }
+    fn switch(self, main: SpecAxis) -> Self::Other {
+        if self == main { GenAxis::Main } else { GenAxis::Cross }
     }
 }