Guess I should put this under version control LOL

styles/src/stretch/geometry.rs

@@ -0,0 +1,136 @@
+use core::ops::Add;
+
+use crate::number::Number;
+use crate::styles as style;
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct Rect<T> {
+    pub start: T,
+    pub end: T,
+    pub top: T,
+    pub bottom: T,
+}
+
+impl<T> Rect<T> {
+    pub(crate) fn map<R, F>(self, f: F) -> Rect<R>
+    where
+        F: Fn(T) -> R,
+    {
+        Rect { start: f(self.start), end: f(self.end), top: f(self.top), bottom: f(self.bottom) }
+    }
+}
+
+impl<T> Rect<T>
+where
+    T: Add<Output = T> + Copy + Clone,
+{
+    pub(crate) fn horizontal(&self) -> T {
+        self.start + self.end
+    }
+
+    pub(crate) fn vertical(&self) -> T {
+        self.top + self.bottom
+    }
+
+    pub(crate) fn main(&self, direction: style::FlexDirection) -> T {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.start + self.end,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.top + self.bottom,
+        }
+    }
+
+    pub(crate) fn cross(&self, direction: style::FlexDirection) -> T {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.top + self.bottom,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.start + self.end,
+        }
+    }
+}
+
+impl<T> Rect<T>
+where
+    T: Copy + Clone,
+{
+    pub(crate) fn main_start(&self, direction: style::FlexDirection) -> T {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.start,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.top,
+        }
+    }
+
+    pub(crate) fn main_end(&self, direction: style::FlexDirection) -> T {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.end,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.bottom,
+        }
+    }
+
+    pub(crate) fn cross_start(&self, direction: style::FlexDirection) -> T {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.top,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.start,
+        }
+    }
+
+    pub(crate) fn cross_end(&self, direction: style::FlexDirection) -> T {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.bottom,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.end,
+        }
+    }
+}
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct Size<T> {
+    pub width: T,
+    pub height: T,
+}
+
+impl Size<()> {
+    pub fn undefined() -> Size<Number> {
+        Size { width: Number::Undefined, height: Number::Undefined }
+    }
+}
+
+impl<T> Size<T> {
+    pub(crate) fn map<R, F>(self, f: F) -> Size<R>
+    where
+        F: Fn(T) -> R,
+    {
+        Size { width: f(self.width), height: f(self.height) }
+    }
+
+    pub(crate) fn set_main(&mut self, direction: style::FlexDirection, value: T) {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.width = value,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.height = value,
+        }
+    }
+
+    pub(crate) fn set_cross(&mut self, direction: style::FlexDirection, value: T) {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.height = value,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.width = value,
+        }
+    }
+
+    pub(crate) fn main(self, direction: style::FlexDirection) -> T {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.width,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.height,
+        }
+    }
+
+    pub(crate) fn cross(self, direction: style::FlexDirection) -> T {
+        match direction {
+            style::FlexDirection::Row | style::FlexDirection::RowReverse => self.height,
+            style::FlexDirection::Column | style::FlexDirection::ColumnReverse => self.width,
+        }
+    }
+}
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct Point<T> {
+    pub x: T,
+    pub y: T,
+}